WO2018177062A1

WO2018177062A1 - Power supply system and control method for power supply system

Info

Publication number: WO2018177062A1
Application number: PCT/CN2018/077537
Authority: WO
Inventors: 尹韶文; 孙嘉品; 李程
Original assignee: 比亚迪股份有限公司
Priority date: 2017-03-30
Filing date: 2018-02-28
Publication date: 2018-10-04
Also published as: CN108667114A

Abstract

Disclosed are a power supply system and a control method for a power supply system. The power supply system comprises a photovoltaic battery pack, an energy storage system, a photovoltaic inverter and a controller, wherein the photovoltaic battery pack comprises a plurality of photovoltaic cells, the photovoltaic battery pack is connected to a grid or a load through the photovoltaic inverter, the energy storage system and the photovoltaic battery pack are connected in parallel, and the energy storage system is connected to the grid or the load through the photovoltaic inverter. The control method comprises: the controller acquiring control information, and the controller controlling, according to the control information, at least one of the photovoltaic battery pack and the energy storage system to power the grid or the load. In this way, the burden of the grid can be reduced, and the utilization rate of renewable energy is improved.

Description

Power supply system and control method of power supply system

This application claims the priority of the Chinese Patent Application, filed on March 30, 2017, the application Serial No. in.

Technical field

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.

Background technique

With the development of green renewable energy, photovoltaic power generation came into being, but most of the photovoltaic power generation is concentrated in the daytime, which will waste excess photovoltaic energy.

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. In this way, due to the limited conversion capability of the inverter and the two-time conversion of the electric energy through the inverter and the DC-DC, the utilization rate of the photovoltaic power generation is reduced, and the power generation efficiency is lowered, which cannot meet the requirements of the power grid and the load side. Moreover, 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.

How to effectively use photovoltaic power generation while reducing the burden on the grid has become an urgent problem to be solved in the current PV industry.

Summary of the invention

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.

According to an embodiment of the present invention, 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.

According to the control method of the power supply system according to the embodiment of the present invention, 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.

According to another aspect of the present invention, 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.

According to the power supply system of the embodiment of the present invention, 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.

DRAWINGS

1 is a schematic flow chart of a control method of a power supply system according to an embodiment of the present invention;

2 is a schematic flowchart of a control method of a power supply system according to another embodiment of the present invention;

3 is a flow chart of a control method of a power supply system according to another embodiment of the present invention;

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.

detailed description

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.

A control method of a power supply system and a power supply system for executing the same according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

1 is a flow chart of a method of controlling a power supply system in accordance with one embodiment of the present invention. The method of Figure 1 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:

101. The controller acquires control information.

102. 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.

In one embodiment of the invention, 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.

In the embodiment of the present application, by adding a plurality of photovoltaic cells, 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. Thus, as the power demand increases, 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.

In addition, in the existing power supply system off-grid scheme, the photovoltaic cell and the inverter, the DC-DC, and the load are sequentially connected to perform current-voltage conversion. Since the conversion power of the inverter itself is limited, this limits the power limit of the load end. , can not fully meet the demand for high power load. 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. In addition, 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. In the design of the present application, 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.

Further, by adding a plurality of energy storage batteries, it is possible to support a photovoltaic inverter of a higher power, which can extend the power supply time to the grid or the load.

It should be understood that 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. In other words, the photovoltaic battery and/or the energy storage system may supply power to the grid. Power the load.

A method of selecting a suitable power supply system for a power grid or load is described in detail below in conjunction with the specific embodiments of FIGS. 2 and 3.

2 is a schematic flow chart of a control method of a power supply system according to another embodiment of the present invention. 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:

201. 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.

202. 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. At this time, when the energy in the energy storage system is not full, 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. For example, when the solar energy is insufficient in rainy days and the photovoltaic cells are exhausted at night, the energy storage battery in the energy storage system can be used to supply power to the grid or load.

In the present application, 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. For example, when the energy of the photovoltaic battery pack is insufficient to provide the power demand of the grid or load on a rainy day, 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.

A specific method for selecting a power supply system according to power generation power and power demand will be specifically described below with reference to FIG.

3 is a flow chart of a method of controlling a power supply system in accordance with another embodiment of the present invention. 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:

301. The controller acquires required power of a power grid or a load.

In one embodiment of the invention, the controller may receive the required power of the grid or load obtained by the CT.

302. The controller acquires the generated power of the photovoltaic battery.

In an embodiment of the invention, 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.

