Miniature photovoltaic inversion device and inversion system

Abstract

The utility model discloses a miniature photovoltaic inversion device and an inversion system. The miniature photovoltaic inversion device comprises at least two MPPT modules which are connected in parallel, a commutation module, a master control module and at least one slave control module. The MPPT module is connected between the photovoltaic panel and the commutation module; the master control module and the slave control module are connected with at least one MPPT module. The main control module is also connected with the power grid and the commutation module; the slave control module is also connected with the power grid and the commutation module; the master control module and the slave control module are used for collecting input parameters of the MPPT module; the main control module generates a first driving signal and a second driving signal according to the input parameters of each MPPT module; the main control module controls a part of switch tubes in the commutation module according to the first driving signal; and the slave control module controls the rest switch tubes in the commutation module according to the second driving signal. According to the embodiment of the utility model, the burden of the main control module is reduced, and the response speed of the miniature photovoltaic inverter is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, and in particular to a micro photovoltaic inverter device and an inverter system. Background Art

[0002] As traditional fossil energy becomes increasingly scarce, solar energy, as one of the important renewable energy sources, plays a pivotal role in the future energy system. The inverter is an indispensable key component in the photovoltaic system, mainly playing the role of converting DC into AC and tracking the maximum power point. At present, photovoltaic inverters are mainly divided into centralized inverters, string inverters and micro inverters. Micro photovoltaic inverters track the maximum power point of each component, which can solve the problem of low energy conversion efficiency of the entire system caused by mismatch of photovoltaic components due to aging, shading and other reasons, and the DC side voltage is low and the safety factor is high.

[0003] However, in the prior art, the micro photovoltaic inverter has high requirements for the control device. When there are many components in the micro photovoltaic inverter, the response speed of the micro photovoltaic inverter is slow. Utility Model Content

[0004] The utility model provides a micro photovoltaic inverter device and an inverter system to reduce the burden of a main control module and improve the response speed of the micro photovoltaic inverter device.

[0005] According to one aspect of the utility model, a micro photovoltaic inverter device is provided, the micro photovoltaic inverter device comprising:

[0006] At least two parallel MPPT modules, the input end of each MPPT module is connected to a photovoltaic panel; the MPPT module is used to track the maximum power of the photovoltaic panel and to increase the output voltage of the photovoltaic panel;

[0007] A phase-changing module, wherein the phase-changing module has a plurality of switch tubes; the output end of each of the MPPT modules is connected to the input end of the phase-changing module; the output end of the phase-changing module is connected to the power grid; the phase-changing module is used to invert the electric energy output by the MPPT module; the phase-changing module has at least two control ends;

[0008] A main control module, wherein the first driving end of the main control module is connected to at least one control end of the MPPT module; the first sampling end of the main control module is connected to the input end of the MPPT module connected to the first driving end of the main control module; the second sampling end of the main control module is connected to the power grid; the second driving end of the main control module is connected to the first control end of the phase-changing module;

[0009] At least one slave control module, the first driving end of the slave control module is connected to the control end of at least one of the MPPT modules; the first sampling end of the slave control module is connected to the input end of the MPPT module connected to the first driving end of the slave control module; the second sampling end of the slave control module is connected to the power grid; the second driving end of the slave control module is connected to the second control end of the phase-changing module; the communication end of the master control module is connected to the communication end of the slave control module;

[0010] The master control module and the slave control module are used to collect input parameters of the MPPT module connected thereto; the master control module is also used to summarize the input parameters of the MPPT module and generate a first drive signal and a second drive signal; the master control module controls part of the switch tubes in the phase-changing module according to the first drive signal; the slave control module controls the remaining switch tubes in the phase-changing module according to the second drive signal.

[0011] Optionally, the number of control terminals of the phase-changing module is the same as the sum of the number of the master control modules and the number of the slave control modules.

[0012] Optionally, the phase-changing module includes: an inverter;

[0013] The input end of the inverter is connected to the output end of each MPPT module; the output end of the inverter is connected to the power grid; one control end of the inverter is connected to the master control module; and the remaining control ends of the inverter are connected to each slave control module one by one.

