Photovoltaic grid-connected simulation test system

Abstract

The invention relates to the technical field of photovoltaic grid-connected simulation testing, and discloses a photovoltaic grid-connected simulation testing system which comprises a platform system, a solar cell array simulator, a photovoltaic inverter, a household energy storage system, a charging pile, a program-controlled adjustable load, a metering module and an intelligent circuit breaker. The solar cell array simulator is used for simulating the output characteristics of a solar cell panel, the photovoltaic inverter is used for converting variable direct current voltage into alternating current with mains supply frequency, the household energy storage system is used for adjusting charging and discharging time and charging and discharging power, and the program-controlled adjustable load is used for simulating the charging load of the charging pile. The metering module is used for monitoring power utilization information of each functional module in the system, and the intelligent circuit breaker is used for remotely controlling on-off and state feedback. The energy storage system improves the power supply reliability and stability of the micro-grid, and at the same time, the system carries out all-weather data acquisition and analysis, monitors the operation states and health conditions of the photovoltaic system, the energy storage system and the charging pile, and integrates the monitoring system, the energy management and the function test.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaic grid-connected simulation testing, and more specifically, to a photovoltaic grid-connected simulation testing system. Background Art

[0002] The photovoltaic grid-connected simulation system is a small intelligent power generation and distribution system composed of photovoltaics, energy storage devices, charging piles, simulated loads, and monitoring and protection devices. It is an autonomous system capable of self-control, protection and management. It can be connected to the external power grid or operate in isolation.

[0003] For example, a prior patent with authorization announcement number CN114678894A discloses a distributed photovoltaic grid-connected simulation method and system based on power control, including: obtaining relevant parameters, the relevant parameters including a voltage drop identification value, a decrease slope, a recovery slope and a machine cutting time; inputting the relevant parameters into a distributed photovoltaic model based on power control, the model entering a voltage drop condition when the voltage at the distributed photovoltaic grid-connected point drops to the voltage drop identification value; after entering the voltage drop condition, the active power decreases according to the decrease slope; after entering the voltage drop condition and exceeding the machine cutting time, the distributed photovoltaic machine is cut; after entering the voltage drop condition, returning to normal within a specified time, and the voltage at the distributed photovoltaic grid-connected point is restored according to the recovery slope.

[0004] In the existing technology, the data of the photovoltaic grid-connected simulation system is incomplete and there is a lack of photovoltaic monitoring, which leads to insufficient power supply reliability and stability of the microgrid. Summary of the invention

[0005] The purpose of the present invention is to provide a photovoltaic grid-connected simulation test system, aiming to solve the problem of insufficient power supply reliability and stability of microgrids in the prior art.

[0006] The present invention is implemented as follows: a photovoltaic grid-connected simulation test system includes a platform system, a solar cell array simulator, a photovoltaic inverter, a household energy storage system, a charging pile, a programmable adjustable load, a metering module and an intelligent circuit breaker. The solar cell array simulator, the photovoltaic inverter, the household energy storage system, the charging pile, the programmable adjustable load, the metering module and the intelligent circuit breaker are all connected to the platform system; the solar cell array simulator is used to simulate the output characteristics of the solar cell panel, the photovoltaic inverter is used to convert the variable DC voltage generated by the battery array simulator into AC power with a mains frequency, the household energy storage system is used to adjust the charging and discharging time and charging and discharging power, the charging pile is used to simulate the charging scenario of multiple users, the programmable adjustable load is used to simulate the charging load of the charging pile, the metering module is used to monitor the power consumption information of each functional module in the system, and the intelligent circuit breaker is used to remotely control the on-off and status feedback.

[0007] Furthermore, the photovoltaic grid-connected simulation test system includes a photovoltaic grid-connected box, and the solar cell array simulator, the photovoltaic inverter, the household energy storage system, the programmable adjustable load and the metering module are respectively installed inside the photovoltaic grid-connected box.

[0008] Furthermore, the household energy storage system includes a battery charger, a battery component and a BMS management system, and the photovoltaic inverter, the battery charger, the battery component and the BMS management system are arranged in an integrated manner.

[0009] Furthermore, the solar cell array simulator is used to simulate the output characteristics of monocrystalline silicon, polycrystalline silicon, and amorphous silicon solar cell panels, and the output IV characteristics of the actual circuit can be arranged in a consistent manner with the solar cell array simulated by the solar cell array simulator.

