Factory energy storage test system

Abstract

The utility model discloses a factory energy storage test system which comprises a first low-voltage cabinet and an isolation transformer which is connected to the wire outlet end of the first low-voltage cabinet and provides electrical isolation. The second low-voltage cabinet is connected to one line outgoing end of the isolation transformer so as to protect and monitor the circuit; the third low-voltage cabinet is connected to the other line outlet end of the isolation transformer so as to protect and monitor the circuit; the energy storage converter is divided into two paths which are connected with the second low-voltage cabinet and the third low-voltage cabinet in a one-to-one correspondence manner to convert alternating current into direct current for output; and the cable switching cabinet is connected with the output positive and negative electrodes of the energy storage converter and the positive and negative electrodes of the battery cabin, so that electric energy flows between the energy storage converter and the battery cabin. The system can adapt to different voltage and power demand scenes, supports off-grid operation, grid-connected operation and testing in a twin-trawling mode, can be seamlessly switched between a grid-connected mode and an off-grid mode, can realize energy exchange between two groups of independent energy storage batteries, reduces energy consumption, improves energy efficiency, and reduces energy cost.

Description

Technical Field

[0001] The utility model relates to an energy storage test system, in particular to a plant energy storage test system. Background Art

[0002] As a new energy technology, the energy storage test system aims to solve the challenges brought by the access of renewable energy to the power grid. Although the application of new energy sources such as solar energy and wind energy is increasing, their intermittent and volatile nature makes the operation of the power grid face certain difficulties. In order to solve this problem, through data analysis and intelligent control, the plant energy storage test system can accurately predict load demand and accurately dispatch energy output, thereby reducing the peak-to-valley difference in electricity consumption and minimizing energy waste. There are some problems in the current background technology. First, the traditional power grid operation mode cannot effectively adapt to the unstable supply of renewable energy. Due to the instability of renewable energy, the power grid cannot predict and meet changes in demand, resulting in an imbalance between supply and demand. Secondly, the traditional power system cannot be interconnected with the main power grid, which limits the two-way transmission of energy and the effective use of energy. Utility Model Content

[0003] In order to solve the deficiencies existing in the above-mentioned technologies, the utility model provides a plant energy storage test system.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is a plant energy storage test system, including:

[0005] No. 1 low-voltage cabinet, connected to the power supply line to provide power;

[0006] Isolation transformer, connected to the outlet of No. 1 low-voltage cabinet to provide electrical isolation;

[0007] The No. 2 low-voltage cabinet is connected to one of the outgoing terminals of the isolation transformer to protect and monitor the circuit;

[0008] No. 3 low-voltage cabinet is connected to the other outgoing line end of the isolation transformer to protect and monitor the circuit;

[0009] The energy storage converter is divided into two paths and connected to the No. 2 low-voltage cabinet and the No. 3 low-voltage cabinet in a one-to-one manner to convert AC power into DC output;

[0010] The cable transfer cabinet connects the positive and negative output electrodes of the energy storage inverter and the positive and negative output electrodes of the battery compartment, allowing electrical energy to flow between the energy storage inverter and the battery compartment.

[0011] Furthermore, the No. 1 low-voltage cabinet includes a current transformer connected between the power supply line and the isolation transformer for monitoring the current in the circuit, and the secondary side of the current transformer is connected to the input terminal of the protection relay;

[0012] Also included are a plurality of miniature circuit breakers connected to the power supply incoming line for protecting the circuit from overload and short circuit;

[0013] Also included are industrial sockets that provide power access points.

[0014] Furthermore, the rated voltage of the power supply line is 0.4KV.

[0015] Furthermore, the rated capacity of the isolation transformer is 400KVA, the voltage on the input side of the isolation transformer is 0.4KV, and the voltage on the output side of the isolation transformer is 0.4KV or 0.69KV.

[0016] Furthermore, the rated voltage of the AC input side of the energy storage inverter is 0.4KV or 0.60KV or 0.69KV, the rated frequency is 50HZ, and the corresponding maximum output power is 2.2MW or 3.3MW or 3.795MW; the rated voltage of the DC output side is 0.4KV or 0.60KV or 0.69KV, the corresponding DC channel power is 1000kW or 1500kW, and the corresponding DC voltage operating range is 0.6-1KV or 1KV-1.5KV or 0.875KV-1.500KV.

[0017] Furthermore, the cable switching cabinet uses a cable with a cross-section of 185 square millimeters to connect the positive and negative poles of the energy storage inverter and the positive and negative poles of the battery compartment. The DC side of the energy storage inverter is divided into two output channels that are independently connected to the battery compartment, and the AC side of the energy storage inverter is connected in parallel.