[0014] Optionally, the MPPT module includes: a first flyback conversion circuit, a second flyback conversion circuit and a filter circuit;

[0015] The first flyback conversion circuit and the second flyback conversion circuit are connected in parallel; the input end of the filter circuit is connected to the output end of the photovoltaic panel; the output end of the filter circuit is connected to the input end of the first flyback conversion circuit;

[0016] The filter circuit is used to filter the direct current at the output end of the photovoltaic panel; the first flyback conversion circuit and the second flyback conversion circuit are used to boost the filtered direct current.

[0017] Optionally, the filtering circuit includes an electromagnetic compatibility filtering circuit.

[0018] Optionally, the number of the MPPT modules is the same as the number of photovoltaic panels; the input end of each MPPT module is connected to the output end of each photovoltaic panel in a one-to-one correspondence.

[0019] Optionally, the micro photovoltaic inverter device further includes: a low-pass filter module;

[0020] The low-pass filter module is arranged between the output end of the phase-changing module and the power grid;

[0021] The low-pass filter module is used to filter the alternating current output by the phase-changing module.

[0022] Optionally, the micro photovoltaic inverter device further includes: a power module;

[0023] The input end of the power module is connected to the output end of each photovoltaic panel; the first output end of the power module is connected to the power end of the master control module; the second output end of the power module is connected to the power end of the slave control module;

[0024] The power supply module is used to provide the required electric energy to the master control module and the slave control module.

[0025] Optionally, the power supply module includes: an anti-reverse unit and an auxiliary power supply unit;

[0026] The input end of the anti-reverse unit is connected to the positive end of each photovoltaic panel; the output end of the anti-reverse unit is connected to the positive input end of the auxiliary power supply unit; the negative input end of the auxiliary power supply unit is connected to the negative end of each photovoltaic panel; the first output end of the auxiliary power supply unit is connected to the power supply end of the main control module; the second output end of the auxiliary power supply unit is connected to the power supply end of the slave control module;

[0027] The anti-reverse unit is used to prevent reverse current; the auxiliary power supply unit is used to provide the required electric energy for the main control module and the slave control module.

[0028] Optionally, the anti-reverse unit includes a plurality of anti-reverse diodes;

[0029] The anti-reverse diode is connected to the photovoltaic panel in a one-to-one correspondence; the anode end of the anti-reverse diode is connected to the positive end of the photovoltaic panel; the cathode end of the anti-reverse diode is connected to the positive end of the auxiliary power supply unit.

[0030] According to another aspect of the present invention, an inverter system is further provided. The inverter system includes the micro photovoltaic inverter device described in any one of the above embodiments.

[0031] The embodiment of the utility model collects the input parameters of each MPPT module through the main control module and the slave control module. The main control module summarizes the collected input parameters of each MPPT module, and generates a first drive signal and a second drive signal according to the summarized input parameters of each MPPT module. The main control module drives part of the switch tubes in the phase-changing module according to the first drive signal, and the slave control module drives the remaining switch tubes in the phase-changing module according to the second drive signal to achieve the driving of the phase-changing module. The phase-changing module inverts the output electric energy of the MPPT module and outputs the inverted electric energy to the power grid. The embodiment of the utility model collects the input parameters of each MPPT module through the main control module and the slave control module, and drives the phase-changing module together through the main control module and the slave control module, and disperses the drive of the phase-changing module in the main control module and each slave control module, which is conducive to reducing the burden of the main control module and improving the response speed of the micro photovoltaic inverter device.

[0032] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present utility model, nor are they intended to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 It is a schematic diagram of a micro photovoltaic inverter device provided by an embodiment of the utility model;

[0035] Figure 2 It is a schematic diagram of another micro photovoltaic inverter device provided by an embodiment of the utility model;

[0036] Figure 3 It is a schematic diagram of another micro photovoltaic inverter device provided by an embodiment of the utility model;

[0037] Figure 4 It is a schematic diagram of another micro photovoltaic inverter device provided by an embodiment of the utility model;

[0038] Figure 5 It is a schematic diagram of an inverter system provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0040] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0041] The embodiment of the utility model provides a micro photovoltaic inverter device. The micro photovoltaic inverter device is suitable for a photovoltaic system, in which a master control module and a slave control module collect input parameters of an MPPT module and jointly drive a commutation module, which is beneficial to reducing the amount of data calculation of the master control module and improving the response speed of the micro photovoltaic inverter device. Figure 1 Schematic diagram of a micro photovoltaic inverter device provided by an embodiment of the utility model. Figure 1 The micro photovoltaic inverter device includes: at least two parallel MPPT modules 110, a phase change module 120, a master control module 130 and at least one slave control module 140.

