Photovoltaic energy storage inverter

Abstract

The embodiment of the present application discloses a photovoltaic energy storage inverter. The photovoltaic energy storage inverter comprises a photovoltaic interface, a power grid interface, an energy storage module and a control module; a direct current side electric energy conversion module, an alternating current side electric energy conversion module and a panel side electric energy conversion module; a direct current side auxiliary power supply and an alternating current side auxiliary power supply; an alternating current side drive power supply module and a direct current side drive power supply module; the control module is used for controlling the conduction state of the alternating current side drive power supply module and / or the direct current side drive power supply module under a preset working condition according to the state of the photovoltaic interface output electric energy and the electric quantity state of the energy storage module, so as to control at least one of the direct current side electric energy conversion module, the alternating current side electric energy conversion module and the panel side electric energy conversion module not to work. The technical scheme provided by the embodiment solves the problem that all power supply modules work in the normal operation and standby state of the existing photovoltaic energy storage inverter, which leads to large power consumption and reduces the overall efficiency of the photovoltaic energy storage inverter.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the photovoltaic technology field, in particular to a photovoltaic energy storage inverter. BACKGROUND

[0002] With the improvement of people's environmental protection consciousness, the proportion of new energy is also more and more heavy. Among them, photovoltaic power generation is more suitable for small power demand of family due to its less use limit. At present, the balcony photovoltaic energy storage form is mainly used in household inverters, which can not only generate electricity through photovoltaic panels, but also realize peak-shaving electricity through batteries, and can save electricity cost for users.

[0003] Due to the use scene of photovoltaic energy storage inverter, it needs to contain direct current side auxiliary power supply and alternating current side auxiliary power supply. The existing photovoltaic energy storage inverter usually works in normal operation and standby state, all power supply modules work, which has the problems of large power consumption and reducing the overall efficiency of photovoltaic energy storage inverter. SUMMARY

[0004] The embodiment of the present application provides a photovoltaic energy storage inverter to solve the problem that the existing photovoltaic energy storage inverter usually works in normal operation and standby state, all power supply modules work, which leads to large power consumption and reduces the overall efficiency of photovoltaic energy storage inverter.

[0005] In order to achieve the above technical problems, the present application adopts the following technical scheme:

[0006] The embodiment of the present application provides a photovoltaic energy storage inverter, which comprises:

[0007] A photovoltaic interface, a power grid interface, an energy storage module and a control module;

[0008] A direct current side power conversion module, an alternating current side power conversion module and a panel side power conversion module; the direct current side power conversion module, the alternating current side power conversion module and the panel side power conversion module are connected to a first node; the direct current side power conversion module is connected between the energy storage module and the first node; the alternating current side power conversion module is connected between the power grid interface and the first node; the panel side power conversion module is connected between the photovoltaic interface and the first node;

[0009] A direct current side auxiliary power supply and an alternating current side auxiliary power supply; the direct current side auxiliary power supply is connected with the energy storage module and the photovoltaic interface; the alternating current side auxiliary power supply is connected between the power grid interface and the first node; the control module is connected with the direct current side auxiliary power supply and the alternating current side auxiliary power supply respectively;

[0010] An alternating current side drive power supply module and a direct current side drive power supply module; the alternating current side drive power supply module is connected between the direct current side auxiliary power supply and the alternating current side power conversion module, and the control end of the alternating current side drive power supply module is connected with the control module;

[0011] The DC side drive power supply module is connected between the DC side auxiliary power supply and the DC side electric energy conversion module, and a control end of the DC side drive power supply module is connected with the control module;

[0012] The control module is configured to control a conduction state of the AC side drive power supply module and / or the DC side drive power supply module under a preset working condition according to a state of the output electric energy of the photovoltaic interface and a state of the electric quantity of the energy storage module, so as to control at least one of the DC side electric energy conversion module, the AC side electric energy conversion module and the panel side electric energy conversion module to be inoperable.

[0013] Optionally, the photovoltaic energy storage inverter further comprises:

[0014] The bus capacitor replaces the first node;

[0015] The DC side auxiliary power supply is connected with the bus capacitor;

[0016] The AC side auxiliary power supply is connected with the bus capacitor, and the bus capacitor is configured to decouple and provide energy buffering.

[0017] Optionally, the photovoltaic energy storage inverter further comprises:

[0018] The chip power supply module is connected between the DC side auxiliary power supply and the control module, and the chip power supply module is configured to supply power to the control module.

