WO2018177062A1 - 供电系统和供电系统的控制方法 - Google Patents
供电系统和供电系统的控制方法 Download PDFInfo
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- WO2018177062A1 WO2018177062A1 PCT/CN2018/077537 CN2018077537W WO2018177062A1 WO 2018177062 A1 WO2018177062 A1 WO 2018177062A1 CN 2018077537 W CN2018077537 W CN 2018077537W WO 2018177062 A1 WO2018177062 A1 WO 2018177062A1
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- power
- energy storage
- load
- photovoltaic
- grid
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000004146 energy storage Methods 0.000 claims abstract description 162
- 238000010248 power generation Methods 0.000 claims description 35
- 230000002457 bidirectional effect Effects 0.000 claims description 28
- 238000001514 detection method Methods 0.000 claims 2
- 210000004027 cell Anatomy 0.000 description 44
- 238000005070 sampling Methods 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000013461 design Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 238000012356 Product development Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000000352 storage cell Anatomy 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H02J3/383—
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Definitions
- the present invention relates to the field of power electronics, and in particular to a control method and a power supply system for a power supply system.
- the existing photovoltaic power supply system uses photovoltaic cells (PV) to be supplied to the grid or load through an inverter and a direct current-direct current (DC-DC) conversion.
- PV photovoltaic cells
- DC-DC direct current-direct current
- the existing new energy storage systems are mostly grid-side storage, and the product development cost is high. Although it can solve the problem of redundant energy storage, it also increases the burden and risk of the grid.
- the invention provides a control method of a power supply system and a power supply system, which can reduce the burden of the power grid and can improve the utilization rate of the renewable energy.
- a power supply system control method includes: a photovoltaic battery pack, an energy storage system, a photovoltaic inverter, and a controller, wherein the photovoltaic battery pack includes N photovoltaic cells, and N is An integer greater than 1, the photovoltaic cell is connected to the grid or load by the photovoltaic inverter, the energy storage system is connected in parallel with the photovoltaic cell, and the energy storage system passes through the photovoltaic inverter The grid is or coupled to the load, the control method comprising: the controller controlling at least one of the photovoltaic panel and the energy storage system to supply power to the grid or the load.
- the renewable energy is fully absorbed by adding a plurality of photovoltaic cells in the power supply system, and the energy storage system is disposed on one side of the photovoltaic battery group, and the photovoltaic battery is controlled by the controller.
- the group and/or energy storage system supplies power to the grid or load, thereby reducing the burden on the grid and increasing the utilization of renewable energy.
- a power supply system includes: a photovoltaic battery pack, an energy storage system, a photovoltaic inverter, and a controller, wherein the photovoltaic battery pack includes N photovoltaic cells, and N is greater than 1
- the photovoltaic cell is connected to the grid or load through the photovoltaic inverter; the energy storage system is connected in parallel with the photovoltaic cell, and the energy storage system passes the photovoltaic inverter and the A power grid is coupled to the load; the controller is configured to control at least one of the photovoltaic battery pack and the energy storage system to power the grid or the load.
- the power supply system increases the renewable energy by adding a plurality of photovoltaic cells, and arranges the energy storage system on one side of the photovoltaic battery, and controls the photovoltaic battery and/or by using the controller.
- the energy storage system supplies power to the grid or load, thereby reducing the burden on the grid and increasing the utilization of renewable energy.
- FIG. 1 is a schematic flow chart of a control method of a power supply system according to an embodiment of the present invention
- FIG. 2 is a schematic flowchart of a control method of a power supply system according to another embodiment of the present invention.
- FIG. 3 is a flow chart of a control method of a power supply system according to another embodiment of the present invention.
- FIG. 4 is a block schematic diagram of a power supply system in accordance with one embodiment of the present invention.
- FIG. 5 is a block diagram showing a power supply system according to another embodiment of the present invention.
- FIG. 6 is a block schematic diagram of a power supply system in accordance with another embodiment of the present invention.
- the power supply system includes a photovoltaic battery pack, an energy storage system, a photovoltaic inverter and a controller.
- the photovoltaic battery pack includes N photovoltaic cells, N is an integer greater than 1, and the photovoltaic battery pack is connected to the power grid or load through the photovoltaic inverter, and is stored.
- the energy system is connected in parallel with the photovoltaic battery pack, and the energy storage system is connected to the power grid or to the load through the photovoltaic inverter.
- the control method of the power supply system includes:
- the controller acquires control information.
- the controller controls at least one of the photovoltaic battery pack and the energy storage system to supply power to the grid or the load according to the control information.
- the renewable energy is fully absorbed by adding a plurality of photovoltaic cells in the power supply system, and the energy storage system is disposed on one side of the photovoltaic battery group, and the photovoltaic battery is controlled by the controller.
- the group and/or energy storage system supplies power to the grid or load, thereby reducing the burden on the grid and increasing the utilization of renewable energy.
- the controller may select at least one of the photovoltaic battery pack and the energy storage system to power the grid or load based on the control information.
- the control information may be an external control signal received by the controller, such as a signal directly supplied by a suitable photovoltaic battery pack that is directly externally input.
- the control information may also be that the controller selectively uses the photovoltaic battery pack and/or the energy storage system to supply power according to the power generated by the photovoltaic battery pack and the required power of the grid or load.
- the number of photovoltaic cells in the photovoltaic cell group in the power supply system of the present application is greater than 1, that is, the photovoltaic cell is newly added in the application, so that the photovoltaic cell can fully absorb the light energy and reduce the loss of the light energy, so that the light energy is effectively utilized.
- the photovoltaic energy is fully absorbed, and while satisfying the power supply for the power grid or the load, more photovoltaic cell energy can be stored in the energy storage system, and the storage of the energy storage battery is increased.
- Energy rate when the photovoltaic battery pack energy is insufficient, power the grid or load to improve the utilization rate of renewable energy. This can increase the cumulative power generation when the photovoltaic inverter power is constant.
