Control circuit of multi-path hybrid inverter and control method of multi-path hybrid inverter

Abstract

The invention discloses a control circuit of a multi-path hybrid inverter and a control method of the multi-path hybrid inverter, the control circuit comprises a polarity conversion switch module, the polarity conversion switch module comprises a first port, a second port, a third port and a fourth port, and a photovoltaic power conversion module comprises a first connecting end, a second connecting end and a third connecting end. The first connecting ends of the plurality of photovoltaic power conversion modules are electrically connected with different photovoltaic assemblies, the second connecting ends and the third connecting ends of the plurality of photovoltaic power conversion modules are electrically connected with the third port and the fourth port respectively, the battery power conversion module is electrically connected between the storage battery and the polarity conversion switch module, and the first sampling end of the main control module obtains a first electrical parameter; the second sampling end obtains a second electrical parameter; the third sampling end obtains a third electrical parameter, and the main control module controls the working states of the polarity conversion switch module, the photovoltaic power conversion module and the battery power conversion module based on the first electrical parameter, the second electrical parameter and the third electrical parameter.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic energy storage, and in particular to a control circuit of a multi-channel hybrid inverter and a control method of the multi-channel hybrid inverter. Background Art

[0002] As the core equipment in photovoltaic power generation systems, microinverters are responsible for efficiently converting the direct current (DC) generated by photovoltaic modules into alternating current (AC) that meets grid requirements. Their performance directly impacts the efficiency and stability of the entire photovoltaic system. With the advancement of energy storage technology and increasing user demands for power supply reliability, the market demand is growing for integrated solutions that can simultaneously achieve grid-connected power generation, energy storage charging and discharging, and off-grid power supply.

[0003] Conventional microinverters typically use a single-stage flyback topology. This structure offers advantages such as simple circuitry and low cost, but its unidirectional power transmission cannot meet the bidirectional charging and discharging requirements of energy storage batteries. To achieve bidirectional power transmission, microinverters with a two-stage topology have emerged on the market. The front-stage DC / DC converter is used for maximum power point tracking (MPPT), while the back-stage DC / AC converter provides the inverter output.

[0004] However, the micro-inverters in existing technologies have significant technical defects: they lack the ability to independently detect and comprehensively analyze the electrical parameters on the battery side, photovoltaic side, and grid side. Therefore, they cannot dynamically adjust the grid-connected output power according to the real-time electrical status of each side, resulting in unreasonable power distribution of the system under complex working conditions, affecting the overall power generation efficiency and power supply stability. Summary of the Invention

[0005] The main purpose of the present invention is to propose a control circuit for a multi-channel hybrid inverter, aiming to solve the problem that the micro-inverter in the prior art cannot dynamically adjust the grid-connected output power according to the real-time electrical status of each side.

[0006] To achieve the above objectives, the present invention proposes a control circuit for a multi-way hybrid inverter, which is applied to a photovoltaic energy storage system. The photovoltaic energy storage system includes a battery and multiple photovoltaic modules. The control circuit of the multi-way hybrid inverter includes: A polarity conversion switch module, the polarity conversion switch module comprising a first port, a second port, a third port and a fourth port, the first port and the second port being used to electrically connect a power grid and a load; A photovoltaic power conversion module, the photovoltaic power conversion module comprising a first connection end, a second connection end, and a third connection end, wherein the first connection end of a plurality of the photovoltaic power conversion modules is electrically connected to different photovoltaic assemblies, and the second connection end and the third connection end are electrically connected to the third port and the fourth port, respectively; a battery power conversion module, the battery power conversion module being electrically connected between the battery and the polarity conversion switch module; A main control module, the main control module includes a first sampling end, a second sampling end and a third sampling end, the first sampling end is electrically connected between the photovoltaic power conversion module and the photovoltaic component to obtain a first electrical parameter; the second sampling end is electrically connected between the battery and the battery power conversion module to obtain a second electrical parameter; the third sampling end is electrically connected to the first port and the second port to obtain a third electrical parameter, and the main control module controls the working states of the polarity conversion switch module, the photovoltaic power conversion module and the battery power conversion module based on the first electrical parameter, the second electrical parameter and the third electrical parameter.

[0007] In some embodiments, the main control module includes: a drive control module, the drive control module being electrically connected to the polarity conversion switch module, the polarity conversion switch module and the battery power conversion module respectively; A sampling module includes a first receiving end, a second receiving end, a third receiving end and a feedback end, wherein the first receiving end is electrically connected to the first sampling end, the second receiving end is electrically connected to the second sampling end, the third receiving end is electrically connected to the third sampling end, and the feedback end is electrically connected to the drive control module.

[0008] In some embodiments, the main control module includes: The drive control module includes a control module and a drive module. The control module is electrically connected to the drive module. The control module includes a digital signal processor. The digital signal processor is electrically connected to the first receiving end, the second receiving end and the third receiving end respectively, and is used to receive and process the first electrical parameter, the second electrical parameter and the third electrical parameter, and control the drive module to drive the polarity conversion switch module, the photovoltaic power conversion module and the battery power conversion module to operate based on the processing results.

[0009] In some embodiments, the photovoltaic power conversion module is a unidirectional flyback conversion module, and the battery power conversion module is a bidirectional flyback conversion module.

[0010] In some embodiments, the photovoltaic power conversion module includes a first transformer and a first switching tube, the first connection end includes a first positive connection end and a first negative connection end; the first transformer includes a first primary end, a second primary end, a first secondary end and a second secondary end, the first primary end is electrically connected to the first positive connection end, the second primary end is electrically connected to the first negative connection end via the first switching tube, the first secondary end is electrically connected to the second connection end, and the second secondary end is electrically connected to the third connection end.

[0011] In some embodiments, the photovoltaic power conversion module further includes a unidirectional conductive member, and the first secondary end is electrically connected to the third port via the unidirectional conductive member.

[0012] In some embodiments, the battery power conversion module includes a second transformer, a third transformer, a second switching tube, a third switching tube, a fourth switching tube, and a fifth switching tube. The first transformer includes a third primary end, a fourth primary end, a third secondary end, and a fourth secondary end. The third primary end is electrically connected to the positive electrode of the battery, and the fourth primary end is electrically connected to the negative electrode of the battery through the second switching tube. The third secondary end is electrically connected to the third port, and the fourth primary end is electrically connected to the fourth port through the third switching tube. The second transformer includes a fifth primary end, a sixth primary end, a fifth secondary end and a sixth secondary end, the fifth primary end is electrically connected to the positive pole of the battery, the sixth primary end is electrically connected to the negative pole of the battery through a fourth switching tube; the third secondary end is electrically connected to the third port, and the fourth primary end is electrically connected to the fourth port through the fifth switching tube.

