Optical storage hybrid topological structure and control method

Abstract

The invention discloses an optical storage hybrid topological structure and a control method. The optical storage hybrid topological structure is characterized in that an energy storage battery pack is electrically connected with a power distribution network through an energy storage converter; the photovoltaic module is electrically connected with a power distribution network through a photovoltaic inverter, and an electric control switch is arranged on a circuit between the photovoltaic module and the photovoltaic inverter; one end of the electrical switch is electrically connected to a circuit between the energy storage converter and the energy storage battery pack; the other end of the electric switch is electrically connected to a circuit between the photovoltaic inverter and the electric control switch # imgabs0 #; the photovoltaic power prediction module calculates and obtains photovoltaic prediction power according to meteorological data obtained in real time and sends the photovoltaic prediction power to the controller; the controller controls the electric control switch and the electric switch to act according to the photovoltaic predicted power; the attenuation power of the photovoltaic cell is supplemented by energy storage, so that the light storage system can stably supply power to the load in the whole life cycle.

Description

Technical Field

[0001] The present invention belongs to the field of photovoltaic energy storage, and particularly relates to a hybrid photovoltaic-storage topology and a control method. Background Art

[0002] With the advancement of global energy transformation and sustainable development, the importance of renewable energy has become increasingly prominent. As a clean and renewable form of energy utilization, large-scale application of photovoltaic power generation is of crucial significance for optimizing the energy structure and reducing carbon emissions. However, photovoltaic power generation is affected by factors such as weather conditions and day-night alternation, and has volatility and intermittency. Moreover, the peak period of photovoltaic power generation often does not coincide with the peak period of electricity load, which poses challenges to the stable operation of the power grid and the continuity of power supply, and may lead to problems such as power grid frequency fluctuations, voltage instability, and curtailment of photovoltaic power.

[0003] The development of energy storage technology provides a new way to solve these problems. The energy storage system can store the excess electric energy generated by photovoltaic power generation and release it when needed, effectively improving the energy utilization efficiency and enhancing the stability of the power grid at the same time. At present, the energy storage-photovoltaic hybrid system has received extensive attention in the energy field. However, the existing technologies cannot fully consider the attenuation characteristics of photovoltaic cells and the optimization of power distribution under different working conditions. This not only limits the performance of the system in the whole life cycle, but also affects the service life and overall economy of the energy storage system. Summary of the Invention

[0004] The present invention provides a hybrid photovoltaic-storage topology and a control method, which use energy storage to supplement the attenuated power of photovoltaic cells to ensure that the hybrid photovoltaic-storage system can stably supply power to the load throughout its life cycle.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] In the first aspect of the present invention, a hybrid photovoltaic-storage topology is provided, which includes a photovoltaic power prediction module, a photovoltaic unit, and an energy storage unit;

[0007] The energy storage unit includes an energy storage converter and an energy storage battery pack. The energy storage battery pack is electrically connected to the distribution network through the energy storage converter; the photovoltaic unit includes a photovoltaic panel and a photovoltaic inverter. The photovoltaic panel is electrically connected to the distribution network through the photovoltaic inverter, and an electric control switch is provided on the circuit between the photovoltaic panel and the photovoltaic inverter ;

[0008] An electrical switch One end is electrically connected to the circuit between the energy storage converter and the energy storage battery pack; the electrical switch The other end is electrically connected to the circuit between the photovoltaic inverter and the electric control switch ;

[0009] The photovoltaic power prediction module and the electric control switch 's control port and the electric switch 's control port are electrically connected to the controller;

[0010] The photovoltaic power prediction module calculates the photovoltaic predicted power based on the real-time acquired meteorological data and sends it to the controller; the controller controls the electric control switch and the electric switch to act.

[0011] Furthermore, a number of photovoltaic units are electrically connected to the distribution network. The first photovoltaic unit is electrically connected to the energy storage unit through an electric switch . Adjacent two photovoltaic units are electrically connected through an electric switch , , where j is the serial number of the photovoltaic unit and N is the number of photovoltaic units; the control port of the electric switch is electrically connected to the controller.

