CN111756045B - Three-in-one power electronic compensation transformer substation - Google Patents
Three-in-one power electronic compensation transformer substation Download PDFInfo
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- CN111756045B CN111756045B CN202010639907.8A CN202010639907A CN111756045B CN 111756045 B CN111756045 B CN 111756045B CN 202010639907 A CN202010639907 A CN 202010639907A CN 111756045 B CN111756045 B CN 111756045B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The invention discloses a three-in-one power electronic compensation transformer substation which is connected in series in a power supply circuit, comprising: the system comprises a voltage compensation module, an electric energy quality compensation module, an energy storage power module, an electric power electronic compensation transformer station energy management module, a sensing detection module and a public direct current bus. The three-in-one power electronic compensation transformer substation disclosed by the invention integrates three key equipment regulated by a power grid, performs unified energy management, realizes the regulation of peak-valley load around the clock by utilizing an energy storage technology, and can be used as an energy source to supply the voltage compensation system and the electric energy quality compensation system for the energy stored in the electricity consumption valley period, so that the problem of compensation failure caused by the fact that line current is additionally increased when electricity is taken from the power grid in the peak period is effectively avoided. The invention is distributed and arranged at the place where the voltage drops in the long-distance transmission line, can effectively improve the electric energy transmission quality of the whole line, and realizes the comprehensive regulation of the power grid.
Description
Technical Field
The invention belongs to a circuit device or a system for power supply or distribution, and particularly relates to a three-in-one power electronic compensation transformer station of an alternating-current transmission line or an alternating-current distribution network.
Background
In the smart grid construction process, the power transmission and transformation technology is a key technology, necessary guarantee can be provided for safe and stable operation of the smart grid, the operation efficiency of the smart grid can be effectively improved, and the social benefit is increased. The poor economic benefit and low input-output ratio of the power grid construction in the load-dispersed area are the problems generally faced by the power grid companies worldwide, and how to provide suitable power supply service for the population in the load-dispersed area in a more economical way becomes a worldwide hot spot. Because the power supply radius is larger, the problems of low power supply voltage at the tail end of the line and unqualified power quality easily occur, along with the continuous increase of the load of users, the continuous increase of single-point heavy load, the fluctuation of peak and trough of the power grid at night and day, the power supply quality of the users positioned at the tail part of the line can be greatly influenced, the power generation amount is improved to ensure the power supply of the users and waste of a large amount of power resources, the concept of intelligent power grid construction operation is violated, the resource reuse rate is improved under the condition that the management of the side of the intelligent power grid is not forced, and the problem of regulating the peak and trough load of the power grid is gradually brought into social attention.
In the prior art, the load is dispersed, the power supply radius of the power transformation and distribution station is limited, the power supply of the whole area can be realized only by a longer medium-voltage line and the dispersed power transformation and distribution station, the utilization rate of a main transformer of the dispersed transformer station is low, most of power loss is in the process of line transmission, and the terminal voltage characteristic cannot be improved by simply connecting reactive compensation equipment in parallel mainly due to the loss caused by the active current flowing through the longer power transmission line. If the large-capacity power quality comprehensive compensation is realized, the compensation must be realized based on the principle of active compensation. However, some existing active compensation devices require the power grid to provide an additional current required for compensation by taking power from the power grid as an energy source, and this current flows through the power transmission line to cause a lot of additional line loss, and when the load exceeds a certain range, the current required for compensation increases, which in turn leads to a compensation failure. Therefore, a new technology is needed to effectively solve the problems of voltage compensation, power quality compensation, peak-to-valley balance and the like, and realize comprehensive control and regulation of the power transmission and distribution network.
Disclosure of Invention
In view of the above, the invention discloses a three-in-one power electronic compensation transformer substation, which integrates three key equipment regulated by a power grid and performs unified energy management, not only realizes the regulation of peak-valley load around the clock by using an energy storage technology, but also can supply energy stored in a power consumption valley period as an energy source to a voltage compensation module and an electric energy quality compensation module, thereby effectively avoiding the occurrence of compensation failure caused by additional increase of line current required for power taking from the power grid. The invention is distributed and arranged in places needing voltage compensation, electric energy quality compensation, electric power peak shaving and new energy surfing in long-distance transmission lines, so that the electric energy transmission quality of the whole line can be effectively improved, and the comprehensive regulation of a power grid is realized.
In order to achieve the above purpose, the invention adopts the following technical scheme:
A three-in-one power electronic compensation transformer station comprises a three-phase line and a neutral line; the three-phase line and the neutral line are connected in series and in parallel with a voltage compensation module, an electric energy quality compensation module and an energy storage power supply module are connected in parallel between the three-phase line and the neutral line, the power electronic compensation substation energy management module is electrically connected at the output end of the three-phase line through a sensing detection module, and the power electronic compensation substation energy management module is electrically connected with the voltage compensation module, the electric energy quality compensation module and the energy storage power supply module, and the voltage compensation module, the electric energy quality compensation module and the energy storage power supply module are mutually and electrically connected through a common direct current bus.