[0019] Optionally, the photovoltaic energy storage inverter further comprises:

[0020] The communication module is connected between the control module and the energy storage module;

[0021] The communication power supply module is connected between the DC side auxiliary power supply and the communication module, and a control end of the communication power supply module is connected with the control module;

[0022] The control module is configured to control a conduction state of the communication power supply module according to the state of the output electric energy of the photovoltaic interface and the state of the electric quantity of the energy storage module.

[0023] Optionally, the control module is configured to control the DC side auxiliary power supply and the AC side drive power supply module, the DC side drive power supply module and the communication power supply module to be in normal operation, and control the AC side auxiliary power supply to be turned off when the energy storage module is connected and in normal grid-connected operation; or

[0024] The control module is configured to control the communication power supply module and the AC side auxiliary power supply to be turned off, and control the DC side auxiliary power supply, the DC side drive power supply module and the AC side drive power supply module to be in normal operation when the energy storage module is not connected, only the photovoltaic interface is input and in normal grid-connected operation.

[0025] Optionally, the control module is configured to control the AC-side auxiliary power supply and the AC-side drive power supply to be turned off and control the DC-side auxiliary power supply, the DC-side drive power supply and the communication power supply to be normally operated when charging the energy storage module by taking power from the photovoltaic interface; or,

[0026] The control module is configured to control the AC-side auxiliary power supply to be turned off and control the DC-side auxiliary power supply, the DC-side drive power supply, the AC-side drive power supply and the communication power supply to be normally operated when charging the energy storage module by taking power from the grid interface.

[0027] Optionally, the control module is configured to control the DC-side auxiliary power supply, the chip power supply and the communication power supply to be normally operated and control the AC-side auxiliary power supply, the AC-side drive power supply and the DC-side drive power supply to be turned off when the energy storage module is connected and in a standby state.

[0028] The control module is further configured to control the DC-side auxiliary power supply and the chip power supply to be normally operated and control the AC-side auxiliary power supply, the AC-side drive power supply, the DC-side drive power supply and the communication power supply to be turned off when the energy storage module is not connected and in a standby state.

[0029] Optionally, the control module is configured to control the DC-side auxiliary power supply to be turned off and control the AC-side auxiliary power supply to be operated to charge the bus capacitor when the photovoltaic energy storage inverter is only connected to the grid interface.

[0030] Optionally, the DC-side drive power supply comprises:

[0031] a switching unit, an isolation unit and a filter unit;

[0032] The switching unit is connected between the power input end and the ground end, the control end of the switching unit is connected with the output end of the control module, the output end of the switching unit is connected with the input end of the isolation unit, and the output end of the isolation unit is connected with the input end of the filter unit.

[0033] The output end of the filter unit is connected with the DC-side energy conversion module.

[0034] Optionally, the AC-side drive power supply and the DC-side drive power supply have the same structure.

[0035] The communication power supply and the DC-side drive power supply have the same structure.

[0036] The photovoltaic energy storage inverter provided by the embodiment of the present application has the following advantages: the AC side driving power supply module is connected between the DC side auxiliary power supply and the AC side electric energy conversion module, and the DC side driving power supply module is connected between the DC side auxiliary power supply and the DC side electric energy conversion module; the control module can control the AC side driving power supply module and the DC side driving power supply module to be both conductive, or control the AC side driving power supply module to be disconnected and the DC side driving power supply module to be conductive, or control the AC side driving power supply module to be conductive and the DC side driving power supply module to be disconnected, so as to control at least one of the DC side electric energy conversion module, the AC side electric energy conversion module and the panel side electric energy conversion module to be inoperable, thereby ensuring the electric energy requirement of the photovoltaic energy storage inverter under different working conditions, reducing the power loss of the photovoltaic energy storage inverter under different working conditions, improving the energy utilization efficiency of the photovoltaic energy storage inverter, and reducing the power consumption of the photovoltaic energy storage inverter. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of the contents of the embodiments of the present application and the drawings.

[0038] Figure 1 is a structural schematic diagram of a photovoltaic energy storage inverter provided by the embodiment of the present application;

[0039] Figure 2 is a structural schematic diagram of another photovoltaic energy storage inverter provided by the embodiment of the present application;

[0040] Figure 3 is a working flow schematic diagram of a photovoltaic energy storage inverter provided by the embodiment of the present application;

[0041] Figure 4 is a structural schematic diagram of a DC side driving power supply module of a photovoltaic energy storage inverter provided by the embodiment of the present application. DETAILED DESCRIPTION

[0042] The present application will be further described in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings, but not all the structures.