[0013] The present invention further provides a control method for a multi-channel hybrid inverter. The control method for the multi-channel hybrid inverter is applied to the control circuit of the multi-channel hybrid inverter of the aforementioned embodiment. The control method for the multi-channel hybrid inverter includes: Obtain electrical parameters of photovoltaic modules, batteries and power grid; Calculate the preset input and output power based on the electrical parameters of the power grid; The switching duty ratio and switching period of the photovoltaic power conversion module are calculated based on the preset input and output power, and the switching duty ratio and switching period of the battery power conversion module are calculated.

[0014] In some embodiments, calculating the switching duty cycle and switching period of the photovoltaic power conversion module based on the preset input and output power includes: In the photovoltaic module power generation link, the calculation formula for the switching duty cycle of the photovoltaic power conversion module is: ; in, is the switching duty cycle of the photovoltaic power conversion module in the photovoltaic power generation link, is the real-time voltage on the grid side, The real-time voltage at the input end of the photovoltaic module; The calculation formula for the switching period of the photovoltaic power conversion module is: ; in, is the switching cycle of the photovoltaic power conversion module in the photovoltaic power generation link, is the primary inductance of the transformer, is the transformer primary magnetizing inductance, is the primary inductance of the transformer when the leakage inductance is equivalent to 0, is the average output power on the grid side, is the instantaneous output power on the grid side.

[0015] In some embodiments, calculating the switching duty cycle and switching period of the battery power conversion module includes: In the battery charging phase, the calculation formula for the switching duty cycle of the battery power conversion module is: ; in, It is the switching duty cycle of the battery power conversion module in the battery charging link. is the real-time voltage on the grid side, is the real-time voltage on the battery side; The calculation formula for the switching period of the battery power conversion module is: ; in, It is the switching cycle of the battery power conversion module in the battery charging process. is the transformer primary magnetizing inductance, is the average input power on the grid side.

[0016] In some embodiments, calculating the switching duty cycle and switching period of the battery power conversion module includes: The calculation formula for the switching duty cycle of the flyback converter in the battery discharge link is: ; in, is the switching duty cycle of the battery power conversion module in the battery discharge phase, is the real-time voltage on the grid side, is the real-time voltage on the battery side; The calculation formula for the switching period of the battery power conversion module is: ; in, is the switching cycle of the battery power conversion module in the battery discharge phase, is the primary inductance of the transformer, is the transformer primary magnetizing inductance, is the primary inductance of the transformer when the leakage inductance is equivalent to 0, is the average output power on the grid side, is the instantaneous output power on the grid side.

[0017] The beneficial effects of the technical solution of the present invention are: by setting a first sampling end between the photovoltaic power conversion module and the photovoltaic component to obtain a first electrical parameter, setting a second sampling end between the battery and the battery power conversion module to obtain a second electrical parameter, and setting a third sampling end at the first port and the second port of the polarity conversion switch module to obtain a third electrical parameter, real-time collection of electrical parameters on the photovoltaic component side, the battery side, and the grid side is achieved; the main control module performs comprehensive analysis and judgment based on the three sets of electrical parameters obtained to grasp the real-time operating status of each side. At the same time, according to the changes in the electrical parameters of each side under different working conditions, the coordinated work of the polarity conversion switch module, the photovoltaic power conversion module, and the battery power conversion module is controlled to achieve reasonable distribution and dynamic adjustment of power between photovoltaic power generation, battery energy storage, and grid output, thereby improving the overall power generation efficiency and power supply stability of the system under various complex working conditions, and meeting the needs of flexible and efficient operation of multi-channel hybrid photovoltaic energy storage systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of module electrical connections of an embodiment of a control circuit for a multi-channel hybrid inverter according to the present invention; Figure 2 A circuit diagram of an embodiment of a control circuit for a multi-channel hybrid inverter according to the present invention; Figure 3 This is a flow chart of an embodiment of a control method for a multi-channel hybrid inverter according to the present invention.

[0019] Description of Figure Numbers: 100, polarity conversion switch module; A1, first port; A2, second port; A3, third port; A4, fourth port; 200, photovoltaic power conversion module; 201, first connection terminal; 201a, first positive connection terminal; 201b, first negative connection terminal; 202, second connection terminal; 203, third connection terminal; T1, first transformer; E1, first primary terminal; E2, second primary terminal; F1, first secondary terminal; F2, second secondary terminal; Q1, first switching tube; D1, unidirectional conductive element; 300. Battery power conversion module; T2, second transformer; E3, third primary terminal; E4, fourth primary terminal; F3, third secondary terminal; F4, fourth secondary terminal; T3, third transformer; E5, fifth primary terminal; E6, sixth primary terminal; F5, fifth secondary terminal; F6, sixth secondary terminal; Q2, second switch; Q3, third switch; Q4, fourth switch; Q5, fifth switch; 400, main control module; P1, first sampling terminal; P2, second sampling terminal; P3, third sampling terminal; 410, drive control module; 411 control module; 412, drive module; 420, sampling module; J1, first receiving end; J2, second receiving end; J3, third receiving end.

[0020] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0021] The following will be combined with the accompanying drawings to clearly and completely describe the solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0022] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0023] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element.