The input end of the voltage compensation module is connected with the input end of the three-phase line and the input end of the neutral line, the output end of the voltage compensation module is connected with the output end of the three-phase line, and the voltage compensation module is used for compensating the voltage dropped by the power transmission line, and improving the voltage quality so that the voltage at the tail end of the line meets the power supply standard of the power grid;
The power quality compensation module is connected in parallel in the power transmission line, namely between the three-phase line and the neutral line, and is used for realizing the comprehensive compensation of the line current, and comprises: reactive compensation, harmonic compensation and three-phase imbalance compensation are adopted, so that the electric energy transmission quality of the transmission line is comprehensively improved;
The energy storage power supply module is connected in parallel in the power transmission line, namely between the three-phase line and the neutral line, and is used for realizing load peak-valley adjustment of the power grid and providing energy sources required by compensation for the voltage compensation module and the electric energy quality compensation module;
The power electronic compensation substation energy management module is connected with the voltage compensation module, the electric energy quality compensation module, the energy storage power supply module and the sensing detection module and is used for receiving the three-phase voltage and current information of the power transmission line acquired by the sensing detection module, analyzing and processing the three-phase voltage and current information, comprehensively deciding and generating control reference instructions (set values) of all the sub-modules, outputting the control reference instructions (set values) to corresponding sub-module controller units, and carrying out coordinated control to realize unified management of energy flow in the three-in-one power electronic compensation substation;
the sensing detection module is used for acquiring information of the power transmission line and respectively outputting the information to the voltage compensation module, the power quality compensation module, the energy storage power supply module and the power electronic compensation substation energy management module, so as to provide three-phase voltage and current feedback information of the power transmission line operation for the sensing detection module;
The voltage compensation module, the electric energy quality compensation module and the energy storage power supply module are connected and connected in parallel to the common direct current bus, and the common direct current bus is used for realizing energy flow in the three-in-one power electronic compensation transformer substation.
In some embodiments of the invention, the voltage compensation module comprises: the power supply device comprises a power supply unit, a compensation transformer, an alternating current voltage-regulating converter, an inverter and a voltage-regulating control unit, wherein the power supply unit adopts an isolation transformer, a primary side winding of the isolation transformer is connected between a three-phase line and a neutral line in parallel, and a secondary side winding of the isolation transformer is connected with the alternating current voltage-regulating converter through a switching device and is used for acquiring energy sources required by a voltage compensation process from a power grid;
the direct-current side input end of the inverter is connected with the public direct-current bus and is used for acquiring an energy source required by a voltage compensation process from the public direct-current bus;
The alternating current side input end of the alternating current voltage regulating converter is connected with the output end of the power taking unit and the alternating current side output end of the inverter, the alternating current side output end of the alternating current voltage regulating converter is connected with the primary side winding of the compensation transformer and is used for carrying out power conversion according to the control signal output by the voltage regulating control unit, and the required compensation voltage is generated when the circuit needs voltage compensation and is output to the primary side winding of the compensation transformer, so that the corresponding voltage compensation of the circuit is realized;
The secondary side winding of the compensation transformer is connected in series in a three-phase line and is used for compensating the compensation voltage output by the alternating current voltage-regulating converter into a power transmission line;
The output end of the voltage regulating control unit is connected with the electricity taking unit, the alternating current voltage regulating converter and the inverter, the input end of the voltage regulating control unit receives a given control instruction output by the energy management module of the power electronic compensation transformer substation and three-phase voltage information output by the sensing detection module, the three-phase voltage information is used for determining the working state, the energy source and the control strategy of the voltage compensation module according to the information, when voltage compensation is needed by a circuit, a first control instruction is generated to control the on-off of a switching device in the electricity taking unit and the on-off of a switching device in the inverter so as to determine an energy supply source, a second control instruction is generated to output the on-off of a corresponding switching device in the alternating current voltage regulating converter, so that corresponding compensation voltage is generated, and when voltage compensation is not needed by the circuit, the corresponding device is controlled to be turned off, and no compensation voltage is generated.
In some embodiments of the invention, the power quality compensation module comprises: the three-phase four-wire system inverter circuit is based on an active compensation principle, the direct current side of the three-phase four-wire system inverter circuit is connected with the public direct current bus, the alternating current side is connected between the three-phase line and the neutral line in parallel through a reactor and is used for generating compensation current with the same magnitude and opposite phase to the compensated quantity (harmonic current, reactive current and three-phase unbalanced current), and the compensation current is injected into a power grid through the reactor to realize corresponding reactive power, harmonic wave, three-phase unbalanced and the like;
The input end of the power quality compensation control unit receives a given control instruction output by the power electronic compensation substation energy management module and the voltage and current information of the power transmission line output by the sensing detection module, and is used for determining the working state of the power quality compensation module according to the given control instruction and the information, and when the power quality compensation is needed by the line, a third control instruction is generated and output to the driving circuit; when the circuit does not need power quality compensation, the corresponding device is controlled to be turned off, and compensation current is not generated.
