Energy storage twin trawling test system

Abstract

The utility model provides an energy storage twin trawling test system. The energy storage twin trawling test system comprises a first test unit, a second test unit and an isolation transformer, the first test unit comprises a first test battery system, a first test battery management system and a first energy storage converter; the second test unit comprises a second test battery system, a second test battery management system and a second energy storage converter; the first test unit and the second test unit are connected through corresponding energy storage converters; the first test unit and the second test unit are electrically connected with a secondary winding of the isolation transformer through the corresponding energy storage converters respectively; and the primary winding of the isolation transformer is connected with the low-voltage side of the power grid. According to the invention, independent shutdown can be realized when any test unit fails, and the other test unit can be switched to a zero-power operation mode to realize fault interlocking when any test unit fails to stop, so that tripping of a grid-connected transformer switch due to reverse power of a grid-connected point is avoided.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to an energy storage towing test system. Background Art

[0002] At present, energy storage system integration manufacturers consider factors such as the limited capacity of factory grid-connected transformers, the inconvenience of transformer expansion, or the cost of purchasing large-capacity transformers exceeding the budget. When designing energy storage battery compartment towing test systems, they usually choose smaller capacity transformers to connect to the low-voltage side of the factory power grid, and do not configure an energy management system for power allocation. Instead, they conduct tests by manually controlling the system power difference between the two test units. However, human errors or test equipment failures often occur during the test, causing the front-end grid-connected transformer switch to trip, resulting in fines for reverse power tripping at the grid connection point and the risk of abnormal power outages and losses to other normal working equipment in the factory. Utility Model Content

[0003] The present application provides an energy storage pair-drag test system, comprising a first test unit, a second test unit and an isolation transformer;

[0004] The first test unit includes a first test battery system, a first test battery management system and a first energy storage converter; the second test unit includes a second test battery system, a second test battery management system and a second energy storage converter;

[0005] In the first test unit, the first energy storage inverter and the first test battery system are respectively connected to the first test battery management system, and the first energy storage inverter and the first test battery system are connected via a first switch;

[0006] In the second test unit, the second energy storage converter and the second test battery system are respectively connected to the second test battery management system, and the second energy storage converter and the second test battery system are connected via a second switch;

[0007] The first test unit and the second test unit are connected via their corresponding energy storage converters;

[0008] The first test unit and the second test unit are electrically connected to the secondary winding of the isolation transformer through their corresponding energy storage converters respectively;

[0009] The primary winding of the isolation transformer is connected to the low-voltage side of the power grid.

[0010] In one example, the first test battery management system is connected to the first energy storage inverter through dry contacts, the second test battery management system is connected to the second energy storage inverter through dry contacts, the first energy storage inverter is connected to the second energy storage inverter through dry contacts, and the second energy storage inverter is connected to the first energy storage inverter through dry contacts.

[0011] In one example, the test battery management system of each test unit includes a dry contact fault signal output;

[0012] Each test battery management system is configured to output a fault signal to the corresponding energy storage inverter through a dry contact when the corresponding test battery system or the test battery management system is abnormal.

[0013] In one example, each energy storage converter includes two dry contact fault signal inputs and one dry contact fault signal output;

[0014] Two dry contact fault signal inputs of each energy storage converter, one dry contact fault signal input is configured to switch to a fault shutdown state upon receiving a dry contact fault signal output by a corresponding test battery management system; the other dry contact fault signal input is configured to switch to a zero power operation mode upon receiving a dry contact fault signal output by another energy storage converter in the towing test system;

[0015] One dry contact fault signal output of each energy storage inverter is configured to output a dry contact fault signal to another energy storage inverter in the towing test system when receiving a dry contact fault signal output by the corresponding test battery management system or when the energy storage inverter itself fails.

[0016] In one example, the another dry contact fault signal input is further configured to maintain a zero-power operation mode upon receiving a dry contact recovery signal output by another energy storage converter in the towing test system.

[0017] In one example, the dry contact fault signal and the dry contact recovery signal output by each energy storage converter are pulse signals.

[0018] In one example, the first test battery management system is connected to the first test battery system for sampling, and the second test battery management system is connected to the second test battery system for sampling;

[0019] Each test battery management system is configured to collect the battery voltage, battery temperature, and battery remaining capacity of the corresponding test battery system.

[0020] The energy storage pair test system provided above can not only realize independent shutdown when any test unit fails, but also when any test unit fails and shuts down, the other test unit switches to zero power operation mode to achieve fault interlocking, thereby avoiding the grid-connected transformer switch from tripping due to reverse power at the grid connection point. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the energy storage towing test system provided in an embodiment of the present application.

[0022] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer and more understandable, the present application 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 application and are not used to limit the present application.

[0024] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0025] Figure 1 A schematic diagram of an energy storage towing test system provided in an embodiment of the present application.

[0026] like Figure 1 As shown, the 10kV grid voltage is stepped down to 400V after passing through the grid-connected transformer, and a load and an energy storage pair-drag test system are hung on the 400V bus. The energy storage pair-drag test system includes a first test unit, a second test unit and an isolation transformer.

[0027] Among them, the first test unit includes a first test battery system, a first test battery management system and a first energy storage inverter; the second test unit includes a second test battery system, a second test battery management system and a second energy storage inverter. In the first test unit, the first energy storage inverter and the first test battery system are respectively connected to the first test battery management system, and the first energy storage inverter and the first test battery system are connected through a first switch. In the second test unit, the second energy storage inverter and the second test battery system are respectively connected to the second test battery management system, and the second energy storage inverter and the second test battery system are connected through a second switch. The first test unit and the second test unit are connected through their corresponding energy storage inverters. The first test unit and the second test unit are electrically connected to the secondary winding of the isolation transformer through their corresponding energy storage inverters. The primary winding of the isolation transformer is connected to the low-voltage side of the power grid through a third switch, that is, connected to the Figure 1 On the 400V busbar in.

