CN114243789A - Microgrid control method and device, microgrid main controller and storage medium - Google Patents
Microgrid control method and device, microgrid main controller and storage medium Download PDFInfo
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- H—ELECTRICITY
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Abstract
The application is applicable to the technical field of micro-grids, and provides a micro-grid control method, a device, a micro-grid main controller and a storage medium, wherein the micro-grid control method comprises the following steps: when the micro-grid is in a grid-connected state and the distributed power supply is in a starting state, acquiring the power generation power of the distributed power supply and the load of the micro-grid; if the generated power of the distributed power supply is not equal to the load of the microgrid, sending a power adjusting instruction to an energy storage converter in the microgrid according to the state of charge of an energy storage battery in the microgrid, wherein the power adjusting instruction is used for indicating the energy storage converter to adjust the total power supplied by the distributed power supply and the energy storage battery; and when the microgrid is in an off-grid state and the distributed power supply is in a starting state, adjusting the power generation power of the distributed power supply according to the charge state of the energy storage battery. According to the scheme, the energy utilization rate of the distributed power supply can be improved by adjusting the power generation power of the distributed power supply in the grid-connected state and the off-grid state.
Description
Technical Field
The application belongs to the technical field of micro-grids, and particularly relates to a micro-grid control method and device, a micro-grid main controller and a storage medium.
Background
The micro-grid is a small-sized Power generation and distribution System formed by collecting a distributed Power supply, an energy storage device, related loads, a monitoring and protection device and a Power Conversion System (PCS), and meanwhile, as a complete Power System, the micro-grid can realize the functions of Power balance control, System operation optimization, fault detection and protection, Power quality management and the like by depending on the control and management functions of the micro-grid, can independently operate off the grid, and can also operate in a grid-connected mode with an external Power grid.
The structure of different micro-grids is largely the same as the structure of the micro-grid, the superiority of the micro-grid mainly depends on the performance of core devices of the micro-grid, such as a micro-grid main controller, a background monitoring device, a distributed power supply grid-connected interface device and the like, and as the most key core device micro-grid main controller, the control strategy of the micro-grid has a decisive role in the superiority of the whole micro-grid, such as whether the energy generated by the distributed power supply can be utilized with the maximum efficiency.
Disclosure of Invention
The embodiment of the application provides a microgrid control method and device, a microgrid main controller and a storage medium, and the energy utilization rate of a distributed power supply can be improved.
A first aspect of an embodiment of the present application provides a microgrid control method, where the microgrid control method includes:
when the micro-grid is in a grid-connected state and the distributed power supply is in a starting state, acquiring the power generation power of the distributed power supply and the load of the micro-grid;
if the generated power of the distributed power supply is not equal to the load of the microgrid, sending a power adjusting instruction to an energy storage converter in the microgrid according to the state of charge of an energy storage battery in the microgrid, wherein the power adjusting instruction is used for indicating the energy storage converter to adjust the total power supplied by the distributed power supply and the energy storage battery so as to enable the microgrid to be in a power balance state, and the power balance state refers to a state that the total power is balanced with the load of the microgrid;
and when the micro-grid is in an off-grid state and the distributed power supply is in a starting state, adjusting the generating power of the distributed power supply according to the charge state of the energy storage battery.
Optionally, before the microgrid is in a grid-connected state, the method further includes:
acquiring a grid-connected signal of the microgrid, and sending a grid-connected instruction to the energy storage converter according to the grid-connected signal, wherein the grid-connected instruction is used for indicating the energy storage converter to judge whether the microgrid and an external power grid meet a synchronization condition or not, and returning a judgment result of the synchronization condition, and the synchronization condition refers to that the voltage, the frequency and the phase position of two sides of a switch connected with the microgrid and the external power grid are in a synchronous state;
if the judgment result indicates that the microgrid and the external power grid meet the synchronous condition, determining that the microgrid is in a grid-connected state;
and if the judgment result indicates that the microgrid and the external power grid do not meet the synchronization condition, determining that the microgrid is in an off-grid state.
Optionally, if the generated power of the distributed power source is not equal to the load of the microgrid, sending a power adjustment instruction to the energy storage converter according to the state of charge of an energy storage battery in the microgrid includes:
if the generated power of the distributed power supply is larger than the load of the microgrid and the state of charge of the energy storage battery is lower than a first preset percentage, sending a charging instruction to the energy storage converter, wherein the charging instruction is used for indicating the energy storage converter to charge the energy storage battery;
if the generated power of the distributed power supply is larger than the load of the microgrid and the state of charge of the energy storage battery is higher than or equal to a first preset percentage, sending a power output instruction to the energy storage converter, wherein the power output instruction is used for indicating the energy storage converter to output the generated power to target electric equipment according to the electricity utilization priority;
if the power generation power of the distributed power supply is smaller than the load of the microgrid and the state of charge of the energy storage battery is higher than or equal to a second preset percentage, sending a discharging instruction to the energy storage converter, wherein the discharging instruction is used for indicating the energy storage converter to discharge the energy storage battery;
and if the generated power of the distributed power supply is smaller than the load of the external power grid and the state of charge of the energy storage battery is lower than a third preset percentage, sending the charging instruction to the energy storage converter, wherein the third preset percentage is smaller than a second preset percentage.