[0012] Furthermore, one end of the electric switch is connected to the circuit between the photovoltaic and the photovoltaic inverter in the th photovoltaic unit, and the other end of the electric switch is connected to the circuit between the photovoltaic and the photovoltaic inverter in the th photovoltaic unit.

[0013] Furthermore, a bidirectional DC / DC module is provided between the energy storage battery pack and the electric switch . The input end of the bidirectional DC / DC module is electrically connected to the circuit between the energy storage converter and the energy storage battery pack; the output end of the bidirectional DC / DC module is electrically connected to the electric switch .

[0014] Furthermore, the energy storage battery pack is electrically connected to the controller. The controller obtains the energy storage state of the energy storage battery pack and controls the electric control switch and the electric switch to act according to the photovoltaic predicted power and the energy storage state.

[0015] Furthermore, a number of energy storage units are electrically connected to the distribution network, and the energy storage units are arranged in one-to-one correspondence with the bidirectional DC / DC modules.

[0016] The second aspect of the present invention provides a control method for a hybrid photovoltaic and energy storage topology, including:

[0017] Obtain meteorological data and input it into the photovoltaic power prediction module to obtain the photovoltaic predicted power, and send the photovoltaic predicted power to the controller,

[0018] Control the electric control switch according to the predicted photovoltaic power and the electrical switch to actuate

[0019] Furthermore, control the electric control switch and the electrical switch to actuate, specifically including:

[0020] When the predicted photovoltaic power is greater than the first power threshold , control the electric control switch to actuate and conduct the circuit between the photovoltaic and the photovoltaic inverter, and control the electrical switch to actuate and disconnect the circuit between the photovoltaic unit and the energy storage unit;

[0021] When the value of the predicted photovoltaic power is between the first power threshold and the second power threshold , control the electric control switch to actuate and conduct the circuit between the photovoltaic and the photovoltaic inverter, and control the electrical switch to actuate and conduct the circuit between the photovoltaic unit and the energy storage unit; Use the output power of the energy storage unit to supplement the attenuation power of the photovoltaic unit;

[0022] When the predicted photovoltaic power is less than the first power threshold , control the electric control switch to actuate and disconnect the circuit between the photovoltaic and the photovoltaic inverter, and control the electrical switch to actuate and conduct the circuit between the photovoltaic unit and the energy storage unit, and use the output power of the energy storage unit to replace the output power of the photovoltaic unit.

[0023] Furthermore, a bidirectional DC / DC module is provided between the energy storage battery pack and the electrical switch . The input end of the bidirectional DC / DC module is electrically connected to the circuit between the energy storage converter and the energy storage battery pack; The output end of the bidirectional DC / DC module is electrically connected to the electrical switch ;

[0024] Obtain the energy storage state of the energy storage battery pack, and control the electric control switch and the electrical switch to actuate according to the predicted photovoltaic power and the energy storage state, specifically including:

[0025] When the predicted photovoltaic power is greater than the first power threshold , and the energy storage state of the energy storage battery pack is less than the energy storage threshold, control the electric control switch to actuate and conduct the circuit between the photovoltaic and the photovoltaic inverter, and control the electrical switch The circuit between the photovoltaic unit and the energy storage unit is turned on; the output power of the photovoltaic unit is used to supply power to the distribution network and charge the energy storage unit.

