AC low-voltage side coupled optical storage power generation system and installation equipment

Abstract

The invention belongs to the technical field of power supply driving, and particularly relates to an alternating current low voltage side coupled optical storage power generation system and installation equipment, the system comprises at least one energy storage converter module and at least one photovoltaic inverter module, the hardware structures of the energy storage converter module and the photovoltaic inverter module are the same, and when the system works, the energy storage converter module is connected with the photovoltaic inverter module. The first end of the energy storage converter module is connected with an energy storage battery, the first end of the photovoltaic inverter module is connected with a photovoltaic assembly, and the second end of the energy storage inverter module and the second end of the photovoltaic inverter module are connected and jointly connected to one end of a load, so that the energy storage converter module and the photovoltaic inverter module are connected in parallel. The same hardware structure is adopted, maintenance is facilitated, compatibility between modules is enhanced, the voltage systems and switching frequencies of the energy storage converter module and the photovoltaic inverter module can be the same, conversion between the energy storage converter module and the photovoltaic inverter module by a transformer is not needed, the energy conversion efficiency is improved, and then the working efficiency of the system is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power generation equipment, in particular to an alternating current low-voltage side coupled light storage power generation system and installation equipment. BACKGROUND

[0002] The mainstream technical solution of the current large-scale light storage system is alternating current high-voltage side coupling, and the core architecture is that the photovoltaic inverter and the energy storage converter are respectively connected to the medium-voltage power grid through independent step-up transformers. This scheme needs to additionally add a grid connection point to meet the operation requirements. However, in actual application, this scheme and related technical system expose many outstanding problems, which seriously restrict the system efficiency and popularization and application.

[0003] Firstly, the energy conversion efficiency is low. In some power-limited areas, the electrical energy generated by the photovoltaic module needs to be processed through two-stage transformers of step-up and step-down before being stored in the energy storage system. The double transformation process causes a large amount of energy loss, and there is a problem of low system RTE (Round-Trip Efficiency) efficiency. Secondly, the system compatibility is poor. Since the photovoltaic inverter and the energy storage converter are independent hardware devices in the existing system, the spare parts of the two are not universal, and there are differences in voltage system, hardware topology and switching frequency between the photovoltaic inverter and the energy storage converter. When the system is running, there is a high-frequency circulating current, which causes the system to fail to run normally and cannot realize alternating current low-voltage coupling. SUMMARY

[0004] The present application provides an alternating current low-voltage side coupled light storage power generation system, which aims to solve the technical problems of low system working efficiency and poor compatibility in the prior art based on alternating current high-voltage side coupling of photovoltaic inverters and energy storage converters for light storage power generation.

[0005] The present application is implemented in the following manner. In a first aspect, an alternating current low-voltage side coupled light storage power generation system is provided, which comprises at least one energy storage converter module and at least one photovoltaic inverter module. The hardware structure of the energy storage converter module is the same as that of the photovoltaic inverter module. When the system is working, the first end of the energy storage converter module is connected to an energy storage battery, the first end of the photovoltaic inverter module is connected to a photovoltaic module, and the second end of the energy storage inverter module and the second end of the photovoltaic inverter module are connected and jointly connected to one end of a load, so that the energy storage converter module and the photovoltaic inverter module are connected in parallel.

[0006] Furthermore, each energy storage converter module comprises an energy storage converter, a first circuit breaker on the converter side and a second circuit breaker on the converter side. The first circuit breaker on the converter side is connected to the energy storage converter and the load, and the second circuit breaker on the converter side is connected to the energy storage converter and the energy storage battery.

[0007] Furthermore, each of the photovoltaic inverter modules includes a photovoltaic inverter, an inverter-side first circuit breaker, and an inverter-side second circuit breaker. The inverter-side first circuit breaker connects the photovoltaic inverter to the load, and the inverter-side second circuit breaker connects the photovoltaic inverter to the photovoltaic module. The common connection terminal of the inverter-side first circuit breaker and the inverter-side first circuit breaker is connected to the load.

[0008] Furthermore, the energy storage converter and the photovoltaic inverter include a scheduling CAN interface, and each scheduling CAN interface is connected to a scheduling CAN bus to communicate with the control terminal device through the scheduling CAN bus.