Optionally, the microgrid control method further comprises:
when the micro-grid is in a grid-connected state, if the fact that the power generation power of the distributed power supply is larger than preset power is detected, the micro-grid is switched from the grid-connected state to an off-grid state.
Optionally, if it is detected that the generated power of the distributed power supply is greater than a preset power, switching the microgrid from a grid-connected state to an off-grid state includes:
if the generated power of the distributed power supply is detected to be larger than the preset power, adjusting the generated power of the distributed power supply to be zero;
after the time length for adjusting the generating power of the distributed power supply to be zero reaches a preset time length, sending a power recovery instruction to the distributed power supply, wherein the power recovery instruction is used for indicating the distributed power supply to recover a full-power generating state;
and if the generated power of the distributed power supply after power recovery is greater than the preset power, sending an off-grid instruction to the energy storage converter so as to switch the micro-grid from a grid-connected state to an off-grid state.
Optionally, the adjusting the generated power of the distributed power source according to the state of charge of the energy storage battery includes:
if the state of charge of the energy storage battery is higher than or equal to a fourth preset percentage, reducing the generating power of the distributed power supply;
and if the state of charge of the energy storage battery is lower than a fifth preset percentage, adjusting the distributed power supply to perform full-power generation.
Optionally, if the state of charge of the energy storage battery is greater than or equal to a fourth preset percentage, reducing the generated power of the distributed power supply includes:
and when the working time is night time, if the state of charge of the energy storage battery is greater than or equal to a fourth preset percentage, reducing the generating power of the distributed power supply to zero.
A second aspect of an embodiment of the present application provides a microgrid control device, including:
the acquisition module is used for acquiring the power generation power of the distributed power supply and the load of the microgrid when the microgrid is in a grid-connected state and the distributed power supply is in a starting state;
the first power adjusting module is used for sending a power adjusting instruction to an energy storage converter in the microgrid according to the state of charge of an energy storage battery in the microgrid if the generated power of the distributed power supply is not equal to the load of the microgrid, wherein the power adjusting instruction is used for instructing the energy storage converter to adjust the total power supplied by the distributed power supply and the energy storage battery so as to enable the microgrid to be in a power balance state, and the power balance state is a state that the total power and the load of the microgrid are kept in balance;
and the second power regulating module is used for regulating the generating power of the distributed power supply according to the charge state of the energy storage battery when the micro-grid is in an off-grid state and the distributed power supply is in a starting state.
A third aspect of an embodiment of the present application provides a microgrid master controller, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the microgrid control method according to the first aspect when executing the computer program.
A fourth aspect of embodiments of the present application provides a computer-readable storage medium, where a computer program is stored, and the computer program, when executed by a processor, implements the microgrid control method according to the first aspect.
A fifth aspect of embodiments of the present application provides a computer program product, which when run on a microgrid main controller causes the microgrid main controller to execute the microgrid control method according to the first aspect described above.
Compared with the prior art, the embodiment of the application has the advantages that: according to the method and the device, when the micro-grid is in a grid-connected state and the distributed power supply is in a starting state, firstly, the power generation power of the distributed power supply and the load of the micro-grid are obtained; secondly, if the generated power of the distributed power supply is not equal to the load of the microgrid, sending a power adjusting instruction to the energy storage converter according to the charge state of an energy storage battery in the microgrid so as to adjust the microgrid and the microgrid to be in a balanced state, wherein the power adjusting instruction is used for indicating the energy storage converter to adjust the total power supplied by the distributed power supply and the energy storage battery, so that the maximization of the energy utilization rate of the distributed power supply in a grid-connected state can be ensured; according to the embodiment of the application, when the microgrid is in an off-grid state, the power generation power of the distributed power supply is adjusted according to the charge state of the energy storage battery, so that the maximization of the energy utilization rate of the distributed power supply in the off-grid state is ensured. According to the scheme, the energy utilization rate of the distributed power supply can be improved by adjusting the power generation power of the distributed power supply in the grid-connected state and the off-grid state.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic flowchart of a microgrid control method according to an embodiment of the present application;
FIG. 2 is a diagram of the interaction of the microgrid with consumer electrical equipment and an external power grid;
fig. 3 is a schematic flowchart of a microgrid control method according to a second embodiment of the present application;
fig. 4 is a schematic structural diagram of a microgrid control device according to a third embodiment of the present application;
fig. 5 is a schematic structural diagram of a microgrid master controller according to a fourth embodiment of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
As used in this specification and the appended claims, the term "if" may be interpreted contextually as "when", "upon" or "in response to" determining "or" in response to detecting ". Similarly, the phrase "if it is determined" or "if a [ described condition or event ] is detected" may be interpreted contextually to mean "upon determining" or "in response to determining" or "upon detecting [ described condition or event ]" or "in response to detecting [ described condition or event ]".
Furthermore, in the description of the present application and the appended claims, the terms "first," "second," "third," and the like are used for distinguishing between descriptions and not necessarily for describing or implying relative importance.
Reference throughout this specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise.
The micro-grid is a small power generation and distribution system formed by collecting a distributed power supply, an energy storage device, a PCS (power distribution system), related loads, a monitoring device and a protection device. The power supply in the micro-grid is mostly a distributed power supply with small capacity, namely a small unit with a power electronic interface, and comprises energy storage batteries such as a fuel cell, a photovoltaic cell and a storage battery. They are connected to user side, and have the characteristics of low cost, low voltage, small pollution and the like.