The driving circuit is used for amplifying and outputting a third control instruction generated by the electric energy quality compensation control unit to the three-phase four-wire system inverter circuit, and driving each switching device in the three-phase four-wire system inverter circuit to finish on and off so as to generate required compensation current to be injected into a power grid;
In some embodiments of the present invention, the energy storage power module includes: the energy storage converter adopts a reversible PWM rectifier topology, the direct current side of the energy storage converter is connected with a public direct current bus, the alternating current side of the energy storage converter is connected between a three-phase line and a neutral line of a power transmission line in parallel through a reactor and is used for realizing bidirectional flow of energy between the energy storage power supply module and the power transmission line (power grid),
One side of the direct current side of the bidirectional DC/DC converter is connected with the energy storage battery, and the other side of the bidirectional DC/DC converter is connected to the public direct current bus and is used for carrying out electric energy conversion on direct current output by the energy storage battery or direct current input by the direct current bus (6);
The energy storage battery is used for storing energy, and comprises: the power absorbed from the power grid and generated by the new energy source are released when in a discharging mode, and an energy source is provided for the voltage compensation module and the power quality compensation module;
the rectifier adopts an AC/DC topology, an AC input side of the rectifier is connected with an access terminal of the wind turbine generator, and a DC output side of the rectifier is connected to the public DC bus and is used for accessing AC electric energy generated by the wind turbine generator;
The chopper adopts a DC/DC topology, the direct current input side of the chopper is connected with the photovoltaic control access terminal, and the direct current output side of the chopper is connected to the public direct current bus and is used for accessing direct current electric energy generated by photovoltaic power generation;
The output end of the energy storage power supply module control unit is connected with the energy storage converter, the bidirectional DC/C converter, the energy storage battery, the rectifier and the chopper, the input end of the energy storage power supply module control unit receives a control given instruction output by the power electronic compensation transformer station energy management module, three-phase voltage and current information output by the sensing detection module and energy storage battery state information, the energy storage power supply module control unit is used for determining the working state of the energy storage power supply module according to the information, and generating corresponding device on-off signals to be respectively output to the corresponding power converter to control the power converter to perform power conversion in different states, so that the flow of energy in the energy storage module is completed.
In some embodiments of the present invention, the power electronics compensation substation energy management module includes: the system comprises a voltage and current information receiving unit, a power quality comprehensive calculation and analysis unit, an energy storage power supply module state receiving unit, a submodule control given amount comprehensive calculation decision unit, a voltage compensation module control given amount output unit, an energy storage power supply module control given amount output unit and a power quality compensation module control given amount output unit, wherein the voltage and current information receiving unit is used for receiving three-phase voltage and current information of a power grid detected by the sensing detection unit and outputting the three-phase voltage and current information to the power quality comprehensive calculation and analysis unit;
The comprehensive electric energy quality calculation and analysis unit is used for analyzing voltage and current data information in a power transmission line (power grid), acquiring amplitude and phase of the data information, solving information such as compensation voltage amplitude, current amplitude, three-phase imbalance, harmonic wave, line power factor and the like required by the current line, and outputting the information to the submodule control given quantity comprehensive calculation decision unit;
The energy storage power supply module state receiving unit is used for receiving the operation state information of the energy storage power supply module output by the energy storage power supply module, and comprises the residual capacity of an energy storage battery, estimated generated energy and the like of new energy power generation equipment and outputting the estimated generated energy and the like to the submodule control given amount comprehensive calculation decision unit;
The sub-module control given quantity comprehensive calculation decision unit is used for determining the quantity to be compensated and the working modes of all sub-modules according to the power grid analysis information and the state information of the energy storage power supply module in the module, calculating and generating corresponding control given quantity, and respectively outputting the corresponding control given quantity to the control units of the corresponding sub-modules through the voltage compensation module control given quantity output unit, the energy storage power supply module control given quantity output unit and the electric energy quality compensation module control given quantity output unit for control, so that unified coordination, control and management of the energy in the power electronic compensation substation are realized.
In some embodiments of the present invention, the voltage compensation module, the power quality compensation module and the energy storage power module are connected in parallel to the common dc bus, and the relative position connection relationship of the three sub-modules may be determined according to the actual compensation condition of the line.
In some embodiments of the present invention, when the device is near the end of the line and the load needs a large amount of reactive compensation, the voltage compensation module, the power quality compensation module and the energy storage power module adopt a first connection mode, and the relative position connection relationship is as follows: the energy storage power supply module is close to the three-phase line input end and the neutral line input end, the electric energy quality compensation module is close to the three-phase line output end and the neutral line output end, and the voltage compensation module is positioned between the connecting positions of the two parallel modules.
In some embodiments of the present invention, the device is installed in a long whisker line, and when the load peak regulation requirement is large, the voltage compensation module, the power quality compensation module and the energy storage power module adopt a second connection mode, and the relative position connection relationship is as follows: the power quality compensation module is close to the three-phase line input end and the neutral line input end, the energy storage power supply module is close to the three-phase line output end and the neutral line output end, the voltage compensation module is located in the middle of the connecting positions of the two parallel modules, and the interior of the transformer substation passes through the common power supply module.
In some embodiments of the present invention, the sensing detection unit may employ a sampling module in the prior art, for example, a Shenzhen jinshen JSY-MK-141 series sampling module, and the like.
In some embodiments of the present invention, the three-in-one power electronic compensation substation may be distributed in a place where voltage drop occurs, power quality compensation is required, and power peak regulation control is required in a long-distance transmission line according to the actual situation of a power supply and distribution line.
Compared with the prior art, the three-in-one power electronic compensation transformer substation has the following obvious prominent substantive characteristics and remarkable technical progress:
1. According to the three-in-one power electronic compensation transformer substation, key equipment for regulating three power grids of the voltage compensation module, the power quality compensation module and the energy storage module are arranged in a centralized mode, the positions of the equipment are flexibly adjusted according to the actual conditions of the lines, the three-in-one power electronic compensation transformer substation is arranged in a position where voltage drop occurs in a power transmission line and a power distribution line in a distributed mode, the voltage can be lifted in a segmented mode, the power quality is improved, the power quality of a terminal user is ensured, line transmission loss is greatly reduced, the peak-to-valley balance of the power grid is regulated, and comprehensive regulation of the power grid is achieved.
