Integrated charging and discharging test system and method based on modular photovoltaic power generation device

Abstract

The present invention provides an integrated charging and discharging test system and method based on a modular photovoltaic power generation device, including: a main controller module executes a preset control logic and cooperates with a host computer to perform charging and discharging operations; a relay switch module is a main controller module that controls the relay switch module to realize the opening and closing of the charging and discharging circuit; a programmable DC power supply module is a main controller module that controls the programmable DC power supply module to realize the simulation of photovoltaic power generation characteristics as DC input during the charging operation; a power analysis and grid-connected test module is a main controller module that controls the power analysis and grid-connected test module to realize the simulation test of the inverter AC output power quality, various operating conditions and load characteristics of the power grid during the discharge operation; the main control machine has the monitoring, operation and display functions of an integrated platform. The present invention simulates the most realistic working conditions to perform reliable stability tests on the light storage and charging device.

Description

Technical Field

[0001] The present invention relates to the field of new energy, and in particular, to a light storage and charging test device, and more particularly, to an integrated charging and discharging test system and method based on a modular photovoltaic power generation device. Background Art

[0002] With the country's emphasis on industries or fields such as new energy, smart energy, and energy storage, these industries have achieved rapid development in recent years. Distributed power generation based on new energy such as photovoltaics and wind power has received more and more attention in the power industry. However, due to regional restrictions on wind power, it is less economical to use it in small areas in most non-northwest regions of China. Therefore, inland areas are mainly based on photovoltaic storage systems.

[0003] Most grid-connected photovoltaic storage and charging devices are usually composed of energy storage modules, photovoltaic charging modules, inverter output and mains charging modules. The overall functional interface covers mains charging interface, photovoltaic (DC) charging interface, DC output interface, inverter AC output interface, communication interface, etc. In order to ensure the stable and reliable operation of grid-connected photovoltaic storage and charging devices, it is necessary to verify the reliability of its overall charging and discharging functions and assess the stability of various indicators. However, the current testing methods for photovoltaic input and inverter output, grid-connected stability, etc. are too scattered and rough. The equipment is too scattered, which makes the overall reliability test operation complicated. At the same time, different types of test equipment are difficult to meet all reliability test requirements. Therefore, in the current environment, with the explosive development of the energy storage industry, an integrated reliability test system for photovoltaic storage and charging devices is one of the urgent needs.

[0004] Patent document CN105572502B (application number: 201510955542.9) discloses an integrated detection device for charging and discharging supercapacitors for energy storage, which relates to the field of battery detection. It meets the demand for an integrated detection device for charging and discharging supercapacitors for energy storage with a large measurement range, high measurement accuracy, good stability, fast speed and easy use. The charging detection and discharge detection of the supercapacitor for energy storage are realized through the charging circuit, constant current discharge circuit and constant voltage discharge circuit. The charging circuit charges the supercapacitor for energy storage through a DC reference source and a feedback adjustment process; at the same time, it can also monitor the amount of charging in real time, so as to facilitate timely adjustment of the charging circuit. The constant current discharge circuit and the constant voltage discharge circuit act as loads to discharge the supercapacitor for energy storage. Summary of the invention

[0005] In view of the defects in the prior art, the object of the present invention is to provide an integrated charging and discharging test system and method based on a modular photovoltaic power generation device.

[0006] The integrated charging and discharging test system based on the modular photovoltaic power generation device provided by the present invention comprises: a main controller module, a relay switch module, a programmable DC power supply module, a power analysis and grid-connected test module, an industrial computer and a grid-connected photovoltaic storage and charging power generation device;

[0007] The grid-connected optical storage and charging device is connected to the main controller module;

[0008] The relay switch module is connected to the main controller module;

[0009] The programmable DC power supply module is connected to the main controller module;

[0010] The mains power is connected to the main controller module;

[0011] The power analysis and grid connection test module is connected to the main controller module;

[0012] The industrial computer is connected to the main controller module.

[0013] The main controller module executes the preset control logic and cooperates with the host computer to perform charging and discharging operations;

[0014] The relay switch module is controlled by the main controller module to realize the opening and closing of the charging and discharging circuit;

[0015] The programmable DC power supply module is controlled by the main controller module to simulate the photovoltaic power generation characteristics as DC input during the charging operation;

[0016] The power analysis and grid-connected test module is controlled by the main controller module to simulate and test the inverter AC output power quality, various operating conditions of the power grid and load characteristics during the discharge operation;

[0017] The main control machine has the monitoring, operation and display functions of an integrated platform.