[0042] The input end of the MPPT (Maximum Power Point Tracking) module 110 is connected to the photovoltaic panel 100; the MPPT module 110 is used to track the maximum power of the photovoltaic panel 100 and improve the output voltage of the photovoltaic panel 100; the phase-changing module 120 has a plurality of switch tubes; the output end of each MPPT module 110 is connected to the input end of the phase-changing module 120; the output end of the phase-changing module 120 is connected to the power grid 200; the phase-changing module 120 is used to invert the electric energy output by the MPPT module 110; the phase-changing module 120 has at least two control ends; the first driving end of the main control module 130 is connected to the control end of at least one MPPT module 110; the first sampling end of the main control module 130 is connected to the input end of the MPPT module 110 to which the first driving end of the main control module 130 is connected; the second sampling end of the main control module 130 is connected to the power grid 200; the second driving end of the main control module 130 is connected to the first control end of the phase-changing module 120 The first driving end of the slave control module 140 is connected to the control end of at least one MPPT module 110; the first sampling end of the slave control module 140 is connected to the input end of the MPPT module 110 to which the first driving end of the slave control module 140 is connected; the second sampling end of the slave control module 140 is connected to the power grid 200; the second driving end of the slave control module 140 is connected to the second control end of the phase-changing module 120; the communication end of the main control module 130 is connected to the communication end of the slave control module 140; the main control module 130 and the slave control module 140 are used to collect input parameters of the MPPT modules 110 connected thereto; the main control module 130 is also used to summarize the input parameters of the MPPT module 110 and generate a first driving signal and a second driving signal; the main control module 130 controls part of the switch tubes in the phase-changing module 120 according to the first driving signal; the slave control module 140 controls the remaining switch tubes in the phase-changing module 120 according to the second driving signal.

[0043] Specifically, the main control module 130 and the slave control module 140 respectively collect the input parameters of each MPPT module in the micro photovoltaic inverter device. Among them, the input parameters of the MPPT module include but are not limited to the input voltage and input current of the MPPT module. The MPPT module 110 connected to the main control module 130 is different from the MPPT module 110 connected to the slave control module 140, that is, the main control module 130 controls and collects input parameters of some MPPT modules 110 in the micro photovoltaic inverter device, and the slave control module 140 controls and collects input parameters of the remaining MPPT modules 110 in the micro photovoltaic inverter device. The main control module 130 obtains the input parameters of the MPPT modules collected by each slave control module 140 to summarize the input parameters of each MPPT module in the micro photovoltaic inverter device. The main control module 130 generates a drive signal according to the summarized input parameters of each MPPT module in the micro photovoltaic inverter device. Among them, the drive signal includes at least a first drive signal and a second drive signal. It should be noted that the first drive signal and the second drive signal are both used to drive the phase-changing module 120. The first drive signal drives part of the switch tubes in the phase-changing module 120, and the second drive signal drives the remaining switch tubes in the phase-changing module 120. Exemplarily, the first drive signal and the second drive signal have different control timings on the switch tubes. The slave control module 140 acquires the second drive signal. The master control module 130 drives part of the switch tubes in the phase-changing module 120 according to the first drive signal, and the slave control module 140 drives the remaining switch tubes in the phase-changing module 120 according to the second drive signal. The master control module 130 and the slave control module 140 drive the phase-changing module 120 together.

[0044] The MPPT module 110 tracks the maximum power of the photovoltaic panel 100 and boosts the output voltage of the photovoltaic panel 100. The electric energy output by each MPPT module 110 is output to the phase-changing module 120. The phase-changing module 120 inverts the input electric energy according to the control of the master control module 130 and the slave control module 140, and outputs the inverted electric energy to the power grid 200.