[0028] The voltage of the secondary winding of the isolation transformer is the same as the AC rated voltage of the first energy storage converter and the second energy storage converter.

[0029] The first test battery management system is connected to the first energy storage inverter through a dry contact, and the second test battery management system is connected to the second energy storage inverter through a dry contact, so that any test unit can be shut down independently when it fails. At the same time, the first energy storage inverter is connected to the second energy storage inverter through a dry contact, and the second energy storage inverter is connected to the first energy storage inverter through a dry contact. When any test unit fails and shuts down, the other test unit can be switched to zero power operation mode to achieve fault interlocking, thereby avoiding the grid-connected transformer switch from tripping due to reverse power at the grid connection point.

[0030] The first test battery management system is connected to the first test battery system for sampling, and the second test battery management system is connected to the second test battery system for sampling. Each test battery management system is configured to collect information such as battery voltage, battery temperature, and battery remaining power of the corresponding test battery system.

[0031] The test battery management system of each test unit includes one dry contact fault signal output. Each energy storage converter includes two dry contact fault signal inputs and one dry contact fault signal output.

[0032] Each test battery management system is configured to output a fault signal to the corresponding energy storage inverter through a dry contact when the corresponding test battery system or the test battery management system is abnormal.

[0033] Each energy storage inverter has two dry contact fault signal inputs, one of which is configured to switch to a fault shutdown state upon receiving a dry contact fault signal output by the corresponding test battery management system; the other is configured to switch to a zero-power operation mode upon receiving a dry contact fault signal output by another energy storage inverter in the towing test system.

[0034] In one embodiment, the other path is further configured to maintain the zero-power operation mode upon receiving a dry contact recovery signal output by another energy storage converter in the towing test system, and wait for manual control to adjust the zero-power operation mode.

[0035] One dry contact fault signal output of each energy storage inverter is configured to output a dry contact fault signal to another energy storage inverter in the towing test system when receiving a dry contact fault signal output by the corresponding test battery management system or when the energy storage inverter itself fails.

[0036] The dry contact fault signal and dry contact recovery signal output by each energy storage converter are pulse signals, and the duty cycle or output time can be flexibly set according to the specific application.

[0037] The preferred embodiments of the present application are described above with reference to the accompanying drawings, but the scope of the present application is not limited thereby. Any modification, equivalent substitution and improvement made by a person skilled in the art without departing from the scope and essence of the present application shall be within the scope of the present application.

Claims

1. An energy storage towing test system, characterized in that: It includes a first test unit, a second test unit and an isolation transformer; The first test unit includes a first test battery system, a first test battery management system and a first energy storage converter; the second test unit includes a second test battery system, a second test battery management system and a second energy storage converter; In the first test unit, the first energy storage inverter and the first test battery system are respectively connected to the first test battery management system, and the first energy storage inverter and the first test battery system are connected via a first switch; In the second test unit, the second energy storage converter and the second test battery system are respectively connected to the second test battery management system, and the second energy storage converter and the second test battery system are connected via a second switch; The first test unit and the second test unit are connected via their corresponding energy storage converters; The first test unit and the second test unit are electrically connected to the secondary winding of the isolation transformer through their corresponding energy storage converters respectively; The primary winding of the isolation transformer is connected to the low-voltage side of the power grid.

2. The energy storage towing test system according to claim 1 is characterized in that: The first test battery management system is connected to the first energy storage inverter through dry contacts, the second test battery management system is connected to the second energy storage inverter through dry contacts, the first energy storage inverter is connected to the second energy storage inverter through dry contacts, and the second energy storage inverter is connected to the first energy storage inverter through dry contacts.

3. The energy storage towing test system according to claim 2 is characterized in that: The test battery management system of each test unit includes a dry contact fault signal output; Each test battery management system is configured to output a fault signal to the corresponding energy storage inverter through a dry contact when the corresponding test battery system or the test battery management system is abnormal.

4. The energy storage towing test system according to claim 2, characterized in that: Each energy storage converter includes two dry contact fault signal inputs and one dry contact fault signal output; Two dry contact fault signal inputs of each energy storage converter, one dry contact fault signal input is configured to switch to a fault shutdown state upon receiving a dry contact fault signal output by a corresponding test battery management system; the other dry contact fault signal input is configured to switch to a zero power operation mode upon receiving a dry contact fault signal output by another energy storage converter in the towing test system; One dry contact fault signal output of each energy storage inverter is configured to output a dry contact fault signal to another energy storage inverter in the towing test system when receiving a dry contact fault signal output by the corresponding test battery management system or when the energy storage inverter itself fails.

5. The energy storage towing test system according to claim 4 is characterized in that: The other dry contact fault signal input is further configured to maintain a zero-power operation mode when receiving a dry contact recovery signal output by another energy storage converter in the towing test system.

6. The energy storage towing test system according to claim 5, characterized in that: The dry contact fault signal and dry contact recovery signal output by each energy storage converter are pulse signals.

7. The energy storage towing test system according to claim 1, characterized in that: The first test battery management system is connected to the first test battery system for sampling, and the second test battery management system is connected to the second test battery system for sampling; Each test battery management system is configured to collect the battery voltage, battery temperature, and battery remaining capacity of the corresponding test battery system.

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