[0018] Preferably, the programmable DC power supply module is connected to the main controller module via a photovoltaic input interface.

[0019] Preferably, the mains power is connected to a mains power input interface, and the mains power input interface is connected to the main controller module.

[0020] Preferably, the industrial computer is connected to the main controller module via Ethernet.

[0021] Preferably, the main controller module is functionally expanded through a data conversion port; the functional expansion includes using a shunt, a voltmeter and / or an oscilloscope in conjunction with the data conversion port.

[0022] Preferably, the relay switch module includes a DC relay, an air switch, an AC contactor and / or a vacuum circuit breaker, and is operated in a small-to-large control mode.

[0023] Preferably, the programmable DC power supply module includes a photovoltaic characteristic DC input mode, a constant current floating charge mode and a constant voltage current reduction mode;

[0024] The photovoltaic characteristic DC input mode can set open circuit voltage parameters, short circuit current parameters, maximum power point voltage parameters and maximum power point current parameters.

[0025] Preferably, the power quality in the power analysis and grid-connected test module includes adjustable voltage, current, active power, reactive power, frequency, power factor, voltage / frequency regulation rate, voltage / frequency fluctuation rate, voltage waveform sinusoidal distortion rate and voltage setting range;

[0026] The various operating conditions of the power grid include: voltage deviation, frequency deviation, harmonics, voltage fluctuation and flicker and / or low voltage ride-through;

[0027] The load characteristics include an adjustable power factor.

[0028] Preferably, the main control machine includes monitoring, through a main control module, voltage, current, power, frequency, time, capacity, energy, temperature, power quality, grid simulation conditions and various load characteristics during the charging and discharging process.

[0029] Preferably, the method further comprises: configuring modular photovoltaic power generation devices with different voltage test ranges according to different test AC and DC voltage ranges.

[0030] According to the integrated charging and discharging test method based on a modular photovoltaic power generation device provided by the present invention, the integrated charging and discharging test system based on a modular photovoltaic power generation device described above is used to perform the following steps: the integrated charging and discharging test method based on a modular photovoltaic power generation device includes a mains charging test control method, a DC charging test control method, an AC discharge test control method and a DC discharge test control method according to different charging and discharging test conditions;

[0031] When the grid-connected solar energy storage and charging device performs a charging test, a DC charging test control method or a mains charging test control method is selected, and the main controller module controls the relay switch module to complete the test;

[0032] When the grid-connected solar storage and charging device performs a discharge test, a DC discharge test control method or an AC discharge test control method is selected, which is completed by the main controller module in cooperation with the relay switch module.

[0033] Preferably, the AC charging test control method comprises: when the main controller module is selected to enter the AC output charging mode, the power parameters, current parameters and energy parameters including charging are monitored, and when the grid-connected photovoltaic storage device reaches the charging threshold, the charging is stopped or restricted;

[0034] The DC charging test control method includes setting the charging voltage parameters and current parameters when the main controller module is selected to enter the programmable DC power supply module to enter the DC output charging mode, and stopping or limiting the charging when the grid-connected solar storage and charging device reaches the charging threshold.

[0035] Preferably, the DC discharge test control method includes collecting and monitoring the discharge power quality parameters, controlling the load characteristics, and selecting the grid simulation working conditions when the main controller module is selected to control the power analysis and grid-connected test module to enter the AC discharge mode, and when the grid-connected photovoltaic storage and charging device reaches the discharge threshold, the discharge is stopped or limited;

[0036] The AC discharge test control method includes collecting and monitoring discharge power quality parameters, controlling load characteristics, and selecting grid simulation working conditions when the main controller module is selected to control the power analysis and grid-connected test module to enter the AC discharge mode, and stopping or limiting the discharge when the grid-connected photovoltaic storage and charging device reaches the discharge threshold.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1. The present invention basically complies with the actual application conditions of charging and discharging of the current grid-connected photovoltaic storage and charging device, and performs reliable stability tests of the photovoltaic storage and charging device by simulating the most realistic working conditions.

[0039] 2. The present invention adopts a platform-type integrated design, is compatible with multiple working conditions, realizes the test system of the grid-connected photovoltaic storage and charging device, and greatly improves the test efficiency;

[0040] 3. The present invention has the characteristics of customization and productization through integrated modular design, and can meet the testing requirements of a wide voltage range.