[0045] The embodiment of the utility model collects the input parameters of each MPPT module 110 through the main control module 130 and the slave control module 140. The main control module 140 summarizes the collected input parameters of each MPPT module 110, and generates a first drive signal and a second drive signal according to the summarized input parameters of each MPPT module 110. The main control module drives part of the switch tubes in the phase-changing module 120 according to the first drive signal, and the slave control module 140 drives the remaining switch tubes in the phase-changing module 120 according to the second drive signal to achieve the driving of the phase-changing module 120. The phase-changing module 120 inverts the output electric energy of the MPPT module and outputs the inverted electric energy to the power grid 200. The embodiment of the utility model collects the input parameters of each MPPT module 110 through the main control module 130 and the slave control module 140, and drives the phase change module 120 together through the main control module 130 and the slave control module 140, and disperses the drive of the phase change module 120 in the main control module 130 and each slave control module 140, which is beneficial to reduce the burden of the main control module 130 and improve the response speed of the micro photovoltaic inverter device.

[0046] On the basis of the above embodiments, optionally, the number of control terminals of the commutation module 120 is the same as the sum of the number of the master control modules 130 and the number of the slave control modules 140. Exemplarily, when there are multiple slave control modules 140, the number of drive signals generated by the master control module 130 is the same as the sum of the number of the master control modules 130 and the number of the slave control modules 140. For example, when there are n slave control modules 140, n≥1, the master control module 130 generates a first drive signal, a second drive signal, ... an nth drive signal, and the slave control module 140 drives the commutation module 120 according to the drive signal generated by the master control module 130.

[0047] Based on the above embodiments, optionally, the phase-changing module 120 includes: an inverter.

[0048] The input end of the inverter is connected to the output end of each MPPT module 110; the output end of the inverter is connected to the power grid 200; one control end of the inverter is connected to the master control module 130; and the remaining control ends of the inverter are connected one-to-one with each slave control module 140. Exemplarily, the inverter has multiple switch tubes, and the master control module 130 and the slave control module 140 can realize the inversion of the output power of the MPPT module 110 by controlling different switch tubes to be turned on at different times.

[0049] Figure 2 Schematic diagram of another micro photovoltaic inverter device provided by the embodiment of the utility model. Figure 2 The MPPT module 110 includes: a first flyback conversion circuit 111 , a second flyback conversion circuit 112 and a filter circuit 113 .

[0050] The first flyback conversion circuit 111 and the second flyback conversion circuit 112 are connected in parallel; the input end of the filter circuit 113 is connected to the output end of the photovoltaic panel 100; the output end of the filter circuit 100 is connected to the input end of the first flyback conversion circuit 111; the filter circuit 113 is used to filter the direct current at the output end of the photovoltaic panel 100; the first flyback conversion circuit 111 and the second flyback conversion circuit 112 are used to boost the filtered direct current.

[0051] Specifically, the filter circuit 113 filters the electric energy output by the photovoltaic panel 100 to suppress electromagnetic interference. Among them, the filter circuit 113 can be an EMC (Electro Magnetic Compatibility) filter circuit. The electric energy output by the filter circuit 113 is respectively input to the first flyback conversion circuit 111 and the second flyback conversion circuit 112. The first flyback conversion circuit 111 and the second flyback conversion circuit 112 boost the output electric energy of the filter circuit 113. The design of the first flyback conversion circuit 111 and the second flyback conversion circuit 112 in parallel is conducive to improving the boost power of the MPPT module 110. Exemplarily, the first flyback conversion circuit 111 and the second flyback conversion circuit 112 can be composed of a flyback transformer, a switch tube and a diode.

[0052] Optionally, the first flyback conversion circuit 111 and the second flyback conversion circuit 112 can both independently boost the electric energy output by the photovoltaic panel 100. The redundant design of the first flyback conversion circuit 111 and the second flyback conversion circuit 112 enables the MPPT module 110 to still work when one of the flyback conversion circuits fails, which is beneficial to improving the operating stability of the MPPT module 110.

[0053] Based on the above embodiments, optionally, continue to refer to Figure 2 , the number of MPPT modules 110 is the same as the number of photovoltaic panels 100; the input end of each MPPT module 110 is connected to the output end of each photovoltaic panel 100 in a one-to-one correspondence.

[0054] Figure 3 Schematic diagram of another micro photovoltaic inverter device provided by the embodiment of the utility model. Based on the above embodiments, optionally, refer to Figure 3 The micro photovoltaic inverter device further includes a low-pass filter module 150. The low-pass filter module 150 is disposed between the output end of the phase-changing module 120 and the power grid 200; the low-pass filter module 150 is used to filter the alternating current outputted from the phase-changing module 120.

