A photovoltaic energy storage inverter auxiliary power supply system and photovoltaic energy storage inverter

Abstract

The utility model provides a kind of photovoltaic energy storage inverter auxiliary source system and photovoltaic energy storage inverter, its system includes: bus auxiliary source, AC auxiliary source, battery auxiliary source and one-way passage module;The input end of bus auxiliary source is electrically connected with the output end of one-way passage module;The output end of AC auxiliary source is electrically connected with the first input end of one-way passage module;The output end of battery auxiliary source is electrically connected with the second input end of one-way passage module;The third input end of one-way passage module is electrically connected with the output end of photovoltaic cell panel;One-way passage module is used to select any power supply in photovoltaic cell panel, AC auxiliary source and battery auxiliary source as bus auxiliary source energy supply.This system supplies energy for bus auxiliary source by photovoltaic cell panel, battery auxiliary source and AC auxiliary source three ways, can effectively avoid auxiliary power supply system under insufficient light condition inverter frequent restart, and without additional configuration enable switch circuit control between each auxiliary source coordination, so that it can automatically switch operating mode.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic technology, and in particular to a photovoltaic energy storage inverter auxiliary power system and a photovoltaic energy storage inverter. Background Technology

[0002] With the development of new energy sources, the application of solar energy is becoming increasingly widespread, especially in single-phase photovoltaic inverters. Non-isolated photovoltaic inverters, lacking a power frequency isolation transformer, are smaller and more efficient, making them the mainstream architecture for photovoltaic inverters. However, due to the influence of sunlight and the environment, the power supply from photovoltaic panels to the inverter is unstable, with significant power fluctuations, which can even affect the operation of auxiliary power sources, causing the inverter to constantly restart and malfunction. The common practice is to rectify the power supply through a rectifier bridge on the grid side, then supply power to the bus via relay control and a PTC, which in turn supplies power to the auxiliary power source drawing power from the bus. However, this solution has safety risks due to the use of normally closed relays, which cannot determine if the machine is faulty when the auxiliary power source fails. Furthermore, the PTC resistors used have high losses, low system efficiency, and increased standby power consumption. Moreover, due to the influence of sunlight and the environment, the power supply from photovoltaic panels to the inverter is unstable, with significant power fluctuations, which can even affect the operation of auxiliary power sources, causing the inverter to constantly restart and malfunction. Utility Model Content

[0003] This utility model provides a photovoltaic energy storage inverter auxiliary power system and a photovoltaic energy storage inverter, aiming to solve the problem in related technologies where insufficient power supply to the photovoltaic port caused by changes in photovoltaic panel light intensity and ambient temperature leads to continuous restart of the bus auxiliary power supply.

[0004] To address the aforementioned technical problems, the first aspect of this utility model provides a photovoltaic energy storage inverter auxiliary power system, comprising: The system includes a bus auxiliary power source, an AC auxiliary power source, a battery auxiliary power source, and a unidirectional path module. The input terminal of the bus auxiliary power source is electrically connected to the output terminal of the unidirectional path module. The output terminal of the AC auxiliary power source is electrically connected to the first input terminal of the unidirectional path module. The output terminal of the battery auxiliary power source is electrically connected to the second input terminal of the unidirectional path module. The third input terminal of the unidirectional path module is electrically connected to the output terminal of the photovoltaic panel. The unidirectional path module is used to select any one of the photovoltaic panel, the AC auxiliary power source, and the battery auxiliary power source to power the bus auxiliary power source.

[0005] Furthermore, the unidirectional path module is an OR gate selection circuit composed of diodes.

[0006] Furthermore, the unidirectional path module includes a first diode, a second diode, and a third diode; The anode of the first diode is electrically connected to the output terminal of the photovoltaic panel; The anode of the second diode is electrically connected to the output terminal of the AC auxiliary power source; The anode of the third diode is electrically connected to the output terminal of the battery auxiliary power source; The cathodes of the first diode, the second diode, and the third diode are connected together and electrically connected to the input terminal of the bus auxiliary power source.

[0007] Furthermore, it also includes a maximum power point tracking module, the input terminal of which is electrically connected to the output terminal of the photovoltaic panel, and the output terminal of which is electrically connected to the third input terminal of the unidirectional path module.