[0041] 4. The charge and discharge control strategy of the present invention is simple and effective, and has high engineering application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0043] Figure 1 It is a structural schematic diagram of an integrated charging and discharging test system for a modular photovoltaic power generation device according to the present invention;

[0044] Figure 2 A schematic diagram of a control module of the integrated charging and discharging test system for a modular photovoltaic power generation device according to the present invention;

[0045] Figure 3 This is the control strategy flow of the integrated charging and discharging test system for modular photovoltaic power generation devices of the present invention. DETAILED DESCRIPTION

[0046] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0047] The present invention provides a modular photovoltaic power generation device integrated charging and discharging test system and control method, wherein the photovoltaic storage and charging device is composed of an energy storage module, a photovoltaic charging module, an inverter output and a mains charging module, and the overall functional interface covers a mains charging interface, a photovoltaic (DC) charging interface, a DC output interface, an AC output interface, a communication interface, etc. The present invention starts with the current standards and interface specifications of photovoltaic storage and charging devices, fully considers the performance indicators of each module in various types of grid-connected photovoltaic storage and charging devices and the requirements for voltage and frequency adaptability when connected to the grid, simulates various device charging and discharging test conditions and abnormal grid operation conditions, and refers to the charging and discharging power, voltage, power quality, grid adaptability, trouble-free operation time and other indicators of the grid-connected photovoltaic storage and charging device for assessment, which will significantly improve the reliability and stability of the grid-connected photovoltaic storage and charging device.

[0048] Example 1

[0049] The integrated charging and discharging test system based on the modular photovoltaic power generation device provided by the present invention comprises: a main controller module, a relay switch module, a programmable DC power supply module, a power analysis and grid-connected test module, an industrial computer and a grid-connected photovoltaic storage and charging power generation device;

[0050] The grid-connected optical storage and charging device is connected to the main controller module;

[0051] The relay switch module is connected to the main controller module;

[0052] The programmable DC power supply module is connected to the main controller module;

[0053] The mains power is connected to the main controller module;

[0054] The power analysis and grid connection test module is connected to the main controller module;

[0055] The industrial computer is connected to the main controller module.

[0056] The main controller module executes the preset control logic and cooperates with the host computer to perform charging and discharging operations;

[0057] The relay switch module is controlled by the main controller module to realize the opening and closing of the charging and discharging circuit;

[0058] The programmable DC power supply module is controlled by the main controller module to simulate the photovoltaic power generation characteristics as DC input during the charging operation;

[0059] The power analysis and grid-connected test module is controlled by the main controller module to simulate and test the inverter AC output power quality, various operating conditions of the power grid and load characteristics during the discharge operation;

[0060] The main control machine has the monitoring, operation and display functions of an integrated platform.

[0061] Specifically, the programmable DC power supply module is connected to the main controller module via a photovoltaic input interface.

[0062] Specifically, the mains power is connected to a mains power input interface, and the mains power input interface is connected to the main controller module.

[0063] Specifically, the industrial computer is connected to the main controller module via Ethernet.

[0064] Specifically, the main controller module is functionally expanded through a data conversion port; the functional expansion includes using a shunt, a voltmeter and / or an oscilloscope in conjunction with the data conversion port.

[0065] Specifically, the relay switch module includes a DC relay, an air switch, an AC contactor and / or a vacuum circuit breaker, and is operated in a small-to-large control mode.

[0066] Specifically, the programmable DC power supply module includes a photovoltaic characteristic DC input mode, a constant current floating charge mode and a constant voltage current reduction mode;

[0067] The photovoltaic characteristic DC input mode can set open circuit voltage parameters, short circuit current parameters, maximum power point voltage parameters and maximum power point current parameters.

[0068] Specifically, the power quality in the power analysis and grid-connected test module includes adjustable voltage, current, active power, reactive power, frequency, power factor, voltage / frequency regulation rate, voltage / frequency fluctuation rate, voltage waveform sinusoidal distortion rate and voltage setting range;

[0069] The various operating conditions of the power grid include: voltage deviation, frequency deviation, harmonics, voltage fluctuation and flicker and / or low voltage ride-through;

[0070] The load characteristics include an adjustable power factor.