- the existing power supply system solution uses the power grid as the coupling point, and the energy storage battery is installed at the power grid end, and the power is stored at the power grid end.
- the installed capacity of the power generation equipment and the power equipment of the power grid increases.
- the factors that need to be controlled increase, and the burden on the grid will increase.
- the difficulty of power grid regulation will increase, and the expenditure will increase accordingly.
- the energy storage system of the present application is connected in parallel with the photovoltaic battery group, and the energy storage system is arranged on one side of the photovoltaic battery group, which can reduce the burden on the power grid side and reduce the expenditure.
- the photovoltaic battery pack of the present application includes a plurality of photovoltaic cells, and the photovoltaic battery pack is connected to the load through the photovoltaic inverter.
- the photovoltaic battery pack is also connected to the energy storage battery in the energy storage system through the bidirectional DC-DC, so that When the energy storage battery supplies power to the load, the convertible power in the circuit is no longer limited, which can improve the utilization rate of the photovoltaic cell and improve the discharge efficiency.
- a plurality of photovoltaic cells share a photovoltaic inverter, and a combination design of one or more sets of photovoltaic cells, inverters, and DC-DCs is simply added, while meeting the load power demand. It also saves component count.
- the energy storage system in the present application includes M energy storage batteries and M bidirectional DC/DC, wherein M energy storage batteries are connected in parallel, and M energy storage batteries are in one-to-one correspondence with M bidirectional DC/DCs, and M is positive. Integer.
- Each energy storage battery is connected to the photovoltaic battery pack through a corresponding bidirectional DC/DC, and each energy storage battery is also connected to the power grid or load through a photovoltaic inverter. In this way, by adding a plurality of energy storage batteries, when the power of the photovoltaic battery pack is still supplied to the power grid or the load remains, the power is stored in the energy storage battery, so that the power of the subsequent photovoltaic battery pack is insufficient. Multiple energy storage batteries result in greater storage capacity and improved light utilization.
- the embodiments of the present application may be applied to the network or the off-network, and the application scenarios of the grid connection or the off-network are not limited.
- the photovoltaic battery and/or the energy storage system may supply power to the grid. Power the load.
- the control method of Figure 2 can be implemented by a controller of the power supply system.
- the power supply system includes a photovoltaic battery pack, an energy storage system, a photovoltaic inverter and a controller.
- the photovoltaic battery pack includes N photovoltaic cells, N is an integer greater than 1, and the photovoltaic battery pack is connected to the power grid or load through the photovoltaic inverter, and is stored.
- the energy system is connected in parallel with the photovoltaic battery pack, and the energy storage system is connected to the power grid or to the load through the photovoltaic inverter.
- the control method of the power supply system includes:
- the controller receives the control signal.
- the control signal may be received by the controller from the outside, or may be received by the controller from the photovoltaic battery pack or the power grid or the load, etc., and the present application does not limit this, as long as the signal used to control the power supply to the power grid or the load is used. Within the scope of protection of this application.
- the controller controls at least one of the photovoltaic battery pack and the energy storage system to supply power to the grid or the load according to the control signal.
- the grid or load in the present application may be powered solely by the photovoltaic array, for example, at a sufficient solar energy, ie, the power generated by the photovoltaic stack is sufficient to provide a load or grid demand.
- the photovoltaic battery group can also be controlled to charge the energy storage battery in the energy storage system.
- the grid or load in this application can also be powered solely by the energy storage system.
- the energy storage battery in the energy storage system can be used to supply power to the grid or load.
- the renewable energy is fully absorbed by adding a plurality of photovoltaic cells in the power supply system, and the energy storage system is disposed on one side of the photovoltaic battery group, and the photovoltaic battery is controlled by the controller.
- the group and/or energy storage system supplies power to the grid or load, thereby reducing the burden on the grid and increasing the utilization of renewable energy.
- the photovoltaic battery and the energy storage battery in the energy storage system can also be used to supply power to the grid or the load.
- the energy storage battery in the energy storage system can be used to supply power to the grid or load to supplement the power supply demand.
- the control method of Figure 3 can be implemented by a controller of the power supply system.
- the power supply system includes a photovoltaic battery pack, an energy storage system, a photovoltaic inverter and a controller.
- the photovoltaic battery pack includes N photovoltaic cells, N is an integer greater than 1, and the photovoltaic battery pack is connected to the power grid or load through the photovoltaic inverter, and is stored.
- the energy system is connected in parallel with the photovoltaic battery pack, and the energy storage system is connected to the power grid or to the load through the photovoltaic inverter.
- the control method of the power supply system includes:
- the controller acquires required power of a power grid or a load.
- the controller may receive the required power of the grid or load obtained by the CT.
- the controller acquires the generated power of the photovoltaic battery.
- the controller may receive the generated power of the photovoltaic cell detected by the CT.
- Steps 301 and 302 detect power by CT. It should be understood that the controller can obtain power by other means, which is not limited in this application.
- the power generated by the photovoltaic cell is compared to the amount of power required on the grid side or the load side.
- step 303 If it is determined in step 303 that the generated power of the photovoltaic battery pack is less than the required power of the power grid or the load, the step proceeds to 304 to continue to determine whether the power generation power of the photovoltaic battery pack is zero.
- the controller controls the energy storage battery in the energy storage system to supply power to the power grid or the load.
- the power generation power of the photovoltaic battery pack is continued to be zero, and only the energy storage battery in the energy storage system can be used to supply power to the power grid or the load.
- the controller controls the energy storage battery in the photovoltaic battery group and the energy storage system to simultaneously supply power to the grid or the load.
- the photovoltaic battery pack is insufficient to provide sufficient power to supply power to the power grid or load, which may be stored by The energy storage battery in the energy system supplies power to the grid or load, and the energy storage battery discharges.