[0024] In addition, the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0025] Reference Figure 1 and Figure 2 An embodiment of the present invention provides a control circuit for a multi-channel hybrid inverter, which is applied to a photovoltaic energy storage system. The photovoltaic energy storage system includes a battery and multiple photovoltaic modules. The control circuit of the multi-channel hybrid inverter includes: The polarity conversion switch module 100 includes a first port A1, a second port A2, a third port A3, and a fourth port A4. The first port A1 and the second port A2 are used to electrically connect the power grid and the load. Photovoltaic power conversion module 200, photovoltaic power conversion module 200 includes a first connection terminal 201, a second connection terminal 202 and a third connection terminal 203, wherein the first connection terminal 201 of the plurality of photovoltaic power conversion modules 200 is electrically connected to different photovoltaic modules, and the second connection terminal 202 and the third connection terminal 203 are electrically connected to the third port A3 and the fourth port A4, respectively; The battery power conversion module 300 is electrically connected between the battery and the polarity conversion switch module 100; The main control module 400 includes a first sampling terminal P1, a second sampling terminal P2 and a third sampling terminal P3. The first sampling terminal P1 is electrically connected between the photovoltaic power conversion module 200 and the photovoltaic component to obtain a first electrical parameter; the second sampling terminal P2 is electrically connected between the battery and the battery power conversion module 300 to obtain a second electrical parameter; the third sampling terminal P3 is electrically connected to the first port A1 and the second port A2 to obtain a third electrical parameter. The main control module 400 controls the working status of the polarity conversion switch module 100, the photovoltaic power conversion module 200 and the battery power conversion module 300 based on the first electrical parameter, the second electrical parameter and the third electrical parameter.

[0026] The main function of this embodiment is to achieve bidirectional conversion and polarity control of AC / DC power. The polarity conversion switch module 100 can be implemented using topologies such as an H-bridge inverter circuit, a full-bridge rectifier circuit, or a bidirectional AC / DC converter. Specifically, when the system is in grid-connected mode, the DC power from the photovoltaic module and the battery is received through the third port A3 and the fourth port A4. After inversion, the DC power is output through the first port A1 and the second port A2 and then connected to the grid. When the system is in off-grid mode, the first port A1 and the second port A2 can provide a stable AC power supply to the local load. In charging mode, the AC power from the grid received by the first port A1 and the second port A2 can also be rectified into DC power, and the battery can be charged through the third port A3 and the fourth port A4.

[0027] In this embodiment, each photovoltaic power conversion module 200 is electrically connected to a different photovoltaic module via its first connection terminal 201, implementing distributed maximum power point tracking (MPPT) control using a flyback topology. The second connection terminals 202 and third connection terminals 203 of multiple photovoltaic power conversion modules 200 are connected in parallel to the third port A3 and fourth port A4 of the polarity conversion switch module 100, respectively, to achieve power aggregation and unified output of multiple photovoltaic power generation channels.

[0028] In this embodiment, the battery power conversion module 300 is primarily responsible for managing the battery's charge and discharge power and matching voltage levels. Electrically connected between the battery and the polarity conversion switch module 100, the battery power conversion module 300 employs a flyback topology. This boosts the battery's DC power and feeds it into the polarity conversion switch module 100 for inversion output. It also receives DC power from photovoltaic panels or the grid for controlled charging of the battery. It also incorporates safety features such as overcharge and over-discharge protection.

[0029] The main control module 400, serving as the intelligent control core of the entire system, implements comprehensive electrical parameter monitoring through three sampling terminals. The first sampling terminal P1 is electrically connected between the photovoltaic power conversion module 200 and the photovoltaic module, acquiring first electrical parameters such as the module's output voltage, output current, and power in real time. The second sampling terminal P2 is electrically connected between the battery and the battery power conversion module 300, continuously monitoring second electrical parameters such as the battery's terminal voltage, charge / discharge current, and state of charge (SOC). The third sampling terminal P3 is electrically connected between the first port A1 and the second port A2, acquiring third electrical parameters such as the grid-side AC voltage, AC current, frequency, and power factor, as well as the voltage and current of the off-grid load. Based on these three sets of collected electrical parameters, the main control module 400 performs real-time analysis and intelligent decision-making, dynamically controlling the coordinated operating state of the polarity conversion switch module 100, the photovoltaic power conversion module 200, and the battery power conversion module 300. It should be noted that when there are multiple photovoltaic assemblies and multiple photovoltaic power conversion modules 200 , there are also multiple corresponding first acquisition terminals. That is, different first acquisition terminals collect electrical parameters of different photovoltaic assemblies.

[0030] The system's operation primarily involves three core components: photovoltaic power generation, energy storage management, and grid-connected control. During daytime hours with ample sunlight, photovoltaic panels generate direct current (DC). Each photovoltaic power conversion module 200 performs MPPT control on its connected PV panels, maximizing the PV power before channeling it to the polarity conversion switch module 100. The main control module 400 monitors the power generation status of each PV panel in real time via the first sampling terminal P1, dynamically adjusting power conversion parameters based on light intensity and temperature fluctuations. When PV power exceeds load demand, the excess energy is charged and stored in the battery via the battery power conversion module 300, while also being fed to the grid. When PV power is insufficient or when there is no sunlight at night, the battery discharges via the battery power conversion module 300, either cooperating with PV power generation to meet load demand or providing power independently. The main control module 400 monitors battery status and grid parameters via the second sampling terminal P2 and the third sampling terminal P3, respectively, enabling intelligent switching and power balancing between PV power generation, battery energy storage, and grid supply. In grid-connected mode, the system strictly adheres to grid voltage and frequency requirements for synchronization and connection. In off-grid mode, the system independently provides stable power to local loads. Throughout this process, the main control module 400 dynamically adjusts the operating status of each power conversion module based on real-time feedback from three sets of electrical parameters, ensuring efficient and stable operation under different operating conditions.

[0031] The beneficial effects of the technical solution of the present invention are as follows: by setting a first sampling terminal P1 between the photovoltaic power conversion module 200 and the photovoltaic component to obtain the real-time electrical parameters of photovoltaic power generation, setting a second sampling terminal P2 between the battery and the battery power conversion module 300 to obtain the operating parameters of the energy storage system, and setting a third sampling terminal P3 at the first port A1 and the second port A2 of the polarity conversion switch module 100 to obtain the electrical parameters of the grid side and the load side, comprehensive real-time monitoring of the electrical states of the photovoltaic component side, the battery energy storage side, and the grid load side is achieved; the main control module 400 performs comprehensive analysis and intelligent judgment based on the three sets of key electrical parameters obtained, and accurately grasps the dynamic operating status of each side. and power demand changes, and can intelligently control the coordinated work of the polarity conversion switch module 100, the photovoltaic power conversion module 200, and the battery power conversion module 300 according to the real-time changes of the electrical parameters on each side in different time periods and different working conditions, so as to realize the reasonable distribution and dynamic optimization adjustment of the power flow between photovoltaic power generation, battery energy storage, and grid output, effectively improving the overall power generation efficiency, energy utilization rate, and power supply stability of the system under complex and changeable working conditions, meeting the technical requirements of flexible and efficient operation of multi-channel hybrid photovoltaic energy storage systems in various operating modes such as grid-connected power generation, off-grid power supply, energy storage charging and discharging, and providing reliable technical guarantee for the construction of intelligent distributed photovoltaic energy storage systems.