[0055] Specifically, the low-pass filter module 150 filters the harmonics of the electric energy output by the commutation module 120 and suppresses the high-frequency noise in the electric energy to improve the quality of the grid-connected current, thereby improving the stability of the operation of the grid 200. Exemplarily, the low-pass filter module 150 may include an LC filter circuit.

[0056] Figure 4 Schematic diagram of another micro photovoltaic inverter device provided by the embodiment of the utility model. Based on the above embodiments, optionally, refer to Figure 4 The micro photovoltaic inverter device also includes: a power module 160.

[0057] The input end of the power module 160 is connected to the output end of each photovoltaic panel 100; the first output end of the power module 160 is connected to the power end of the main control module 110; the second output end of the power module 160 is connected to the power end of the slave control module 140; the power module 160 is used to provide the required electrical energy to the main control module 130 and the slave control module 140.

[0058] Specifically, the power module 160 converts the electric energy output by each photovoltaic panel 100 into the electric energy required by the master control module 130 and the slave control module 140, and supplies the converted electric energy to the master control module 130 and the slave control module 140 respectively to maintain the operation of the master control module 130 and the slave control module 140. The power module 160 of the embodiment of the utility model uses the output electric energy of the photovoltaic panel 100 to power the master control module 130 and the slave control module 140, which is conducive to improving the energy utilization rate of the micro photovoltaic inverter device.

[0059] Based on the above embodiments, optionally, continue to refer to Figure 4 The power supply module 160 includes: an anti-reverse unit 161 and an auxiliary power supply unit 162.

[0060] The input end of the anti-reverse unit 161 is connected to the positive end of each photovoltaic panel 100; the output end of the anti-reverse unit 161 is connected to the positive input end of the auxiliary power supply unit 162; the negative input end of the auxiliary power supply unit 162 is connected to the negative end of each photovoltaic panel 100; the first output end of the auxiliary power supply unit 162 is connected to the power end of the main control module 130; the second output end of the auxiliary power supply unit 162 is connected to the power end of the slave control module 140; the anti-reverse unit 161 is used to prevent reverse current; the auxiliary power supply unit 162 is used to provide the required electrical energy to the main control module 130 and the slave control module 140.

[0061] Specifically, the anti-reverse unit 161 is connected between the auxiliary power unit 162 and the photovoltaic panel 100. The anti-reverse unit 161 limits the flow of current between the photovoltaic panel 100 and the auxiliary power unit 162 to prevent the current from flowing back and damaging the photovoltaic panel. The auxiliary power unit 162 is used to convert the electric energy output by the photovoltaic panel 100 into the electric energy required by the main control module 130 and the slave control module 140 to maintain the operation of the main control module 130 and the slave control module 140. For example, continue to refer to Figure 4 The anti-reverse unit 161 includes a plurality of anti-reverse diodes. The anti-reverse diodes are connected to the photovoltaic panels 100 one by one; the anode end of the anti-reverse diode is connected to the positive end of the photovoltaic panel 100; and the cathode end of the anti-reverse diode is connected to the positive end of the auxiliary power supply unit 162.

[0062] The embodiment of the utility model also provides an inverter system. Figure 5 Schematic diagram of an inverter system provided by an embodiment of the utility model. Figure 5 The inverter system 10 includes the micro photovoltaic inverter device 20 provided in any of the above embodiments. The inverter system 10 provided in the embodiment of the utility model has the beneficial effects of the micro photovoltaic inverter device 20 provided in any of the above embodiments, which will not be described in detail here.