[0010] Furthermore, the photovoltaic grid-connected simulation test system includes a communication gateway, which is used for device communication, protocol parsing, and instruction forwarding.

[0011] Furthermore, the platform system includes a concentrator, which is used for regular reading of terminal data, command transmission, data communication, network management, event recording, and horizontal transmission of data; the solar cell array simulator, the photovoltaic inverter, the household energy storage system, the charging pile, the programmable adjustable load, the metering module and the intelligent circuit breaker are respectively arranged with the concentrator for signal transmission.

[0012] Furthermore, the photovoltaic grid-connected simulation test system includes multiple electric energy AC meters and multiple branch circuit breakers, each electric energy AC meter and each branch circuit breaker is arranged in a one-to-one correspondence, the branch circuit breaker corresponds to a device access point, the electric energy AC meter and the metering module are used to measure and monitor the power consumption of the equipment; each of the electric energy AC meters transmits the metering data to the concentrator.

[0013] Furthermore, the concentrator includes a file synchronization interface and a file change interface, the platform system has a system-level interface, the system-level interface is docked with the file synchronization interface and the file change interface, the system-level interface is information synchronized with the substation, and the substation is the range where a transformer is responsible for power supply.

[0014] Furthermore, the intelligent circuit breaker supports remote control on / off and status feedback, and the intelligent circuit breaker includes two control modes, namely terminal remote control signal control and communication control on / off.

[0015] Furthermore, the photovoltaic grid-connected simulation test system includes a terminal computer and a display, wherein the display is used to display the operating status of the master station control software and each unit of the system, and the terminal computer is used to run the platform system.

[0016] Compared with the prior art, the photovoltaic grid-connected simulation test system provided by the present invention simulates the process of solar panels converting solar energy into electrical energy through a solar cell simulation array device, thereby providing a power source for the microgrid; the energy storage system is responsible for storing excess electrical energy to cope with the situation of no sunlight or insufficient sunlight, thereby ensuring the stable operation of the microgrid. The introduction of the energy storage system not only solves the problem that photovoltaic power generation is greatly affected by weather and geographical location, but also improves the power supply reliability and stability of the microgrid; through the coordination of various modules, it meets the access of photovoltaic systems, energy storage systems, load systems and charging piles, performs data collection and analysis around the clock, monitors the operating status and health status of photovoltaics, energy storage systems and charging piles, and integrates monitoring systems, energy management and functional testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the framework of the photovoltaic grid-connected simulation test system provided by the present invention; Figure 2 It is a schematic diagram of the metering topology of the photovoltaic grid-connected simulation test system provided by the present invention; Figure 3 It is a schematic diagram of the system architecture of the photovoltaic grid-connected simulation test system provided by the present invention; Figure 4 It is a functional schematic diagram of the photovoltaic grid-connected simulation test system provided by the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] The implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0020] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0021] Reference Figure 1-4 The figure shows a preferred embodiment of the present invention.

[0022] The photovoltaic grid-connected simulation test system includes a platform system, a solar cell array simulator, a photovoltaic inverter, a household energy storage system, a charging pile, a programmable adjustable load, a metering module and an intelligent circuit breaker. The solar cell array simulator, the photovoltaic inverter, the household energy storage system, the charging pile, the programmable adjustable load and the metering module and the intelligent circuit breaker are all connected to the platform system; the solar cell array simulator is used to simulate the output characteristics of the solar cell panel, the photovoltaic inverter is used to convert the variable DC voltage generated by the battery array simulator into AC power with a mains frequency, the household energy storage system is used to adjust the charging and discharging time and charging and discharging power, the charging pile is used to simulate the charging scenario of multiple users, the programmable adjustable load is used to simulate the charging load of the charging pile, the metering module is used to monitor the power consumption information of each functional module in the system, and the intelligent circuit breaker is used to remotely control the on-off and status feedback.