[0032] See Figure 1 and Figure 2In this embodiment, the main control module 400 includes: The drive control module 410 is electrically connected to the polarity conversion switch module 100, the polarity conversion switch module 100 and the battery power conversion module 300 respectively; The sampling module 420 includes a first receiving terminal J1, a second receiving terminal J2, a third receiving terminal J3 and a feedback terminal. The first receiving terminal J1 is electrically connected to the first sampling terminal P1, the second receiving terminal J2 is electrically connected to the second sampling terminal P2, the third receiving terminal J3 is electrically connected to the third sampling terminal P3, and the feedback terminal is electrically connected to the drive control module 410.

[0033] In this embodiment, the main control module 400 further includes two core sub-modules, namely a drive control module 410 and a sampling module 420 , to achieve precise control and parameter monitoring of the multi-channel hybrid inverter control circuit.

[0034] The drive control module 410, serving as the execution core of the main control module 400, is electrically connected to the polarity conversion switch module 100, the photovoltaic power conversion module 200, and the battery power conversion module 300. Its primary function is to generate corresponding drive signals based on a control algorithm to control the switching devices of each power conversion module. The drive control module 410 may incorporate a built-in digital signal processor (DSP) or microcontroller (MCU), which receives feedback from the sampling module 420. Using the built-in control algorithm, it performs real-time computations on the three sets of electrical parameters to calculate key control parameters such as the effective value of the AC voltage and current, the voltage phase angle, the DC voltage amplitude, and the DC current. Based on the system's expected input and output power requirements, the switching period and duty cycle parameters required by the photovoltaic power conversion module 200 and the battery power conversion module 300 are calculated, and corresponding PWM (pulse width modulation) drive signals are generated to accurately control the on-off timing of each switching device in the polarity conversion switch module 100, the photovoltaic power conversion module 200, and the battery power conversion module 300, thereby achieving smooth switching and efficient operation between different operating modes such as grid-connected power generation, off-grid power supply, or battery charging.

[0035] Sampling module 420, serving as the information acquisition front-end for main control module 400, includes four signal interfaces: a first receiving terminal J1, a second receiving terminal J2, a third receiving terminal J3, and a feedback terminal. First receiving terminal J1 is electrically connected to first sampling terminal P1 and is responsible for receiving a first electrical parameter signal from the photovoltaic power conversion module 200 and the photovoltaic module. Second receiving terminal J2 is electrically connected to second sampling terminal P2 and is responsible for receiving a second electrical parameter signal from the battery and battery power conversion module 300. Third receiving terminal J3 is electrically connected to third sampling terminal P3 and is responsible for receiving a third electrical parameter signal from first port A1 and second port A2 of polarity conversion switch module 100. Sampling module 420 incorporates a high-precision analog-to-digital converter (ADC), signal conditioning circuitry, and filtering circuitry. It converts collected analog voltage and current signals into digital signals and transmits the processed digitized electrical parameter information in real time to drive control module 410 via the feedback terminal. This provides an accurate and reliable data foundation for algorithmic operations and control decisions in drive control module 410, ensuring that the entire control system can quickly and accurately respond to real-time electrical state changes.

[0036] Continue reading Figure 2 In this embodiment, the drive control module 410 includes a control module and a drive module 412. The control module is electrically connected to the drive module 412. The control module includes a digital signal processor, which is electrically connected to the first receiving terminal J1, the second receiving terminal J2, and the third receiving terminal J3, respectively, and is used to receive and process the first electrical parameter, the second electrical parameter, and the third electrical parameter, and control the drive module 412 to drive the polarity conversion switch module 100, the photovoltaic power conversion module 200, and the battery power conversion module 300 to operate based on the processing results.

[0037] In this embodiment, the control module serves as the intelligent decision-making core of the drive control module 410, electrically connected to the drive module 412 and providing command control thereto. The core component of the control module is a digital signal processor (DSP), which boasts high-speed computing capabilities and a rich set of peripheral interfaces. This DSP is electrically connected to the first receiving terminal J1, the second receiving terminal J2, and the third receiving terminal J3, respectively, and is capable of simultaneously receiving three electrical parameter signals from the sampling module 420. The DSP incorporates dedicated signal processing algorithms and control strategies, enabling real-time digital processing and analysis of received first electrical parameters (such as photovoltaic module voltage, current, and power), second electrical parameters (such as battery voltage, current, and SOC), and third electrical parameters (such as grid voltage, current, frequency, and phase).

[0038] The digital signal processor uses a variety of built-in control strategies, including the MPPT algorithm, power balancing algorithm, and grid-connected synchronization algorithm, to perform comprehensive operations and logical judgments on the three sets of electrical parameters. It calculates the optimal control parameters for the current operating conditions, including key control variables such as the switching frequency, duty cycle, and phase angle of each power conversion module. Based on the processing results, the digital signal processor generates corresponding control command signals and transmits them to the driver module 412 via the digital communication interface, achieving precise control of the driver module 412.

[0039] Driver module 412, acting as the execution unit of driver control module 410, receives digital control instructions from the control module and converts them into drive signals suitable for power switching devices. Driver module 412 incorporates hardware components such as a PWM signal generator, a gate drive circuit, and an optoelectronic isolation circuit. Based on the control module's instructions, it generates PWM drive signals with specific frequencies, duty cycles, and phase relationships to drive power switching devices such as IGBTs and MOSFETs in polarity conversion switch module 100, photovoltaic power conversion module 200, and battery power conversion module 300, respectively. Driver module 412 also incorporates safety features such as overcurrent protection, overvoltage protection, and short-circuit protection to ensure timely termination of drive signals under abnormal operating conditions, protecting the power devices and the entire system.

[0040] Through the coordinated cooperation between the control module and the drive module 412, the main control module 400 realizes a complete control loop from electrical parameter acquisition, signal processing, control decision-making to drive execution, providing reliable technical guarantee for the efficient and stable operation of the multi-channel hybrid inverter under various complex working conditions.