2. The voltage compensation module and the electric energy quality compensation module are both compensated based on the active compensation principle, but different from the prior art, the three-in-one power electronic compensation transformer substation provided by the invention utilizes the energy storage power supply module to provide energy sources for compensation equipment in the peak period of a power grid with larger load, and the energy in the energy storage module is mainly from the energy absorbed in the valley period of the power grid and the electric energy generated by new energy power generation equipment.
3. The three-in-one power electronic compensation transformer substation can effectively realize peak regulation control of a power grid through the energy storage power supply module, can uniformly manage energy through the energy management module under different running states of the power grid, and controls the energy flowing process inside the three-in-one power electronic compensation transformer substation module and the interaction process between the three-in-one power electronic compensation transformer substation module and external energy so as to realize optimal configuration of the energy and improve the utilization efficiency of the energy.
Drawings
Fig. 1 is a schematic structural diagram of a three-in-one power electronic compensation substation according to the present invention.
Fig. 2 is a schematic diagram of a voltage compensation module according to the present invention.
Fig. 3 is a schematic structural diagram of the power quality compensation module according to the present invention.
Fig. 4 is a schematic structural diagram of an energy storage power module according to the present invention.
Fig. 5 is a schematic structural diagram of the power electronic compensation substation energy management module of the present invention.
Detailed Description
In order to better explain the present invention and to facilitate understanding of the technical solutions of the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific examples. It is to be understood that the following examples are provided for illustration only and are not intended to represent or limit the scope of the invention as claimed.
Embodiment one:
Referring to fig. 1 to 5, a three-in-one power electronic compensation substation includes three-phase lines and neutral lines; the three-phase line is connected in series and parallel with a voltage compensation module 1, an electric energy quality compensation module 2 and an energy storage power supply module 3 are connected in parallel between the three-phase line and a neutral line, an electric power electronic compensation substation energy management module 4 is electrically connected at the output end of the three-phase line through a sensing detection module 5, the electric power electronic compensation substation energy management module 4 is electrically connected with the voltage compensation module 1, the electric energy quality compensation module 2 and the energy storage power supply module 3, and the voltage compensation module 1, the electric energy quality compensation module 2 and the energy storage power supply module 3 are mutually and electrically connected through a common direct current bus 6.
Embodiment two:
As shown in fig. 1, a three-in-one power electronic compensation substation comprises a three-phase line, a neutral line, a voltage compensation module 1, a power quality compensation module 2, an energy storage power module 3, a power electronic compensation substation energy management module 4, a sensing detection unit 5 and a common direct current bus 6, wherein,
The input end of the voltage compensation module 1 is connected with the input end of the three-phase line and the input end of the neutral line, the output end of the voltage compensation module is connected with the output end of the three-phase line, and the voltage compensation module is used for compensating the voltage dropped by the power transmission line, improving the voltage quality and enabling the voltage at the tail end of the line to meet the power supply standard of the power grid;
The power quality compensation module 2 is connected in parallel with the power transmission line, namely, between the three-phase line and the neutral line, and is used for realizing the comprehensive compensation of the line current, and comprises: reactive compensation, harmonic compensation, three-phase imbalance compensation and the like, and comprehensively improves the electric energy transmission quality of the transmission line;
the energy storage power supply module 3 is connected in parallel with the power transmission line, namely between the three-phase line and the neutral line, and is used for realizing load peak-valley adjustment of the power grid and providing energy sources for the voltage compensation module 1 and the electric energy quality compensation module 2;
The power electronic compensation transformer station energy management module 4 is connected with the voltage compensation module 1, the power quality compensation module 2, the energy storage power supply module 3 and the sensing detection module 5, and is used for receiving the three-phase voltage and current information of the power transmission line acquired by the sensing detection module, analyzing and processing the three-phase voltage and current information, acquiring the running states of the sub-modules in an information interaction mode, comprehensively deciding, generating control reference instructions (set values) of all the sub-modules, outputting the control reference instructions (set values) to corresponding sub-module controller units, carrying out coordinated control, and realizing unified management of energy flow in the three-in-one power electronic compensation transformer station;
The sensing detection unit 5 is used for acquiring information of the power transmission line and outputting the information to the voltage compensation module 1, the power quality compensation module 2, the energy storage power supply module 3 and the power electronic compensation substation energy management module 4, so as to provide three-phase voltage and current real-time feedback information of the power transmission line operation for the power transmission line;
The voltage compensation module 1, the electric energy quality compensation module 2 and the energy storage power supply module 3 are connected in parallel to a common direct current bus 6, and the common direct current bus 6 is used for realizing energy flow in the three-in-one power electronic compensation transformer substation.
It should be noted that the system configuration diagram shown in fig. 1 is a schematic diagram of the first connection relationship of the present invention, and in some other embodiments of the present invention, the second connection relationship may be adopted, that is, the positions of the power quality compensation module 2 and the energy storage power module 3 are interchanged, and the specific connection relationship of the three sub-modules may be configured according to the actual requirements of the circuit.