[0071] Specifically, the main control machine includes monitoring the voltage, current, power, frequency, time, capacity, energy, temperature, power quality, grid simulation conditions and various load characteristics during the charging and discharging process through the main control module.

[0072] Specifically, it also includes: configuring modular photovoltaic power generation devices with different voltage test ranges according to different test AC and DC voltage ranges.

[0073] According to the integrated charging and discharging test method based on a modular photovoltaic power generation device provided by the present invention, the integrated charging and discharging test system based on a modular photovoltaic power generation device described above is used to perform the following steps: the integrated charging and discharging test method based on a modular photovoltaic power generation device includes a mains charging test control method, a DC charging test control method, an AC discharge test control method and a DC discharge test control method according to different charging and discharging test conditions;

[0074] When the grid-connected solar energy storage and charging device performs a charging test, a DC charging test control method or a mains charging test control method is selected, and the main controller module controls the relay switch module to complete the test;

[0075] When the grid-connected solar storage and charging device performs a discharge test, a DC discharge test control method or an AC discharge test control method is selected, which is completed by the main controller module in cooperation with the relay switch module.

[0076] Specifically, the AC charging test control method includes: when the main controller module is selected to enter the AC output charging mode, the power parameters, current parameters and energy parameters including charging are monitored, and when the grid-connected photovoltaic storage device reaches the charging threshold, the charging is stopped or restricted;

[0077] The DC charging test control method includes setting the charging voltage parameters and current parameters when the main controller module is selected to enter the programmable DC power supply module to enter the DC output charging mode, and stopping or limiting the charging when the grid-connected solar storage and charging device reaches the charging threshold.

[0078] Specifically, the DC discharge test control method includes collecting and monitoring the discharge power quality parameters, controlling the load characteristics, and selecting the grid simulation working conditions when the main controller module is selected to control the power analysis and grid-connected test modules to enter the AC discharge mode, and when the grid-connected photovoltaic storage device reaches the discharge threshold, the discharge is stopped or limited;

[0079] The AC discharge test control method includes collecting and monitoring discharge power quality parameters, controlling load characteristics, and selecting grid simulation working conditions when the main controller module is selected to control the power analysis and grid-connected test module to enter the AC discharge mode, and stopping or limiting the discharge when the grid-connected photovoltaic storage and charging device reaches the discharge threshold.

[0080] Example 2

[0081] Example 2 is a variation of Example 1

[0082] The purpose of the present invention is to provide a modular photovoltaic power generation device integrated charging and discharging test system and control method, starting from the index parameters of the current grid-connected photovoltaic storage and charging device, a charging and discharging control strategy is given; at the same time, a load characteristic and a modulation strategy for the grid simulation working condition are formulated for the actual operating conditions of the device inverter grid connection. The biggest advantage of the present invention is to maximize the use of the charging and discharging characteristic indicators of the photovoltaic storage and charging device to ensure the authenticity and effectiveness of its reliable stability test.

[0083] like Figure 1 The figure shows a schematic diagram of the structure of an integrated charging and discharging test system for a modular photovoltaic power generation device. The integrated platform includes a main controller module, a relay switch module, a programmable DC power supply module, a power analysis and grid-connected test module, and an industrial computer.

[0084] The modular photovoltaic power generation device integrated charge and discharge test system can be configured with modular integration for different voltage test ranges according to the different AC and DC voltage ranges. The AC voltage range is no more than 1000V ac, and the DC voltage range is no more than 1500V dc;

[0085] The main controller executes the established control logic and cooperates with the host computer to perform related charging and discharging operations; the main controller module can be functionally expanded and can be used in conjunction with any one or more combinations of shunts, voltmeters, oscilloscopes, etc.

[0086] The relay switch module is connected to the main controller module to perform the charging and discharging circuit disconnection action; the relay switch module can use any one or more combinations of DC relays, air switches, AC contactors, vacuum circuit breakers, etc., and can be operated in a small-to-large control mode.

[0087] The programmable DC power supply module is connected to the main controller module and can simulate the photovoltaic power generation characteristics as a DC input during the charging operation; the programmable DC power supply module is controlled by the main controller module and has a constant current floating charging mode and a constant voltage step-down charging mode in addition to a photovoltaic characteristic DC input mode;

[0088] Among them, the photovoltaic characteristic DC input mode can set parameters such as open circuit voltage, short circuit current, maximum power point voltage, maximum power point current parameters, etc.