[0023] The above-mentioned photovoltaic grid-connected simulation test system simulates the process of solar panels converting solar energy into electrical energy through a solar cell simulation array to provide a source of electricity for the microgrid; the energy storage system is responsible for storing excess electrical energy to cope with the situation of no sunlight or insufficient sunlight, to ensure the stable operation of the microgrid. The introduction of the energy storage system not only solves the problem that photovoltaic power generation is greatly affected by weather and geographical location, but also improves the power supply reliability and stability of the microgrid; through the coordination of various modules, it meets the access of photovoltaic systems, energy storage systems, load systems and charging piles, conducts data collection and analysis around the clock, monitors the operating status and health of photovoltaics, energy storage systems and charging piles, and integrates monitoring systems, energy management, and functional testing.

[0024] The photovoltaic grid-connected simulation test system includes a photovoltaic grid-connected box, a solar cell array simulator, a photovoltaic inverter, a household energy storage system, a programmable adjustable load and a metering module which are respectively installed inside the photovoltaic grid-connected box.

[0025] The photovoltaic grid-connected box is an important safety component of the photovoltaic system, which is operated in a mode where the user generates electricity for his own use and the excess electricity is connected to the grid. It has the function of protecting the safe operation of the system to the greatest extent, ensuring the safe coordination between the inverter and the mains power grid, and improving the system reliability and electricity metering.

[0026] The household energy storage system includes a battery charger, battery components and a BMS management system, and the photovoltaic inverter, battery charger, battery components and BMS management system are integrated.

[0027] The household energy storage system integrates inverters, battery chargers, batteries and BMS management systems into a pre-wired modular system, supporting both offline and online modes of operation; the charging and discharging time and charging and discharging power can be adjusted according to system strategy requirements AC charging piles are used to simulate multi-user charging scenarios and simulate different scenarios to improve the accuracy of simulation tests.

[0028] The solar cell array simulator is used to simulate the output characteristics of monocrystalline silicon, polycrystalline silicon, and amorphous silicon solar panels. The output IV characteristics of the actual circuit can be arranged in a consistent manner with the solar cell array simulated by the solar cell array simulator.

[0029] Under the simulation of the solar cell array simulator, the output characteristics of the solar cell array are simulated, and the output characteristics of monocrystalline silicon, polycrystalline silicon, and amorphous silicon solar panels are simulated to meet different simulation needs. At the same time, the output IV characteristics of the actual circuit can be consistent with the simulated solar cell array, thereby improving the accuracy of the simulation test.

[0030] The photovoltaic grid-connected simulation test system includes a communication gateway, which is used for device communication, protocol analysis, and instruction forwarding.

[0031] The programmable adjustable load is used to simulate the charging load of the AC charging pile. It is used to simulate the general power load. The load power can be adjusted through the platform.

[0032] Metering module, a high-performance AC and DC measurement module with advanced isolation function, provides real-time monitoring of key data such as high-precision current, voltage, and power; it is used to monitor the power consumption information of each functional module in the system.

[0033] Photovoltaic inverters can convert the variable DC voltage generated by the solar cell array simulator into AC power at the mains frequency, which can be fed back to the commercial power transmission system or used in off-grid power grids. Photovoltaic inverters are one of the important system balancers in photovoltaic array systems and can be used in conjunction with general AC-powered equipment. Photovoltaic inverters have special functions for photovoltaic arrays, such as maximum power point tracking and islanding effect protection.

[0034] The platform system includes a concentrator, which is used for regular reading of terminal data, command transmission, data communication, network management, event recording, and horizontal transmission of data; a solar cell array simulator, a photovoltaic inverter, a household energy storage system, a charging pile, a programmable adjustable load, a metering module, and an intelligent circuit breaker are arranged with the concentrator for signal transmission.

[0035] The photovoltaic grid-connected simulation test system includes multiple electric energy AC meters and multiple branch circuit breakers. Each electric energy AC meter and each branch circuit breaker is arranged in a one-to-one correspondence. A branch circuit breaker corresponds to a device access point. The electric energy AC meter and the metering module are used to measure and monitor the power consumption of the equipment; each electric energy AC meter transmits the metering data to the concentrator.

[0036] The concentrator includes a file synchronization interface and a file change interface. The platform system has a system-level interface. The system-level interface is connected to the file synchronization interface and the file change interface. The system-level interface is synchronized with the substation in information synchronization. The substation is the area where a transformer is responsible for power supply.

[0037] The system-level interface mainly realizes the synchronization of basic information and change information of substations, concentrators, and meter archives.