[0043] Based on the above technical problems, the following solutions are proposed in the embodiment:

[0044] Figure 1 is a structural schematic diagram of a photovoltaic energy storage inverter provided by an embodiment of the present application. Referring to Figure 1 The photovoltaic energy storage inverter provided by the embodiment of the present application comprises a photovoltaic interface 1, a power grid interface 2, an energy storage module 3, and a control module 4, a direct-current side electric energy conversion module 5, an alternating-current side electric energy conversion module 6, and a panel side electric energy conversion module 7, a direct-current side auxiliary power supply 8 and an alternating-current side auxiliary power supply 9, an alternating-current side drive power supply module 10 and a direct-current side drive power supply module 11.

[0045] The direct-current side electric energy conversion module 5, the alternating-current side electric energy conversion module 6, and the panel side electric energy conversion module 7 are connected to a first node N1; the direct-current side electric energy conversion module 5 is connected between the energy storage module 3 and the first node N1; the alternating-current side electric energy conversion module 6 is connected between the power grid interface 2 and the first node N1; and the panel side electric energy conversion module 7 is connected between the photovoltaic interface 1 and the first node N1.

[0046] The direct-current side auxiliary power supply 8 is connected to the energy storage module 3 and the photovoltaic interface 1; the alternating-current side auxiliary power supply 9 is connected between the power grid interface 2 and the first node N1; and the control module 4 is connected to the direct-current side auxiliary power supply 8 and the alternating-current side auxiliary power supply 9 respectively.

[0047] The alternating-current side drive power supply module 10 is connected between the direct-current side auxiliary power supply 8 and the alternating-current side electric energy conversion module 6, and a control end of the alternating-current side drive power supply module 10 is connected to the control module 4. The direct-current side drive power supply module 11 is connected between the direct-current side auxiliary power supply 8 and the direct-current side electric energy conversion module 5, and a control end of the direct-current side drive power supply module 11 is connected to the control module 4.

[0048] The control module 4 is configured to control a conduction state of the alternating-current side drive power supply module 10 and / or the direct-current side drive power supply module 11 under a preset working condition according to a state of electric energy output by the photovoltaic interface 1 and an electric quantity state of the energy storage module 3, so as to control at least one of the direct-current side electric energy conversion module 5, the alternating-current side electric energy conversion module 6, and the panel side electric energy conversion module 7 to be inoperative.

[0049] Specifically, the photovoltaic interface 1 is configured to connect a photovoltaic panel. The photovoltaic interface 1 is configured to transmit electric energy from the photovoltaic panel to the photovoltaic energy storage inverter. The power grid interface 2 is connected to a power grid, and the power grid interface 2 is configured to transmit alternating-current electric energy to the photovoltaic energy storage inverter. The energy storage module 3 can comprise a battery, and the energy storage module 3 is configured to store electric energy. The energy storage module 3 can be charged by the photovoltaic panel through the panel side electric energy conversion module 7 and the direct-current side electric energy conversion module 5. The energy storage module 3 can be charged through the alternating-current side electric energy conversion module 6 and the direct-current side electric energy conversion module 5.

[0050] Since the AC side driving power supply module 10 is connected between the DC side auxiliary power supply 8 and the AC side energy conversion module 6, the control end of the AC side driving power supply module 10 is connected with the control module 4. The AC side driving power supply module 10 can be turned on according to the control signal of the control module 4, so as to control the AC side energy conversion module to be turned on. Alternatively, the AC side driving power supply module 10 can be turned off according to the control signal of the control module 4, so as to control the AC side energy conversion module to be turned off.

[0051] Since the DC side driving power supply module 11 is connected between the DC side auxiliary power supply 8 and the DC side energy conversion module 5, the control end of the DC side driving power supply module 11 is connected with the control module 4. The DC side driving power supply module 11 can be turned on according to the control signal of the control module 4, so as to control the DC side energy conversion module to be turned on. Alternatively, the DC side driving power supply module 11 can be turned off according to the control signal of the control module 4, so as to control the DC side energy conversion module to be turned off.