- step 303 If it is determined in step 303 that the power generated by the photovoltaic cell is not less than the required power of the grid or load, the step proceeds to 307 to continue to determine whether the power generated by the photovoltaic cell is equal to the required power of the grid or load.
- the controller controls the photovoltaic battery pack to supply power to the grid or the load.
- 303 obtains that the photovoltaic power generation power is not less than the required power of the grid or load, continue to 307 to obtain the photovoltaic power generation power equal to the required power of the grid or load, and then use the photovoltaic battery to separately supply power to the grid or load.
- the controller controls the energy storage battery in the photovoltaic cell and the energy storage system to supply power to the grid or the load at the same time. Further, the controller can control the photovoltaic battery pack to charge the energy storage battery in the energy storage system.
- 303 obtains that the photovoltaic power generation power is not less than the required power of the grid or load, continue to obtain 307 to obtain the photovoltaic power generation power is not equal to the power demand of the power grid or load, then use the photovoltaic battery pack to supply power to the grid or load, photovoltaic The battery pack power remains, and the controller can control the photovoltaic battery pack to charge the energy storage battery in the energy storage system.
- the energy storage battery in the energy storage system in the present application may be charged by the photovoltaic battery group, or may be charged by the external environment in other ways when the photovoltaic battery pack is insufficiently charged to meet the demand.
- the energy storage battery is used to supplement the power supply.
- the present application can detect the power generated by the photovoltaic cell, the required power of the grid or the load, and other parameters such as the amount of electricity, and any parameters related to the charge and discharge requirements are within the protection scope of the present application.
- the power supply system of the embodiment of the invention comprises a photovoltaic battery pack 11, an energy storage system 12, a photovoltaic inverter 13 and a controller 15, the photovoltaic battery pack comprises N photovoltaic cells, N is an integer greater than 1, and the photovoltaic battery pack passes the photovoltaic inverse
- the transformer is connected to a grid or load, and the energy storage system is connected in parallel with the photovoltaic battery pack, and the energy storage system is connected to the grid or to the load through the photovoltaic inverter.
- the controller is configured to acquire control information and control at least one of the photovoltaic battery pack and the energy storage system to supply power to the power grid or the load according to the control information.
- the power supply system in the embodiment of the present invention can be used to supply power to the power grid 14 in the grid-connected state, and can also be used to power the load 14 in the off-grid state.
- the power supply system increases the renewable energy by adding a plurality of photovoltaic cells, and arranges the energy storage system on one side of the photovoltaic battery, and controls the photovoltaic battery and/or by using the controller.
- the energy storage system supplies power to the grid or load, thereby reducing the burden on the grid, reducing reliance on the grid, and increasing the utilization of renewable energy.
- the control information in the embodiment of the present invention may be an external control signal received by the controller, such as a signal directly supplied by an external photovoltaic input battery.
- the controller can receive the control signal and control at least one of the photovoltaic battery pack and the energy storage system to supply power to the grid or load according to the control signal.
- the control signal only controls the energy storage system to be connected to the grid or the load
- the energy storage battery in the energy storage system can be used to supply power to the grid or the load.
- the control information may also be that the controller selectively uses the photovoltaic battery pack and/or the energy storage system to supply power according to the power generated by the photovoltaic battery pack and the required power of the grid or load.
- the controller can be used to obtain the required power of the power grid or the load, and obtain the power generation power of the photovoltaic battery group, control the photovoltaic battery pack and the energy storage according to the required power of the power grid or the load, and according to the power generation power of the photovoltaic battery pack. At least one of the systems supplies power to the grid or load.
- the current can be detected using a current transformer (CT), the required power of the grid can be detected using CT, or the required power of the load can be detected by the CT.
- CT can also be used to detect the power generated by the photovoltaic cell.
- the photovoltaic battery pack of the present application includes a plurality of photovoltaic cells, and the photovoltaic battery pack is connected to the load through the photovoltaic inverter.
- the photovoltaic battery pack is also connected to the energy storage battery in the energy storage system through the bidirectional DC-DC, so that When the energy storage battery supplies power to the load, the convertible power in the circuit is no longer limited, which can improve the utilization rate of the photovoltaic cell and improve the discharge efficiency.
- the energy storage system in the present application includes M energy storage batteries and M bidirectional DC/DC, wherein M energy storage batteries are connected in parallel, and M energy storage batteries are in one-to-one correspondence with M bidirectional DC/DCs, and M is positive. Integer.
- Each energy storage battery is connected to the photovoltaic battery pack through a corresponding bidirectional DC/DC, and each energy storage battery is also connected to the power grid or load through a photovoltaic inverter. In this way, by adding a plurality of energy storage batteries, when the power of the photovoltaic battery pack is still supplied to the power grid or the load remains, the power is stored in the energy storage battery, so that the power of the subsequent photovoltaic battery pack is insufficient.
- Multiple energy storage batteries result in greater storage capacity, lower requirements on the capacity of the energy storage battery, and improved light utilization.
- the photovoltaic battery controller can be used to control the energy storage battery in the energy storage system to supply power to the grid or load.
- the controller is used to control the energy storage cells in the photovoltaic cell and the energy storage system to simultaneously supply to the grid or load.
- the controller is used to disconnect the energy storage system from the photovoltaic inverter and control the photovoltaic battery pack to supply power to the grid or load.
- the controller is used to control the photovoltaic battery pack to supply power to the grid or load.
- the controller is further configured to control the photovoltaic battery pack to charge the energy storage battery in the energy storage system when the power generation power of the photovoltaic battery pack is greater than the required power of the power grid or the load.
- the controller in the power supply system in the embodiment of the present invention may perform the method in the flowcharts of FIG. 1 to FIG. 3, and to avoid repetition, details are not described herein again.
- FIG. 5 is a block schematic diagram of a power supply system in accordance with another embodiment of the present invention.