[0008] Furthermore, the maximum power point tracking module includes an energy storage inductor, a capacitor unit, a fourth diode, and a switching transistor; The first terminal of the energy storage inductor is electrically connected to the positive electrode of the photovoltaic panel, and the second terminal of the energy storage inductor is electrically connected to the first terminal of the switching transistor and the anode of the fourth diode. The second end of the switching transistor is electrically connected to the negative electrode of the photovoltaic panel; The cathode of the fourth diode is electrically connected to the first terminal of the capacitor unit, and together they form the positive output terminal of the maximum power point tracking module. The second end of the capacitor unit is electrically connected to the negative terminal of the photovoltaic panel, and forms the negative output terminal of the maximum power point tracking module.

[0009] Furthermore, the first DC voltage output by the photovoltaic panel, the second DC voltage output by the battery auxiliary power source, and the third DC voltage output by the AC auxiliary power source have different voltage levels.

[0010] Furthermore, the voltage level of the first DC voltage is higher than the voltage level of the second DC voltage, and the voltage level of the second DC voltage is higher than the voltage level of the third DC voltage.

[0011] Furthermore, the output end of the bus auxiliary power source is provided with multiple terminals, and the bus auxiliary power source is electrically connected to the inverter chip, control unit, relay coil and MOSFET drive circuit through the terminals respectively.

[0012] Furthermore, the AC auxiliary power source includes a rectifier circuit, the input terminal of which is electrically connected to the AC power grid, and the output terminal of which is electrically connected to the first input terminal of the unidirectional path module.

[0013] The second aspect of this utility model provides a photovoltaic energy storage inverter, including a photovoltaic energy storage inverter auxiliary power system as described in any one of the above claims.

[0014] As can be seen from the above description, compared with related technologies, this utility model constructs a photovoltaic energy storage inverter auxiliary power system, which supplies power to the bus auxiliary power source through three methods: photovoltaic panels, battery auxiliary power source and AC auxiliary power source. It can adapt to various usage conditions such as no battery or no grid conditions, effectively avoid the inverter frequently restarting under insufficient light conditions, and can still work normally in complex and harsh working environments. Moreover, it does not require additional configuration of enable switch circuit to control the coordinated work between the auxiliary power sources, so that they can automatically switch working modes, forming a simple, stable and efficient photovoltaic energy storage inverter auxiliary power system. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a photovoltaic energy storage inverter auxiliary power system provided in the first aspect of the present invention; Figure 2 This is a detailed structural schematic diagram of a photovoltaic energy storage inverter auxiliary power system provided in the first aspect of the present invention; Figure 3 This is a schematic diagram of another detailed photovoltaic energy storage inverter auxiliary power system provided in the first aspect of the present invention; Figure 4 This is a structural schematic diagram of another detailed photovoltaic energy storage inverter auxiliary power system provided in the first aspect of the present utility model. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Throughout the description, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. Furthermore, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0017] With the development of new energy sources, the application of solar energy is becoming increasingly widespread, especially in single-phase photovoltaic inverters. Non-isolated photovoltaic inverters, lacking a power frequency isolation transformer, are smaller and more efficient, making them the mainstream architecture for photovoltaic inverters. However, due to the influence of sunlight and the environment, the power supply from photovoltaic panels to the inverter is unstable, with significant power fluctuations, which can even affect the operation of auxiliary power sources, causing the inverter to constantly restart and malfunction. The common practice is to rectify the power supply through a rectifier bridge on the grid side, then supply power to the bus via relay control and a PTC, which in turn supplies power to the auxiliary power source drawing power from the bus. However, this solution has safety risks due to the use of normally closed relays, which cannot determine if the machine is faulty when the auxiliary power source fails. Furthermore, the PTC resistors used have high losses, low system efficiency, and increased standby power consumption. Moreover, due to the influence of sunlight and the environment, the power supply from photovoltaic panels to the inverter is unstable, with significant power fluctuations, which can even affect the operation of auxiliary power sources, causing the inverter to constantly restart and malfunction.