[0038] Intelligent circuit breakers support remote control on / off and status feedback, and intelligent circuit breakers include two control modes, namely terminal remote control signal control and communication control on / off; they can rigidly control console areas to merge and disconnect and control load loading.

[0039] The communication control on and off is RS485 communication control on and off.

[0040] The photovoltaic grid-connected simulation test system includes a terminal computer and a display. The display is used to display the operating status of the main station control software and each unit of the system, and the terminal computer is used to run the platform system.

[0041] The core of the simulation management system is to manage various types of simulation experimental equipment, realize the full process collection of simulation operation data, assist laboratory personnel to conduct more comprehensive analysis, and build distributed photovoltaic monitoring and grid-connected capability simulation.

[0042] Full-process data monitoring capability: full-process monitoring of electrical data in simulated substations can be achieved through concentrators, electric meters, etc.; status monitoring of each intelligent device and monitoring of control interactions can be achieved; analog data monitoring of solar storage and charging of various power sources and flexible load equipment can be achieved.

[0043] Simulation control of intelligent equipment: management of collection relationship files and parameters after replacement of simulated area concentrators; various control commands can be issued to realize control simulation of various intelligent equipment; various control commands can be issued to realize simulation control of photovoltaic, energy storage, charging piles and flexible loads.

[0044] System function: The simulation management system simulates various equipment and equipment parameters, and uses the feedback of various electrical data to evaluate and analyze the impact of various changes on the actual operating power grid, and realizes the access, data collection and monitoring functions of various laboratory equipment.

[0045] Simulation management system architecture: Front-end interface: Based on WPF, it implements a user-friendly graphical interface and provides data display and operation interface.

[0046] Backend service: Using .NET Core Database: MongoDB is used to store system status and operation data to ensure efficient data reading and writing.

[0047] Data visualization: Use the LiveCharts2 library to dynamically display data and support real-time monitoring.

[0048] The essence of the simulation management system is the simulation control of various laboratory facilities and the recording of operation data. The main functions of this system include real-time monitoring, data query, collection management, control management, file management, parameter management and other interactive functions, communication management, data collection management, interactive control management and other background functions, as well as interactive interfaces with the collection system.

[0049] Large-screen overview: The large-screen display outputs and displays the summary monitoring data, including the number of devices, device status, real-time data, etc.

[0050] Real-time monitoring: panoramic monitoring of electricity consumption information, including overall electrical data of meters, branches, and substations; status and electrical data monitoring of photovoltaic, energy storage, and adjustable loads; status monitoring of intelligent control equipment such as smart circuit breakers; providing control buttons for merging / separating substations; providing control buttons for photovoltaic, energy storage, and adjustable loads; providing control buttons for intelligent control equipment such as smart circuit breakers; providing intelligent alarms and record management for abnormal operations; providing real-time monitoring of key indicators, such as equipment communication, voltage, current, power, etc.

[0051] Data query: query of historical electricity consumption data of substations, branches and meters, supporting graphical viewing; query of historical operation data of photovoltaics, energy storage, etc., supporting graphical viewing; query of simulation control and abnormal record, supporting graphical mixed display, displaying all kinds of data before and after control together, facilitating analysis of data changes brought about by various control simulations.

[0052] Collection management: Provides connection status viewing for various devices, and provides call-up for various parameters and data, including real-time data and historical data; provides historical data collection success rate query based on collection tasks, and provides supplementary collection function; provides management of collection tasks, and management of task start conditions such as collection cycle and collection interval.

[0053] Control management: Provide interactive control management of various types of equipment, and provide control execution record display, including whether the control is successful; display of historical control records of each device and simultaneous viewing of related data; can monitor the status of the substation controller, and realize remote control of substation merging / partitioning through the protocol.

[0054] File management: management of addition, deletion and modification of laboratory simulation area and concentrator files, supporting synchronization with the acquisition system; management of addition, deletion and modification of laboratory simulation acquisition files, supporting synchronization with the acquisition system, providing one-click replacement of associated concentrators; management of addition, deletion and modification of files of various simulation equipment in the laboratory Equipment parameter management: Provides the functions of testing, comparing, saving and modifying equipment parameters; provides the management of issuing equipment parameters and records whether the issuing is successful.

[0055] Configuration structure diagram: Provides system simulation flow and branch switch status configuration diagram.