[0009] Furthermore, the energy storage converter and the photovoltaic inverter also include a parallel CAN interface, which is connected to the parallel CAN bus to enable inter-module communication between the energy storage converter and the photovoltaic inverter.

[0010] Furthermore, the energy storage converter and the photovoltaic inverter are also connected to a high-frequency synchronous bus, and the switching transistors in the energy storage converter and the photovoltaic inverter are synchronously driven based on the high-frequency synchronous bus.

[0011] Furthermore, the energy storage converter and the photovoltaic inverter are also connected to the power frequency synchronization bus, and the phase synchronization adjustment of the energy storage converter and the photovoltaic inverter is performed based on the power frequency synchronization bus.

[0012] Furthermore, the energy storage converter module operates in grid-connected mode.

[0013] Furthermore, when the system includes multiple energy storage converter modules and photovoltaic inverter modules, the multiple energy storage converter modules and photovoltaic inverter modules are simultaneously installed in the same installation device.

[0014] In a second aspect, an installation device is also provided for installing the AC low-voltage side-coupled photovoltaic-storage power generation system described in any one of the first aspects.

[0015] The beneficial effects achieved by this invention are as follows: By adopting a modular design and setting the hardware structure of the energy storage converter module and the photovoltaic inverter module to be identical, when the system is working, the first end of the energy storage converter module is connected to the energy storage battery, the first end of the photovoltaic inverter module is connected to the photovoltaic module, and the second end of the energy storage inverter module is connected to the second end of the photovoltaic inverter module and together connected to one end of the load, so that the energy storage converter module and the photovoltaic inverter module form a parallel connection. The identical hardware structure not only facilitates maintenance and enhances the compatibility of the modules, but also enables the energy storage converter module and the photovoltaic inverter module to have the same voltage system and switching frequency, eliminating the need for a transformer to convert between the two, improving energy conversion efficiency, and thus improving the system's operating efficiency. Attached Figure Description

[0016] Figure 1 A schematic diagram of an AC low-voltage side-coupled photovoltaic-storage power generation system provided in an embodiment of the present invention; Figure 2 A circuit diagram of an optional AC low-voltage side-coupled photovoltaic-storage power generation system provided for this embodiment; Figure 3 This embodiment provides a main topology diagram of an optional AC low-voltage side-coupled photovoltaic-storage power generation system. Figure 4 A schematic diagram of the charging and discharging of an optional AC low-voltage side-coupled photovoltaic energy storage power generation system provided in this embodiment; Figure 5 A communication topology diagram of an optional AC low-voltage side-coupled photovoltaic-storage power generation system provided in this embodiment; Figure 6 This embodiment provides an optional parallel connection circuit diagram of a photovoltaic inverter and an energy storage converter. Figure 7 This embodiment provides an optional high-frequency synchronization waveform diagram; Figure 8 This is a schematic diagram of an optional installation device structure provided in this embodiment.

[0017] Among them, 1. Energy storage converter module, 2. Photovoltaic inverter module. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0019] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "left", "right", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0024] This application employs a modular design, with the energy storage converter module and the photovoltaic inverter module sharing the same hardware structure. When the system is operating, the first end of the energy storage converter module is connected to the energy storage battery, and the first end of the photovoltaic inverter module is connected to the photovoltaic module. The second end of the energy storage inverter module is connected to the second end of the photovoltaic inverter module, and both are connected to one end of the load. This allows the energy storage converter module and the photovoltaic inverter module to form a parallel connection. Using the same hardware structure not only facilitates maintenance and enhances module compatibility, but also ensures that the voltage system and switching frequency of the energy storage converter module and the photovoltaic inverter module are identical, eliminating the need for a transformer between them, thus improving energy conversion efficiency and ultimately enhancing system efficiency.

[0025] Example One Combination Figure 1 As shown, this embodiment of the invention provides an AC low-voltage side coupled photovoltaic-storage power generation system, including: at least one energy storage converter module 1 and at least one photovoltaic inverter module 2. The energy storage converter module 1 and the photovoltaic inverter module 2 have the same hardware structure. When the system is working, the first end of the energy storage converter module 1 is connected to the energy storage battery, the first end of the photovoltaic inverter module 2 is connected to the photovoltaic module, and the second end of the energy storage inverter module is connected to the second end of the photovoltaic inverter module 2 and is connected to one end of the load, so that the energy storage converter module 1 and the photovoltaic inverter module 2 form a parallel connection.