- the power supply system of FIG. 5 includes a photovoltaic battery pack composed of a plurality of PV panels, an energy storage system, a bidirectional DC-DC, a photovoltaic inverter, and a power grid.
- the photovoltaic battery pack is connected to the grid via a photovoltaic inverter.
- the energy storage system is connected to the grid through a bidirectional DC-DC, photovoltaic inverter.
- the bidirectional DC-DC circuit diagram is shown in the figure.
- Bidirectional DC-DC enables bidirectional conversion between DC high voltage and DC low voltage.
- Inductor L is used to renew the power for boost or buck.
- Switches K1, K2 are boost or buck switch controls.
- the energy storage battery in the energy storage system can supply power to the grid, and the energy storage battery discharges.
- the photovoltaic battery pack is sufficient to supply power to the grid, and when there is a surplus, the photovoltaic battery pack can also charge the energy storage battery in the energy storage system.
- FIG. 6 is a block schematic diagram of a power supply system in accordance with another embodiment of the present invention.
- Figure 6 illustrates an off-grid state in which the power supply system supplies power to the load as an example.
- the power supply system of Figure 6 includes a photovoltaic battery pack, a direct current-alternating current (DC/AC) inverter, a current sampling module, a voltage sampling module, a bidirectional DC/DC, a voltage sampling module, a voltage and current sampling module.
- the energy storage battery and battery manager, the battery manager can be the controller in Figure 4.
- the photovoltaic cell stack can be connected to the load via a DC/AC inverter.
- the current sampling module is used to collect the current on the DC side of the DC/AC inverter and transmit the sampling result to the bidirectional DC/DC to enable the output of the bidirectional DC/DC control voltage and current to meet the load usage.
- the photovoltaic battery pack is connected to the energy storage battery and battery manager via a bidirectional DC/DC.
- the voltage sampling module is used to collect the voltage of the photovoltaic battery pack and transmit the sampling result to the bidirectional DC/DC so that the bidirectional DC/DC follows the photovoltaic battery pack voltage output and protects the bidirectional DC/DC from damage due to overvoltage.
- the voltage and current acquisition module can be used to collect the current and voltage of the energy storage battery, and transmit the power value calculated according to the sampling result to the bidirectional DC/DC, so that the DC/DC is charged or discharged.
- Relay 1 is a battery relay that controls the connection of the energy storage battery to the bidirectional DC/DC.
- first and second are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.