[0041] In some embodiments, the photovoltaic power conversion module 200 is a unidirectional flyback conversion module, and the battery power conversion module 300 is a bidirectional flyback conversion module.

[0042] In this embodiment, the photovoltaic power conversion module 200 adopts the circuit structure of a unidirectional flyback conversion module, which is particularly well-suited to the unidirectional power transmission characteristics of photovoltaic power generation systems. The unidirectional flyback conversion module primarily consists of components such as a high-frequency transformer, a main switch, an output rectifier diode, and a filter capacitor. When the main switch is on, the DC power of the photovoltaic module is stored in the primary winding of the high-frequency transformer. When the main switch is off, the secondary winding of the transformer releases the magnetic energy, and after rectification and filtering, a stable DC voltage is output. This structure has the advantages of a simple circuit, low cost, and good electrical isolation. It can effectively achieve step-up conversion and power transmission of the photovoltaic module output voltage. At the same time, MPPT control is achieved by adjusting the duty cycle of the main switch, ensuring that the photovoltaic module always operates at its maximum power point.

[0043] The battery power conversion module 300 adopts the circuit structure of a bidirectional flyback conversion module, which can meet the bidirectional power flow requirements of battery charging and discharging. Based on the traditional flyback converter, the bidirectional flyback conversion module adds a synchronous rectifier switch tube to the secondary side of the transformer, replacing the unidirectional rectifier diode, so that power can be transmitted bidirectionally between the primary and secondary sides. In the battery discharge mode, electrical energy is transmitted from the battery side to the DC bus side; in the battery charging mode, electrical energy is transmitted from the DC bus side to the battery side. By controlling the on-off timing and duty cycle of the primary and secondary side switches, the battery's charge and discharge power and current direction can be precisely controlled, while achieving voltage matching and power regulation during the charge and discharge process, providing safe and reliable charge and discharge management for the battery.

[0044] See Figure 2 In this embodiment, the photovoltaic power conversion module 200 includes a first transformer T1 and a first switching tube Q1. The first connection terminal 201 includes a first positive connection terminal 201a and a first negative connection terminal 201b. The first transformer T1 includes a first primary terminal E1, a second primary terminal E2, a first secondary terminal F1, and a second secondary terminal F2. The first primary terminal E1 is electrically connected to the first positive connection terminal 201a, the second primary terminal E2 is electrically connected to the first negative connection terminal 201b via the first switching tube Q1, the first secondary terminal F1 is electrically connected to the second connection terminal 202, and the second secondary terminal F2 is electrically connected to the third connection terminal 203.

[0045] In this embodiment, the photovoltaic power conversion module 200 comprises two core components: a first transformer T1 and a first switching transistor Q1. The first connection terminal 201, serving as the access port for the photovoltaic module, includes a first positive connection terminal 201a and a first negative connection terminal 201b, corresponding to the positive and negative output terminals of the photovoltaic module, respectively. The first transformer T1, a key component for energy storage and transmission, comprises four terminals: a first primary terminal E1, a second primary terminal E2, a first secondary terminal F1, and a second secondary terminal F2. The first primary terminal E1 is directly electrically connected to the first positive connection terminal 201a, while the second primary terminal E2 is electrically connected to the first negative connection terminal 201b via the first switching transistor Q1, forming a primary-side current loop. The first secondary terminal F1 is electrically connected to the second connection terminal 202, and the second secondary terminal F2 is electrically connected to the third connection terminal 203, forming the power output channel for the secondary-side polarity conversion switch module 100.

[0046] The photovoltaic power generation process is divided into two complementary phases. During the photovoltaic power generation phase, the main control module 400 controls the on / off state of the first switch Q1 based on the switching cycle and duty cycle parameters calculated in real time, while simultaneously coordinating the control of the operating state of the polarity conversion switch module 100 to transmit photovoltaic power. Specifically, when the first switch Q1 is in the on state, the DC power generated by the photovoltaic module forms a complete current loop from the first positive connection terminal 201a → the first primary terminal E1 → the primary winding of the first transformer T1 → the second primary terminal E2 → the first switch Q1 → the first negative connection terminal 201b. At this time, the electrical energy is stored in the excitation inductance of the first transformer T1 in the form of magnetic energy, and the primary-side current increases linearly. Subsequently, the main control module 400 controls the first switch tube Q1 to turn off, and the magnetic energy stored in the excitation inductor is transferred to the secondary side through electromagnetic coupling, and output to the polarity conversion switch module 100 through the first secondary terminal F1 and the second secondary terminal F2. The polarity conversion switch module 100 converts the DC power into AC power that meets the grid standards to achieve grid-connected power generation or provide power for local loads.

[0047] It should be noted that in a system including multiple photovoltaic power conversion modules 200, each photovoltaic power conversion module 200 adopts the same working principle and control method. Each module independently performs MPPT control and power conversion on the connected photovoltaic components to achieve distributed photovoltaic power generation management. The output ends of all modules (the second connection end 202 and the third connection end 203) are connected in parallel and then uniformly connected to the polarity conversion switch module 100, thereby achieving efficient integration and output of multiple photovoltaic power generation powers.

[0048] See Figure 2 The photovoltaic power conversion module 200 further includes a unidirectional conductive element D1 , and the first secondary terminal F1 is electrically connected to the third port A3 via the unidirectional conductive element D1 .

[0049] In this embodiment, the photovoltaic power conversion module 200 further includes a unidirectional conductive element D1, which is connected in series in the circuit between the first secondary terminal F1 and the third port A3. That is, the first secondary terminal F1 is electrically connected to the third port A3 via the unidirectional conductive element D1, forming a unidirectional current channel.

[0050] The unidirectional conductive element D1 can be a Schottky diode, a fast recovery diode, or other unidirectional conductive device. Its primary function is to prevent reverse current flow. In normal photovoltaic power generation mode, the unidirectional conductive element D1 allows current from the secondary side of the first transformer T1 to pass smoothly, transmitting the power generated by the photovoltaic module to the polarity conversion switch module 100.