However, due to the double pressure of environmental protection and energy exhaustion, renewable new energy becomes a new energy development direction, and therefore the development of the micro-grid has great potential and benefit. In the development of the microgrid, requirements for improving power supply reliability and power supply quality and various constraints brought by long-distance power transmission promote that corresponding power supplies are set near a load center, if each corresponding power supply corresponds to one local controller, the complexity of the microgrid is aggravated, and the realization is difficult, so in practical application, the centralized control of the whole microgrid is usually realized through a microgrid main controller, a distributed local controller is not needed, and a control strategy of a main controller of the microgrid plays a decisive role in the superiority of the whole microgrid, for example: the method plays a decisive role in the energy utilization rate in the micro-grid.
Therefore, in order to improve the energy utilization rate of the distributed power supply in the microgrid, the microgrid control method is provided, and the generation power of the distributed power supply and the load of the microgrid can be obtained when the microgrid is in a grid-connected state and the distributed power supply is in a starting state; then when the power generation power of the distributed power supply is not equal to the load of the microgrid, a power adjusting instruction is sent to the energy storage converter according to the charge state of an energy storage battery in the microgrid so as to adjust the microgrid and the microgrid to be in a balanced state, and the power adjusting instruction is used for indicating the energy storage converter to adjust the total power supplied by the distributed power supply and the energy storage battery, so that the maximization of the energy utilization rate of the distributed power supply in a grid-connected state can be ensured; according to the embodiment of the application, when the microgrid is in an off-grid state, the power generation power of the distributed power supply is adjusted according to the charge state of the energy storage battery, so that the maximization of the energy utilization rate of the distributed power supply in the off-grid state is ensured. The energy utilization rate of the distributed power supply is improved by adjusting the power generation power of the distributed power supply in the grid-connected state and the off-grid state.
It should be understood that, the sequence numbers of the steps in this embodiment do not mean the execution sequence, and the execution sequence of each process should be determined by the function and the inherent logic of the process, and should not constitute any limitation to the implementation process of the embodiment of the present application.
In order to explain the technical solution of the present application, the following description is given by way of specific examples.
Referring to fig. 1, a schematic flowchart of a microgrid control method provided in an embodiment of the present application is shown, where the microgrid control method may be applied to a main controller of a microgrid. As shown in fig. 1, the microgrid control method may include the following steps:
The micro-grid is in a grid-connected state, namely a grid-connected switch of the micro-grid is in a switch-on state, the micro-grid can be connected with an external power grid through the grid-connected switch, the external power grid is a power grid comprising three units of power transformation, power transmission and power distribution, the external power grid is a large-scale power generation and distribution system relative to the range of the micro-grid, and the micro-grid is a small-scale power generation and distribution system formed by collecting a distributed power supply, an energy storage battery, a PCS (power distribution system), related loads, a monitoring device and a protection device; the distributed power supply can comprise new energy power generation devices such as a wind power generation device (namely a fan), a photovoltaic power generation device and the like; the load of the microgrid may refer to power generated by the operation of the load within the microgrid.
In the embodiment of the application, when the microgrid is in a grid-connected state, whether the distributed power supply is in a power-on state or not is detected, if the distributed power supply is in the power-off state, a power-on instruction is sent to the distributed power supply, so that the distributed power supply can be powered on for power generation, and after the distributed power supply is powered on, the microgrid main controller can obtain the power generation power of the distributed power supply and the power generated by load operation in the microgrid.
In a possible embodiment, before the microgrid is in a grid-connected state, the method further comprises the following steps:
acquiring a grid-connected signal of the microgrid, and sending a grid-connected instruction to the energy storage converter according to the grid-connected signal, wherein the grid-connected instruction is used for indicating the energy storage converter to judge whether the microgrid and an external power grid meet a synchronization condition or not, and returning a judgment result of the synchronization condition, and the synchronization condition refers to that the voltage, the frequency and the phase position of two sides of a switch connected with the microgrid and the external power grid are in a synchronous state;
if the judgment result indicates that the microgrid and the external power grid meet the synchronization condition, determining that the microgrid is in a grid-connected state;
and if the judgment result indicates that the microgrid and the external power grid do not meet the synchronization condition, determining that the microgrid is in an off-grid state.
In the embodiment of the application, the microgrid may be in an off-grid operation state before being in a grid-connected state, when the off-grid operation state is reached, a grid-connected switch of the microgrid is turned on, when the grid-connected switch is in a closed state, an electrical signal (i.e. a grid-connected signal) is generated, when the microgrid main controller obtains the grid-connected signal, since a thyristor in the intelligent grid-connected cabinet as shown in fig. 2 is still in an open state, and only when the thyristor of the intelligent grid-connected cabinet is in the closed state, the microgrid main controller can be converted from the off-grid state to the grid-connected state, after obtaining the grid-connected signal, the microgrid main controller should send a grid-connected instruction to the PCS, and after receiving the grid-connected instruction, the PCS starts to detect a synchronization (i.e. judges whether the microgrid and an external power grid meet a synchronization condition), and if the synchronization condition is met, the microgrid main controller sends the closing instruction to the intelligent grid-connected cabinet, and the thyristor in the intelligent grid-connected cabinet is in a closing state, and the micro-grid is successfully converted from an off-grid state to a grid-connected state at the moment.