[0052] By setting the control module 4 to control the turn-on state of the AC side driving power supply module 10 and / or the DC side driving power supply module 11 according to the state of the output of the photovoltaic interface 1 and the state of the energy storage module 3, at least one of the DC side energy conversion module 5, the AC side energy conversion module 6 and the panel side energy conversion module 7 is controlled to be inoperative. In this way, when the photovoltaic interface 1 is input with electric energy or the energy storage module 3 stores electric energy, the AC side driving power supply module 10 is turned off, and only the DC side driving power supply module 11 is turned on to make the DC side energy conversion module 5 and the panel side energy conversion module 7 work, thereby reducing the power consumption of the AC side driving power supply module 10 and the AC side auxiliary power supply 9.

[0053] For example, when the photovoltaic interface 1 is not input with electric energy, the energy storage module 3 has no voltage, and the DC side auxiliary power supply 8 is turned off, the AC side auxiliary power supply 9 is powered on. In this way, the power needs of the photovoltaic energy storage inverter in different working conditions are guaranteed, and the power loss of the photovoltaic energy storage inverter in different working conditions is low.

[0054] The photovoltaic energy storage inverter provided by the embodiment comprises a control module 4, a photovoltaic panel interface 1, a storage module 3, an AC side auxiliary power supply 9, a DC side auxiliary power supply 8, an AC side power conversion module 6, a DC side power conversion module 5 and a panel side power conversion module 7.

[0055] Optionally, Figure 2 is another structural schematic diagram of the photovoltaic energy storage inverter provided by the embodiment. Based on the above embodiment, referring to Figure 2 , the photovoltaic energy storage inverter further comprises a bus capacitor 12, the bus capacitor 12 replaces the first node N1; the DC side auxiliary power supply 8 is connected with the bus capacitor 12; the AC side auxiliary power supply 9 is connected with the bus capacitor 12, and the bus capacitor 12 is used for decoupling and providing energy buffering.

[0056] Specifically, the bus capacitor 12 decouples and buffers the energy input by the grid interface 2, the energy input by the photovoltaic panel and the energy output by the storage module 3, so as to avoid the occurrence of ripple in the energy transmission process.

[0057] Optionally, based on the above embodiment, referring to Figure 2 , the photovoltaic energy storage inverter further comprises a chip power supply module 13, the chip power supply module 13 is connected between the DC side auxiliary power supply 8 and the control module 4, and the chip power supply module 13 is used for supplying power to the control module 4.

[0058] Specifically, the chip power supply module 13 can step down the energy of the DC side auxiliary power supply 8 and supply power to the control module 4.

[0059] Optionally, based on the above embodiment, referring to Figure 2The photovoltaic energy storage inverter further comprises a communication module 14 connected between the control module 4 and the energy storage module 3; and a communication power supply module 15 connected between the DC side auxiliary power supply 8 and the communication module 14, with the control end of the communication power supply module 15 connected to the control module 4; the control module 4 is configured to control the on-off state of the communication power supply module 15 according to the state of the photovoltaic interface 1 output power and the state of the energy storage module 3.

[0060] Specifically, the communication power supply module 15 converts the power from the DC side auxiliary power supply 8 to a lower voltage. The communication power supply module 15 supplies power to the communication module 14. When the communication power supply module 15 is powered on and supplies power to the communication module 14, the communication module 14 is in communication connection with the control module 4. The communication module 14 is connected between the energy storage module 3 and the control module 4, and can transmit the power information of the energy storage module 3 to the control module 4 and transmit the control signal generated by the control module 4 to the energy storage module 3. For example, the control module 4 can include a single-chip microcomputer or a DSP (Digital Signal Processor) controller.

[0061] In an alternative embodiment, the control module 4 can include a sampling unit, a clock unit and a DSP. The control module 4 can acquire information such as the voltage of the energy storage module 3 and the grid voltage in real time, determine the working state of the photovoltaic energy storage inverter, and thus control the on-off of each power supply module, such as the AC side drive power supply module 10, the DC side drive power supply module 11 and the communication power supply module 15.

[0062] In another alternative embodiment, the AC side auxiliary power supply 9 mainly includes a power management chip and peripheral circuit, a transformer, a MOS tube, an input rectifier circuit and an output rectifier circuit.

[0063] In yet another alternative embodiment, the power management chip of the AC side auxiliary power supply 9 has an enable pin connected to the input end of the AC side auxiliary power supply 9 through a resistor and also connected to the DSP.