[0026] In this AC low-voltage coupled photovoltaic-storage power generation system, the energy storage converter module 1 is responsible for controlling the charging and discharging process of the energy storage battery (BAT), realizing the conversion between DC and AC power. The photovoltaic inverter module 2 is used to convert the DC power generated by the photovoltaic module into AC power for supply to the grid or load. During system operation, the first end of the energy storage converter module 1 is connected to the energy storage battery, and the first end of the photovoltaic inverter module 2 is connected to the photovoltaic module (PV). The second end of the energy storage inverter module 1 is connected to the second end of the photovoltaic inverter module 2 and both are connected to one end of the load, allowing the energy storage converter module 1 and the photovoltaic inverter module 2 to form a parallel connection during system operation. Furthermore, in this embodiment, the energy storage converter module 1 and the photovoltaic inverter module 2 are set up as modules with identical hardware structures. This not only facilitates later operation and maintenance but also ensures that the voltage system and switching frequency of the energy storage converter module 1 and the photovoltaic inverter module 2 are the same, eliminating the need for transformer isolation and reducing system equipment costs.

[0027] In some examples, combined Figure 2 As shown, Figure 2 This embodiment provides a circuit diagram of an optional AC low-voltage side coupled photovoltaic-storage power generation system. It includes four energy storage converter modules 1 and four photovoltaic inverter modules 2. When the system is operating, the switches in each module are closed. One end of each of the four energy storage converter modules 1 is connected to an energy storage battery (BAT#1~BAT#4), and one end of each of the four photovoltaic inverter modules 2 is connected to a photovoltaic module (PV#1~PV#4). The other ends of both modules are connected to the AC side, which can be a load or the power grid. Since the energy storage converter modules 1 and photovoltaic inverter modules 2 use the same hardware structure, there is no need for an AC / AC conversion via a transformer. Figure 2 The energy storage converter module 1 and photovoltaic inverter module 2 can be flexibly configured according to on-site requirements, and the above is not the only limitation.

[0028] like Figure 3 The diagram shown is a main topology of an optional AC low-voltage side-coupled photovoltaic-storage power generation system provided in this embodiment. Based on Figure 3 It can be seen that the energy storage converter module 1 and the photovoltaic inverter module 2 adopt a single-stage architecture, and the DC side input can be compatible with BAT and PV respectively. Among them, the photovoltaic inverter module 2 can realize the maximum power point optimization function in the DC / AC link through software algorithm, without the need for independent DC / DC conversion to achieve this function. Therefore, the energy storage converter module 1 and the photovoltaic inverter module 2 can have completely identical internal hardware.

[0029] like Figure 4 As shown, Figure 4This embodiment provides a schematic diagram of the charging and discharging of an optional AC low-voltage side-coupled photovoltaic-storage power generation system. During charging, the photovoltaic modules charge the photovoltaic inverter module 2. The photovoltaic inverter module 2 and the energy storage converter module 1 have the same hardware structure, eliminating the need for a transformer. Current flows directly from the photovoltaic inverter module 2 into the energy storage converter module 1, and after conversion by the energy storage converter module 1, it charges the energy storage battery. During discharging, the energy storage battery discharges, and the current flows through the energy storage converter module 1 for conversion before being directly output to the local load. Actual measurements show that the RTE (Round-Trip Efficiency) of the AC low-voltage side-coupled photovoltaic-storage power generation system without transformer coupling is: Kinv*Kpcs*Kpcs*Kbat = 98.5%*98.5%*98.5%*96% = 91.8%, representing a 2% increase in efficiency compared to systems with transformer coupling.

[0030] In this embodiment of the invention, by adopting a modular design and setting the hardware structure of the energy storage inverter module 1 and the photovoltaic inverter module 2 to be identical, when the system is working, the first end of the energy storage inverter module 1 is connected to the energy storage battery, the first end of the photovoltaic inverter module 2 is connected to the photovoltaic module, and the second end of the energy storage inverter module is connected to the second end of the photovoltaic inverter module 2 and is connected to one end of the load, so that the energy storage inverter module 1 and the photovoltaic inverter module 2 form a parallel connection. The identical hardware structure not only facilitates maintenance and enhances the compatibility of the modules, but also enables the energy storage inverter module 1 and the photovoltaic inverter module 2 to have the same voltage system and switching frequency, eliminating the need for a transformer to convert between the two, improving energy conversion efficiency, and thus improving the system's working efficiency.