It should be understood that, the above-mentioned microgrid is converted from an off-grid state to a grid-connected state, and the method is applicable to any operating time of the microgrid, and the method is not limited in this application.
And 102, if the generated power of the distributed power supply is not equal to the load of the microgrid, sending a power adjusting instruction to an energy storage converter in the microgrid according to the charge state of an energy storage battery in the microgrid.
In the embodiment of the application, when the microgrid is in a grid-connected state, the generated power of the distributed power supply can firstly ensure the operation of the microgrid, then on the basis of ensuring the normal operation of the microgrid, the surplus generated power generated by the distributed power supply is considered to be distributed and output, the generated power of the distributed power supply can ensure the normal operation of the microgrid, namely the generated power of the distributed power supply is equal to the power required by the load operation in the microgrid, if the generated power of the distributed power supply is not equal to the power required by the load operation in the microgrid, a power regulation instruction is sent to the PCS, the PCS regulates the total power which can be supplied by the distributed power supply and the energy storage battery according to the power regulation instruction, so that the total power which can be supplied and the power required by the load operation in the microgrid are balanced, and the microgrid is further in a power balance state, under the condition of not limiting the generated power of the distributed power supply, the utilization rate of the generated power of the distributed power supply is improved.
In one possible embodiment, if the generated power of the distributed power source is not equal to the load of the microgrid, sending a power adjustment instruction to the energy storage converter according to the state of charge of the energy storage battery in the microgrid comprises:
if the generated power of the distributed power supply is larger than the load of the microgrid and the state of charge of the energy storage battery is lower than a first preset percentage, sending a charging instruction to the energy storage converter, wherein the charging instruction is used for indicating the energy storage converter to charge the energy storage battery;
if the generated power of the distributed power supply is larger than the load of the microgrid and the state of charge of the energy storage battery is higher than or equal to a first preset percentage, sending a power output instruction to the energy storage converter, wherein the power output instruction is used for indicating the energy storage converter to output the generated power to the target power utilization equipment according to the power utilization priority;
if the generated power of the distributed power supply is smaller than the load of the microgrid and the state of charge of the energy storage battery is higher than or equal to a second preset percentage, sending a discharging instruction to the energy storage converter, wherein the discharging instruction is used for indicating the energy storage converter to discharge the energy storage battery;
and if the generated power of the distributed power supply is smaller than the load of the external power grid and the state of charge of the energy storage battery is lower than a third preset percentage, sending a charging instruction to the energy storage converter, wherein the third preset percentage is smaller than the second preset percentage.
In this embodiment of the application, the PCS adjusting the power according to the power adjustment instruction may specifically be: firstly, judging whether the power generation power of a distributed power supply is greater than the load of a microgrid, if so, indicating that the distributed power supply generates redundant power generation power, in order to not waste the redundant power generation power and improve the energy utilization rate of the distributed power supply, judging the charge state of an energy storage battery at the current moment, if the charge state of the energy storage battery is lower than a first preset percentage, indicating that the residual charge in the energy storage battery is insufficient and charging is needed, and at the moment, sending a charging instruction to a PCS (personal computer system) by a main controller of the microgrid, and charging the energy storage battery by the PCS according to the charging instruction; if the state of charge of the energy storage battery is higher than the first preset percentage, the situation that the residual charge in the energy storage battery is sufficient and charging is not needed is indicated, at the moment, a micro-grid main controller can send a power output instruction to a PCS (power conversion system), and the PCS outputs redundant generating power to target power utilization equipment according to the power output instruction and the power utilization priority.
The target electric equipment may refer to an external power grid and user electric equipment as shown in fig. 2, if the power utilization priority of the external power grid is higher than the power utilization priority of the user electric equipment, the PCS outputs the redundant generated power to the external power grid according to the power output instruction, and if the power utilization priority of the user electric equipment is higher than the priority of the external power grid, the PCS outputs the redundant generated power to the user electric equipment according to the power output instruction.
It should be understood that the PCS may charge the energy storage Battery according to the charging command through the Battery Management device in fig. 2, wherein the Battery Management device refers to a device for intelligently managing and maintaining each Battery unit, preventing the Battery from being overcharged and overdischarged, prolonging the service life of the Battery, and monitoring the Battery state, such as a Battery Management System (BMS), and may acquire the state of charge of the energy storage Battery through the BMS and control the energy storage Battery to be charged and discharged through the BMS.
It should be further understood that, as shown in the interaction structure diagram of the microgrid with the consumer electrical equipment and the external power grid in fig. 2, it can be obtained that the microgrid performs power interaction with the consumer electrical equipment and the external power grid through the PCS, and when the microgrid is in a grid-connected state, the microgrid is connected with the external power grid through the intelligent grid-connected cabinet.
Exemplarily, the first preset percentage in the embodiment of the present application may be 70%, that is, the state of charge of the energy storage battery is lower than 70%, and it is determined that the energy storage battery needs to be charged; the state of charge of the energy storage battery is higher than or equal to 70%, the energy storage battery does not need to be charged, and redundant generated power can be sequentially output to an external power grid and user power equipment according to the power utilization priority.