303. Whether the power generated by the photovoltaic battery pack is less than the required power of the power grid or the load.

The power generated by the photovoltaic cell is compared to the amount of power required on the grid side or the load side.

304, whether the photovoltaic power generation power is zero.

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.

305. The controller controls the energy storage battery in the energy storage system to supply power to the power grid or the load.

If 303 obtains that the photovoltaic power generation power of the photovoltaic battery pack is less than the required power of 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.

306. 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.

If 303 obtains that the photovoltaic power generation power of the photovoltaic battery pack is less than the required power of the power grid or load, and 304 obtains that the photovoltaic power generation power of the photovoltaic battery pack is not zero, then 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.

307, whether the power generated by the photovoltaic battery pack is equal to the required power of the power grid or the load.

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.

308. The controller controls the photovoltaic battery pack to supply power to the grid or the load.

If 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.

309. 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.

If 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.

It should be understood that 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. When the PV battery pack is insufficient for power supply to the load or the grid, the energy storage battery is used to supplement the power supply.

It should be understood that 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.

A schematic flowchart of a power supply system according to an embodiment of the present application is described in detail below with reference to FIG. 1 to FIG.

4 is a schematic block diagram of a power supply system in accordance with one embodiment of the present invention. 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.

According to the power supply system of the embodiment of the present invention, 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. At this point, 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. For example, when 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. At this time, 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.

In one embodiment of the invention, 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. In addition, CT can also be used to detect the power generated by the photovoltaic cell.

In addition, in the existing power supply system off-grid scheme, the photovoltaic cell and the inverter, the DC-DC, and the load are sequentially connected to perform current-voltage conversion. Since the conversion power of the inverter itself is limited, this limits the power limit of the load end. , can not fully meet the load demand. 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. In addition, 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.

In one embodiment of the invention, if the photovoltaic cell's power generation is zero, 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.

If the power generation of the photovoltaic cell is not zero, and the power generated by the photovoltaic cell is less than the required power of 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.

If the power generated by the photovoltaic cell is equal to the required power of 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.

If the photovoltaic power generation power is greater than the required power of the grid or load, the controller is used to control the photovoltaic battery pack to supply power to the grid or load. In addition, 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.

Figure 5 is a block schematic diagram of a power supply system in accordance with another embodiment of the present invention.

Here, an example of the connection is taken as an example. 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. When the photovoltaic battery pack is not enough to supply power to the grid, 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.

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.

Moreover, the terms "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. Thus, features defining "first" or "second" may include at least one of the features, either explicitly or implicitly. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless specifically defined otherwise.

In the present invention, 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. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. A structure, material or feature is included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms is not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, various embodiments or examples described in the specification, as well as features of various embodiments or examples, may be combined and combined.

Although the embodiments of the present invention have been shown and described, it is understood that the above-described embodiments are illustrative and are not to be construed as limiting the scope of the invention. The embodiments are subject to variations, modifications, substitutions and variations.

Claims

A control method for a power supply system, wherein the power supply system comprises: 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. Integral, the photovoltaic battery is connected to the grid or load through the photovoltaic inverter, the energy storage system is connected in parallel with the photovoltaic battery, and the energy storage system passes through the photovoltaic inverter and the power grid Or connected to the load;

The control method 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 power grid or the load according to the control information.
The control method according to claim 1, wherein said energy storage system comprises M energy storage batteries and M bidirectional DC/DCs, said M energy storage batteries being connected in parallel, said M energy storage batteries and The M bidirectional DC/DCs are in one-to-one correspondence, and M is a positive integer. Each energy storage battery is connected to the photovoltaic battery group through the corresponding bidirectional DC/DC, and each energy storage battery also passes through the photovoltaic reverse A transformer is coupled to the grid or the load.
The control method of a power supply system according to claim 1 or 2, wherein the control information is a control signal,

among them,

The controller acquiring control information includes:

The controller receives a control signal;

And controlling, by the controller, the at least one of the photovoltaic battery group and the energy storage system to supply power to the power grid or the load according to the control information includes:

The controller controls at least one of the photovoltaic battery pack and the energy storage system to supply power to the electrical grid or the load in accordance with the control signal.
The control method according to any one of claims 1 to 3, wherein the controller acquiring control information comprises:

The controller acquires required power of the power grid or the load;

The controller acquires a power generation power of the photovoltaic battery group;

among them,

And controlling, by the controller, the at least one of the photovoltaic battery group and the energy storage system to supply power to the power grid or the load according to the control information includes:

The controller controls at least one of the photovoltaic battery group and the energy storage system to the power grid or according to a required power of the power grid or the load, and according to a power generation power of the photovoltaic battery group Load power supply.
The control method according to any one of claims 1 to 4, wherein the power supply system further comprises a current transformer CT,

among them,

The controller acquiring the required power of the power grid or the load includes: the controller receiving the required power of the power grid or the load obtained by the CT detection;

The controller acquiring the generated power of the photovoltaic battery group includes: the controller receiving the generated power of the photovoltaic battery group obtained by the CT detection.
The control method according to claim 4 or 5, wherein the method further comprises:

The photovoltaic battery pack is controlled 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 control method according to claim 4 or 5, wherein the method further comprises:

If the power generation power of the photovoltaic battery pack is zero, the controller controls an energy storage battery in the energy storage system to supply power to the power grid or the load;

The controller controls the photovoltaic battery group and the energy storage system if the power generation power of the photovoltaic battery group is not zero, and the power of the photovoltaic battery group is less than the required power of the power grid or the load The energy storage battery simultaneously supplies power to the power grid or the load;

If the power generation power of the photovoltaic battery pack is equal to the required power of the power grid or the load, the controller disconnects the energy storage system and the photovoltaic inverter, and controls the photovoltaic battery The group supplies power to the grid or the load.

The controller controls the photovoltaic battery pack to supply power to the electrical grid or the load if the generated power of the photovoltaic battery pack is greater than the required power of the electrical grid or the load.
A power supply system, comprising: 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 one;

The photovoltaic battery pack is connected to a power grid or a load through the photovoltaic inverter;

The energy storage system is connected in parallel with the photovoltaic battery group, and the energy storage system is connected to the power grid or the load through the photovoltaic inverter;

The controller is configured to acquire control information, and control at least one of the photovoltaic battery group and the energy storage system to supply power to the power grid or the load according to the control information.
The power supply system according to claim 8, wherein said energy storage system comprises M energy storage batteries and M bidirectional DC/DCs, said M energy storage batteries being connected in parallel, said M energy storage batteries and The M bidirectional DC/DCs are in one-to-one correspondence, and M is a positive integer. Each energy storage battery is connected to the photovoltaic battery group through the corresponding bidirectional DC/DC, and each energy storage battery also passes through the photovoltaic reverse A transformer is coupled to the grid or the load.
The power supply system according to claim 8 or 9, wherein said control information is a control signal, said controller is configured to acquire control information, and control said photovoltaic battery pack and said energy storage according to said control information At least one of the systems supplying power to the grid or the load includes:

The controller receives a control signal and controls at least one of the photovoltaic battery pack and the energy storage system to supply power to the electrical grid or the load in accordance with the control signal.
The power supply system according to any one of claims 8 to 10, wherein the controller is further configured to acquire required power of the power grid or the load, and acquire power generated by the photovoltaic battery pack, At least one of the photovoltaic battery pack and the energy storage system is controlled to supply power to the electrical grid or the load based on the required power of the electrical grid or the load, and according to the generated power of the photovoltaic battery.
The power supply system according to claim 11, wherein said power supply system further comprises a CT for detecting a required power of said power grid or said load, said CT being further for detecting said photovoltaic battery The group's power generation.
The power supply system according to claim 11 or 12, wherein the controller is further configured to control the photovoltaic cell when a power generation power of the photovoltaic battery pack is greater than a required power of the power grid or the load The group charges the energy storage battery in the energy storage system.
A power supply system according to claim 11 or 12, wherein

If the power generation power of the photovoltaic battery pack is zero, the controller is configured to control an energy storage battery in the energy storage system to supply power to the power grid or the load;

The controller is configured to control the photovoltaic battery group and the energy storage system if a power generation power of the photovoltaic battery group is not zero, and a power of the photovoltaic battery group is less than a required power of the power grid or the load The energy storage battery in the same time supplies power to the power grid or the load;

If the power generation power of the photovoltaic battery pack is equal to the required power of the power grid or the load, the controller is configured to disconnect the energy storage system and the photovoltaic inverter, and control the photovoltaic The battery pack supplies power to the power grid or the load;

The controller is configured to control the photovoltaic battery pack to supply power to the electrical grid or the load if the generated power of the photovoltaic battery pack is greater than the required power of the electrical grid or the load.