[0018] As can be seen from the above, in the relevant technologies, the auxiliary power system of photovoltaic energy storage inverter has the problem of insufficient power supply to the photovoltaic port due to changes in the photovoltaic panel's light intensity and ambient temperature, causing the auxiliary power supply of the bus to restart continuously. To address this, this utility model embodiment provides a photovoltaic energy storage inverter auxiliary power system.

[0019] like Figure 1 The diagram shows a structural schematic of a photovoltaic energy storage inverter auxiliary power system provided in the first aspect of this utility model. The photovoltaic energy storage inverter auxiliary power system includes a bus auxiliary power source 101, an AC auxiliary power source 102, a battery auxiliary power source 103, and a unidirectional path module 104. The input terminal of the bus auxiliary power source 101 is electrically connected to the output terminal of the unidirectional path module 104. The output terminal of the AC auxiliary power source 102 is electrically connected to the first input terminal of the unidirectional path module 104. The output terminal of the battery auxiliary power source 103 is electrically connected to the second input terminal of the unidirectional path module 104. The third input terminal of the unidirectional path module 104 is electrically connected to the output terminal of the photovoltaic panel. The unidirectional path module 104 is used to select any one of the photovoltaic panel, the AC auxiliary power source 102, and the battery auxiliary power source 103 to power the bus auxiliary power source.

[0020] Specifically, in this embodiment, the bus auxiliary power source serves as the core output unit of the entire auxiliary power source system. Its input terminal is electrically connected to the output terminal of the unidirectional path module. It receives electrical energy transmitted from the unidirectional path module and converts the electrical energy into a supply voltage suitable for the core components of the photovoltaic energy storage inverter, such as the inverter chip and control unit, providing stable power to the core components. The AC auxiliary power source, as one of the power sources, has its output terminal electrically connected to the first input terminal of the unidirectional path module. It obtains electrical energy from the external AC power grid, converts the AC energy into DC energy, and transmits it to the unidirectional path module, serving as an alternative power source for the bus auxiliary power source. The battery auxiliary power source, as another power source, has its output terminal electrically connected to the second input terminal of the unidirectional path module. It obtains electrical energy from the energy storage batteries of the photovoltaic energy storage system and outputs DC energy directly or after voltage regulation to the unidirectional path module, serving as another alternative power source for the bus auxiliary power source. Unidirectional Path Module: As a power supply selection unit, it has three input terminals and one output terminal; among them, the third input terminal of the unidirectional path module is electrically connected to the output terminal of the photovoltaic panel, and is used to receive the photovoltaic power output by the photovoltaic panel, so that the photovoltaic panel becomes the third alternative power supply for the bus auxiliary power supply.

[0021] In detail, the core function of the unidirectional path module is to select any one of the three power sources with power supply capability based on the real-time power supply status of the photovoltaic panel, AC auxiliary power source, and battery auxiliary power source, and transmit the electrical energy output by the power source to the input terminal of the bus auxiliary power source to power the bus auxiliary power source. This ensures that no matter whether a single power source fails or stops operating, there is at least one power source to continuously supply power to the bus auxiliary power source, thus avoiding power outages to the bus auxiliary power source.

[0022] The photovoltaic energy storage inverter auxiliary power system in this embodiment solves the problem of easy interruption caused by existing auxiliary power systems relying on a single power supply by setting up three power sources: AC auxiliary power, battery auxiliary power, and photovoltaic panels, and using a one-way path module to select any power source. This significantly improves the power supply reliability of the auxiliary power system. At the same time, each power source is connected to the bus auxiliary power source through the one-way path module, which is simple in structure, does not require complex multi-power source switching control logic, is easy to implement in engineering, and is suitable for photovoltaic energy storage inverter application scenarios of different scales.

[0023] In some embodiments of this application, the unidirectional path module is an OR gate circuit composed of diodes.