The voltage compensation 1 module described above, as shown in fig. 2, includes: the power taking unit 11, the compensation transformer 12, the alternating current voltage-regulating converter 13, the inverter 14 and the voltage-regulating control unit 15, wherein in the embodiment, the power taking unit 11 adopts an isolation transformer, a primary winding of the isolation transformer is connected between a three-phase line and a neutral line in parallel, and a secondary winding of the isolation transformer is connected with the alternating current voltage-regulating converter 13 through a switching device and is used for obtaining energy sources required in a voltage compensation process from a power grid; the dc side input end of the inverter 14 is connected to the common dc bus 6, and is used for obtaining an energy source required by a voltage compensation process from the common dc bus 6; the secondary side winding of the compensation transformer 12 is connected in series in a three-phase line, and the primary side winding is connected with the output end of the alternating current side of the alternating current voltage regulating converter 13 and is used for coupling the compensation voltage output by the alternating current voltage regulating converter 13 into a power transmission line; in this embodiment, the ac voltage-regulating converter 13 adopts a bidirectional thyristor ac voltage-regulating circuit, the ac side output end of the ac voltage-regulating converter 13 is connected to the primary side winding of the compensation transformer 12, the ac side input port includes two groups of end buttons, one group is connected to the output end of the power-taking unit 11, the other group is connected to the ac side output end of the inverter 14, the end button connected to the power-taking unit 11 is used for obtaining the energy required for compensation from the power grid, the end button connected to the inverter 14 is used for obtaining the energy required for compensation from the common dc bus 6 inside the power electronic compensation substation, by controlling the on-off of the switching device S in the power-taking unit 11 and the on-off of the switching device in the inverter, the ac side energy source of the ac voltage regulating converter, the power grid or the power electronic compensation substation can be selected. The output end of the voltage regulating control unit 15 is connected with the electricity taking unit 11, the alternating current voltage regulating converter 13 and the inverter 14, and the input end of the voltage regulating control unit receives control given information (including voltage amplitude and phase) output by the power electronic compensation transformer station energy management module 4 and line voltage information (including voltage amplitude and phase) output by the sensing detection module 5 to perform voltage closed-loop control. When the line needs voltage compensation, the voltage regulating control unit 15 generates a first control instruction to control the on-off of the switching device in the electricity taking unit (11) and the on-off of the switching device S in the inverter (14) so as to determine an energy supply source, when the power grid is in a peak period, the control principle of the first control instruction is to turn off the switching device S, the energy source provided by the energy storage power supply module 3 is selected to be connected through the inverter 14, and when the power grid is in a valley period, the control principle of the first control instruction is to turn on the switching device S, and the energy source provided by the power grid is selected to be connected through the electricity taking unit 11. Meanwhile, the voltage regulating control unit 15 generates a second control instruction and outputs the second control instruction to the alternating current voltage regulating converter (13) to control the on-off of a corresponding switching device in the alternating current voltage regulating converter, so that corresponding compensation voltage is generated, and when voltage compensation is not needed in the circuit, the corresponding device is controlled to be turned off, and no compensation voltage is generated. In some other embodiments of the present invention, the AC voltage regulating converter may use any circuit topology in the prior art capable of achieving AC/AC voltage regulation, including: an ac-ac frequency-changing circuit (not used for changing frequency but used for changing voltage), an ac-dc-ac frequency-changing circuit, an ac chopper circuit, and the like.
The power quality compensation module 2 described above, as shown in fig. 3, includes: the three-phase four-wire system inverter circuit 21, the driving circuit 22 and the electric energy quality compensation control unit 23, wherein the three-phase four-wire system inverter circuit 21 adopts a diode clamping type three-level inverter circuit, the direct current side is connected with the public direct current bus 6, the alternating current side is connected between a three-phase line and a neutral line in parallel through a reactor, based on the principle of active compensation, compensation currents with the same magnitude and opposite phases with the compensated quantities (harmonic current, reactive current and three-phase unbalanced current) are generated according to control signals, and are injected into a power grid through the reactor to realize corresponding reactive power, harmonic wave, three-phase unbalanced and other compensation; the input end of the power quality compensation control unit 23 receives control given information output by the power electronic compensation substation energy management module 4 and three-phase voltage and current information output by the sensing detection module 5, and determines the working state of the power quality compensation module 2 according to the control information, when the power quality compensation is required by a circuit, closed-loop control is performed according to compensation given quantity input by the power electronic energy management module 4 and three-phase current information detected by the sensing detection module 5 in real time, a current type PWM controller is adopted, a corresponding third control instruction is generated and output to the driving circuit 22, the driving circuit 22 amplifies the third control instruction generated by the power quality compensation control unit 23 and outputs the third control instruction to the three-phase four-wire inverter circuit (21), and all switching devices in the driving circuit are driven to be switched on and off, so that required compensation current is generated and injected into a power grid; when the circuit does not need power quality compensation, the corresponding device is controlled to be turned off, and compensation current is not generated.