[0018] The utility model discloses a plant energy storage test system, which supports multiple voltage platforms and power requirements and can adapt to different voltage and power demand scenarios. In addition, it supports off-grid operation, grid-connected operation, and testing using a towing mode, which makes it widely applicable. The system can seamlessly switch between grid-connected and off-grid modes, and can realize energy exchange between two groups of independent energy storage batteries, which can reduce energy consumption, improve energy efficiency, and reduce energy costs. At the same time, the system includes a variety of protection measures, such as current transformers, miniature circuit breakers, and industrial sockets, which are used to protect circuits and provide safety protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the electrical principle structure of the utility model. DETAILED DESCRIPTION

[0020] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0021] like Figure 1 The plant energy storage test system shown is a plant energy storage test system, which in this example includes:

[0022] The No. 1 low-voltage cabinet is connected to the power supply line and provides a rated voltage of 0.4KV. The No. 1 low-voltage cabinet includes a current transformer connected between the power supply line and the isolation transformer for monitoring the current in the circuit, and the secondary side of the current transformer is connected to the input end of the protection relay. It also includes a two-stage miniature circuit breaker with a rated current of 32A connected to the power supply line to protect the single-phase circuit from overload and short circuit; a three-pole miniature circuit breaker with rated currents of 40A, 50A, and 63A is used to protect the three-phase circuit from electrical faults such as overload and short circuit; it also includes industrial sockets that provide power access points. There are three types of industrial sockets, including single-phase five-hole industrial sockets with a rated current of 10A; single-phase three-hole industrial sockets with a rated current of 16A, and three-phase four-hole industrial sockets with a rated current of 16A, which are used for power output, electrical connection and safety protection.

[0023] The isolation transformer is connected to the outlet of the No. 1 low-voltage cabinet to provide electrical isolation; the rated capacity of the isolation transformer is 400KVA, the voltage on the input side of the isolation transformer is 0.4KV, and the voltage on the output side of the isolation transformer is 0.4KV or 0.69KV.

[0024] The No. 2 low-voltage cabinet is connected to one of the outgoing terminals of the isolation transformer to protect and monitor the circuit.

[0025] No. 3 low-voltage cabinet is connected to the other outgoing terminal of the isolation transformer to protect and monitor the circuit.

[0026] The energy storage inverter is divided into two paths, one-to-one connected to the No. 2 low-voltage cabinet and the No. 3 low-voltage cabinet to convert AC power into DC output; the rated voltage of the AC input side of the energy storage inverter is 0.4KV or 0.60KV or 0.69KV, the rated frequency is 50HZ, and the corresponding maximum output power is 2.2MW or 3.3MW or 3.795MW; the rated voltage of the DC output side is 0.4KV or 0.60KV or 0.69KV, the corresponding DC channel power is 1000kW or 1500kW, and the corresponding DC voltage working range is 0.6-1KV or 1KV-1.5KV or 0.875KV-1.500KV. The energy storage inverter is the core component of the system, which is used to convert electrical energy between different forms. In the charge and discharge test, the energy storage inverter converts the AC power of the power grid into DC power to charge the energy storage battery, or converts the DC power of the energy storage battery into AC power and feeds it back to the power grid. The energy storage inverter in the system is 3450kW, which can independently control active power and reactive power and support grid-connected operation.

[0027] The cable transfer cabinet connects the output positive and negative poles of the energy storage inverter and the positive and negative poles of the battery compartment, so that electric energy can flow between the energy storage inverter and the battery compartment. The cable transfer cabinet uses a cable with a cross-section of 185 square millimeters to connect the positive and negative poles of the energy storage inverter and the positive and negative poles of the battery compartment. The DC side of the energy storage inverter is divided into two output channels, which are independently connected to the battery compartment, and the AC side of the energy storage inverter is connected in parallel.

[0028] In the off-grid drag mode, the system uses the energy storage inverter with two channels on the DC side, and each channel is connected to an independent energy storage battery pack, and the AC side is connected in parallel. The working mode and operating parameters of each inverter can be set independently through the touch screen or remote monitoring. This mode allows energy conversion between two energy storage battery packs without connecting to the external power grid. In the drag mode, the energy storage inverter is not connected to the grid, and the power-on self-test: when the system starts, the energy storage inverter will perform a self-test to ensure that all sensors and control systems are intact; one of the channels is set to the off-grid operation mode to establish an AC voltage source for the system (AC400V, AC600V, AC690V can be set), and the other channel can be set to the constant power mode (P / Q mode), and the active power and reactive power can be set for charging and discharging operations, which can realize the energy exchange between two independent energy storage batteries.

[0029] The current flows out of the battery compartment 1 and is converted into AC power by the energy storage converter 1. The converted AC power passes through the isolation transformer and reaches the energy storage converter 2; the energy storage converter 2 converts the AC power into DC power again and flows to the battery compartment 2 for charging; the whole process is a closed loop, making it possible to exchange energy between two independent energy storage batteries, and the system is not connected to the external power grid. This allows the performance of the energy storage battery pack to be tested without relying on the external power grid, such as its charging and discharging capabilities, response time, and power control accuracy.