[0051] The key function of this design is to prevent current backflow. When the system is in the grid-charging battery mode, without the protection of the unidirectional conductive element D1, current from the grid or battery side may flow back into the photovoltaic module through the polarity conversion switch module 100 and the secondary winding of the first transformer T1. This reverse current will not only cause unnecessary losses and heat to the first transformer T1, but more importantly, it may damage the internal structure of the photovoltaic module, affecting its power generation performance and service life. By providing the unidirectional conductive element D1, the reverse current path is effectively blocked, ensuring that the photovoltaic power conversion module 200 operates only in a unidirectional power output mode, protecting the safe operation of the photovoltaic module and the first transformer T1.

[0052] See Figure 2 In this embodiment, the battery power conversion module 300 includes a second transformer T2, a third transformer T3, a second switching transistor Q2, a third switching transistor Q3, a fourth switching transistor Q4, and a fifth switching transistor Q5. The first transformer T1 includes a third primary end E3, a fourth primary end E4, a third secondary end F3, and a fourth secondary end F4. The third primary end E3 is electrically connected to the positive electrode of the battery, and the fourth primary end E4 is electrically connected to the negative electrode of the battery through the second switching transistor Q2. The third secondary end F3 is electrically connected to the third port A3, and the fourth primary end E4 is electrically connected to the fourth port A4 through the third switching transistor. The second transformer T2 includes a fifth primary terminal E5, a sixth primary terminal E6, a fifth secondary terminal F5 and a sixth secondary terminal F6. The fifth primary terminal E5 is electrically connected to the positive electrode of the battery, and the sixth primary terminal E6 is electrically connected to the negative electrode of the battery through the fourth switch tube Q4; the third secondary terminal F3 is electrically connected to the third port A3, and the fourth primary terminal E4 is electrically connected to the fourth port A4 through the fifth switch tube Q5.

[0053] In this embodiment, the battery power conversion module 300 employs a bidirectional flyback converter structure with two transformers connected in parallel to achieve efficient battery charging and discharging. The module includes a second transformer T2, a third transformer T3, and four switches (a second switch Q2, a third switch Q3, a fourth switch Q4, and a fifth switch Q5).

[0054] The second transformer T2 includes a third primary terminal E3, a fourth primary terminal E4, a third secondary terminal F3, and a fourth secondary terminal F4. The third primary terminal E3 is directly electrically connected to the positive terminal of the battery, while the fourth primary terminal E4 is electrically connected to the negative terminal of the battery via the second switching transistor Q2, forming a primary-side circuit. The third secondary terminal F3 is electrically connected to the third port A3, while the fourth secondary terminal F4 is electrically connected to the fourth port A4 via the third switching transistor, forming a secondary-side output channel. The third transformer T3 includes a fifth primary terminal E5, a sixth primary terminal E6, a fifth secondary terminal F5, and a sixth secondary terminal F6. The fifth primary terminal E5 is electrically connected to the positive terminal of the battery, while the sixth primary terminal E6 is electrically connected to the negative terminal of the battery via the fourth switching transistor Q4. The fifth secondary terminal F5 is electrically connected to the third port A3, while the sixth secondary terminal F6 is electrically connected to the fourth port A4 via the fifth switching transistor Q5. The secondary sides of the two transformers are connected in parallel to achieve combined power output.

[0055] The battery discharge process is divided into two alternating time periods. During the first time period, the main control module 400 controls the second and fourth switches Q2 and Q4 to be simultaneously turned on based on the calculated switching cycle and duty cycle parameters. At this time, the third and fifth switches Q5 are turned off. The DC power from the battery forms a current loop through the primary windings of the two transformers, where it is stored as magnetic energy in the magnetizing inductors of the second and third transformers T2 and T3. During the second time period, the main control module 400 controls the second and fourth switches Q2 and Q4 to be turned off, while simultaneously controlling the third and fifth switches Q5 to be turned on. The magnetic energy stored in the magnetizing inductors of the two transformers is transferred to the secondary side through electromagnetic coupling. The magnetic energy is then output in parallel via the third and fourth secondary terminals F3, F4, F5, and F6, respectively, to the polarity conversion switch module 100. The polarity conversion switch module 100 converts the DC power into AC power for grid-connected power generation or load power supply.

[0056] The battery charging process is the reverse of the discharging process. The main control module 400 first controls the third and fifth switches Q5 to alternately conduct, allowing the DC power from the polarity conversion switch module 100 to store magnetic energy in the transformer secondary winding. During the second time period, the main control module 400 controls the third and fifth switches Q5 to be turned off, while simultaneously controlling the second and fourth switches Q2 and Q4 to conduct. The power stored in the excitation inductor is transmitted to the battery via the third and fifth primary terminals E3 and E5, achieving controlled charging of the battery. By operating the dual transformers in parallel and coordinating the control of the four switches, the battery power conversion module 300 can achieve high-power, high-efficiency bidirectional power conversion, meeting the battery's charging and discharging requirements under different operating conditions.

[0057] The present invention further provides a control method for a multi-channel hybrid inverter. The control method for the multi-channel hybrid inverter is applied to the control circuit of the multi-channel hybrid inverter in the aforementioned embodiment. The specific structure of the control circuit of the multi-channel hybrid inverter is similar to that in the aforementioned embodiment. The control method for the multi-channel hybrid inverter includes: Step S10: obtaining electrical parameters of the photovoltaic module, battery, and grid; Step S20 calculates the preset input and output power based on the electrical parameters of the power grid; In step S30 , the switching duty cycle and the switching period of the photovoltaic power conversion module 200 are calculated based on the preset input and output power, and the switching duty cycle and the switching period of the battery power conversion module 300 are calculated.

[0058] See Figure 3 In this embodiment, step S10 is the electrical parameter acquisition phase. The main control module 400, through its built-in sampling module 420, acquires real-time electrical parameters from three key components of the system. Specifically, the first sampling terminal P1 acquires the electrical parameters of the photovoltaic modules, such as the output voltage, output current, instantaneous power, and power generation efficiency of the photovoltaic array; the second sampling terminal P2 acquires the electrical parameters of the battery, including key information such as the battery pack's terminal voltage, charge and discharge current, remaining capacity (SOC), and internal resistance; and the third sampling terminal P3 acquires the electrical parameters of the power grid, including grid-side operating parameters such as the AC voltage amplitude, effective current value, frequency, phase angle, and load power demand. These electrical parameters provide a comprehensive and accurate data foundation for subsequent control decisions.