[0026] Furthermore, the output power of the energy storage unit is used to supplement the attenuated power of the photovoltaic unit, specifically including:

[0027]

[0028] In the formula, is the load power; is the total output power of each photovoltaic unit; is the power of the bidirectional DC / DC module; is the maximum instantaneous power of the energy storage unit.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] The electrical switch of the present invention One end is electrically connected to the circuit between the energy storage converter and the energy storage battery pack; the electrical switch The other end is electrically connected to the circuit between the photovoltaic inverter and the electric control switch ; the photovoltaic power prediction module calculates the predicted photovoltaic power based on the real-time acquired meteorological data and sends it to the controller; the controller controls the electric control switch and the electrical switch to act; when a fault occurs in the photovoltaic array or the power generation is insufficient, the photovoltaic inverter takes power from both the photovoltaic and the energy storage battery at the same time, avoiding power outages caused by single energy supply problems, and enhancing the fault tolerance and reliability of the system.

[0031] When the value of the predicted photovoltaic power of the present invention is between the first power threshold and the second power threshold , control the electric control switch to act to turn on the circuit between the photovoltaic and the photovoltaic inverter, control the electrical switch to act to turn on the circuit between the photovoltaic unit and the energy storage unit; use the energy storage to supplement the attenuated power of the photovoltaic battery, ensure that the photovoltaic-storage system can stably supply power to the load throughout the life cycle, and extend the effective service life of the system. Description of the Drawings

[0032] Figure 1 is the circuit diagram of the photovoltaic-storage hybrid topology structure provided by Embodiment 1 of the present invention;

[0033] Figure 2 is the circuit diagram of the photovoltaic-storage hybrid topology structure provided by Embodiment 2 of the present invention;

[0034] Figure 3It is the circuit diagram of the optical storage hybrid topology provided by Embodiment 3 of the present invention;

[0035] Figure 4 It is the circuit diagram of the optical storage hybrid topology provided by Embodiment 4 of the present invention;

[0036] Figure 5 It is the control flow chart of the optical storage hybrid topology provided by Embodiment 5 of the present invention. Detailed implementation manners

[0037] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and cannot be used to limit the protection scope of the present invention.

[0038] Embodiment 1

[0039] As Figure 1 shown, this embodiment provides an optical storage hybrid topology, including: a photovoltaic power prediction module, a photovoltaic unit, and an energy storage unit;

[0040] The energy storage unit includes an energy storage converter and an energy storage battery pack. The energy storage battery pack is electrically connected to the distribution network through the energy storage converter; the photovoltaic unit includes a photovoltaic and a photovoltaic inverter. The photovoltaic is electrically connected to the distribution network through the photovoltaic inverter, and an electric control switch is provided on the circuit between the photovoltaic and the photovoltaic inverter ;

[0041] An electrical switch is electrically connected to the circuit between the energy storage converter and the energy storage battery pack at one end; the electrical switch is electrically connected to the circuit between the photovoltaic inverter and the electric control switch at the other end;

[0042] The control ports of the photovoltaic power prediction module, the electric control switch , and the electrical switch are electrically connected to the controller;

[0043] The photovoltaic power prediction module calculates the predicted photovoltaic power based on the real-time obtained meteorological data and sends it to the controller; the controller controls the actions of the electric control switch and the electrical switch according to the predicted photovoltaic power.

[0044] Embodiment 2

[0045] As Figure 2 shown, this embodiment provides an optical storage hybrid topology, including: a photovoltaic power prediction module, a photovoltaic unit, and an energy storage unit;

[0046] The energy storage unit includes an energy storage converter and an energy storage battery pack. The energy storage battery pack is electrically connected to the distribution network through the energy storage converter. The photovoltaic unit includes a photovoltaic panel and a photovoltaic inverter. The photovoltaic panel is electrically connected to the distribution network through the photovoltaic inverter, and an electric control switch is provided on the circuit between the photovoltaic panel and the photovoltaic inverter. ;

[0047] The photovoltaic unit and the energy storage unit are electrically connected, and an electrical switch is provided between the photovoltaic unit and the energy storage unit. And a bidirectional DC / DC module. The input end of the bidirectional DC / DC module is electrically connected to the circuit between the energy storage converter and the energy storage battery pack, and the voltage will vary due to factors such as the charge and discharge state of the battery, the degree of battery aging, and temperature. The output end of the bidirectional DC / DC module is electrically connected to the electrical switch. The electrical switch is electrically connected to the circuit between the photovoltaic inverter and the electric control switch and is responsible for providing a stable voltage to the DC side of the photovoltaic inverter.