[0089] The power analysis and grid-connected test module is connected to the main controller module, and can simulate and test the inverter AC output power quality and simulate various operating conditions and load characteristics of the power grid during the discharge operation; the power quality parameters in the power analysis and grid-connected test module can adjust voltage (U), current (I), active power (P), reactive power (Q), frequency (f), power factor (λ), voltage / frequency adjustment rate, voltage / frequency fluctuation rate, voltage waveform sinusoidal distortion rate, voltage setting range, etc.

[0090] Among them, the grid simulation working condition in the power analysis and grid-connected test module can select any working condition such as voltage deviation, frequency deviation, harmonics, voltage fluctuation and flicker, low voltage ride-through, etc.

[0091] Wherein, the load characteristics in the power analysis and grid-connected test module can adjust the power factor (λ);

[0092] The industrial computer is connected to the main controller module and has the monitoring, operation and display functions of an integrated platform; the industrial computer monitors the voltage, current, power, frequency, time, capacity, energy, temperature, power quality, power grid simulation conditions, various load characteristic simulations, etc. during the charging and discharging process through the main controller module.

[0093] A control method for a modular photovoltaic power generation device integrated charging and discharging test system, the control method according to different charging and discharging test conditions, including when a grid-connected photovoltaic storage and charging device performs a charging test, DC output charging or AC mains charging can be selected, which is completed by a main controller module in cooperation with a relay switch module; when a grid-connected photovoltaic storage and charging device performs a discharging test, DC input discharging or AC input discharging can be selected, which is completed by the main controller module in cooperation with the relay switch module.

[0094] Specifically, when the system performs a mains charging test on a grid-connected solar storage device, Figure 2 As shown, the test system uses the main controller module to cooperate with the relay switch module to turn on and off the AC input. The AC input can be used by the main controller in conjunction with a shunt, an electric meter, an oscilloscope, etc. to monitor the charging process parameters, such as voltage, current, power, temperature, etc.

[0095] Specifically, when the system performs a DC charging test on a grid-connected solar-storage charging device, Figure 2 As shown, the test system selects the DC source output mode through the main controller module in conjunction with the programmable DC power supply module, and turns the DC input on and off through the relay switch module.

[0096] Specifically, when the system performs a DC discharge test on a grid-connected solar storage device, Figure 2 As shown, the solar storage and charging device is in DC discharge mode, and the test system cooperates with the load analysis and grid-connected test module to select the discharge mode and cooperates with the relay switch module to turn on and off the DC output.

[0097] Specifically, when the system performs AC discharge test on the grid-connected photovoltaic storage device, Figure 2 As shown, the solar storage and charging device is in AC discharge mode, and the test system cooperates with the load analysis and grid-connected test module to simulate the grid operation condition, and cooperates with the relay switch module to turn on and off the DC output.

[0098] A control method for an integrated charging and discharging test system for a modular photovoltaic power generation device, wherein the control method includes a mains charging test control method, a DC charging test control method, an AC discharge test control method, and a DC discharge test control method according to different charging and discharging test conditions;

[0099] Specifically, when the system performs a mains charging test on a grid-connected solar storage device, Figure 3 As shown,

[0100] When the main controller module monitors the fluctuation of charging parameters, such as charging cutoff (charging current is 0), overpower, overtemperature, short circuit, reverse phase, etc., the system reports a fault and shuts down for processing. The solar storage charging device provides real-time feedback to the main controller module on various parameters such as charging voltage, current, frequency, average power, temperature, time, battery voltage, etc.

[0101] Specifically, when the system performs a DC charging test on a grid-connected solar-storage charging device, Figure 3 As shown in the figure, when the test system selects the photovoltaic characteristic DC source mode, the open circuit voltage V oc , short circuit current I sc , Maximum power point voltage V mp , Maximum power point current I mp The programmable DC power module provides real-time feedback to the main controller module on various charging parameters such as charging voltage, current, power, time, etc. When the main controller module detects fluctuations in charging parameters, such as charging cutoff (charging current is 0), overpower, overtemperature, short circuit, reverse connection, etc., the system reports an alarm or fault and shuts down for processing.