[0024] Specifically, by utilizing the unidirectional conduction characteristic of diodes, the power transmission paths corresponding to the photovoltaic panel, AC auxiliary power source, and battery auxiliary power source are made into unidirectional channels, allowing only the power output from each power source to be transmitted towards the bus auxiliary power source. This avoids reverse currents between different power sources due to voltage differences and other factors, thereby preventing mutual interference between power sources. At the same time, as long as any of the photovoltaic panel, AC auxiliary power source, and battery auxiliary power source has a qualified power supply capability, that is, the output power meets the input requirements of the bus auxiliary power source, the diode corresponding to that power source will conduct, transmitting power to the bus auxiliary power source. This enables any power source to supply power to the bus auxiliary power source without the need for additional complex control switches or logic judgment units; the automatic selection of power sources can be completed solely through the hardware characteristics of the diodes.

[0025] Furthermore, such as Figure 2 The diagram shown is a detailed structural schematic of a photovoltaic energy storage inverter auxiliary power system provided in the first aspect of this utility model. Please refer to [link / reference]. Figure 2 The unidirectional path module includes a first diode D1, a second diode D2, and a third diode D3; the anode of the first diode D1 is electrically connected to the output terminal of the photovoltaic panel; the anode of the second diode D2 is electrically connected to the output terminal of the AC auxiliary power source 102; the anode of the third diode D3 is electrically connected to the output terminal of the battery auxiliary power source 103; the cathodes of the first diode D1, the second diode D2, and the third diode D3 are connected together and electrically connected to the input terminal of the bus auxiliary power source 101.

[0026] Specifically, the anode of the first diode D1 is electrically connected to the output terminal of the photovoltaic panel to receive the electrical energy output by the photovoltaic panel, forming a unidirectional channel for the transmission of photovoltaic power to the auxiliary power source of the bus. The anode of the second diode D2 is electrically connected to the output terminal of the AC auxiliary power source to receive the DC power converted from the AC auxiliary power source, forming a unidirectional channel for the transmission of AC power to the auxiliary power source of the bus. The anode of the third diode D3 is electrically connected to the output terminal of the battery auxiliary power source to receive the electrical energy output by the battery auxiliary power source, forming a unidirectional channel for the transmission of energy from the energy storage battery side to the auxiliary power source of the bus. The cathodes of the first diode D1, the second diode D2, and the third diode D3 are connected in a common connection manner, and this common connection node is electrically connected to the input terminal of the auxiliary power source of the bus.

[0027] In detail, based on the unidirectional conductivity of diodes, when any of the photovoltaic panel, AC auxiliary power source, or battery auxiliary power source has sufficient power supply capability, its output voltage will cause the anode voltage of the corresponding diode to be higher than the cathode voltage, causing the diode to conduct and power to be transmitted to the bus auxiliary power source through the common connection node. Meanwhile, the diodes corresponding to power sources that do not have sufficient power supply capability remain in the off state due to insufficient anode voltage or reverse polarity, thus avoiding reverse current interference between different power sources. This specific structure requires no additional control unit; the core function of selecting any power source to power the bus auxiliary power source can be achieved solely through hardware connection, while ensuring a simple circuit structure and high reliability.

[0028] like Figure 3 The diagram shown is a further detailed structural schematic of a photovoltaic energy storage inverter auxiliary power system provided in the first aspect of the present invention. Please refer to [link / reference]. Figure 3 It also includes a maximum power point tracking module 105, the input terminal of which is electrically connected to the output terminal of the photovoltaic panel, and the output terminal of the maximum power point tracking module 105 is electrically connected to the third input terminal of the unidirectional path module 104.

[0029] Specifically, in this embodiment, the power transmission path between the photovoltaic panel and the unidirectional path module is refined by adding a maximum power point tracking (MPPT) module to improve the utilization efficiency of photovoltaic power. The input terminal of the MPPT module is electrically connected to the output terminal of the photovoltaic panel to directly collect the DC power output by the photovoltaic panel; the output terminal of this module is electrically connected to the third input terminal of the unidirectional path module, so that the photovoltaic power regulated by the MPPT module can be transmitted to the unidirectional path module, and finally, the unidirectional path module can be used to supply power to the auxiliary power source of the bus through its selection function.

[0030] The output power of photovoltaic (PV) panels is easily affected by external factors such as light intensity and ambient temperature, and the matching relationship between their output voltage and current changes dynamically, making it difficult to maintain the actual output power stably at the theoretical maximum power value. The maximum power point tracking (MPPT) module added in this embodiment can detect the output voltage and current of the PV panel in real time. By dynamically adjusting the power conversion parameters, it ensures that the PV panel always operates under the condition of maximum output power, optimizing the output power of the PV panel into stable and maximized DC power before transmitting it to the unidirectional path module.