[0031] Example Two Combination Figure 2 As shown, in some optional embodiments, each of the above-mentioned energy storage converter modules 1 includes an energy storage converter, a first circuit breaker on the converter side, and a second circuit breaker on the converter side. The first circuit breaker on the converter side connects the energy storage converter to the load, and the second circuit breaker on the converter side connects the energy storage converter to the energy storage battery.

[0032] PCS (Power Conversion System) represents an energy storage converter used to convert direct current (DC) to alternating current (AC). In photovoltaic systems, PCS is usually referred to as an inverter, and depending on the application scenario and power level, it can be divided into centralized inverters, string inverters, and microinverters, etc. Figure 2 In this context, PCS includes PCS#1 to PCS#4. QF (Circuit Breaker) represents the first circuit breaker on the converter side, which is a protective device in the circuit, such as... Figure 2QF11~QF14 are connected between the PCS and the AC side, respectively. When an overload or short circuit occurs in the circuit, the corresponding branches of QF11~QF14 will automatically cut off the current to prevent equipment damage or safety accidents. DCCB (Direct Current Circuit Breaker) represents the second circuit breaker on the converter side. This second circuit breaker is a DC circuit breaker connected between BAT and PCS, used for overload and short circuit protection in DC circuits. It has the ability to quickly cut off the current to prevent damage to DC side equipment, such as... Figure 2 DDCB1~DDCB4 in the series.

[0033] In this embodiment, the PCS can control the charging and discharging process of BAT, realizing the conversion between DC and AC power. Connecting QF between the PCS and the AC side can quickly and automatically cut off the current when the circuit is overloaded or short-circuited, preventing the release of high current from the DC side to the AC side / AC side to the DC side, which could cause equipment damage. Connecting DCCB at the other end of the PCS can prevent damage to the DC side equipment, especially protecting the PCS.

[0034] Example Three Combination Figure 2 As shown, in some optional embodiments, each of the photovoltaic inverter modules 2 includes a photovoltaic inverter, an inverter-side first circuit breaker, and an inverter-side second circuit breaker. The inverter-side first circuit breaker connects the photovoltaic inverter to the load, the inverter-side second circuit breaker connects the photovoltaic inverter to the photovoltaic module, and the common connection terminal of the inverter-side first circuit breaker and the inverter-side first circuit breaker is connected to the load.

[0035] In this embodiment, INV (Inverter) represents a photovoltaic inverter. INV is located on the DC side and is used to convert the DC power generated by the PV into AC power so as to supply the AC power grid or load. Figure 2 In the inverter side, the first circuit breaker includes QF15~QF18, which are connected between INV#1~INV#4 and the AC side. When an overload or short circuit occurs in the circuit, the corresponding branch of QF15~QF18 will automatically cut off the current to prevent damage to INV and other equipment. Figure 2 In the inverter side, the second circuit breaker includes DDCB5~DDCB8, which is connected between PV and INV. It is used for overload and short circuit protection of DC circuit and has the ability to quickly cut off current to prevent damage to DC side equipment.

[0036] In some optional embodiments, the number of PCS and INV can be configured according to the actual needs of the customer's site. For example, the total number of PCS and INV is N, which can be 1 photovoltaic inverter + (N-1) energy storage converters, or (N-1) photovoltaic inverters + 1 energy storage converter.

[0037] In this embodiment, the INV can convert the DC power generated by the PV into AC power. The QF is connected between the INV and the AC side, which can quickly and automatically cut off the current when the circuit is overloaded or short-circuited, preventing the DC side from releasing high current to the AC side / AC side from the DC side, which would cause equipment damage. The DCCB is connected to the other end of the INV, which can prevent damage to the DC side equipment, especially to protect the inverter.

[0038] Example Four Combination Figure 5 As shown, Figure 5 This embodiment provides an optional communication topology diagram for an AC low-voltage side-coupled photovoltaic-storage power generation system. In some optional embodiments, the energy storage converter and the photovoltaic inverter include a scheduling CAN interface, each of which is connected to a scheduling CAN bus and communicates with the control terminal device through the scheduling CAN bus.