[0048] When the photovoltaic power generation is insufficient or the load demand is greater than the photovoltaic output, the energy storage battery pack discharges through the bidirectional DC / DC module and transfers the energy to the DC side of the photovoltaic inverter. At this time, the power flows from the energy storage unit to the photovoltaic inverter. When the photovoltaic array generates excess power or the load demand is low, the excess energy on the DC side of the photovoltaic inverter charges the energy storage device through the bidirectional DC / DC module, and the power flow direction is opposite. Advanced control algorithms (such as PID control, sliding mode control, etc.) are used to monitor the battery voltage and inverter demand in real time and precisely adjust the output voltage.

[0049] The bidirectional DC / DC module cooperates with the energy management system (EMS) to adjust the power flow direction and voltage according to the system operating state and prediction information. When the photovoltaic power is insufficient, the energy storage discharge power is increased; when the photovoltaic power generation is excessive, the energy storage charging power is increased to improve the energy utilization efficiency. When there are power grid fluctuations or load mutations, the bidirectional DC / DC module quickly adjusts the output voltage and power to maintain the system stability and reduce the impact of fluctuations on the power grid.

[0050] The control ports of the photovoltaic power prediction module and the electric control switch , and the control port of the electrical switch are electrically connected to the controller.

[0051] The photovoltaic power prediction module calculates the predicted photovoltaic power based on the real-time obtained meteorological data and sends it to the controller. The controller controls the actions of the electric control switch and the electrical switch according to the predicted photovoltaic power.

[0052] The controller obtains the energy storage state of the energy storage battery pack and controls the electric control switch according to the predicted photovoltaic power and the energy storage state. and the electrical switch to act.

[0053] Embodiment 3

[0054] As Figure 3 shown, this embodiment provides a hybrid photovoltaic and energy storage topology structure, including: a photovoltaic power prediction module, a photovoltaic unit, and an energy storage unit;

[0055] The energy storage unit includes an energy storage converter and an energy storage battery pack. The energy storage battery pack is electrically connected to the distribution network through the energy storage converter; several photovoltaic units are electrically connected to the distribution network. The photovoltaic unit includes a photovoltaic and a photovoltaic inverter. The photovoltaic is electrically connected to the distribution network through the photovoltaic inverter. An electric control switch is provided on the circuit between the photovoltaic and the photovoltaic inverter. ;

[0056] The photovoltaic unit and the energy storage unit are electrically connected. An electrical switch and a bidirectional DC / DC module are provided between the photovoltaic unit and the energy storage unit. The input end of the bidirectional DC / DC module is electrically connected to the circuit between the energy storage converter and the energy storage battery pack; the output end of the bidirectional DC / DC module is electrically connected to the electrical switch. ; ;

[0057] The first photovoltaic unit is electrically connected to the energy storage unit through an electrical switch. Adjacent two photovoltaic units are electrically connected through an electrical switch. ; where j is the serial number of the photovoltaic unit and N is the number of photovoltaic units; the control port is electrically connected to the controller. ; , j is the photovoltaic unit serial number, N is the number of photovoltaic units; the control port is electrically connected to the controller.

[0058] One end of the electrical switch is connected to the circuit between the photovoltaic and the photovoltaic inverter within the th photovoltaic unit. The other end of the electrical switch is connected to the circuit between the photovoltaic and the photovoltaic inverter within the th photovoltaic unit.