In this embodiment of the application, the PCS adjusting the power according to the power adjustment instruction may specifically be further: if the power generation power of the distributed power supply is smaller than the load of the microgrid, it is indicated that the power generation power generated by the distributed power supply is not enough to support the normal operation of the microgrid, in order to ensure the normal operation of the microgrid, the state of charge of an energy storage battery at the current moment can be judged, if the state of charge of the energy storage battery is higher than or equal to a second preset percentage, it is indicated that the residual charge in the energy storage battery is sufficient, and the power required by the operation can be provided for the microgrid, wherein the second preset percentage can be equal to the first preset percentage or not, at this time, a discharge instruction can be sent to the PCS by the microgrid main controller, and the BMS is controlled by the PC S to discharge the energy storage battery according to the discharge instruction; if the state of charge of the energy storage battery is lower than a third preset percentage, it is indicated that the remaining charge in the energy storage battery is insufficient, the power required for operation cannot be provided for the microgrid, and the power needs to be transmitted to the microgrid by means of an external power grid to ensure that the microgrid is in a power balance state.
It should be understood that the third preset percentage should be less than the second preset percentage, the second preset percentage may be 70% and the third preset percentage may be 40%, and the above values are examples, and the second preset percentage and the third preset percentage may be configured according to the actual situation of the microgrid when the third preset percentage should be less than the second preset percentage, and the specific values of the second preset percentage and the third preset percentage are not limited in the present application.
It should also be understood that the PCS should limit the charging and discharging power to 60kw when controlling the BMS to perform the charging and discharging operation, preventing the overcharge and overdischarge from occurring.
And 103, when the microgrid is in an off-grid state and the distributed power supply is in a starting state, adjusting the power generation power of the distributed power supply according to the charge state of the energy storage battery.
In this embodiment of the application, when the microgrid is in an off-grid state, the PCS directly supplies power to the user electrical equipment, that is, the power transmitted by the PCS is directly supplied to the user, and at this time, the power of the PCS is not controlled by the main controller of the microgrid, so that when the microgrid is in the off-grid state and the distributed power supply is in a power-on state, the power generation power of the distributed power supply needs to be adjusted according to the charge state of the energy storage battery, so as to improve the energy utilization rate of the distributed power supply.
In one possible embodiment, adjusting the generated power of the distributed power source according to the state of charge of the energy storage battery comprises:
if the state of charge of the energy storage battery is higher than or equal to a fourth preset percentage, reducing the generating power of the distributed power supply;
and if the state of charge of the energy storage battery is lower than a fifth preset percentage, adjusting the distributed power supply to perform full-power generation.
The fourth preset percentage is generally an upper limit that the energy storage battery can bear charges, and may be, for example, 90%, and the fifth preset percentage is generally a lower limit that the energy storage battery can maintain charges required for normal operation, and may be, for example, 10%.
For example, if the state of charge of the energy storage battery is higher than or equal to 90%, it is determined that the charge that the energy storage battery can carry has reached the upper limit and cannot receive the generated power of the distributed power source, so the generated power of the distributed power source should be reduced (i.e., the generated power of the distributed power source is limited), and the reduced generated power of the distributed power source should be balanced with the power required for the load operation in the microgrid.
For example, if the state of charge of the energy storage battery is lower than 10%, it is determined that the charge required to ensure normal operation of the energy storage battery has reached a lower limit, at this time, the distributed power source should be adjusted to perform full power generation (i.e., the limit of the power generation power of the distributed power source is removed), and the power generation power generated by the full power generation of the distributed power source is input into the energy storage battery to ensure normal operation of the energy storage battery.
It should be understood that when the operating time of the microgrid is daytime, if the state of charge of the energy storage battery is higher than or equal to a fourth preset percentage, the generated power of the distributed power supply is reduced, so that the reduced generated power of the distributed power supply should be balanced with the power required by load operation in the microgrid. If the working time of the microgrid is nighttime and the state of charge of the energy storage battery is higher than or equal to a fourth preset percentage, the generated power of the distributed power supply is reduced to zero, and dangers are avoided under the condition of unmanned monitoring.
It should also be understood that when the working time of the microgrid is daytime and the distributed power sources are photovoltaic power generation devices and wind power generation devices, both the photovoltaic power generation devices and the wind power generation devices can generate power, and therefore, reducing the power generation power of the distributed power sources should reduce the power generation power of the photovoltaic power generation devices and the wind power generation devices. And when the working time of the microgrid is night time, the photovoltaic power generation device does not generate power, and at the moment, the generated power of the distributed power supply is reduced by reducing the generated power of the wind power generation device.
In the embodiment of the application, when the microgrid is in a grid-connected state and the distributed power supply is in a starting state, firstly, the power generation power of the distributed power supply and the load of the microgrid are obtained; secondly, if the generated power of the distributed power supply is not equal to the load of the microgrid, sending a power adjusting instruction to the energy storage converter according to the charge state of an energy storage battery in the microgrid so as to adjust the microgrid and the microgrid to be in a balanced state, wherein the power adjusting instruction is used for indicating the energy storage converter to adjust the total power supplied by the distributed power supply and the energy storage battery, so that the maximization of the energy utilization rate of the distributed power supply in a grid-connected state can be ensured; according to the embodiment of the application, when the microgrid is in an off-grid state, the power generation power of the distributed power supply is adjusted according to the charge state of the energy storage battery, so that the maximization of the energy utilization rate of the distributed power supply in the off-grid state is ensured. According to the scheme, the energy utilization rate of the distributed power supply can be improved by adjusting the power generation power of the distributed power supply in the grid-connected state and the off-grid state.