- features defining “first” or “second” may include at least one of the features, either explicitly or implicitly.
- the meaning of "a plurality” is at least two, such as two, three, etc., unless specifically defined otherwise.
- the terms “installation”, “connected”, “connected”, “fixed” and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. , or integrated; can be mechanical or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction of two elements, unless otherwise specified Limited.
- the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.
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Abstract
本申请公开了一种供电系统和供电系统的控制方法,供电系统包括光伏电池组、储能系统、光伏逆变器和控制器,光伏电池组包括多个光伏电池,光伏电池组通过所述光伏逆变器与电网或负载连接,储能系统与光伏电池组并联连接,储能系统通过光伏逆变器与电网或与负载连接,控制方法包括:控制器获取控制信息,控制器根据控制信息控制光伏电池组和储能系统中的至少一个向电网或负载供电。这样,能够减小电网的负担,提高可再生能源的利用率。
Description
本申请要求于2017年03月30日提交中国专利局、申请号为201710202549.2、发明名称为“供电系统和供电系统的控制方法”的中国专利申请的优先权,其全部内容通过引用结合在本申请中。
本发明涉及电力电子技术领域,特别涉及供电系统的控制方法和供电系统。
随着绿色可再生能源的发展,光伏发电应运而生,但是大部分光伏发电都集中在白天,会浪费多余的光伏能量。
现有的光伏供电系统采用光伏电池(Photovoltaic,PV)通过逆变器和双向直流电-直流电(direct current-direct current,DC-DC)转换后供给电网或负载。这种方式由于逆变器的转换能力有限,且电能经过逆变器和DC-DC两次转换,光伏发电的利用率减小,发电效率降低,无法满足电网和负载侧的需求。况且,目前现有的新能源储能系统多为电网端存储,产品开发费用高,虽然能解决多余能量存储问题,但同时也增加了电网的负担和风险。
如何在减小电网负担的同时高效利用光伏发电成为现阶段光伏产业亟待解决的问题。
发明内容
本发明提出一种供电系统的控制方法和一种供电系统,能够减小电网的负担,且可以提高可再生能源的利用率。
根据本发明一方面实施例提出的供电系统的控制方法,所述供电系统包括:光伏电池组、储能系统、光伏逆变器和控制器,所述光伏电池组包括N个光伏电池,N为大于1的整数,所述光伏电池组通过所述光伏逆变器与电网或负载连接,所述储能系统与所述光伏电池组并联连接,所述储能系统通过所述光伏逆变器与所述电网或与所述负载连接,所述控制方法包括:所述控制器控制所述光伏电池组和所述储能系统中的至少一个向所述电网或所述负载供电。
根据本发明实施例提出的供电系统的控制方法,在供电系统中通过增加多个光伏电池,将可再生能源充分吸收,且将储能系统布置在光伏电池组一侧,利用控制器控制光伏电池组和/或储能系统为电网或负载供电,从而能够减小电网的负担,提高可再生能源的利用率。
根据本发明另一方面实施例提出的供电系统,所述供电系统包括:光伏电池组、储能系统、光伏逆变器和控制器,所述光伏电池组包括N个光伏电池,N为大于1的整数;所述光伏电池组通过所述光伏逆变器与电网或负载连接;所述储能系统与所述光伏电池组并 联连接,所述储能系统通过所述光伏逆变器与所述电网或与所述负载连接;所述控制器用于控制所述光伏电池组和所述储能系统中的至少一个向所述电网或所述负载供电。
根据本发明实施例提出的供电系统,供电系统中通过增加多个光伏电池,将可再生能源充分吸收,且将储能系统布置在光伏电池组一侧,利用控制器控制光伏电池组和/或储能系统为电网或负载供电,从而能够减小电网的负担,提高可再生能源的利用率。
图1是根据本发明一个实施例的供电系统的控制方法的示意性流程图;
图2是根据本发明另一实施例的供电系统的控制方法的示意性流程图;
图3是根据本发明另一个实施例的供电系统的控制方法的流程图;
图4是根据本发明一个实施例的供电系统的方框示意图;
图5是根据本发明另一实施例的供电系统的方框示意图;
图6是根据本发明另一实施例的供电系统的方框示意图。
下面详细描述本发明的实施例,所述实施例的示例在附图中示出,其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的,旨在用于解释本发明,而不能理解为对本发明的限制。
下面参照附图来描述本发明实施例的供电系统的控制方法和执行该控制方法的供电系统。
图1是根据本发明一个实施例的供电系统的控制方法的流程图。图1的方法可以由供电系统的控制器实现。供电系统包括光伏电池组、储能系统、光伏逆变器和控制器,光伏电池组包括N个光伏电池,N为大于1的整数,光伏电池组通过光伏逆变器与电网或负载连接,储能系统与光伏电池组并联连接,储能系统通过光伏逆变器与所述电网或与负载连接。
该供电系统的控制方法包括:
101,控制器获取控制信息。
102,控制器根据控制信息控制光伏电池组和储能系统中的至少一个向电网或负载供电。
根据本发明实施例提出的供电系统的控制方法,在供电系统中通过增加多个光伏电池,将可再生能源充分吸收,且将储能系统布置在光伏电池组一侧,利用控制器控制光伏电池组和/或储能系统为电网或负载供电,从而能够减小电网的负担,提高可再生能源的利用率。
在本发明的一个实施例中,控制器可以根据控制信息选择光伏电池组和储能系统中的 至少一个为电网或负载供电。控制信息可以是控制器接收的外部控制信号,例如外部直接输入的适用光伏电池组供电的信号。控制信息也可以是控制器根据光伏电池组的发电功率,以及电网或负载的需求功率,选择使用光伏电池组和/或储能系统供电。
本申请供电系统中的光伏电池组中的光伏电池数量大于1,即本申请新增了光伏电池,这样光伏电池可以充分吸收光能量,减小光能量的损失,使得光能量得到有效的利用。