[0039] Specifically, each PCS and INV can be equipped with a scheduling CAN interface. The scheduling CAN is the communication interface between the PCS / INV and the control terminal device. After being connected by twisted-pair shielded cables, it is connected to the control terminal device based on the scheduling CAN bus. The control terminal device includes a host computer or a local controller.

[0040] In this embodiment, fast power scheduling between the host computer and the PCS and INV can be achieved by scheduling the CAN interface connection. The scheduling command is directly sent to the DSP of the PCS and INV, reducing the communication latency of monitoring and forwarding, and achieving millisecond-level power response.

[0041] Example Five Combination Figure 5 As shown, in some optional embodiments, the energy storage converter and the photovoltaic inverter also include a parallel CAN interface, which is connected to the parallel CAN bus to enable inter-module communication between the energy storage converter and the photovoltaic inverter.

[0042] The PCS and INV modules also include a parallel CAN interface. This interface is used for signal transmission such as current sharing or power sharing between the PCS and INV modules. They are connected daisy-chained via twisted-pair shielded cables and are not connected to a host computer. The parallel CAN interface enables rapid power distribution in off-grid conditions.

[0043] Example Six Combination Figure 5 and Figure 6 As shown, in some optional embodiments, the energy storage converter and the photovoltaic inverter are also connected to a high-frequency synchronous bus, and the switching transistors in the energy storage converter and the photovoltaic inverter are synchronously driven based on the high-frequency synchronous bus.

[0044] The switching transistors include, but are not limited to, IGBTs and MOSFETs. The PCS and INV are jointly connected to a high-frequency synchronization bus. High-frequency synchronization is used to drive synchronization signals between the switching transistors of the PCS and INV. These modules are connected daisy-chained via twisted-pair shielded cables and are not connected to a host computer. High-frequency synchronization enables carrier synchronization between multiple modules, avoiding high-frequency circulating currents.

[0045] like Figure 6 As shown, Figure 6 This embodiment provides an optional parallel connection circuit diagram of a photovoltaic inverter and an energy storage converter. To achieve Va=Vb, the switching frequencies of the PCS and INV must be consistent with the high-frequency carrier wave. In this embodiment, since the PCS and INV are located in the same rack, and because the PCS and INV have the same voltage system and switching frequency, high-frequency synchronization can be achieved in hardware, such as... Figure 7 As shown, the circulating current between filters is suppressed, thereby achieving Va=Vb.

[0046] Example Seven Combination Figure 5 As shown, in some optional embodiments, the energy storage converter and the photovoltaic inverter are also connected to the power frequency synchronization bus, and the phase synchronization adjustment of the energy storage converter and the photovoltaic inverter is performed based on the power frequency synchronization bus.

[0047] The PCS and INV are both connected to the power frequency synchronization bus, which transmits power frequency synchronization signals. These signals are AC voltage phase synchronization signals between the PCS and INV to achieve phase synchronization adjustment. The power frequency synchronization is achieved by connecting the modules daisy-chaining them with twisted-pair shielded cables, without connecting to a host computer.

[0048] In some optional embodiments, the energy storage converter module 1 operates in grid-connected mode.

[0049] The PCS operates in grid-connected mode (VSG mode), employing active frequency regulation and reactive voltage regulation. It exhibits independent voltage source characteristics and can maintain the port voltage without stopping or switching modes after a grid power outage, ensuring the continuity of power supply to the load. It can effectively support the grid and also solve the stability problem of traditional photovoltaic inverters under low SCR (short-circuit ratio).

[0050] In some optional embodiments, the external interfaces of both PCS and INV use quick-connect terminals, which are plug-and-play, reduce on-site construction and commissioning workload, and can be deployed quickly.

[0051] In some optional embodiments, when the system includes multiple energy storage converter modules 1 and photovoltaic inverter modules 2, the multiple energy storage converter modules 1 and photovoltaic inverter modules 2 are simultaneously installed in the same mounting device. That is, in a photovoltaic-energy storage power generation system coupled on the AC low-voltage side, when multiple energy storage converter modules 1 and photovoltaic inverter modules 2 are connected in parallel and simultaneously installed in the same mounting device, multiple modules can work together to enhance energy conversion efficiency.