[0102] Specifically, when the system performs a DC charging test on a grid-connected solar-storage charging device, Figure 3As shown in the figure, when the test system selects the DC source mode of constant current floating charge and constant voltage current reduction, the charging cut-off voltage, charging current, and cut-off current need to be set. The programmable DC power supply module feeds back various charging parameters such as charging voltage, current, power, time, etc. to the main controller module in real time. When the main controller module monitors the fluctuation of charging parameters, such as charging cut-off (charging current is 0), overpower, overtemperature, short circuit, reverse connection, etc., the system reports an alarm or fault and shuts down for processing.

[0103] Specifically, when the system performs a DC discharge test on a grid-connected solar storage device, Figure 3 As shown in the figure, when the test system selects the constant current discharge mode, the current I, cut-off voltage U, and time t need to be set. The load test module provides real-time feedback of discharge current, voltage, capacity (Ah), energy (Wh), time, etc. When the main controller module monitors the fluctuation of discharge parameters, such as discharge cut-off (discharge current is 0), undervoltage, overtemperature, short circuit, reverse connection, etc., the system reports an alarm or fault and shuts down for processing.

[0104] Specifically, when the system performs a DC discharge test on a grid-connected solar storage device, Figure 3 As shown in the figure, when the test system selects the constant resistance discharge mode, the resistance R, cut-off voltage U, and time t need to be set. The load test module provides real-time feedback on discharge current, voltage, capacity (Ah), energy (Wh), time, etc. When the main controller module monitors the fluctuation of discharge parameters, such as discharge cut-off (discharge current is 0), undervoltage, overtemperature, short circuit, reverse connection, etc., the system reports an alarm or fault and shuts down for processing.

[0105] Specifically, when the system performs a DC discharge test on a grid-connected solar storage device, Figure 3 As shown in the figure, when the test system selects the constant power discharge mode, the power P, cut-off voltage U, and time t need to be set. The load test module provides real-time feedback on discharge current, voltage, capacity (Ah), energy (Wh), time, etc. When the main controller module monitors the fluctuation of discharge parameters, such as discharge cut-off (discharge current is 0), undervoltage, overtemperature, short circuit, reverse connection, etc., the system reports an alarm or fault and shuts down for processing.

[0106] Specifically, when the system performs a DC discharge test on a grid-connected solar storage device, Figure 3 As shown in the figure, when the test system selects the pulse discharge mode, the discharge current I, cut-off voltage U, and time interval need to be set. When the main controller module monitors the discharge parameters and sees fluctuations, such as discharge cut-off (discharge current is 0), undervoltage, overtemperature, short circuit, reverse connection, etc., the system reports an alarm or fault and shuts down for processing.

[0107] Specifically, when the system performs an AC discharge test on a grid-connected solar storage device, Figure 3As shown, the power analysis collects any parameters such as voltage (U), current (I), active power (P), reactive power (Q), frequency (f), power factor (λ), voltage / frequency adjustment rate, voltage / frequency fluctuation rate, voltage waveform sinusoidal distortion rate, voltage setting range, etc. The load characteristic can adjust the power factor (λ). The grid simulation working condition can be selected for voltage deviation, frequency deviation, harmonics, voltage fluctuation and flicker, low voltage ride-through and other working conditions. When the main controller module monitors the fluctuation of discharge parameters, such as discharge cutoff (discharge current is 0), undervoltage, overtemperature, short circuit, reverse connection, etc., the system reports an alarm or fault and shuts down for processing.

[0108] Those skilled in the art know that, in addition to implementing the system, device and its various modules provided by the present invention in a purely computer-readable program code, it is entirely possible to implement the same program in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers and embedded microcontrollers by logically programming the method steps. Therefore, the system, device and its various modules provided by the present invention can be considered as a hardware component, and the modules included therein for implementing various programs can also be considered as structures within the hardware component; the modules for implementing various functions can also be considered as both software programs for implementing the method and structures within the hardware component.

[0109] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. An integrated charging and discharging test system based on a modular photovoltaic power generation device, characterized in that: include: Main controller module, relay switch module, programmable DC power supply module, power analysis and grid-connected test module and industrial computer; The relay switch module is connected to the main controller module; The programmable DC power supply module is connected to the main controller module; The power analysis and grid connection test module is connected to the main controller module; The industrial computer is connected to the main controller module; The main controller module executes the preset control logic and cooperates with the host computer to perform charging and discharging operations; The relay switch module is controlled by the main controller module to realize the opening and closing of the charging and discharging circuit; The programmable DC power supply module is controlled by the main controller module to simulate the photovoltaic power generation characteristics as DC input during the charging operation; The power analysis and grid-connected test module is controlled by the main controller module to simulate and test the inverter AC output power quality, various operating conditions of the power grid and load characteristics during the discharge operation; The industrial computer has monitoring, operation and display functions of an integrated platform.