[0031] like Figure 4 The diagram shown is a further detailed structural schematic of a photovoltaic energy storage inverter auxiliary power system provided in the first aspect of the present invention. Please refer to [link / reference]. Figure 4The maximum power point tracking module includes an energy storage inductor L, a capacitor unit C, a fourth diode D4, and a switching transistor Q1. The first terminal of the energy storage inductor L is electrically connected to the positive terminal of the photovoltaic panel, and the second terminal of the energy storage inductor L is electrically connected to the first terminal of the switching transistor Q1 and the anode of the fourth diode D4. The second terminal of the switching transistor Q1 is electrically connected to the negative terminal of the photovoltaic panel. The cathode of the fourth diode D4 is electrically connected to the first terminal of the capacitor unit C, and together they form the positive output terminal of the maximum power point tracking module 105. The second terminal of the capacitor unit C is electrically connected to the negative terminal of the photovoltaic panel, and together they form the negative output terminal of the maximum power point tracking module 105.

[0032] Specifically, in this embodiment, the energy storage inductor L is the core component for energy storage and conversion, and the charging and discharging cycle is realized by controlling the switching of the switching transistor Q1. When switch Q1 is turned on, the photovoltaic panel charges the energy storage inductor L, storing electrical energy in the form of magnetic energy. When switch Q1 is turned off, the energy storage inductor L releases magnetic energy, which discharges to capacitor unit C through the fourth diode D4, completing the conversion and transmission of electrical energy. Switch Q1 is a control element, and its on / off state is regulated by the module's control logic. By changing the duty cycle, it adapts to the real-time output characteristics of the photovoltaic panel, keeping the photovoltaic panel operating at its maximum power point. The fourth diode D4 utilizes unidirectional conductivity to prevent the electrical energy in capacitor unit C from flowing back into the energy storage inductor L when switch Q1 is turned on, thus avoiding energy loss. On the other hand, it ensures that when switch Q1 is turned off, the electrical energy released by the energy storage inductor L is transmitted only to capacitor unit C, ensuring a unique energy conversion path. Capacitor unit C is a filter element that filters the electrical energy transmitted by the fourth diode D4, reducing voltage fluctuations and outputting stable DC power, ensuring that the power quality output from the module to the unidirectional path module meets the input requirements of the bus auxiliary power source.

[0033] Furthermore, the first DC voltage output by the photovoltaic panel, the second DC voltage output by the battery auxiliary power source, and the third DC voltage output by the AC auxiliary power source have different voltage levels.

[0034] Specifically, the DC voltage output by the photovoltaic panel is defined as the first DC voltage, the DC voltage output by the battery auxiliary power source is defined as the second DC voltage, and the DC voltage output by the AC auxiliary power source is defined as the third DC voltage. Among them, different voltage levels refer to the nominal output values ​​and operating voltage ranges of the first DC voltage, the second DC voltage, and the third DC voltage being non-overlapping or clearly distinguishable. There is no situation where the three nominal values ​​are the same and the operating ranges completely overlap, ensuring that the three have distinguishable voltage attributes in terms of power output characteristics.

[0035] Furthermore, the voltage level of the first DC voltage is higher than the voltage level of the second DC voltage, and the voltage level of the second DC voltage is higher than the voltage level of the third DC voltage.

[0036] Specifically, the order of the output DC voltages of the three components is as follows: First DC voltage (PV panel output) > Second DC voltage (battery auxiliary power output) > Third DC voltage (AC auxiliary power output). Based on this order, when the PV panel has power supply capability, its corresponding first diode D1 has the highest anode voltage and conducts first. The PV power is transmitted to the bus auxiliary power source via the unidirectional path module. At this time, because the anode voltage of the battery auxiliary power source and the AC auxiliary power source is lower than that of the PV side, the corresponding second diode D2 and third diode D3 are cut off to avoid reverse power consumption. If the PV panel's power supply is insufficient, the first DC voltage drops below the second DC voltage. Then, the first diode D1 is cut off, and the second diode D2 corresponding to the battery auxiliary power source conducts because its anode voltage (second DC voltage) is higher than the third DC voltage, switching to battery auxiliary power supply. Only when neither the PV nor the battery can supply power does the third diode D3 corresponding to the AC auxiliary power source conduct to ensure uninterrupted bus auxiliary power supply. This sorting method requires no additional control unit; it achieves automatic priority switching of power supply solely through voltage gradient and diode characteristics, making it fully compatible with the selection logic of unidirectional path modules.