[0052] Example Eight Combination Figure 8 As shown, Figure 8 This is a schematic diagram of an optional installation device structure provided in this embodiment. In this embodiment, an installation device is used to install the AC low-voltage side-coupled photovoltaic-storage power generation system described in any of the above embodiments.

[0053] In this embodiment, multiple mounting components can be installed on the mounting equipment. These components are used to install the energy storage converter module and the photovoltaic inverter module in the AC low-voltage side-coupled photovoltaic-energy storage power generation system. Since the energy storage converter module and the photovoltaic inverter module have the same hardware structure, the mounting components on the mounting equipment can be uniformly configured. Furthermore, the AC low-voltage side-coupled photovoltaic-energy storage power generation system installed on the mounting equipment in this embodiment can implement the specific embodiments described above and achieve the corresponding technical effects, which will not be elaborated further here.

[0054] It should be understood that the terms "first," "second," etc., in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order. The reference to "embodiment" herein means that a specific feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of the invention. "Multiple" refers to two or more. And / or is merely a variable relationship describing related objects, indicating that three relationships may exist. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0055] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An AC low-voltage side-coupled photovoltaic-storage power generation system, comprising: At least one energy storage converter module and at least one photovoltaic inverter module, characterized in that the energy storage converter module and the photovoltaic inverter module have the same hardware structure, and when the system is working, the first end of the energy storage converter module is connected to an energy storage battery, the first end of the photovoltaic inverter module is connected to a photovoltaic module, and the second end of the energy storage inverter module is connected to the second end of the photovoltaic inverter module and together connected to one end of the load, so that the energy storage converter module and the photovoltaic inverter module form a parallel connection.

2. The AC low-voltage side coupled photovoltaic-storage power generation system according to claim 1, characterized in that, Each of the energy storage converter modules includes an energy storage converter, a first circuit breaker on the converter side, and a second circuit breaker on the converter side. The first circuit breaker on the converter side connects the energy storage converter to the load, and the second circuit breaker on the converter side connects the energy storage converter to the energy storage battery.

3. The AC low-voltage side coupled photovoltaic-storage power generation system according to claim 2, characterized in that, Each photovoltaic inverter module includes a photovoltaic inverter, an inverter-side first circuit breaker, and an inverter-side second circuit breaker. The inverter-side first circuit breaker connects the photovoltaic inverter to the load, and the inverter-side second circuit breaker connects the photovoltaic inverter to the photovoltaic module. The common connection terminal of the inverter-side first circuit breaker and the inverter-side first circuit breaker is connected to the load.

4. The AC low-voltage side coupled photovoltaic-storage power generation system according to claim 3, characterized in that, The energy storage converter and the photovoltaic inverter both include a scheduling CAN interface, and each scheduling CAN interface is connected to a scheduling CAN bus, through which it communicates with the control terminal device.

5. The AC low-voltage side coupled photovoltaic-storage power generation system according to claim 3, characterized in that, The energy storage converter and the photovoltaic inverter also include a parallel CAN interface, which is connected to the parallel CAN bus to enable inter-module communication between the energy storage converter and the photovoltaic inverter.

6. The AC low-voltage side coupled photovoltaic-storage power generation system according to claim 3, characterized in that, The energy storage converter and the photovoltaic inverter are also connected to a high-frequency synchronous bus, and the switching transistors in the energy storage converter and the photovoltaic inverter are synchronously driven based on the high-frequency synchronous bus.

7. The AC low-voltage side coupled photovoltaic-storage power generation system according to claim 3, characterized in that, The energy storage converter and the photovoltaic inverter are also connected to the power frequency synchronization bus, and the phase synchronization adjustment of the energy storage converter and the photovoltaic inverter is performed based on the power frequency synchronization bus.

8. The AC low-voltage side coupled photovoltaic-storage power generation system according to any one of claims 1 to 7, characterized in that, The energy storage converter module operates in grid-connected mode.

9. The AC low-voltage side coupled photovoltaic-storage power generation system according to any one of claims 1 to 7, characterized in that, When the system includes multiple energy storage converter modules and photovoltaic inverter modules, the multiple energy storage converter modules and photovoltaic inverter modules are simultaneously installed in the same installation equipment.

10. An installation device, characterized in that, The installation equipment is used to install the AC low-voltage side-coupled photovoltaic-storage power generation system according to any one of claims 1 to 9.

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