[0064] More specifically, the control of the AC side auxiliary power supply 9 is realized by pulling down the potential of the enable pin; and the control of each power supply module is realized by controlling the input of the push-pull circuit in the DSP control module 4.

[0065] Optionally, Figure 3 is a working flowchart of the photovoltaic energy storage inverter provided by the embodiment of the present application. Based on the above embodiment, in combination with Figure 2 and Figure 3, the control module 4 is configured to control the DC side auxiliary power supply 8, the AC side drive power supply module 10, the DC side drive power supply module 11 and the communication power supply module 15 to work normally and control the AC side auxiliary power supply 9 to be turned off when the energy storage module 3 is connected and normally grid-connected; or the control module 4 is configured to control the communication power supply module 15 and the AC side auxiliary power supply 9 to be turned off and control the DC side auxiliary power supply 8, the DC side drive power supply module 11 and the AC side drive power supply module 10 to work normally when the energy storage module 3 is not connected and only the photovoltaic interface 1 input is connected and normally grid-connected.

[0066] Specifically, the control module 4 controls the DC side auxiliary power supply 8 to work normally when the energy storage module 3 has voltage and is normally grid-connected. The control module 4 sends a control signal, for example, a high-level signal, to the AC side drive power supply module 10, the DC side drive power supply module 11 and the communication power supply module 15, so that the AC side drive power supply module 10, the DC side drive power supply module 11 and the communication power supply module 15 work normally. At this time, the AC side auxiliary power supply 9 does not need to work, and the DSP sends a control signal, for example, a low-level signal, to the enable pin of the power management chip of the AC side auxiliary power supply 9, so as to control the AC side auxiliary power supply 9 to be turned off, and the AC side auxiliary power supply 9 does not work. In this way, the power consumption of the photovoltaic energy storage inverter can be reduced.

[0067] Another optional embodiment is that when the energy storage module 3 has no voltage and only the photovoltaic interface 1 input is connected and normally grid-connected, the control module 4 controls the communication power supply module 15 and the AC side auxiliary power supply 9 to be turned off and controls the DC side auxiliary power supply 8, the DC side drive power supply module 11 and the AC side drive power supply module 10 to work normally. In this way, the power consumption of the photovoltaic energy storage inverter can be further reduced.

[0068] Optionally, on the basis of the above embodiment, the photovoltaic energy storage inverter further comprises Figure 2 and Figure 3 The control module 4 is configured to control the AC side drive power supply module 10 and the AC side auxiliary power supply 9 to be turned off and control the DC side auxiliary power supply 8, the DC side drive power supply module 11 and the communication power supply module 15 to work normally when charging the energy storage module 3 from the photovoltaic interface 1; or the control module 4 is configured to control the AC side auxiliary power supply 9 to be turned off and control the DC side auxiliary power supply 8, the DC side drive power supply module 11, the AC side drive power supply module 10 and the communication power supply module 15 to work normally when charging the energy storage module 3 from the grid interface 2.

[0069] Specifically, when taking power from the photovoltaic interface 1 to charge the energy storage module 3, the control module 4 controls the AC side auxiliary power supply 9 to be turned off, and controls the DC side auxiliary power supply 8, the DC side drive power supply module 11, the AC side drive power supply module 10 and the communication power supply module 15 to work normally. When taking power from the grid interface 2 to charge the energy storage module 3, the control module 4 controls the AC side auxiliary power supply 9 to be turned off, and controls the DC side auxiliary power supply 8, the DC side drive power supply module 11, the AC side drive power supply module 10 and the communication power supply module 15 to work normally. In this way, the power consumption of the photovoltaic energy storage inverter can be further reduced.

[0070] Optionally, on the basis of the above embodiment, the photovoltaic energy storage inverter further comprises a control module 4, and the control module 4 is connected to the DC side auxiliary power supply 8, the AC side auxiliary power supply 9, the DC side drive power supply module 11, the AC side drive power supply module 10, the communication power supply module 15 and the energy storage module 3. Figure 2 and Figure 3 The control module 4 is configured to control the DC side auxiliary power supply 8, the chip power supply module 13 and the communication power supply module 15 to work normally, and control the AC side auxiliary power supply 9, the AC side drive power supply module 10 and the DC side drive power supply module 11 to be turned off when the energy storage module 3 is connected and in a standby state. The control module 4 is further configured to control the DC side auxiliary power supply 8 and the chip power supply module 13 to work normally, and control the AC side auxiliary power supply 9, the AC side drive power supply module 10, the DC side drive power supply module 11 and the communication power supply module 15 to be turned off when the energy storage module 3 is not connected and in a standby state.