[0063] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0064] The above specific implementations do not constitute a limitation on the protection scope of the present utility model. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A micro photovoltaic inverter device, characterized in that: include: At least two parallel MPPT modules, the input end of each MPPT module is connected to a photovoltaic panel; the MPPT module is used to track the maximum power of the photovoltaic panel and to increase the output voltage of the photovoltaic panel; A phase-changing module, wherein the phase-changing module has a plurality of switch tubes; the output end of each of the MPPT modules is connected to the input end of the phase-changing module; the output end of the phase-changing module is connected to the power grid; the phase-changing module is used to invert the electric energy output by the MPPT module; the phase-changing module has at least two control ends; A main control module, wherein the first driving end of the main control module is connected to at least one control end of the MPPT module; the first sampling end of the main control module is connected to the input end of the MPPT module connected to the first driving end of the main control module; the second sampling end of the main control module is connected to the power grid; the second driving end of the main control module is connected to the first control end of the phase-changing module; At least one slave control module, the first driving end of the slave control module is connected to at least one control end of the MPPT module; the first sampling end of the slave control module is connected to the input end of the MPPT module connected to the first driving end of the slave control module; the second sampling end of the slave control module is connected to the power grid; the second driving end of the slave control module is connected to the second control end of the phase-changing module; the communication end of the master control module is connected to the communication end of the slave control module; The master control module and the slave control module are used to collect input parameters of the MPPT module connected thereto; the master control module is also used to summarize the input parameters of the MPPT module and generate a first drive signal and a second drive signal; the master control module controls part of the switch tubes in the phase-changing module according to the first drive signal; the slave control module controls the remaining switch tubes in the phase-changing module according to the second drive signal.

2. The micro photovoltaic inverter device according to claim 1, characterized in that: The number of control terminals of the phase-changing module is the same as the sum of the number of the master control modules and the number of the slave control modules.

3. The micro photovoltaic inverter device according to claim 2, characterized in that: The phase-changing module comprises: an inverter; The input end of the inverter is connected to the output end of each MPPT module; the output end of the inverter is connected to the power grid; one control end of the inverter is connected to the master control module; and the remaining control ends of the inverter are connected to each slave control module one by one.

4. The micro photovoltaic inverter device according to claim 1, characterized in that: The MPPT module includes: a first flyback conversion circuit, a second flyback conversion circuit and a filter circuit; The first flyback conversion circuit and the second flyback conversion circuit are connected in parallel; the input end of the filter circuit is connected to the output end of the photovoltaic panel; the output end of the filter circuit is connected to the input end of the first flyback conversion circuit; The filter circuit is used to filter the direct current at the output end of the photovoltaic panel; the first flyback conversion circuit and the second flyback conversion circuit are used to boost the filtered direct current.

5. The micro photovoltaic inverter device according to claim 1, characterized in that: The number of the MPPT modules is the same as the number of the photovoltaic panels; the input end of each MPPT module is connected to the output end of each photovoltaic panel in a one-to-one correspondence.

6. The micro photovoltaic inverter device according to claim 1, characterized in that: Also includes: Low pass filter module; The low-pass filter module is arranged between the output end of the phase-changing module and the power grid; The low-pass filter module is used to filter the alternating current output by the phase-changing module.

7. The micro photovoltaic inverter device according to claim 1, characterized in that: Also includes: Power module; The input end of the power module is connected to the output end of each photovoltaic panel; the first output end of the power module is connected to the power end of the master control module; the second output end of the power module is connected to the power end of the slave control module; The power supply module is used to provide the required electric energy to the master control module and the slave control module.

8. The micro photovoltaic inverter device according to claim 7, characterized in that: The power supply module comprises: an anti-reverse unit and an auxiliary power supply unit; The input end of the anti-reverse unit is connected to the positive end of each photovoltaic panel; the output end of the anti-reverse unit is connected to the positive input end of the auxiliary power supply unit; the negative input end of the auxiliary power supply unit is connected to the negative end of each photovoltaic panel; the first output end of the auxiliary power supply unit is connected to the power supply end of the main control module; the second output end of the auxiliary power supply unit is connected to the power supply end of the slave control module; The anti-reverse unit is used to prevent reverse current; the auxiliary power supply unit is used to provide the required electric energy for the main control module and the slave control module.

9. The micro photovoltaic inverter device according to claim 8, characterized in that: The anti-reverse unit includes a plurality of anti-reverse diodes; The anti-reverse diode is connected to the photovoltaic panel in a one-to-one correspondence; the anode end of the anti-reverse diode is connected to the positive end of the photovoltaic panel; the cathode end of the anti-reverse diode is connected to the positive end of the auxiliary power supply unit.

10. An inverter system, characterized in that: It comprises a micro photovoltaic inverter device as described in any one of claims 1 to 9.

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