[0059] The control ports of the photovoltaic power prediction module, the electric control switch , and the electrical switch are electrically connected to the controller;

[0060] The photovoltaic power prediction module calculates the predicted photovoltaic power based on the meteorological data obtained in real time and sends it to the controller; the controller controls the electric control switch and the electrical switch Action

[0061] Embodiment 4

[0062] As Figure 4 shown, this embodiment provides a hybrid photovoltaic and energy storage topology structure, including: a photovoltaic power prediction module, a photovoltaic unit, and an energy storage unit;

[0063] A number of energy storage units are electrically connected to the distribution network. The energy storage unit includes an energy storage converter and an energy storage battery pack. The energy storage battery pack is electrically connected to the distribution network through the energy storage converter; the photovoltaic unit includes a photovoltaic and a photovoltaic inverter. The photovoltaic is electrically connected to the distribution network through the photovoltaic inverter, and an electric control switch is provided on the circuit between the photovoltaic and the photovoltaic inverter ;

[0064] The photovoltaic unit and the energy storage unit are electrically connected, and an electrical switch is provided between the photovoltaic unit and the energy storage unit and a bidirectional DC / DC module. The energy storage unit and the bidirectional DC / DC module are provided in one-to-one correspondence; the input end of the bidirectional DC / DC module is electrically connected to the circuit between the energy storage converter and the energy storage battery pack; the output end of the bidirectional DC / DC module is electrically connected to the electrical switch ; The electrical switch is electrically connected to the circuit between the photovoltaic inverter and the electric control switch ;

[0065] The photovoltaic power prediction module, the control port of the electric control switch , and the control port of the electrical switch are electrically connected to the controller;

[0066] The photovoltaic power prediction module calculates the predicted photovoltaic power based on the real-time acquired meteorological data and sends it to the controller; the controller controls the electric control switch and the electrical switch to act.

[0067] Embodiment 5

[0068] As Figure 5 shown, this embodiment also provides a control method for the hybrid photovoltaic and energy storage topology structure. The control method can be applied to the hybrid photovoltaic and energy storage topology structure described in any one of Embodiments 1 to 4. The control method includes:

[0069] Acquire meteorological data and input it into the photovoltaic prediction module to obtain the predicted photovoltaic power, and send the predicted photovoltaic power to the controller;

[0070] Control the electric control switch and the electrical switch Actions, specifically including:

[0071] When the predicted photovoltaic power is greater than the first power threshold control the electric control switch to actuate and conduct the circuit between the photovoltaic and the photovoltaic inverter, and control the electrical switch to actuate and disconnect the circuit between the photovoltaic unit and the energy storage unit;

[0072] For example, when the lighting condition is good, the electrical switch is disconnected, and the electric control switch is closed. At this time, the bidirectional DCDC module is in the standby (or shutdown) state, reducing power consumption. In this mode, the photovoltaic inverter can accept the control commands of the power station AGC and AVC in the distribution network. Through the photovoltaic power prediction module to predict the photovoltaic power generation, combined with the state of the energy storage battery to ensure the overall power supply capacity of the photovoltaic + energy storage. This mode is compatible with the AC coupling mode in the traditional photovoltaic energy storage power station.

[0073] When the value of the predicted photovoltaic power is between the first power threshold and the second power threshold control the electric control switch to actuate and conduct the circuit between the photovoltaic and the photovoltaic inverter, and control the electrical switch to actuate and conduct the circuit between the photovoltaic unit and the energy storage unit.

[0074] For example, when there is a fault in the photovoltaic, or when the photovoltaic power generation predicted by the photovoltaic power prediction module is not sufficient, at this time the photovoltaic inverter cannot output full power. To ensure the power consumption of the load, control the electric control switch to conduct and the electrical switch to conduct. The photovoltaic inverter can draw energy from both the photovoltaic and the energy storage battery pack at the same time to invert and supply power to the load; make the energy storage and the photovoltaic have a certain redundant design to ensure the power supply capacity and improve the power supply reliability.