[0071] Specifically, when the energy storage module 3 is connected and in a standby state, the control module 4 controls the DC side auxiliary power supply 8, the chip power supply module 13 and the communication power supply module 15 to work normally, and controls the AC side auxiliary power supply 9, the AC side drive power supply module 10 and the DC side drive power supply module 11 to be turned off. When the energy storage module 3 is not connected and in a standby state, the control module 4 controls the DC side auxiliary power supply 8 and the chip power supply module 13 to work normally, and controls the AC side auxiliary power supply 9, the AC side drive power supply module 10, the DC side drive power supply module 11 and the communication power supply module 15 to be turned off. In this way, the power consumption of the photovoltaic energy storage inverter can be further reduced.

[0072] Optionally, on the basis of the above embodiment, the photovoltaic energy storage inverter further comprises a control module 4, and the control module 4 is connected to the DC side auxiliary power supply 8, the AC side auxiliary power supply 9, the DC side drive power supply module 11, the AC side drive power supply module 10, the communication power supply module 15 and the energy storage module 3. Figure 2 and Figure 3 The control module 4 is configured to control the DC side auxiliary power supply 8 to be turned off, and control the AC side auxiliary power supply 9 to work to charge the bus capacitor 12 when the photovoltaic energy storage inverter is only connected to the grid interface 2.

[0073] Specifically, when the photovoltaic energy storage inverter is connected to the power grid only, the AC side grid voltage passes through the power grid interface 2 and is converted into a high-voltage DC voltage through the input rectifier circuit of the AC side auxiliary power supply 9. The high-voltage DC voltage is a high-level signal after passing through a resistor. The enable pin of the power management chip of the AC side auxiliary power supply 9 inputs the high-level signal. The power management chip of the AC side auxiliary power supply 9 is enabled. The AC side auxiliary power supply 9 starts to work. The output of the AC side auxiliary power supply 9 is connected to the bus capacitor 12 to charge the bus capacitor 12. When the voltage of the bus capacitor 12 reaches the starting voltage of the DC side auxiliary power supply 8, the DC side auxiliary power supply 8 starts to work to supply power to the control module 4. After the control module 4 normally operates for a preset period of time, for example, 5 seconds, the control module 4 outputs a low-level signal. The low-level signal output by the control module 4 is transmitted to the enable pin of the power management chip of the AC side auxiliary power supply 9, so as to turn off the AC side auxiliary power supply 9. In this way, the power consumption of the photovoltaic energy storage inverter can be further reduced.

[0074] In an alternative embodiment, referring back to Figure 3 The energy storage module can include a battery. The working process of the photovoltaic energy storage inverter is as follows:

[0075] S101, start.

[0076] S102, determine whether there is a voltage of the battery or the photovoltaic panel. If yes, execute S103; if no, execute S114.

[0077] S103, the DC side auxiliary power supply normally works.

[0078] S104, the AC side auxiliary power supply is controlled to be turned off.

[0079] S105, determine whether the inverter is in a grid-connected state. If yes, execute S106; if no, execute S108. The inverter refers to the photovoltaic energy storage inverter.

[0080] S106, each power supply module normally works. The power supply modules include the AC side drive power supply module 10, the DC side drive power supply module 11, and the communication power supply module 15.

[0081] S107, the inverter remains in the grid-connected state.

[0082] S108, determine whether the inverter is in a standby state. If yes, execute S109; if no, execute S111.

[0083] S109, turn off the DC side drive power supply module and the AC side power supply module. The DC side drive power supply module refers to the DC side drive power supply module, and the AC side power supply module refers to the AC side drive power supply module.

[0084] S110, the inverter remains in the standby state.

[0085] S111, the inverter charges the battery from the photovoltaic panel.

[0086] S112, the AC side drive power supply module is turned off. The AC side drive power supply module refers to the AC side drive power supply module.

[0087] S113, the inverter keeps charging.

[0088] S114, it is judged whether the power grid has voltage, if yes, S115 is executed, if not, S120 is executed.

[0089] S115, the AC side auxiliary power supply normally works.