本申请实施例中通过增加多个光伏电池,将光伏能量充分吸收,在满足为电网或负载供电的同时,还能够将更多的光伏电池能量存储在储能系统中,增加储能电池的储能率,在光伏电池组能量不足时为电网或负载供电,提高可再生能源的利用率。这样可以使得光伏逆变器功率一定时,增加累积发电量。
现有的供电系统方案以电网为耦合点,在电网端设置储能电池,在电网端存储电量,这样,随着用电需求量增大,电网的发电设备和用电设备装机容量会增大,需要控制的因数增多,同时电网负担也会加重,电网调控难度加大,支出费用也会相应增加。本申请储能系统与光伏电池组并联连接,将储能系统布置在光伏电池组一侧,这样能够减小电网侧的负担,降低支出。
另外,现有的供电系统离网方案中光伏电池与逆变器、DC-DC、负载依次连接进行电流电压的转换,由于逆变器本身的转换功率受限,这就限定了负载端的功率上限,不能充分满足负载高电量的需求。本申请的光伏电池组中包括多个光伏电池,且光伏电池组通过光伏逆变器与负载连接,另外,光伏电池组还通过双向DC-DC与储能系统中的储能电池连接,这样通过储能电池给负载供电时,电路中可转换的功率不再受限,能够提高光伏电池的利用率,提高放电效率。本申请的设计中,多个光伏电池共用一个光伏逆变器,相比简单地再增加一组或多组光伏电池、逆变器、DC-DC的组合设计,在满足负载电量需求的同时,还能够节省元器件数量。
本申请中的储能系统包括M个储能电池和与M个双向DC/DC,其中,M个储能电池并联,M个储能电池与M个双向DC/DC一一对应,M为正整数。每个储能电池通过对应的双向DC/DC与光伏电池组连接,每个储能电池还通过光伏逆变器与电网或负载连接。这样,通过增加多个储能电池,使得光伏电池组的电量在供给电网或负载仍有剩余时,将电量存储到储能电池中,以便后续光伏电池组电量不足时使用。多个储能电池使得存储容量更大,可以提高光利用率。
进一步地,通过增加多个储能电池,可以支撑更大功率的光伏逆变器,这样能够延长为电网或负载的供电时间。
应理解,本申请实施例可以应用于并网或离网中,对并网或离网的应用场景不做限定, 换句话说,光伏电池组和/或储能系统可以为电网供电,也可以为负载供电。
下面结合图2和图3的具体实施例详细说明为电网或负载选择合适的供电系统的方法。
图2是根据本发明另一实施例的供电系统的控制方法的示意性流程图。图2的控制方法可以由供电系统的控制器实现。供电系统包括光伏电池组、储能系统、光伏逆变器和控制器,光伏电池组包括N个光伏电池,N为大于1的整数,光伏电池组通过光伏逆变器与电网或负载连接,储能系统与光伏电池组并联连接,储能系统通过光伏逆变器与所述电网或与负载连接。
该供电系统的控制方法包括:
201,控制器接收控制信号。
控制信号可以是由控制器从外部接收的,也可以是由控制器从光伏电池组或电网或负载等接收得到的,本申请对此不作限定,只要用来控制向电网或负载供电的信号都在本申请的保护范围之内。
202,控制器根据控制信号控制光伏电池组和储能系统中的至少一个向电网或负载供电。
本申请中的电网或负载可以是单独由光伏电池组供电,例如,在太阳光能量充足,即光伏电池组的发电功率足以提供负载或电网的需求。此时,在储能系统中能量不满时,还可以控制光伏电池组向储能系统中的储能电池充电。
本申请中的电网或负载也可以单独由储能系统供电。例如,在阴雨天太阳光能量不足,且晚上光伏电池组能量耗尽时,可以单独由储能系统中的储能电池给电网或负载供电。
根据本发明实施例提出的供电系统的控制方法,在供电系统中通过增加多个光伏电池,将可再生能源充分吸收,且将储能系统布置在光伏电池组一侧,利用控制器控制光伏电池组和/或储能系统为电网或负载供电,从而能够减小电网的负担,提高可再生能源的利用率。
本申请中,也可以由光伏电池组和储能系统中的储能电池共同为电网或负载供电。例如,在阴雨天光伏电池组的能量不足以提供电网或负载所需的电量需求时,可以用储能系统中的储能电池给电网或负载供电,以补足供电需求。
下面结合图3具体说明根据发电功率和功率需求选择供电系统的具体方法。
图3是根据本发明另一个实施例的供电系统的控制方法的流程图。图3的控制方法可以由供电系统的控制器实现。供电系统包括光伏电池组、储能系统、光伏逆变器和控制器,光伏电池组包括N个光伏电池,N为大于1的整数,光伏电池组通过光伏逆变器与电网或负载连接,储能系统与光伏电池组并联连接,储能系统通过光伏逆变器与所述电网或与负载连接。
该供电系统的控制方法包括:
301,控制器获取电网或负载的需求功率。
在本发明的一个实施例中,控制器可以接收CT检测得到的电网或负载的需求功率。
302,控制器获取光伏电池组的发电功率。
在本发明的一个实施例中,控制器可以接收CT检测得到的光伏电池组的发电功率。
步骤301和302通过CT检测功率,应理解,控制器还可以通过其他方式获取功率,本申请对此不作限定。
303,光伏电池组的发电功率是否小于电网或负载的需求功率。
将光伏电池组的发电功率与电网侧或负载侧的需求功率的大小进行比较。
304,光伏电池组的发电功率是否为零。
如果步骤303判断得到光伏电池组的发电功率小于电网或负载的需求功率,步骤进行到304,继续判断光伏电池组的发电功率是否为零。
305,控制器控制储能系统中的储能电池为电网或负载供电。
如果303得到光伏电池组的发电功率小于电网或负载的需求功率,继续304得到光伏电池组的发电功率为零,这时只能使用储能系统中的储能电池向电网或负载供电。
306,控制器控制光伏电池组和储能系统中的储能电池同时向电网或负载供电。
如果303得到光伏电池组的发电功率小于电网或负载的需求功率,并且304得到光伏电池组的发电功率不为零,这时光伏电池组不足以提供足够的电量给电网或负载供电,可以由储能系统中的储能电池给电网或负载补足供电,储能电池放电。
307,光伏电池组的发电功率是否等于电网或负载的需求功率。
如果步骤303判断得到光伏电池组的发电功率不小于电网或负载的需求功率,步骤进行到307,继续判断光伏电池组的发电功率是否等于电网或负载的需求功率。
308,控制器控制光伏电池组向电网或负载供电。
如果303得到光伏电池组的发电功率不小于电网或负载的需求功率,继续307得到光伏电池组的发电功率等于电网或负载的需求功率,这时使用光伏电池组单独向电网或负载供电。
309,控制器控制光伏电池和储能系统中的储能电池同时向电网或负载供电。进一步地,控制器可控制光伏电池组给储能系统中的储能电池充电。
如果303得到光伏电池组的发电功率不小于电网或负载的需求功率,继续307得到光伏电池组的发电功率不等于电网或负载的需求功率,这时使用光伏电池组供向电网或负载供电,光伏电池组功率仍有剩余,控制器可控制光伏电池组给储能系统中的储能电池充电。
应理解,本申请中的储能系统中的储能电池可以是由光伏电池组充电的,也可以是在光伏电池组充电不足以满足需求时,采用外界其他的方式给储能电池充电,以备光伏电池组给负载或电网供电不足时,采用储能电池补足供电。