[0037] In practice, when all three voltages are present at the same time, and the sunlight is weak in the early morning or evening, the photovoltaic panel has a very weak load-carrying capacity or may not even be able to power the auxiliary power supply. Once the auxiliary power supply starts working, the PV voltage will be pulled down to a level lower than the minimum input voltage of the bus auxiliary source. At this time, the three voltage values ​​will become V2 > V1 > Vbus. At this time, diodes D1 and D2 are reverse biased, and D3 is conducting. The system automatically switches to battery auxiliary power to supply the bus auxiliary power, ensuring the bus auxiliary power supply does not fail. During daytime with sufficient sunlight, Vbus > V2 > V1. In this state, diodes D2 and D3 are reverse biased, and D4 is conducting. Both the AC auxiliary power supply and the battery auxiliary power supply switch to an unloaded, standby state due to no load consumption. The bus auxiliary power supply is directly supplied by the photovoltaic system through the MPPT circuit, making this the most economical approach and avoiding the consumption of battery energy storage and grid energy. At night, when the battery has energy, the bus auxiliary power supply still comes from the battery. When the battery fails or its charge is too low to power the auxiliary power supply, V1 > V2 & Vbus. In this state, diodes D1 and D3 are reverse biased, and D2 is conducting. The auxiliary power system automatically switches to AC auxiliary power to supply the bus auxiliary power supply, ensuring the energy storage inverter control circuit continues to operate normally.

[0038] In some embodiments of this application, the output end of the bus auxiliary power source is provided with multiple terminals, and the bus auxiliary power source is electrically connected to the inverter chip, control unit, relay coil and MOSFET drive circuit respectively through the terminals.

[0039] Specifically, considering the operational requirements of non-isolated high-voltage energy storage converters, multiple core components need to operate collaboratively, and the power supply interfaces and voltage requirements of different components vary. Therefore, multiple terminals are installed at the output end of the bus auxiliary power supply, with each terminal corresponding to the power supply requirements of a specific core component. This achieves precise one-to-one or group power supply between the bus auxiliary power supply and each component, avoiding power supply conflicts or increased connection complexity caused by a single output interface, while also improving power supply reliability and maintenance convenience.

[0040] In some embodiments of this application, the AC auxiliary power source includes a rectifier circuit, the input terminal of which is electrically connected to the AC power grid, and the output terminal of which is electrically connected to the first input terminal of the unidirectional path module.

[0041] Specifically, the input terminal of the rectifier circuit is electrically connected to the external AC power grid to receive AC power output from the grid, such as 220V or 380V AC power, adapting to the grid access specifications of the non-isolated high-voltage energy storage converter. The output terminal of the rectifier circuit is electrically connected to the first input terminal of the unidirectional path module to convert the received AC power into DC power and transmit the DC power to the unidirectional path module, enabling the AC power grid to become one of the alternative power sources for the bus auxiliary power supply via the AC auxiliary power source. In summary, compared with related technologies, this utility model constructs a photovoltaic energy storage inverter auxiliary power system, which supplies power to the bus auxiliary power source through three methods: photovoltaic panels, battery auxiliary power, and AC auxiliary power. It can adapt to various usage conditions such as no battery or no grid conditions, effectively avoids frequent inverter restarts under insufficient light conditions, and can still work normally in complex and harsh working environments. Moreover, it does not require additional configuration of enable switch circuits to control the coordinated work between the auxiliary power sources, enabling them to automatically switch working modes, forming a simple, stable, and efficient photovoltaic energy storage inverter auxiliary power system.

