Large-scale battery storage power station interface protection method based on single-ended break variable of current

A technology of battery energy storage and single-ended current, which is applied in the direction of protection against overcurrent, etc., can solve problems such as unsuitable use, large impedance value of energy storage power station, etc., and achieve the effect of improving reliability

Active Publication Date: 2013-04-17
STATE GRID FUJIAN ELECTRIC POWER CO LTD +2
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Problems solved by technology

However, since the neutral point of my country's distribution network is usually not directly grounded, and the equivalent impedance value of the energy storage power station is relatively large in the event of a fault, the negative sequence current and zero sequence current are relatively small, so this criterion is not suitable for use

Method used

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  • Large-scale battery storage power station interface protection method based on single-ended break variable of current
  • Large-scale battery storage power station interface protection method based on single-ended break variable of current
  • Large-scale battery storage power station interface protection method based on single-ended break variable of current

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Embodiment Construction

[0038] Best embodiment:

[0039] The interface protection method of large-scale battery energy storage power station based on the sudden change of single-ended current includes the following steps:

[0040] (1) Provide current transformers and voltage transformers, which are connected to the interface protection installation place, collect the three-phase current and three-phase voltage at the protection installation place, as the power required for the protection element, and the current transformer wiring form adopts standard wiring ;

[0041] (2) The current value and the phase difference between current and voltage at the previous time are recorded by the memory element, and the value collected at the next time is used as a reference;

[0042] (3) Calculate the difference between the current and phase at this moment and the current and phase value at the previous moment, and compare the current sudden changes;

[0043] (4) Compare the sudden change of current with the setting value...

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Abstract

The invention relates to a protection starting method for an interface between a large-scale energy storage power station and a power grid, in particular to a large-scale battery storage power station interface protection method based on single-ended break variable of current. According to the method provided by the invention, the single-ended break variable of current is utilized to provide protection for the large-scale battery storage power station interface, only the single-ended current and voltage information quantities are needed; and the problems that the distributed power supply which is tied in grids through an inverter is low in reliability and sensitiveness while using the conventional three-section current protection and current sequence component are solved; under various fault conditions, the fault can be reliably detected, the simulation result shows that the method has higher protective sensitiveness and reliability, and the fault can be removed by reliable actions in two-phase short circuit, two-phase grounded short circuit and three-phase short circuit outside the grid.

Description

Technical field [0001] The invention relates to a protection start method for the interface of a large energy storage power station and a power grid, in particular to a protection method for the interface of a large battery energy storage power station based on a single-ended current mutation. Background technique [0002] With the continuous consumption of traditional fossil energy and the continuous serious environmental pollution, the technological development of new energy has become one of the signs of the development of the times. As a distributed power source with strong operational stability, battery energy storage power station can achieve a stable power output when mixed with other volatile distributed power sources; for large battery energy storage power stations (capacity greater than 1MW), generally The line is directly connected to the distribution network, which plays a role in peak regulation and valley filling of the grid. [0003] When the external power grid fai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/08
Inventor 吴文宣
Owner STATE GRID FUJIAN ELECTRIC POWER CO LTD
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