应理解,本申请可以检测光伏电池组的发电功率,电网或负载的需求功率,也可以检测电量等其他参量,凡是与充放电需求有关的参量都在本申请的保护范围之内。
上文结合图1至图3详细说明了本申请实施例的供电系统对应的控制方法的示意性流程图,下面结合图4至图6详细说明本申请实施例的供电系统的示意性框图。
图4是根据本发明一个实施例的供电系统的示意性框图。本发明实施例的供电系统包括光伏电池组11、储能系统12、光伏逆变器13和控制器15,光伏电池组包括N个光伏电池,N为大于1的整数,光伏电池组通过光伏逆变器与电网或负载连接,所述储能系统与光伏电池组并联连接,储能系统通过光伏逆变器与电网或与负载连接。控制器用于获取控制信息,并根据控制信息控制光伏电池组和所述储能系统中的至少一个向所述电网或所述负载供电。
本发明实施例中的供电系统可以在并网状态下用来给电网14供电,也可用在离网状态下给负载14供电。
根据本发明实施例提出的供电系统,供电系统中通过增加多个光伏电池,将可再生能源充分吸收,且将储能系统布置在光伏电池组一侧,利用控制器控制光伏电池组和/或储能系统为电网或负载供电,从而能够减小电网的负担,减少对电网的依赖,提高可再生能源的利用率。
本发明实施例中的控制信息可以是控制器接收的外部控制信号,例如外部直接输入的适用光伏电池组供电的信号。此时控制器可以接收控制信号,并根据控制信号控制光伏电池组和储能系统中的至少一个向电网或负载供电。例如,控制信号只控制储能系统与电网或负载接通时,可以利用储能系统中的储能电池给电网或负载供电。
控制信息也可以是控制器根据光伏电池组的发电功率,以及电网或负载的需求功率,选择使用光伏电池组和/或储能系统供电。此时控制器可以用于获取电网或负载的需求功率,并获取光伏电池组的发电功率,根据电网或所述负载的需求功率,以及根据光伏电池组的发电功率,控制光伏电池组和储能系统中的至少一个向电网或负载供电。
在本发明的一个实施例中,可以利用电流互感器(Current transformer,CT)检测功率,利用CT检测电网的需求功率,或CT可以检测负载的需求功率。另外,CT还可以用来检测光伏电池组的发电功率。
另外,现有的供电系统离网方案中光伏电池与逆变器、DC-DC、负载依次连接进行电 流电压的转换,由于逆变器本身的转换功率受限,这就限定了负载端的功率上限,不能充分满足负载需求。本申请的光伏电池组中包括多个光伏电池,且光伏电池组通过光伏逆变器与负载连接,另外,光伏电池组还通过双向DC-DC与储能系统中的储能电池连接,这样通过储能电池给负载供电时,电路中可转换的功率不再受限,能够提高光伏电池的利用率,提高放电效率。
本申请中的储能系统包括M个储能电池和与M个双向DC/DC,其中,M个储能电池并联,M个储能电池与M个双向DC/DC一一对应,M为正整数。每个储能电池通过对应的双向DC/DC与光伏电池组连接,每个储能电池还通过光伏逆变器与电网或负载连接。这样,通过增加多个储能电池,使得光伏电池组的电量在供给电网或负载仍有剩余时,将电量存储到储能电池中,以便后续光伏电池组电量不足时使用。多个储能电池使得存储容量更大,降低对储能电池的容量的要求,还可以提高光利用率。
在本发明的一个实施例中,如果光伏电池的发电功率为零,光伏电池组控制器可以用于控制储能系统中的储能电池向电网或负载供电。
如果光伏电池组的发电功率不为零,且光伏电池组的发电功率小于电网或负载的需求功率,控制器用于控制光伏电池组和储能系统中的储能电池同时向电网或负载供。
如果光伏电池组的发电功率等于电网或负载的需求功率,控制器用于断开储能系统和光伏逆变器之间的连接,并控制光伏电池组向电网或负载供电。
如果光伏电池组的发电功率大于电网或负载的需求功率,控制器用于控制光伏电池组向电网或负载供电。另外,控制器还用于在光伏电池组的发电功率大于电网或负载的需求功率时,控制光伏电池组给储能系统中的储能电池充电。
本发明实施例中的供电系统中的控制器可以执行图1至图3流程图中的方法,为避免重复,在此不再一一赘述。
图5是根据本发明另一实施例的供电系统的方框示意图。
这里以并网为例进行示例性说明。图5的供电系统包括多个PV电池板组成的光伏电池组、储能系统、双向DC-DC、光伏逆变器、电网。光伏电池组通过光伏逆变器与电网连接。储能系统通过双向DC-DC、光伏逆变器与电网连接。双向DC-DC电路图如图所示。双向DC-DC可以实现直流高压-直流低压之间的双向转换。电感L用于为升压或降压续存电能。开关K1、K2为升压或降压开关控制。在光伏电池组电量不足以提供给电网供电时,储能系统中的储能电池可以给电网补足供电,储能电池放电。光伏电池组电量足以提供给电网供电,且有剩余时,光伏电池组还可以给储能系统中的储能电池充电。
图6是根据本发明另一实施例的供电系统的方框示意图。图6以供电系统给负载供电 的离网状态为例进行说明。图6的供电系统包括光伏电池组、直流-交流(Direct Current-Alternating Current,DC/AC)逆变器、电流采样模块、电压采样模块、双向DC/DC、电压采样模块、电压和电流采样模块、储能电池和电池管理器,电池管理器可以为图4中的控制器。
光伏电池组可以通过DC/AC逆变器与负载连接。电流采样模块用于采集DC/AC逆变器直流侧的电流,并向双向DC/DC传输采样结果,以使的双向DC/DC控制电压和电流的输出,满足负载使用。光伏电池组通过双向DC/DC与储能电池和电池管理器连接。电压采样模块用于采集光伏电池组的电压,并向双向DC/DC传输采样结果,以使的双向DC/DC跟随光伏电池组电压输出,并保护双向DC/DC因过压导致损坏。电压和电流采集模块可以用来采集储能电池的电流和电压,将根据采样结果计算的功率值传输给双向DC/DC,以使的DC/DC来充电或放电。Relay 1是电池继电器,用于控制储能电池与双向DC/DC的连接。
此外,术语“第一”、“第二”仅用于描述目的,而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此,限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。在本发明的描述中,“多个”的含义是至少两个,例如两个,三个等,除非另有明确具体的限定。
在本发明中,除非另有明确的规定和限定,术语“安装”、“相连”、“连接”、“固定”等术语应做广义理解,例如,可以是固定连接,也可以是可拆卸连接,或成一体;可以是机械连接,也可以是电连接;可以是直接相连,也可以通过中间媒介间接相连,可以是两个元件内部的连通或两个元件的相互作用关系,除非另有明确的限定。对于本领域的普通技术人员而言,可以根据具体情况理解上述术语在本发明中的具体含义。