[0056] System interface: provides a system-level interface to connect with the collection file interface; mainly realizes the synchronization of basic information and change information of the substation, concentrator and meter files.

[0057] A software platform for realizing photovoltaic grid-connected simulation system can improve the intelligent level of energy management, optimize the scheduling strategy of photovoltaic and energy storage, and improve the efficiency and economy of system operation. Example

[0058]

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Photovoltaic grid-connected simulation test system, characterized in that: It includes a platform system, a solar cell array simulator, a photovoltaic inverter, a household energy storage system, a charging pile, a programmable adjustable load, a metering module and an intelligent circuit breaker. The solar cell array simulator, the photovoltaic inverter, the household energy storage system, the charging pile, the programmable adjustable load, the metering module and the intelligent circuit breaker are all connected to the platform system; the solar cell array simulator is used to simulate the output characteristics of the solar cell panel, the photovoltaic inverter is used to convert the variable DC voltage generated by the battery array simulator into AC power with a mains frequency, the household energy storage system is used to adjust the charging and discharging time and charging and discharging power, the charging pile is used to simulate the charging scenario of multiple users, the programmable adjustable load is used to simulate the charging load of the charging pile, the metering module is used to monitor the power consumption information of each functional module in the system, and the intelligent circuit breaker is used to remotely control the on-off and status feedback.

2. The photovoltaic grid-connected simulation test system according to claim 1, characterized in that: The photovoltaic grid-connected simulation test system comprises a photovoltaic grid-connected box, and the solar cell array simulator, the photovoltaic inverter, the household energy storage system, the programmable adjustable load and the metering module are respectively arranged inside the photovoltaic grid-connected box.

3. The photovoltaic grid-connected simulation test system according to claim 1, characterized in that: The household energy storage system includes a battery charger, a battery component and a BMS management system, and the photovoltaic inverter, the battery charger, the battery component and the BMS management system are arranged in an integrated manner.

4. The photovoltaic grid-connected simulation test system according to claim 1, characterized in that: The solar cell array simulator is used to simulate the output characteristics of monocrystalline silicon, polycrystalline silicon, and amorphous silicon solar cell panels. The output IV characteristics of the actual circuit can be arranged in a consistent manner with the solar cell array simulated by the solar cell array simulator.

5. The photovoltaic grid-connected simulation test system according to claim 1, characterized in that: The photovoltaic grid-connected simulation test system includes a communication gateway, which is used for device communication, protocol analysis, and instruction forwarding.

6. The photovoltaic grid-connected simulation test system according to any one of claims 1 to 5, characterized in that: The platform system includes a concentrator, which is used for regular reading of terminal data, command transmission, data communication, network management, event recording, and horizontal transmission of data; the solar cell array simulator, the photovoltaic inverter, the household energy storage system, the charging pile, the programmable adjustable load, the metering module and the intelligent circuit breaker are respectively arranged with the concentrator for signal transmission.

7. The photovoltaic grid-connected simulation test system according to claim 6, characterized in that: The photovoltaic grid-connected simulation test system includes multiple electric energy AC meters and multiple branch circuit breakers, each electric energy AC meter and each branch circuit breaker is arranged in a one-to-one correspondence, the branch circuit breaker corresponds to a device access point, the electric energy AC meter and the metering module are used to measure and monitor the power consumption of the equipment; each electric energy AC meter transmits the metering data to the concentrator.

8. The photovoltaic grid-connected simulation test system according to claim 6, characterized in that: The concentrator includes a file synchronization interface and a file change interface, and the platform system has a system-level interface. The system-level interface is docked with the file synchronization interface and the file change interface, and the system-level interface is information synchronized with the substation, which is the area where a transformer is responsible for power supply.

9. The photovoltaic grid-connected simulation test system according to any one of claims 1 to 5, characterized in that: The intelligent circuit breaker supports remote control on / off and status feedback, and the intelligent circuit breaker includes two control modes, namely terminal remote control signal control and communication control on / off.

10. The photovoltaic grid-connected simulation test system according to any one of claims 1 to 5, characterized in that: The photovoltaic grid-connected simulation test system includes a terminal computer and a display, wherein the display is used to display the operating status of the master station control software and each unit of the system, and the terminal computer is used to run the platform system.

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