Referring to fig. 3, a schematic flow diagram of a microgrid control method provided in the second embodiment of the present application is shown. As shown in fig. 3, the microgrid control method may include the following steps:
And step 302, if the generated power of the distributed power supply is not equal to the load of the microgrid, sending a power adjusting instruction to an energy storage converter in the microgrid according to the charge state of an energy storage battery in the microgrid.
The steps 301-302 of this embodiment are the same as the steps 101-102 of the previous embodiment, and reference may be made to these steps, which are not described herein again.
And 303, when the microgrid is in a grid-connected state, if the generated power of the distributed power supply is detected to be greater than the preset power, switching the microgrid from the grid-connected state to an off-grid state.
In this embodiment of the application, the preset power may refer to a maximum power that an external power grid can bear, and for example, when a value is 10 kilowatts, when it is detected that the generated power of the distributed power supply is greater than the preset power, the microgrid needs to be switched from a grid-connected state to an off-grid state, so as to reduce loss to the external power grid.
In a possible embodiment, the specific process of switching the microgrid from a grid-connected state to an off-grid state may include:
if the generated power of the distributed power supply is detected to be larger than the preset power, the generated power of the distributed power supply is adjusted to be zero;
after the time length for adjusting the generating power of the distributed power supply to be zero reaches a preset time length, sending a power recovery instruction to the distributed power supply;
and if the generated power of the distributed power supply after the power recovery is greater than the preset power, sending an off-grid instruction to the energy storage converter so as to switch the micro-grid from a grid-connected state to an off-grid state.
And the power recovery instruction is used for indicating the distributed power supply to recover the full-power generation state.
In the embodiment of the application, when the power generation power of the distributed power supply is detected to be larger than the preset power, the power generation power of the distributed power supply can be limited to zero at first, if the power generation power of the distributed power supply is not limited to zero, the distributed power supply continues to generate power in the switching process of grid connection and grid disconnection, the voltage of the grid disconnection can be increased instantly, and at the moment, the PCS can report hardware overvoltage and damage hardware. And then limiting the generated power to be 60 seconds after zero (namely, the preset time length, wherein the preset time length can also be other values), sending a power recovery instruction to the distributed power supply to enable the distributed power supply to recover a full-power generation state, if the generated power of the distributed power supply after power recovery is greater than the preset power, sending an off-grid instruction to the PCS, disconnecting a thyristor in the intelligent grid-connected cabinet by the PCS according to the off-grid instruction, and disconnecting a grid-connected switch after disconnecting the thyristor to enable the microgrid to enter the off-grid state to complete switching from the grid-connected state to the off-grid state.
And 304, when the microgrid is in an off-grid state and the distributed power supply is in a starting state, adjusting the power generation power of the distributed power supply according to the charge state of the energy storage battery.
Step 304 of this embodiment is the same as step 103 of the previous embodiment, and may refer to each other, which is not described herein again.
Compared with the first embodiment, the implementation method for switching the microgrid from the grid-connected state to the off-grid state is added, and specifically, when the microgrid is in the grid-connected state, the magnitude relation between the generating power of the distributed power supply and the preset power is detected.
Referring to fig. 4, a schematic structural diagram of a microgrid control device according to a third embodiment of the present application is shown, and for convenience of description, only portions related to the third embodiment of the present application are shown.
The microgrid control device may specifically include the following modules:
the acquiring module 401 is configured to acquire the power generation power of the distributed power supply and the load of the microgrid when the microgrid is in a grid-connected state and the distributed power supply is in a power-on state;
the first power adjusting module 402 is configured to send a power adjusting instruction to an energy storage converter in the microgrid according to a state of charge of an energy storage battery in the microgrid if the generated power of the distributed power source is not equal to the load of the microgrid, where the power adjusting instruction is used to instruct the energy storage converter to adjust the total power supplied by the distributed power source and the energy storage battery so as to enable the microgrid to be in a power balance state, and the power balance state is a state where the total power is balanced with the load of the microgrid;
and a second power adjusting module 403, configured to adjust the power generation power of the distributed power source according to the state of charge of the energy storage battery when the microgrid is in an off-grid state and the distributed power source is in a power-on state.
In this embodiment of the application, the microgrid control device may further include the following modules:
the grid-connected instruction sending module is used for acquiring a grid-connected signal of the microgrid and sending a grid-connected instruction to the energy storage converter according to the grid-connected signal, wherein the grid-connected instruction is used for indicating the energy storage converter to judge whether the microgrid and an external power grid meet a synchronization condition or not and returning a judgment result of the synchronization condition, and the synchronization condition refers to that the voltage, the frequency and the phase position of two sides of a switch connected with the microgrid and the external power grid are in a synchronous state;
the first state determination module is used for determining that the microgrid is in a grid-connected state if the judgment result indicates that the microgrid and an external power grid meet the synchronization condition;
and the second state determination module is used for determining that the microgrid is in an off-grid state if the judgment result indicates that the microgrid and the external power grid do not meet the synchronization condition.