[0059] Step S20 is the preset power calculation stage. Based on the grid electrical parameters acquired in step S10, combined with the current grid state, load demand changes, and system operating mode, the main control module 400 calculates the system's preset input and output power under the current operating conditions using its built-in power management algorithm and optimization strategy. This preset power takes into account multiple factors, including grid voltage stability requirements, load power balancing requirements, grid-connected power limits, and system efficiency optimization, providing a unified power allocation target for the coordinated operation of each power conversion module.

[0060] Step S30 is the control parameter calculation stage. Using the preset input and output power determined in step S20 as the target, the main control module 400 comprehensively analyzes the real-time electrical status of the photovoltaic modules and batteries. Using a PWM control algorithm and feedback control strategy, it accurately calculates the required switching duty cycle and switching cycle parameters for each of the photovoltaic power conversion module 200 and the battery power conversion module 300. For the photovoltaic power conversion module 200, the control parameter calculation is primarily based on the MPPT algorithm and power transmission requirements; for the battery power conversion module 300, the control parameters need to consider charge and discharge mode switching, bidirectional power flow control, and battery protection requirements. These precisely calculated control parameters guide the drive control module 410 in generating the corresponding PWM drive signals, achieving precise control of each power conversion module.

[0061] In one embodiment, calculating the switching duty cycle and switching period of the photovoltaic power conversion module based on the preset input and output power includes: In the photovoltaic module power generation link, the calculation formula for the switching duty cycle of the photovoltaic power conversion module is: ; in, is the switching duty cycle of the photovoltaic power conversion module in the photovoltaic power generation link, is the real-time voltage on the grid side, The real-time voltage at the input end of the photovoltaic module; The calculation formula for the switching period of the photovoltaic power conversion module is: ; in, is the switching cycle of the photovoltaic power conversion module in the photovoltaic power generation link, is the primary inductance of the transformer, is the transformer primary magnetizing inductance, is the primary inductance of the transformer when the leakage inductance is equivalent to 0, is the average output power on the grid side, is the instantaneous output power on the grid side.

[0062] In this embodiment, the main control module uses the duty cycle calculation formula D=V g / (V g +V pv ), where D is the switching duty cycle of the photovoltaic power conversion module in the photovoltaic power generation link, V g is the grid side voltage value collected in real time through the third sampling terminal, V pv is the voltage value of the photovoltaic module input terminal collected in real time by the first sampling terminal. This formula ensures that the output voltage of the photovoltaic power conversion module can match the grid voltage, achieving efficient power transmission.

[0063] Switching cycle calculation: The main control module calculates the switching cycle parameters of the photovoltaic power conversion module based on the switching cycle calculation formula. Among them, TBCM is the switching cycle of the photovoltaic power generation link, L p is the primary inductance of the first transformer, Po(ωt) is the instantaneous output power on the grid side, D is the switch duty cycle calculated above, V pv It is the real-time voltage at the input end of the PV module.

[0064] By coordinating the application of the two core calculation formulas mentioned above, the main control module can dynamically adjust the operating parameters of the photovoltaic power conversion module according to the real-time power generation status of the photovoltaic panels and the changes in power demand on the grid side, ensuring that the photovoltaic power generation system can achieve optimal power output and efficient energy conversion under different lighting conditions and load conditions.

[0065] In some embodiments, calculating the switching duty cycle and switching period of the battery power conversion module includes: In the battery charging phase, the calculation formula for the switching duty cycle of the battery power conversion module is: ; in, It is the switching duty cycle of the battery power conversion module in the battery charging link. is the real-time voltage on the grid side, is the real-time voltage on the battery side; The calculation formula for the switching period of the battery power conversion module is: ; in, It is the switching cycle of the battery power conversion module in the battery charging process. is the transformer primary magnetizing inductance, is the average input power on the grid side.

[0066] In this embodiment, the main control module uses a dedicated mathematical calculation model to precisely control the switching parameters of the battery power conversion module based on the battery charging conditions. By calculating these control parameters for the charging mode, the main control module intelligently adjusts the operating parameters of the battery power conversion module according to the battery's real-time status and grid power conditions, achieving safe and efficient battery charging, extending battery life, and ensuring charging stability.

[0067] In some embodiments, calculating the switching duty cycle and switching period of the battery power conversion module includes: The calculation formula for the switching duty cycle of the flyback converter in the battery discharge link is: ; in, is the switching duty cycle of the battery power conversion module in the battery discharge phase, is the real-time voltage on the grid side, is the real-time voltage on the battery side; The calculation formula for the switching period of the battery power conversion module is: ; in, is the switching cycle of the battery power conversion module in the battery discharge phase, is the primary inductance of the transformer, is the transformer primary magnetizing inductance, is the primary inductance of the transformer when the leakage inductance is equivalent to 0, is the average output power on the grid side, is the instantaneous output power on the grid side.

[0068] In this embodiment, the main control module uses a dedicated control algorithm to control the discharge process of the battery power conversion module according to the battery discharge operating conditions. By calculating the control parameters dedicated to the above-mentioned discharge mode, the main control module can intelligently adjust the discharge parameters of the battery power conversion module according to the real-time voltage status, remaining power and grid load requirements of the battery, ensuring that the battery can provide stable and reliable power output during the discharge process, while avoiding damage to the battery caused by excessive discharge, thereby achieving safe and efficient operation of the battery energy storage system.

[0069] The above description is only a partial or preferred embodiment of the present invention. Neither the text nor the drawings can limit the scope of protection of the present invention. Any equivalent structural transformation made by using the contents of the present invention specification and drawings under the overall concept of the present invention, or direct / indirect application in other related technical fields, is included in the scope of protection of the present invention.

Claims

1. A control circuit of a multi-channel hybrid inverter, applied to a photovoltaic energy storage system, wherein the photovoltaic energy storage system includes a battery and a plurality of photovoltaic modules, characterized in that: The control circuit of the multi-channel hybrid inverter includes: A polarity conversion switch module, the polarity conversion switch module comprising a first port, a second port, a third port and a fourth port, the first port and the second port being used to electrically connect a power grid and a load; A photovoltaic power conversion module, the photovoltaic power conversion module comprising a first connection end, a second connection end, and a third connection end, wherein the first connection end of a plurality of the photovoltaic power conversion modules is electrically connected to different photovoltaic assemblies, and the second connection end and the third connection end are electrically connected to the third port and the fourth port, respectively; a battery power conversion module, the battery power conversion module being electrically connected between the battery and the polarity conversion switch module; A main control module, the main control module includes a first sampling end, a second sampling end and a third sampling end, the first sampling end is electrically connected between the photovoltaic power conversion module and the photovoltaic component to obtain a first electrical parameter; the second sampling end is electrically connected between the battery and the battery power conversion module to obtain a second electrical parameter; the third sampling end is electrically connected to the first port and the second port to obtain a third electrical parameter, and the main control module controls the working states of the polarity conversion switch module, the photovoltaic power conversion module and the battery power conversion module based on the first electrical parameter, the second electrical parameter and the third electrical parameter.