[0090] S116, it is judged whether the inverter charges the battery from the power grid, if yes, S117 is executed, if not, S115 is executed.

[0091] S117, the DC side auxiliary power supply normally works.

[0092] S118, the AC side auxiliary power supply is controlled to be turned off.

[0093] S119, each power supply module normally works.

[0094] S120, the inverter does not work.

[0095] Optionally, Figure 4 is a structure diagram of a DC side drive power supply module of a photovoltaic energy storage inverter provided by the embodiment. On the basis of the above embodiment, in combination with Figure 2 and Figure 4 , the DC side drive power supply module 11 comprises a switching unit 21, an isolation unit 22 and a filter unit 23; the switching unit 21 is connected between a power supply input end and a ground end, a control end of the switching unit 21 is connected with an output end of the control module 4, an output end of the switching unit 21 is connected with an input end of the isolation unit 22, an output end of the isolation unit 22 is connected with an input end of the filter unit 23; an output end of the filter unit 23 is connected with the DC side energy conversion module 5.

[0096] Specifically, the switching unit 21 can comprise a push-pull circuit. The switching unit 21 can comprise a first switch tube Q1 and a second switch tube Q2, a first pole of the first switch tube Q1 is connected with the power supply input end Vin. A second pole of the first switch tube Q1 is connected with a first pole of the second switch tube Q2, a second pole of the second switch tube Q2 is grounded, a control end of the first switch tube Q1 and a control end of the second switch tube Q2 are connected with the control module 4. The isolation unit 22 can comprise a transformer. The filter unit 23 can comprise a resistance-capacitance filter, or comprise a capacitor C1. The control signal output by the control module can comprise a PWM signal. Figure 4The output end Vout of the DC side driving power supply module 11 is shown as an example.

[0097] An optional embodiment, on the basis of the above embodiment, continuing to refer to Figure 4 The DC side driving power supply module 11 can further include a unidirectional conduction unit D1, an anode of the unidirectional conduction unit D1 is connected with the output end of the isolation unit 22, and a cathode of the unidirectional conduction unit D1 is connected with the filter unit 23. The unidirectional conduction unit D1 can include a diode.

[0098] Another optional embodiment, on the basis of the above embodiment, continuing to refer to Figure 4 The DC side driving power supply module 11 can further include a current limiting resistor R1, the current limiting resistor R1 is connected between the control module 4 and the control end of the switch unit 21, and the current limiting resistor R1 is used for protecting the switch unit 21.

[0099] Optionally, on the basis of the above embodiment, in combination with Figure 2 and Figure 4 The AC side driving power supply module 10 and the DC side driving power supply module 11 have the same structure; the communication power supply module 15 and the DC side driving power supply module 11 have the same structure.

[0100] Specifically, the control signals output by the control module 4 can be used to control the conduction states of the AC side driving power supply module 10, the communication power supply module 15 and the DC side driving power supply module 11, so as to reduce the power consumption of the photovoltaic energy storage inverter. On the other hand, the AC side driving power supply module 10 and the communication power supply module 15 have the same structure as the DC side driving power supply module 11, which can reduce the manufacturing process of the photovoltaic energy storage inverter, reduce the manufacturing cost, and further improve the practicability of the photovoltaic energy storage inverter.

[0101] Note that the above are only preferred embodiments of the present application and the technical principles applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, re-adjustments and substitutions without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A photovoltaic energy storage inverter, characterized in that, comprise: a photovoltaic interface, a grid interface, an energy storage module and a control module; a direct current side power conversion module, an alternating current side power conversion module and a panel side power conversion module; the direct current side power conversion module, the alternating current side power conversion module and the panel side power conversion module are connected to a first node; the direct current side power conversion module is connected between the energy storage module and the first node; the alternating current side power conversion module is connected between the grid interface and the first node; the panel side power conversion module is connected between the photovoltaic interface and the first node; a direct current side auxiliary power supply and an alternating current side auxiliary power supply; the direct current side auxiliary power supply is connected with the energy storage module and the photovoltaic interface; the alternating current side auxiliary power supply is connected between the grid interface and the first node; the control module is connected with the direct current side auxiliary power supply and the alternating current side auxiliary power supply respectively; an alternating current side drive power supply module and a direct current side drive power supply module; the alternating current side drive power supply module is connected between the direct current side auxiliary power supply and the alternating current side power conversion module, and a control end of the alternating current side drive power supply module is connected with the control module; the direct current side drive power supply module is connected between the direct current side auxiliary power supply and the direct current side power conversion module, and a control end of the direct current side drive power supply module is connected with the control module; the control module is configured to control a conduction state of the alternating current side drive power supply module and / or the direct current side drive power supply module under a preset working condition according to a state of output power of the photovoltaic interface and a state of power of the energy storage module, so as to control at least one of the direct current side power conversion module, the alternating current side power conversion module and the panel side power conversion module to be inoperative.