在本说明书的描述中,参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施例或示例中。在本说明书中,对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且,描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外,在不相互矛盾的情况下,本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。
尽管上面已经示出和描述了本发明的实施例,可以理解的是,上述实施例是示例性的,不能理解为对本发明的限制,本领域的普通技术人员在本发明的范围内可以对上述实施例进行变化、修改、替换和变型。
Claims (14)
- 一种供电系统的控制方法,其特征在于,所述供电系统包括:光伏电池组、储能系统、光伏逆变器和控制器,所述光伏电池组包括N个光伏电池,N为大于1的整数,所述光伏电池组通过所述光伏逆变器与电网或负载连接,所述储能系统与所述光伏电池组并联连接,所述储能系统通过所述光伏逆变器与所述电网或与所述负载连接;所述控制方法包括:所述控制器获取控制信息;所述控制器根据所述控制信息控制所述光伏电池组和所述储能系统中的至少一个向所述电网或所述负载供电。
- 如权利要求1所述的控制方法,其特征在于,所述储能系统包括M个储能电池和M个双向DC/DC,所述M个储能电池并联,所述M个储能电池与所述M个双向DC/DC一一对应,M为正整数,每个储能电池通过对应的所述双向DC/DC与所述光伏电池组连接,每个储能电池还通过所述光伏逆变器与所述电网或所述负载连接。
- 如权利要求1或2所述的供电系统的控制方法,其特征在于,所述控制信息为控制信号,其中,所述控制器获取控制信息包括:所述控制器接收控制信号;所述控制器根据所述控制信息控制所述光伏电池组和所述储能系统中的至少一个向所述电网或所述负载供电包括:所述控制器根据所述控制信号控制所述光伏电池组和所述储能系统中的至少一个向所述电网或所述负载供电。
- 如权利要求1至3中任意一项所述的控制方法,其特征在于,所述控制器获取控制信息包括:所述控制器获取所述电网或所述负载的需求功率;所述控制器获取所述光伏电池组的发电功率;其中,所述控制器根据所述控制信息控制所述光伏电池组和所述储能系统中的至少一个向所述电网或所述负载供电包括:所述控制器根据所述电网或所述负载的需求功率,以及根据所述光伏电池组的发电功率,控制所述光伏电池组和所述储能系统中的至少一个向所述电网或所述负载供电。
- 如权利要求1至4中任意一项所述的控制方法,其特征在于,所述供电系统还包括电流互感器CT,其中,所述控制器获取所述电网或所述负载的需求功率包括:所述控制器接收所述CT检测得到的所述电网或所述负载的需求功率;所述控制器获取所述光伏电池组的发电功率包括:控制器接收所述CT检测得到的所述光伏电池组的发电功率。
- 如权利要求4或5所述的控制方法,其特征在于,所述方法还包括:在所述光伏电池组的发电功率大于所述电网或所述负载的需求功率时,控制所述光伏电池组给所述储能系统中的储能电池充电。
- 如权利要求4或5所述的控制方法,其特征在于,所述方法还包括:如果所述光伏电池组的发电功率为零,所述控制器控制所述储能系统中的储能电池向所述电网或所述负载供电;如果所述光伏电池组的发电功率不为零,且所述光伏电池组的功率小于所述电网或所述负载的需求功率,所述控制器控制所述光伏电池组和所述储能系统中的储能电池同时向所述电网或所述负载供电;如果所述光伏电池组的发电功率等于所述电网或所述负载的需求功率,所述控制器断开所述储能系统和所述光伏逆变器之间的连接,并控制所述光伏电池组向所述电网或所述负载供电。如果所述光伏电池组的发电功率大于所述电网或所述负载的需求功率,所述控制器控制所述光伏电池组向所述电网或所述负载供电。
- 一种供电系统,其特征在于,所述供电系统包括:光伏电池组、储能系统、光伏逆变器和控制器,所述光伏电池组包括N个光伏电池,N为大于1的整数;所述光伏电池组通过所述光伏逆变器与电网或负载连接;所述储能系统与所述光伏电池组并联连接,所述储能系统通过所述光伏逆变器与所述电网或与所述负载连接;所述控制器用于获取控制信息,并根据所述控制信息控制所述光伏电池组和所述储能系统中的至少一个向所述电网或所述负载供电。
- 如权利要求8所述的供电系统,其特征在于,所述储能系统包括M个储能电池和M个双向DC/DC,所述M个储能电池并联,所述M个储能电池与所述M个双向DC/DC一一对应,M为正整数,每个储能电池通过对应的所述双向DC/DC与所述光伏电池组连 接,每个储能电池还通过所述光伏逆变器与所述电网或所述负载连接。
- 如权利要求8或9所述的供电系统,其特征在于,所述控制信息为控制信号,所述控制器用于获取控制信息,并根据所述控制信息控制所述光伏电池组和所述储能系统中的至少一个向所述电网或所述负载供电包括:所述控制器接收控制信号,并根据所述控制信号控制所述光伏电池组和所述储能系统中的至少一个向所述电网或所述负载供电。
- 如权利要求8至10中任意一项所述的供电系统,其特征在于,所述控制器还用于获取所述电网或所述负载的需求功率,并获取所述光伏电池组的发电功率,根据所述电网或所述负载的需求功率,以及根据所述光伏电池组的发电功率,控制所述光伏电池组和所述储能系统中的至少一个向所述电网或所述负载供电。
- 如权利要求11所述的供电系统,其特征在于,所述供电系统还包括CT,所述CT用于检测所述电网或所述负载的需求功率,所述CT还用于检测所述光伏电池组的发电功率。
- 如权利要求11或12所述的供电系统,其特征在于,所述控制器还用于在所述光伏电池组的发电功率大于所述电网或所述负载的需求功率时,控制所述光伏电池组给所述储能系统中的储能电池充电。
- 如权利要求11或12所述的供电系统,其特征在于,如果所述光伏电池组的发电功率为零,所述控制器用于控制所述储能系统中的储能电池向所述电网或所述负载供电;如果所述光伏电池组的发电功率不为零,且所述光伏电池组的功率小于所述电网或所述负载的需求功率,所述控制器用于控制所述光伏电池组和所述储能系统中的储能电池同时向所述电网或所述负载供电;如果所述光伏电池组的发电功率等于所述电网或所述负载的需求功率,所述控制器用于断开所述储能系统和所述光伏逆变器之间的连接,并控制所述光伏电池组向所述电网或所述负载供电;如果所述光伏电池组的发电功率大于所述电网或所述负载的需求功率,所述控制器用于控制所述光伏电池组向所述电网或所述负载供电。
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