[0042] A second aspect of this utility model also provides a photovoltaic energy storage inverter, including the photovoltaic energy storage inverter auxiliary power system in any of the above embodiments. This photovoltaic energy storage inverter can perform the functions of the photovoltaic energy storage inverter auxiliary power system in the above embodiments. Referring to the above embodiments, the specific modules have already been explained and will not be repeated here.

[0043] It should be noted that the various embodiments in this utility model are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0044] It should also be noted that, in the present invention, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0045] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined in the present invention may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A photovoltaic energy storage inverter auxiliary power system, characterized in that, include: Bus auxiliary power supply, AC auxiliary power supply, battery auxiliary power supply and unidirectional path module; The input terminal of the bus auxiliary power source is electrically connected to the output terminal of the unidirectional path module; the output terminal of the AC auxiliary power source is electrically connected to the first input terminal of the unidirectional path module; the output terminal of the battery auxiliary power source is electrically connected to the second input terminal of the unidirectional path module; and the third input terminal of the unidirectional path module is electrically connected to the output terminal of the photovoltaic panel. The unidirectional path module is used to select any one of the photovoltaic panel, the AC auxiliary power source, and the battery auxiliary power source to power the bus auxiliary power source.

2. The photovoltaic energy storage inverter auxiliary power system according to claim 1, characterized in that, The unidirectional path module is an OR gate selection circuit composed of diodes.

3. The photovoltaic energy storage inverter auxiliary power system according to claim 2, characterized in that, The unidirectional path module includes a first diode, a second diode, and a third diode; The anode of the first diode is electrically connected to the output terminal of the photovoltaic panel; The anode of the second diode is electrically connected to the output terminal of the AC auxiliary power source; The anode of the third diode is electrically connected to the output terminal of the battery auxiliary power source; The cathodes of the first diode, the second diode, and the third diode are connected together and electrically connected to the input terminal of the bus auxiliary power source.

4. The photovoltaic energy storage inverter auxiliary power system according to claim 1, characterized in that, It also includes a maximum power point tracking module, the input of which is electrically connected to the output of the photovoltaic panel, and the output of which is electrically connected to the third input of the unidirectional path module.

5. The photovoltaic energy storage inverter auxiliary power system according to claim 4, characterized in that, The maximum power point tracking module includes an energy storage inductor, a capacitor unit, a fourth diode, and a switching transistor; The first terminal of the energy storage inductor is electrically connected to the positive electrode of the photovoltaic panel, and the second terminal of the energy storage inductor is electrically connected to the first terminal of the switching transistor and the anode of the fourth diode. The second end of the switching transistor is electrically connected to the negative electrode of the photovoltaic panel; The cathode of the fourth diode is electrically connected to the first terminal of the capacitor unit, and together they form the positive output terminal of the maximum power point tracking module. The second end of the capacitor unit is electrically connected to the negative terminal of the photovoltaic panel, and forms the negative output terminal of the maximum power point tracking module.

6. The photovoltaic energy storage inverter auxiliary power system according to claim 3, characterized in that, The first DC voltage output by the photovoltaic panel, the second DC voltage output by the battery auxiliary power source, and the third DC voltage output by the AC auxiliary power source have different voltage levels.

7. The photovoltaic energy storage inverter auxiliary power system according to claim 6, characterized in that, The voltage level of the first DC voltage is higher than the voltage level of the second DC voltage, and the voltage level of the second DC voltage is higher than the voltage level of the third DC voltage.

8. The photovoltaic energy storage inverter auxiliary power system according to claim 1, characterized in that, The output end of the bus auxiliary power source is provided with multiple terminals, and the bus auxiliary power source is electrically connected to the inverter chip, control unit, relay coil and MOS transistor drive circuit through the terminals respectively.

9. The photovoltaic energy storage inverter auxiliary power system according to claim 1, characterized in that, The AC auxiliary power source includes a rectifier circuit, the input terminal of which is electrically connected to the AC power grid, and the output terminal of which is electrically connected to the first input terminal of the unidirectional path module.

10. A photovoltaic energy storage inverter, characterized in that, Includes the photovoltaic energy storage inverter auxiliary power system as described in any one of claims 1 to 9.

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