2. The integrated charging and discharging test system based on modular photovoltaic power generation device according to claim 1 is characterized in that: The main controller module is functionally expanded through the data conversion port; the functional expansion includes using a shunt, a voltmeter and / or an oscilloscope in conjunction with the data conversion port.

3. The integrated charging and discharging test system based on modular photovoltaic power generation device according to claim 1, characterized in that: The relay switch module includes a DC relay, an air switch, an AC contactor and / or a vacuum circuit breaker, and is operated in a small-to-large control mode.

4. The integrated charging and discharging test system based on modular photovoltaic power generation device according to claim 1, characterized in that: The programmable DC power supply module includes a photovoltaic characteristic DC input mode, a constant current floating charge mode and a constant voltage current reduction mode; The photovoltaic characteristic DC input mode can set open circuit voltage parameters, short circuit current parameters, maximum power point voltage parameters and maximum power point current parameters.

5. The integrated charging and discharging test system based on modular photovoltaic power generation device according to claim 1, characterized in that: The power quality in the power analysis and grid-connected test module includes adjustable voltage, current, active power, reactive power, frequency, power factor, voltage / frequency regulation rate, voltage / frequency fluctuation rate, voltage waveform sinusoidal distortion rate and voltage setting range; The various operating conditions of the power grid include: voltage deviation, frequency deviation, harmonics, voltage fluctuation and flicker and / or low voltage ride-through; The load characteristics include an adjustable power factor.

6. The integrated charging and discharging test system based on modular photovoltaic power generation device according to claim 1, characterized in that: The main controller module monitors the voltage, current, power, frequency, time, capacity, energy, temperature, power quality, grid simulation conditions and various load characteristics during the charging and discharging process.

7. The integrated charging and discharging test system based on modular photovoltaic power generation device according to claim 1, characterized in that: Also includes: According to the different AC and DC voltage ranges tested, modular photovoltaic power generation devices with different voltage test ranges are configured.

8. An integrated charging and discharging test method based on a modular photovoltaic power generation device, characterized in that: The integrated charging and discharging test system based on the modular photovoltaic power generation device described in any one of claims 1 to 7 is used to perform the following steps: the integrated charging and discharging test method based on the modular photovoltaic power generation device includes a mains charging test control method, a DC charging test control method, an AC discharge test control method and a DC discharge test control method according to different charging and discharging test conditions; When the grid-connected solar energy storage and charging device performs a charging test, a DC charging test control method or a mains charging test control method is selected, and the main controller module controls the relay switch module to complete the test; When the grid-connected solar storage and charging device performs a discharge test, a DC discharge test control method or an AC discharge test control method is selected, which is completed by the main controller module in cooperation with the relay switch module.

9. The integrated charging and discharging test method based on a modular photovoltaic power generation device according to claim 8, characterized in that: The AC charging test control method comprises: when the main controller module is selected to enter the AC output charging mode, the power parameters, current parameters and energy parameters including charging are monitored, and when the grid-connected photovoltaic storage device reaches the charging threshold, the charging is stopped or limited; The DC charging test control method includes setting the charging voltage parameters and current parameters when the main controller module is selected to enter the programmable DC power supply module to enter the DC output charging mode, and stopping or limiting the charging when the grid-connected solar storage and charging device reaches the charging threshold.

10. The integrated charging and discharging test method based on a modular photovoltaic power generation device according to claim 8, characterized in that: The DC discharge test control method includes collecting and monitoring discharge power quality parameters, controlling load characteristics, and selecting grid simulation working conditions when the main controller module is selected to control the power analysis and grid-connected test modules to enter the AC discharge mode, and stopping or limiting the discharge when the grid-connected photovoltaic storage and charging device reaches the discharge threshold; The AC discharge test control method includes collecting and monitoring discharge power quality parameters, controlling load characteristics, and selecting grid simulation working conditions when the main controller module is selected to control the power analysis and grid-connected test module to enter the AC discharge mode, and stopping or limiting the discharge when the grid-connected photovoltaic storage and charging device reaches the discharge threshold.

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