[0075] In addition, since the maximum power generation of the photovoltaic cell will gradually decay with the operation time, that is, its load-carrying capacity will decrease. To make up for this problem, the output power of the energy storage unit is used to supplement the decay power of the photovoltaic unit. The expression formula is:

[0076]

[0077] In the formula, is the load power; is the total output power of each photovoltaic unit; is the power of the bidirectional DC / DC module; is the maximum instantaneous power of the energy storage unit.

[0078] The bidirectional DC / DC module can accept the control strategy of the EMS, utilize the energy storage unit to supplement the attenuated power of the photovoltaic cells, and ensure the power supply capacity of the photovoltaic energy storage system throughout its life cycle.

[0079] When the predicted photovoltaic power is less than the first power threshold control the electric control switch to actuate and disconnect the circuit between the photovoltaic and the photovoltaic inverter, and control the electrical switch to actuate and conduct the circuit between the photovoltaic unit and the energy storage unit, and utilize the output power of the energy storage unit to replace the output power of the photovoltaic unit.

[0080] When the distribution power grid requires grid-forming ability under conditions of large load, evening or cloudy days and other situations with insufficient photovoltaic power, the control system will disconnect the electric control switch in advance and keep the electrical switch closed. At this time, the photovoltaic inverter uses the stable DC voltage (such as 1500V) output by the DC / DC module to establish normal operation, and works in coordination with the energy storage converter that is also in the grid-forming mode to jointly provide power support for the power grid or microgrid. Both rely on the battery pack to establish the DC voltage, and the battery pack has short-term overload capacity, and on the premise of ensuring safety, it guarantees the safe and stable operation of the power grid.

[0081] Embodiment 6

[0082] This embodiment also provides a control method for a photovoltaic energy storage hybrid topology structure, which is different from the control method described in Embodiment 5 in that:

[0083] A bidirectional DC / DC module is provided between the energy storage battery pack and the electrical switch The input end of the bidirectional DC / DC module is electrically connected to the circuit between the energy storage converter and the energy storage battery pack; the output end of the bidirectional DC / DC module is electrically connected to the electrical switch ;

[0084] Obtain the energy storage state of the energy storage battery pack, and control the electric control switch and the electrical switch to actuate according to the predicted photovoltaic power and the energy storage state, specifically including:

[0085] When the predicted photovoltaic power is greater than the first power threshold , and the energy storage state of the energy storage battery pack is less than the energy storage threshold, control the electric control switch to actuate and conduct the circuit between the photovoltaic and the photovoltaic inverter, and control the electrical switch to actuate and conduct the circuit between the photovoltaic unit and the energy storage unit; supply power to the distribution network through the output power of the photovoltaic unit and charge the energy storage unit.

[0086] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0087] The present application is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, and the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0088] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including instruction means that implement the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0089] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0090] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A hybrid photovoltaic and energy storage topology, characterized in that, Including: A photovoltaic power prediction module, a photovoltaic unit and an energy storage unit; The energy storage unit includes an energy storage converter and an energy storage battery pack. The energy storage battery pack is electrically connected to the power distribution network through the energy storage converter. The photovoltaic unit includes a photovoltaic panel and a photovoltaic inverter. The photovoltaic panel is electrically connected to the power distribution network through the photovoltaic inverter, and an electric control switch is arranged on the circuit between the photovoltaic panel and the photovoltaic inverter. ; Electrical switch One end is electrically connected to the circuit between the energy storage converter and the energy storage battery pack; the electrical switch The other end is electrically connected to the circuit between the photovoltaic inverter and the electric control switch ; The photovoltaic power prediction module and the electric control switch The control port of which, and the electric switch The control port of which is electrically connected to the controller; The photovoltaic power prediction module calculates the predicted photovoltaic power based on the real-time obtained meteorological data and sends it to the controller; the controller controls the electric control switch according to the predicted photovoltaic power and the electrical switch to act.

2. The hybrid optical storage topology according to claim 1, characterized in that A number of photovoltaic units are electrically connected to the distribution network, and the first photovoltaic unit is electrically connected to the energy storage unit through an electrical switch Electrically connected, and adjacent two photovoltaic units are electrically connected through an electrical switch Electrically connected, , where j is the serial number of the photovoltaic unit and N is the number of photovoltaic units; the control port of the electrical switch is electrically connected to the controller.