[0030] In the grid-connected mode, the AC side of the energy storage inverter is connected to the grid through an isolation transformer. When connected to the grid for charging and discharging, the energy storage inverter can work in power mode and constant current mode. The power absorbed and discharged from the grid must not exceed the capacity of the transformer and the grid-connected switch. The AC power from the grid is sent to the energy storage inverter through an isolation transformer. In the charging stage, the energy storage inverter will work in constant current or constant power mode to convert AC power into DC power for the battery to store energy; in the discharging stage, the energy storage battery pack releases DC power, and the energy storage inverter converts it into AC power and sends it back to the grid.

[0031] Among them, the key advantage of adopting the grid-connected mode is that it can optimize the charging and discharging cycle of energy storage batteries according to grid demand or economic signals (such as changes in electricity prices), thereby improving energy efficiency and reducing energy costs. In addition, the system can also provide auxiliary services to the grid, such as frequency regulation and demand response, to enhance the stability and reliability of the grid.

[0032] In summary, the plant energy storage test system of this patent can improve the stability of the power grid, reduce energy waste, optimize energy costs, support the access of renewable energy to the power grid, and provide auxiliary services for the power grid. It has important practical value and economic benefits. It has the following main advantages:

[0033] The system supports multiple voltage platforms and power requirements, and can adapt to different voltage and power demand scenarios. In addition, it supports off-grid operation, grid-connected operation, and testing using towing mode, which makes it widely applicable. The system can seamlessly switch between grid-connected and off-grid modes, and can realize energy exchange between two sets of independent energy storage batteries, which can reduce energy consumption, improve energy efficiency, and reduce energy costs. At the same time, this system includes a variety of protection measures, such as current transformers, miniature circuit breakers, and industrial sockets, which are used to protect circuits and provide safety protection.

[0034] The above implementation modes are not limitations of the present invention, and the present invention is not limited to the above examples. Any changes, modifications, additions or substitutions made by technicians in this technical field within the technical solution of the present invention also belong to the protection scope of the present invention.

Claims

1. A plant energy storage test system, characterized in that: include: No. 1 low-voltage cabinet, connected to the power supply line to provide power; An isolation transformer, connected to the outlet terminal of the No. 1 low-voltage cabinet to provide electrical isolation; A No. 2 low-voltage cabinet is connected to one of the outgoing terminals of the isolation transformer to protect and monitor the circuit; A No. 3 low-voltage cabinet is connected to the other outgoing line terminal of the isolation transformer to protect and monitor the circuit; The energy storage converter is divided into two paths and connected to the No. 2 low-voltage cabinet and the No. 3 low-voltage cabinet in a one-to-one manner to convert AC power into DC output; The cable transfer cabinet connects the positive and negative output electrodes of the energy storage inverter and the positive and negative output electrodes of the battery compartment, allowing electrical energy to flow between the energy storage inverter and the battery compartment.

2. The plant energy storage test system according to claim 1, characterized in that: The No. 1 low-voltage cabinet includes a current transformer connected between the power supply line and the isolation transformer for monitoring the current in the circuit, and the secondary side of the current transformer is connected to the input end of the protection relay; Also included are a plurality of miniature circuit breakers connected to the power supply incoming line for protecting the circuit from overload and short circuit; Also included are industrial sockets that provide power access points.

3. The plant energy storage test system according to claim 1, characterized in that: The rated voltage of the power supply line is 0.4KV.

4. The plant energy storage test system according to claim 1, characterized in that: The rated capacity of the isolation transformer is 400KVA, the voltage on the input side of the isolation transformer is 0.4KV, and the voltage on the output side of the isolation transformer is 0.4KV or 0.69KV.

5. The plant energy storage test system according to claim 1, characterized in that: The rated voltage of the AC input side of the energy storage inverter is 0.4KV or 0.60KV or 0.69KV, the rated frequency is 50HZ, and the corresponding maximum output power is 2.2MW or 3.3MW or 3.795MW; the rated voltage of the DC output side is 0.4KV or 0.60KV or 0.69KV, the corresponding DC channel power is 1000kW or 1500kW, and the corresponding DC voltage working range is 0.6-1KV or 1KV-1.5KV or 0.875KV-1.500KV.

6. The plant energy storage test system according to claim 1, characterized in that: The cable switching cabinet uses a cable with a cross-section of 185 square millimeters to connect the positive and negative poles of the energy storage inverter and the positive and negative poles of the battery compartment. The DC side of the energy storage inverter is divided into two output channels that are independently connected to the battery compartment, and the AC side of the energy storage inverter is connected in parallel.

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