The energy storage power supply module 3 includes, as shown in fig. 4: the energy storage converter 31, the bidirectional DC/DC converter 32, the energy storage battery 33, the rectifier 34, the chopper 35, and the energy storage power supply module control unit 36. The energy storage converter adopts a reversible PWM rectifier topology, the direct current side of the energy storage converter is connected with a public direct current bus (6), and the alternating current side of the energy storage converter is connected between a three-phase line and a neutral line of a power transmission line in parallel through a reactor and is used for realizing bidirectional flow of energy between the energy storage power supply module and the power transmission line (power grid). When working in the forward power conversion state, the energy storage converter 31 works in the rectifier state to absorb the energy fed back by the power grid, and when working in the reverse power conversion state, the energy storage converter 31 works in the inverter state to inject energy into the power grid; the bidirectional DC/DC converter adopts bidirectional buck-boost circuit topology, the low-voltage side of the bidirectional DC/DC converter is connected with the energy storage battery, and the high-voltage side of the bidirectional DC/DC converter is connected to the public direct current bus for bidirectional electric energy conversion of direct current output by the energy storage battery or direct current input by the direct current bus 6; the energy storage battery 33 is used for storing energy, including: the electric energy absorbed from the power grid and the electric energy generated by the new energy source are released when the electric energy is in a discharging mode, and an energy source is provided for the voltage compensation module 1 and the electric energy quality compensation module 2; the rectifier 34 adopts an AC/DC topology, an AC input side is connected with an access terminal of the wind turbine, and a DC output side is connected to the public DC bus for accessing electric energy generated by the wind turbine; the chopper 35 adopts a DC/DC topology, the direct current input side of the chopper is connected with the photovoltaic control access terminal, and the direct current output side of the chopper is connected to the public direct current bus for accessing electric energy generated by photovoltaic power generation; the output end of the energy storage power supply module control unit 36 is connected with other units (31-35) of the energy storage power supply module, the input end of the energy storage power supply module control unit receives a given control instruction output by the power electronic compensation substation energy management module 4, three-phase voltage and current information output by the sensing detection module 5 and state information of the energy storage battery 33, the working state of the energy storage power supply module 3 is determined according to the information, and corresponding device on-off signals are generated and respectively output to corresponding power converters to control the power converters to perform power conversion in different states so as to realize the flow of energy in the energy storage module.
The power electronic compensation substation energy management module 4 described above, as shown in fig. 5, includes: the voltage and current information receiving unit 41, the power quality comprehensive calculation and analysis unit 42, the energy storage power supply module state receiving unit 43, the submodule control given amount comprehensive calculation decision unit 44, the voltage compensation module control given amount output unit 45, the energy storage power supply module control given amount output unit 46 and the power quality compensation module control given amount output unit 47, wherein the voltage and current information receiving unit 41 receives and outputs the three-phase voltage and current information U abc、Iabc of the power grid detected by the sensing detection module 5 to the power quality comprehensive calculation and analysis unit 42 for analysis; the comprehensive calculation and analysis unit 42 of electric energy quality is used for analyzing the voltage and current data information in the electric transmission line (power grid), obtaining the amplitude and phase of the data information, solving the information such as the compensation voltage amplitude, the current amplitude, the three-phase imbalance, the harmonic wave, the line power factor and the like required by the current line, and outputting the information to the sub-module control given amount comprehensive calculation and decision unit 44; the energy storage power supply module state receiving unit 43 receives the operation state information of the energy storage power supply module output by the energy storage power supply module 3, including the residual capacity of the energy storage battery, estimated power generation capacity of the new energy power generation equipment and the like, and outputs the estimated power generation capacity and the like to the sub-module control given amount comprehensive calculation decision unit 44; the sub-module control given quantity comprehensive calculation decision unit 44 determines the quantity to be compensated and the working mode of each sub-module according to the power grid analysis information and the state information of the energy storage power supply module in the module, calculates and generates corresponding control given quantity, and the voltage compensation module control given quantity output unit 45, the energy storage power supply module control given quantity output unit 46 and the electric energy quality compensation module control given quantity output unit 47 respectively output to the control units of the corresponding sub-modules to control, so that unified coordination, control and management of the energy in the power electronic compensation substation are realized.
The three-in-one power electronic compensation transformer substation can be distributed and arranged in places where voltage drop, power quality compensation and power peak regulation control are required in a long-distance power transmission line according to the actual conditions of a power supply and distribution line. The three-in-one power electronic compensation transformer substation disclosed by the invention integrates and configures three key equipment regulated by a power grid and performs unified energy management, not only can realize the regulation of peak-valley load day and night by utilizing an energy storage technology, but also can supply energy stored in a power consumption valley period as an energy source to a voltage compensation module and an electric energy quality compensation module, so that the problem of compensation failure caused by the fact that line current is additionally increased when power is taken from the power grid is effectively avoided, and the comprehensive regulation and comprehensive promotion of power transmission are effectively realized.
It will thus be seen that the objects of the present invention have been fully and effectively attained. The functional and structural principles of the present invention have been shown and described in the examples and embodiments may be modified at will without departing from such principles. The invention encompasses all modifications and embodiments based on the spirit and scope of the following claims.