3. The hybrid photovoltaic and energy storage topology according to claim 2, wherein The electrical switch One end is connected to the circuit between the photovoltaic and the photovoltaic inverter in the th photovoltaic unit, and the other end of the electrical switch is connected to the circuit between the photovoltaic and the photovoltaic inverter in the 4. The hybrid photovoltaic and energy storage topology according to claim 1, characterized in that Energy storage battery pack and electrical switch A bi-directional DC / DC module is provided between them. The input end of the bi-directional DC / DC module is electrically connected to the circuit between the energy storage inverter and the energy storage battery pack; the output end of the bi-directional DC / DC module is electrically connected to the electrical switch .

5. The hybrid optical storage topology according to claim 1, characterized in that, The energy storage battery pack is electrically connected to the controller, and the controller obtains the energy storage state of the energy storage battery pack and controls the electric control switch according to the predicted photovoltaic power and the energy storage state. and the electrical switch to act.

6. The hybrid photovoltaic and energy storage topology according to claim 1, characterized in that, A plurality of energy storage units are electrically connected to the distribution network, and the energy storage units are arranged in one-to-one correspondence with the bidirectional DC / DC modules.

7. A control method for a hybrid photovoltaic and energy storage topology, characterized in that, Including: Obtain meteorological data and input it into the photovoltaic prediction module to obtain the predicted photovoltaic power, and send the predicted photovoltaic power to the controller. Control the electric control switch according to the predicted power of the photovoltaic and the electrical switch act.

8. The control method according to claim 7, wherein Control the electric control switch according to the predicted power of the photovoltaic and the electrical switch act, specifically including: When the predicted photovoltaic power is greater than the first power threshold control the electric control switch to actuate and conduct the circuit between the photovoltaic and the photovoltaic inverter, and control the electric switch to actuate and disconnect the circuit between the photovoltaic unit and the energy storage unit; When the value of the predicted PV power is between the first power threshold and the second power threshold , control the electric control switch to actuate and conduct the circuit between the PV and the PV inverter, and control the electric switch to actuate and conduct the circuit between the PV unit and the energy storage unit; use the output power of the energy storage unit to supplement the attenuated power of the PV unit; When the predicted power of the photovoltaic is less than the first power threshold control the electric control switch to actuate and disconnect the circuit between the photovoltaic and the photovoltaic inverter, and control the electric switch to actuate and conduct the circuit between the photovoltaic unit and the energy storage unit, and use the output power of the energy storage unit to replace the output power of the photovoltaic unit.

9. The control method according to claim 7, wherein Energy storage battery pack and electrical switch A bidirectional DC / DC module is provided between them. The input end of the bidirectional DC / DC module is electrically connected to the circuit between the energy storage converter and the energy storage battery pack; the output end of the bidirectional DC / DC module is electrically connected to the electrical switch ; Obtain the energy storage state of the energy storage battery pack, and control the electronic control switch according to the predicted photovoltaic power and the energy storage state and the electrical switch to act, specifically including: When the predicted power of the photovoltaic is greater than the first power threshold , when the energy storage state of the energy storage battery pack is less than the energy storage threshold, control the electric control switch to actuate and conduct the circuit between the photovoltaic and the photovoltaic inverter, and control the electrical switch to actuate and conduct the circuit between the photovoltaic unit and the energy storage unit; supply power to the distribution network through the output power of the photovoltaic unit and charge the energy storage unit.

10. The control method according to claim 8, wherein Use the output power of the energy storage unit to supplement the attenuation power of the photovoltaic unit, specifically including: ； In the formula, is the load power; is the total output power of each photovoltaic unit; is the power of the bidirectional DC / DC module; is the maximum instantaneous power of the energy storage unit.

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