2. The control circuit of the multi-channel hybrid inverter according to claim 1, characterized in that: The main control module includes: a drive control module, the drive control module being electrically connected to the polarity conversion switch module, the polarity conversion switch module and the battery power conversion module respectively; A sampling module includes a first receiving end, a second receiving end, a third receiving end and a feedback end, wherein the first receiving end is electrically connected to the first sampling end, the second receiving end is electrically connected to the second sampling end, the third receiving end is electrically connected to the third sampling end, and the feedback end is electrically connected to the drive control module.

3. The control circuit of the multi-channel hybrid inverter according to claim 2, characterized in that: The drive control module includes a control module and a drive module. The control module is electrically connected to the drive module. The control module includes a digital signal processor. The digital signal processor is electrically connected to the first receiving end, the second receiving end and the third receiving end respectively, and is used to receive and process the first electrical parameter, the second electrical parameter and the third electrical parameter, and control the drive module to drive the polarity conversion switch module, the photovoltaic power conversion module and the battery power conversion module to operate based on the processing results.

4. The control circuit of the multi-channel hybrid inverter according to claim 1, characterized in that: The photovoltaic power conversion module is a unidirectional flyback conversion module, and the battery power conversion module is a bidirectional flyback conversion module.

5. The control circuit of the multi-channel hybrid inverter according to claim 1, characterized in that: The photovoltaic power conversion module includes a first transformer and a first switching tube, the first connection end includes a first positive connection end and a first negative connection end; the first transformer includes a first primary end, a second primary end, a first secondary end and a second secondary end, the first primary end is electrically connected to the first positive connection end, the second primary end is electrically connected to the first negative connection end via the first switching tube, the first secondary end is electrically connected to the second connection end, and the second secondary end is electrically connected to the third connection end.

6. The control circuit of the multi-channel hybrid inverter according to claim 5, characterized in that: The photovoltaic power conversion module further includes a unidirectional conductive member, and the first secondary end is electrically connected to the third port via the unidirectional conductive member.

7. The control circuit of the multi-channel hybrid inverter according to claim 1, characterized in that: The battery power conversion module includes a second transformer, a third transformer, a second switching tube, a third switching tube, a fourth switching tube, and a fifth switching tube. The second transformer includes a third primary end, a fourth primary end, a third secondary end, and a fourth secondary end. The third primary end is electrically connected to the positive electrode of the battery, and the fourth primary end is electrically connected to the negative electrode of the battery through the second switching tube. The third secondary end is electrically connected to the third port, and the fourth primary end is electrically connected to the fourth port through the third switching tube. The second transformer includes a fifth primary end, a sixth primary end, a fifth secondary end and a sixth secondary end, the fifth primary end is electrically connected to the positive pole of the battery, the sixth primary end is electrically connected to the negative pole of the battery through a fourth switching tube; the third secondary end is electrically connected to the third port, and the fourth primary end is electrically connected to the fourth port through the fifth switching tube.

8. A control method for a multi-channel hybrid inverter, characterized in that: The control method of the multi-channel hybrid inverter is applied to the control circuit of the multi-channel hybrid inverter according to any one of claims 1 to 7, and the control method of the multi-channel hybrid inverter includes: Obtain electrical parameters of photovoltaic modules, batteries and power grid; Calculate the preset input and output power based on the electrical parameters of the power grid; The switching duty ratio and switching period of the photovoltaic power conversion module are calculated based on the preset input and output power, and the switching duty ratio and switching period of the battery power conversion module are calculated.

9. The control method of a multi-channel hybrid inverter according to claim 8, characterized in that: The step of calculating the switching duty cycle and switching period of the photovoltaic power conversion module based on the preset input and output power includes: In the photovoltaic module power generation link, the calculation formula for the switching duty cycle of the photovoltaic power conversion module is: ； in, is the switching duty cycle of the photovoltaic power conversion module in the photovoltaic power generation link, is the real-time voltage on the grid side, The real-time voltage at the input end of the photovoltaic module; The calculation formula for the switching period of the photovoltaic power conversion module is: ； in, is the switching cycle of the photovoltaic power conversion module in the photovoltaic power generation link, is the primary inductance of the transformer, is the transformer primary magnetizing inductance, is the primary inductance of the transformer when the leakage inductance is equivalent to 0, is the average output power on the grid side, is the instantaneous output power on the grid side.

10. The control method of a multi-channel hybrid inverter according to claim 9, characterized in that: The calculating of the switching duty cycle and the switching period of the battery power conversion module includes: In the battery charging phase, the calculation formula for the switching duty cycle of the battery power conversion module is: ； in, It is the switching duty cycle of the battery power conversion module in the battery charging link. is the real-time voltage on the grid side, is the real-time voltage on the battery side; The calculation formula for the switching period of the battery power conversion module is: ； in, It is the switching cycle of the battery power conversion module in the battery charging process. is the transformer primary magnetizing inductance, is the average input power on the grid side.

11. The control method of a multi-channel hybrid inverter according to claim 9, characterized in that: The calculating of the switching duty cycle and the switching period of the battery power conversion module includes: The calculation formula for the switching duty cycle of the flyback converter in the battery discharge link is: ； in, is the switching duty cycle of the battery power conversion module in the battery discharge phase, is the real-time voltage on the grid side, is the real-time voltage on the battery side; The calculation formula for the switching period of the battery power conversion module is: ； in, is the switching cycle of the battery power conversion module in the battery discharge phase, is the primary inductance of the transformer, is the transformer primary magnetizing inductance, is the primary inductance of the transformer when the leakage inductance is equivalent to 0, is the average output power on the grid side, is the instantaneous output power on the grid side.

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