Claims (6)
1. A three-in-one power electronic compensation transformer station comprises a three-phase line and a neutral line; the method is characterized in that: a voltage compensation module (1) is connected in series and parallel between the input end and the output end of the three-phase line, namely, the input end of the voltage compensation module (1) is connected with the input end of the three-phase line and the input end of the neutral line, the output end of the voltage compensation module is connected with the output end of the three-phase line, the voltage compensation module (1) is used for compensating the voltage of the drop of the power transmission line, and the voltage quality is improved so that the voltage at the tail end of the line meets the power supply standard of a power grid;
and an electric energy quality compensation module (2) is connected between the three-phase line and the neutral line in parallel, and the electric energy quality compensation module (2) is used for realizing comprehensive compensation of line current and comprises: reactive compensation, harmonic compensation and three-phase imbalance compensation are adopted, so that the electric energy transmission quality of the transmission line is comprehensively improved;
An energy storage power supply module (3) is connected between the three-phase line and the neutral line in parallel, and the energy storage power supply module (3) is used for realizing load peak-valley adjustment of a power grid and providing energy sources required by compensation of the voltage compensation module (1) and the electric energy quality compensation module (2);
The power electronic compensation substation energy management module (4) is electrically connected with the voltage compensation module (1), the power quality compensation module (2), the energy storage power supply module (3) and the sensing detection module (5) and is used for receiving and analyzing three-phase voltage and current information of the power transmission line acquired by the sensing detection module (5), comprehensively deciding to generate control reference instructions (set values) of all sub-modules, outputting the control reference instructions (set values) to corresponding sub-module controller units, and carrying out coordinated control to realize unified management of energy flow in the three-in-one power electronic compensation substation;
The sensing detection module (5) is used for acquiring information of the power transmission line and respectively outputting the information to the voltage compensation module (1), the power quality compensation module (2), the energy storage power supply module (3) and the power electronic compensation substation energy management module (4), so as to provide three-phase voltage and current feedback information of the power transmission line operation for the information;
The voltage compensation module (1), the electric energy quality compensation module (2) and the energy storage power supply module (3) are connected in parallel to a common direct current bus (6), and the common direct current bus (6) is used for realizing energy flow in the three-in-one power electronic compensation transformer substation;
The voltage compensation module (1) comprises: the power taking unit (11), the compensation transformer (12), the alternating current voltage-regulating converter (13), the inverter (14) and the voltage-regulating control unit (15), wherein the power taking unit (11) adopts an isolation transformer, a primary side winding of the isolation transformer is connected between a three-phase line and a neutral line in parallel, and a secondary side winding of the isolation transformer is connected with the alternating current voltage-regulating converter (13) through a switching device and is used for obtaining an energy source required in a voltage compensation process from a power grid;
The direct-current side input end of the inverter (14) is connected with the public direct-current bus (6) and is used for acquiring an energy source required by a voltage compensation process from the public direct-current bus (6);
The alternating current side input end of the alternating current voltage regulating converter (13) is connected with the output end of the electricity taking unit (11) and the alternating current side output end of the inverter (14), the alternating current side output end of the alternating current voltage regulating converter (13) is connected with the primary side winding of the compensation transformer (12) and is used for carrying out power conversion according to the control signal output by the voltage regulating control unit (15), and the required compensation voltage is generated when the circuit needs voltage compensation and is output to the primary side winding of the compensation transformer (12) to realize the corresponding voltage compensation of the circuit;
The secondary side winding of the compensation transformer (12) is connected in series in a three-phase line and is used for coupling the compensation voltage output by the alternating current voltage-regulating converter (13) into a power transmission line;
The output end of the voltage regulating control unit (15) is connected with the electricity taking unit (11), the alternating current voltage regulating converter (13) and the inverter (14), the input end of the voltage regulating control unit (15) receives a control given instruction output by the power electronic compensation substation energy management module (4) and three-phase voltage information output by the sensing detection module (5), the three-phase voltage information is used for determining the working state, the energy source and the control strategy of the voltage compensation module, when voltage compensation is needed by a circuit, the first control instruction is generated to control the on-off of a switching device in the electricity taking unit (11) and the on-off of the switching device in the inverter (14) so as to determine an energy supply source, the second control instruction is generated to output the on-off of a corresponding switching device in the alternating current voltage regulating converter (13), so as to generate corresponding compensation voltage, and when the voltage compensation is not needed by the circuit, the corresponding device is controlled to be turned off, and the compensation voltage is not generated.
2. The three-in-one power electronic compensation substation of claim 1, wherein: the power quality compensation module (2) comprises: the three-phase four-wire system inverter circuit (21), the driving circuit (22) and the electric energy quality compensation control unit (23), wherein the three-phase four-wire system inverter circuit (21) is based on an active compensation principle, the direct current side of the three-phase four-wire system inverter circuit is connected with the public direct current bus (6), the alternating current side is connected between the three-phase line and the neutral line in parallel through a reactor, and the three-phase four-wire system inverter circuit is used for generating compensation currents with the same magnitude and opposite phases with the compensated quantities (harmonic current, reactive current and three-phase unbalanced current), and the compensation currents are injected into a power grid through the reactor to realize corresponding reactive power, harmonic wave and three-phase unbalanced compensation;
the input end of the power quality compensation control unit (23) receives a given control instruction output by the power electronic compensation substation energy management module (4) and three-phase current information output by the sensing detection module (5), and is used for determining the working state of the power quality compensation module according to the information, and when a circuit needs power quality compensation, a third control instruction is generated and output to the driving circuit; when the circuit does not need power quality compensation, the corresponding device is controlled to be turned off, and compensation current is not generated;
the driving circuit (22) is used for amplifying and outputting a third control instruction generated by the power quality compensation control unit (23) to the three-phase four-wire system inverter circuit (21), and driving each switching device inside the three-phase four-wire system inverter circuit to complete on and off so as to generate required compensation current to be injected into a power grid.