In this embodiment of the application, the first power adjusting module 402 may further include the following sub-modules:
the first instruction sending submodule is used for sending a charging instruction to the energy storage converter if the power generation power of the distributed power supply is larger than the load of the microgrid and the state of charge of the energy storage battery is lower than a first preset percentage, and the charging instruction is used for indicating the energy storage converter to charge the energy storage battery;
the second instruction sending submodule is used for sending a power output instruction to the energy storage converter if the generated power of the distributed power supply is larger than the load of the micro-grid and the state of charge of the energy storage battery is higher than or equal to a first preset percentage, and the power output instruction is used for indicating the energy storage converter to output the generated power to the target electric equipment according to the power utilization priority;
the third instruction sending submodule is used for sending a discharging instruction to the energy storage converter if the power generation power of the distributed power supply is smaller than the load of the microgrid and the state of charge of the energy storage battery is higher than or equal to a second preset percentage, and the discharging instruction is used for indicating the energy storage converter to discharge the energy storage battery;
and the fourth instruction sending submodule is used for sending a charging instruction to the energy storage converter if the power generation power of the distributed power supply is smaller than the load of an external power grid and the state of charge of the energy storage battery is lower than a third preset percentage, and the third preset percentage is smaller than the second preset percentage.
In this embodiment of the application, the microgrid control device may further include the following modules:
and the state switching module is used for switching the microgrid from a grid-connected state to an off-grid state if the generated power of the distributed power supply is detected to be greater than the preset power when the microgrid is in the grid-connected state.
In this embodiment, the state switching module may specifically include the following sub-modules:
the adjusting submodule is used for adjusting the generating power of the distributed power supply to be zero if the generating power of the distributed power supply is detected to be larger than the preset power;
the recovery instruction sending submodule is used for sending a power recovery instruction to the distributed power supply after the time length for adjusting the power generation power of the distributed power supply to be zero reaches a preset time length, and the power recovery instruction is used for indicating the distributed power supply to recover the full-power generation state;
and the off-grid instruction sending submodule is used for sending an off-grid instruction to the energy storage converter if the generated power of the distributed power supply after power recovery is greater than the preset power so as to switch the micro-grid from a grid-connected state to an off-grid state.
In this embodiment, the second power adjusting module 403 may further include the following sub-modules:
the power reduction submodule is used for reducing the generating power of the distributed power supply if the state of charge of the energy storage battery is higher than or equal to a fourth preset percentage;
and the full-power generation submodule is used for adjusting the distributed power supply to perform full-power generation if the state of charge of the energy storage battery is lower than a fifth preset percentage.
In this embodiment, the power reduction sub-module may further include the following units:
and the night adjusting module is used for reducing the generating power of the distributed power supply to zero if the charge state of the energy storage battery is greater than or equal to a fourth preset percentage when the working time of the micro-grid is night time.
The microgrid control device provided in the embodiment of the present application may be applied to the foregoing method embodiments, and for details, reference is made to the description of the foregoing method embodiments, and details are not described herein again.
Fig. 5 is a schematic structural diagram of a microgrid master controller according to a fourth embodiment of the present application. As shown in fig. 5, the microgrid master controller 500 of the embodiment includes: at least one processor 510 (only one is shown in fig. 5), a memory 520, and a computer program 521 stored in the memory 520 and executable on the at least one processor 510, wherein the processor 510 executes the computer program 521 to implement the steps in the microgrid control method embodiments described above.
The microgrid master controller 500 may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The microgrid master controller may include, but is not limited to, a processor 510 and a memory 520. Those skilled in the art will appreciate that fig. 5 is merely an example of the microgrid master controller 500 and does not constitute a limitation on the microgrid master controller 500, and may include more or fewer components than those shown, or some components in combination, or different components, such as input and output devices, network access devices, etc.
The Processor 510 may be a Central Processing Unit (CPU), and the Processor 510 may be other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage 520 may be an internal storage unit of the microgrid master controller 500 in some embodiments, for example, a hard disk or a memory of the microgrid master controller 500. The memory 520 may also be an external storage device of the microgrid master controller 500 in other embodiments, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, provided on the microgrid master controller 500. Further, the memory 520 may also include both an internal storage unit and an external storage device of the microgrid master controller 500. The memory 520 is used for storing an operating system, an application program, a Boot Loader (Boot Loader), data, and other programs, such as program codes of the computer programs. The memory 520 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus/microgrid master controller and method may be implemented in other ways. For example, the above-described device/microgrid master controller embodiment is merely illustrative, and for example, the division of the modules or units is only one logical functional division, and there may be other divisions when actually implemented, for example, multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method of the embodiments described above can be realized by a computer program, which can be stored in a computer-readable storage medium and can realize the steps of the embodiments of the methods described above when the computer program is executed by a processor. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
When the computer program product runs on the microgrid master controller, the microgrid master controller can implement the steps in the method embodiments.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A microgrid control method is characterized by comprising the following steps:
when the micro-grid is in a grid-connected state and the distributed power supply is in a starting state, acquiring the power generation power of the distributed power supply and the load of the micro-grid;
if the generated power of the distributed power supply is not equal to the load of the microgrid, sending a power adjusting instruction to an energy storage converter in the microgrid according to the state of charge of an energy storage battery in the microgrid, wherein the power adjusting instruction is used for indicating the energy storage converter to adjust the total power supplied by the distributed power supply and the energy storage battery so as to enable the microgrid to be in a power balance state, and the power balance state refers to a state that the total power is balanced with the load of the microgrid;
and when the micro-grid is in an off-grid state and the distributed power supply is in a starting state, adjusting the generating power of the distributed power supply according to the charge state of the energy storage battery.