2. The photovoltaic energy storage inverter of claim 1, wherein, The photovoltaic energy storage inverter further comprises: a bus capacitor, the bus capacitor replaces the first node; the direct current side auxiliary power supply is connected with the bus capacitor; the alternating current side auxiliary power supply is connected with the bus capacitor, and the bus capacitor is configured to decouple and provide energy buffering.

3. The photovoltaic energy storage inverter of claim 2, wherein, The photovoltaic energy storage inverter further comprises: a chip power supply module, the chip power supply module is connected between the direct current side auxiliary power supply and the control module, and the chip power supply module is configured to supply power to the control module.

4. The photovoltaic energy storage inverter of claim 3, wherein, The photovoltaic energy storage inverter further comprises: a communication module, connected between the control module and the energy storage module; a communication power supply module, connected between the direct current side auxiliary power supply and the communication module, and a control end of the communication power supply module is connected with the control module; the control module is configured to control a conduction state of the communication power supply module according to a state of output power of the photovoltaic interface and a state of power of the energy storage module.

5. The photovoltaic energy storage inverter according to claim 4, wherein the control module is configured to control the direct current side auxiliary power supply, the alternating current side drive power supply module, the direct current side drive power supply module and the communication power supply module to work normally and control the alternating current side auxiliary power supply to be turned off when the energy storage module is connected and normally connected to the grid; or the control module is configured to control the direct current side auxiliary power supply, the alternating current side drive power supply module, the direct current side drive power supply module and the communication power supply module to work normally and control the alternating current side auxiliary power supply to be turned off when the energy storage module is connected and normally connected to the grid; or The control module is configured to control the communication power supply module and the AC auxiliary power supply to be turned off and control the DC auxiliary power supply, the DC side drive power supply module and the AC side drive power supply module to work normally when the energy storage module is not connected, only the photovoltaic interface input is normal and grid-connected operation.

6. The photovoltaic energy storage inverter according to claim 4, characterized in that, the control module is configured to control the AC side drive power supply module and the AC auxiliary power supply to be turned off and control the DC auxiliary power supply, the DC side drive power supply module and the communication power supply module to work normally when charging the energy storage module by taking power from the photovoltaic interface; or, the control module is configured to control the AC auxiliary power supply to be turned off and control the DC auxiliary power supply, the DC side drive power supply module, the AC side drive power supply module and the communication power supply module to work normally when charging the energy storage module by taking power from the grid interface.

7. The photovoltaic energy storage inverter according to claim 4, characterized in that, the control module is configured to control the DC auxiliary power supply, the chip power supply module and the communication power supply module to work normally and control the AC auxiliary power supply, the AC side drive power supply module and the DC side drive power supply module to be turned off when the energy storage module is connected and in standby state; the control module is further configured to control the DC auxiliary power supply and the chip power supply module to work normally and control the AC auxiliary power supply, the AC side drive power supply module, the DC side drive power supply module and the communication power supply module to be turned off when the energy storage module is not connected and in standby state.

8. The photovoltaic energy storage inverter according to claim 4, characterized in that, the control module is configured to control the DC auxiliary power supply to be turned off and control the AC auxiliary power supply to work to charge the bus capacitor when only the grid interface of the photovoltaic energy storage inverter is connected.

9. The photovoltaic energy storage inverter according to claim 4, characterized in that, the DC side drive power supply module comprises: a switching unit, an isolation unit and a filter unit; the switching unit is connected between the power input end and the ground end, the control end of the switching unit is connected with the output end of the control module, the output end of the switching unit is connected with the input end of the isolation unit, the output end of the isolation unit is connected with the input end of the filter unit; the output end of the filter unit is connected with the DC side energy conversion module.

10. The photovoltaic energy storage inverter according to claim 9, characterized in that, the AC side drive power supply module has the same structure as the DC side drive power supply module; the communication power supply module has the same structure as the DC side drive power supply module.

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