3. The three-in-one power electronic compensation substation of claim 1, wherein: the energy storage power supply module (3) comprises an energy storage converter (31), a bidirectional DC/DC converter (32), an energy storage battery (33), a rectifier (34), a chopper (35) and an energy storage power supply module control unit (36), wherein the energy storage converter (31) adopts a reversible PWM rectifier topology, the direct current side of the energy storage converter is connected with a public direct current bus (6), and the alternating current side of the energy storage converter is connected between a three-phase line and a neutral line of a power transmission line in parallel through a reactor and is used for realizing bidirectional flow of energy between the energy storage power supply module (3) and the power transmission line (power grid);
One side of the direct current side of the bidirectional DC/DC converter (32) is connected with the energy storage battery (33), and the other side of the bidirectional DC/DC converter is connected to the public direct current bus (6) for carrying out electric energy conversion on direct current output by the energy storage battery (33) or direct current input by the direct current bus (6);
the energy storage battery (33) for storing energy, comprising: the electric energy absorbed from the power grid and generated by the new energy source is released when in a discharging mode, and an energy source is provided for the voltage compensation module (1) and the electric energy quality compensation module (2);
the rectifier (34) adopts an AC/DC topology, an alternating current input side of the rectifier is connected with an access terminal of the wind turbine, and a direct current output side of the rectifier is connected to the public direct current bus (6) and is used for accessing alternating current electric energy generated by the wind turbine;
The chopper (35) adopts DC/DC topology, the direct current input side of the chopper is connected with the photovoltaic control access terminal, and the direct current output side of the chopper is connected to the public direct current bus (6) and is used for accessing direct current electric energy generated by photovoltaic power generation;
The output end of the energy storage power supply module control unit (36) is connected with the energy storage converter (31), the bidirectional DC/C converter (32), the energy storage battery (33), the rectifier (34) and the chopper (35), the input end of the energy storage power supply module control unit receives a control given instruction output by the power electronic compensation transformer station energy management module (4), three-phase voltage and current information output by the sensing detection module (5) and energy storage battery state information, and the three-phase voltage and current information and the energy storage battery state information are used for determining the working state of the energy storage power supply module according to the information, generating corresponding device on-off signals, respectively outputting the corresponding power converters, controlling the power converters to perform power conversion in different states, and accordingly completing the flow of energy in the energy storage module.
4. The three-in-one power electronic compensation substation of claim 1, wherein: the power electronic compensation substation energy management module (4) comprises a voltage and current information receiving unit (41), a power quality comprehensive calculation and analysis unit (42), an energy storage power supply module state receiving unit (43), a submodule control given amount comprehensive calculation decision unit (44), a voltage compensation module control given amount output unit (45), an energy storage power supply module control given amount output unit (46) and a power quality compensation module control given amount output unit (47), wherein the voltage and current information receiving unit (41) is used for receiving three-phase voltage and current information of a power grid detected by the sensing detection module (5) and outputting the three-phase voltage and current information to the power quality comprehensive calculation and analysis unit (42);
The comprehensive electric energy quality calculation and analysis unit (42) is used for analyzing voltage and current data information in the electric transmission line (power grid), acquiring amplitude and phase of the data information, solving compensation voltage amplitude, current amplitude, three-phase unbalance, harmonic wave and line power factor information required by the current line, and outputting the information to the submodule control given quantity comprehensive calculation and decision unit (44);
The energy storage power supply module state receiving unit (43) is used for receiving the energy storage power supply module operation state information output by the energy storage power supply module (3), and comprises the residual capacity of an energy storage battery, and the new energy power generation equipment estimates the power generation capacity and outputs the power generation capacity to the submodule control given amount comprehensive calculation decision unit (44);
The submodule control given quantity comprehensive calculation decision unit (44) is used for determining the quantity to be compensated and the working modes of all submodules according to the power grid analysis information and the state information of the energy storage power supply module in the module, calculating and generating corresponding control given quantity, and the voltage compensation module control given quantity output unit (45), the energy storage power supply module control given quantity output unit (46) and the electric energy quality compensation module control given quantity output unit (47) respectively output the control units of the corresponding submodules to control, so that unified coordination, control and management of the energy in the power electronic compensation transformer substation are realized.
5. The three-in-one power electronic compensation substation of claim 1, wherein: in the three-in-one power electronic compensation transformer substation, any one of a first connection mode and a second connection mode is adopted in the relative position connection relation of the voltage compensation module (1), the electric energy quality compensation module (2) and the energy storage power supply module (3):
the first connection mode is that the energy storage power supply module (3) is close to the three-phase line input end and the neutral line input end, the electric energy quality compensation module (2) is close to the three-phase line output end and the neutral line output end, and the voltage compensation module (1) is positioned between the connection positions of the two parallel modules;
the second connection mode is that the power quality compensation module (2) is close to the three-phase line input end and the neutral line input end, the energy storage power module (3) is close to the three-phase line output end and the neutral line output end, and the voltage compensation module (1) is located in the middle of the connection positions of the two parallel modules.
6. The three-in-one power electronic compensation substation of claim 1, wherein: the three-in-one power electronic compensation transformer substation can be distributed and arranged in places where voltage drop occurs, power quality compensation is needed and power peak regulation control is needed in a long-distance power transmission line according to the actual conditions of power supply and distribution lines.
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