2. The microgrid control method of claim 1, further comprising, before the microgrid is in a grid-connected state:
acquiring a grid-connected signal of the microgrid, and sending a grid-connected instruction to the energy storage converter according to the grid-connected signal, wherein the grid-connected instruction is used for indicating the energy storage converter to judge whether the microgrid and an external power grid meet a synchronization condition or not, and returning a judgment result of the synchronization condition, and the synchronization condition refers to that the voltage, the frequency and the phase position of two sides of a switch connected with the microgrid and the external power grid are in a synchronous state;
if the judgment result indicates that the microgrid and the external power grid meet the synchronous condition, determining that the microgrid is in a grid-connected state;
and if the judgment result indicates that the microgrid and the external power grid do not meet the synchronization condition, determining that the microgrid is in an off-grid state.
3. The microgrid control method according to claim 1, wherein the sending a power adjustment command to an energy storage converter according to a state of charge of an energy storage battery in the microgrid if the generated power of the distributed power source is not equal to the load of the microgrid comprises:
if the generated power of the distributed power supply is larger than the load of the microgrid and the state of charge of the energy storage battery is lower than a first preset percentage, sending a charging instruction to the energy storage converter, wherein the charging instruction is used for indicating the energy storage converter to charge the energy storage battery;
if the generated power of the distributed power supply is larger than the load of the microgrid and the state of charge of the energy storage battery is higher than or equal to a first preset percentage, sending a power output instruction to the energy storage converter, wherein the power output instruction is used for indicating the energy storage converter to output the generated power to target electric equipment according to the electricity utilization priority;
if the power generation power of the distributed power supply is smaller than the load of the microgrid and the state of charge of the energy storage battery is higher than or equal to a second preset percentage, sending a discharging instruction to the energy storage converter, wherein the discharging instruction is used for indicating the energy storage converter to discharge the energy storage battery;
and if the power generation power of the distributed power supply is smaller than the load of the micro-grid and the state of charge of the energy storage battery is lower than a third preset percentage, sending the charging instruction to the energy storage converter, wherein the third preset percentage is smaller than the second preset percentage.
4. The microgrid control method of claim 1, further comprising:
when the micro-grid is in a grid-connected state, if the fact that the power generation power of the distributed power supply is larger than preset power is detected, the micro-grid is switched from the grid-connected state to an off-grid state.
5. The microgrid control method of claim 4, wherein the step of switching the microgrid from a grid-connected state to an off-grid state if the generated power of the distributed power sources is detected to be greater than a preset power comprises:
if the generated power of the distributed power supply is detected to be larger than the preset power, adjusting the generated power of the distributed power supply to be zero;
after the time length for adjusting the generating power of the distributed power supply to be zero reaches a preset time length, sending a power recovery instruction to the distributed power supply, wherein the power recovery instruction is used for indicating the distributed power supply to recover a full-power generating state;
and if the generated power of the distributed power supply after power recovery is greater than the preset power, sending an off-grid instruction to the energy storage converter so as to switch the micro-grid from a grid-connected state to an off-grid state.
6. The microgrid control method of claim 1, wherein the adjusting the generated power of the distributed power sources according to the state of charge of the energy storage cells comprises:
if the state of charge of the energy storage battery is higher than or equal to a fourth preset percentage, reducing the generating power of the distributed power supply;
and if the state of charge of the energy storage battery is lower than a fifth preset percentage, adjusting the distributed power supply to perform full-power generation.
7. The microgrid control method of claim 6, wherein the reducing the generated power of the distributed power sources if the state of charge of the energy storage batteries is greater than or equal to a fourth preset percentage comprises:
and when the working time of the microgrid is night time, if the state of charge of the energy storage battery is greater than or equal to a fourth preset percentage, reducing the generating power of the distributed power supply to zero.
8. A microgrid control apparatus, characterized in that the microgrid control apparatus comprises:
the acquisition module is used for acquiring the power generation power of the distributed power supply and the load of the microgrid when the microgrid is in a grid-connected state and the distributed power supply is in a starting state;
the first power adjusting module is used for sending a power adjusting instruction to an energy storage converter in the microgrid according to the state of charge of an energy storage battery in the microgrid if the generated power of the distributed power supply is not equal to the load of the microgrid, wherein the power adjusting instruction is used for instructing the energy storage converter to adjust the total power supplied by the distributed power supply and the energy storage battery so as to enable the microgrid to be in a power balance state, and the power balance state is a state that the total power and the load of the microgrid are kept in balance;
and the second power regulating module is used for regulating the generating power of the distributed power supply according to the charge state of the energy storage battery when the micro-grid is in an off-grid state and the distributed power supply is in a starting state.
9. A microgrid master controller comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the method according to any of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1 to 7.
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| CN117996810A (en) * | 2024-01-23 | 2024-05-07 | 深圳市质点能源科技有限公司 | Micro-grid power supply control method, device and storage medium |
| CN117639023A (en) * | 2024-01-26 | 2024-03-01 | 深圳市健网科技有限公司 | Automatic off-grid switching control method for distributed energy storage system |
| CN117639023B (en) * | 2024-01-26 | 2024-04-05 | 深圳市健网科技有限公司 | Automatic off-grid switching control method for distributed energy storage system |
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