Grounding protection method and system based on centralized new energy grid connection mode

Abstract

The invention provides a grounding protection method and system based on a centralized new energy grid connection mode. Wiring modes and related grounding modes of grid connection primary systems of awind field and a photovoltaic power station are determined, and protection tripping or line selection tripping is determined in combination with a specific grounding capacitance current value; and according to the grounding modes of the wind field and the photovoltaic power station, corresponding over-current protection and zero-sequence over-current protection schemes are configured, and fault sequence network analysis is carried out by adopting a symmetric component method to further determine the protection tripping scheme. Tripping and shunt tripping strategies determined by the determined protection scheme make special requirements for guaranteeing rapid fault removal, avoiding overvoltage and the like; and the needs of two-party protection and safe and stable operation are met at the same time on the premise that the selection is unified with a power system.

Description

technical field [0001] The present disclosure relates to a grounding protection method and system based on a centralized new energy grid-connected manner. Background technique [0002] The statements in this section are merely background technical information provided by the inventors related to the present disclosure and do not necessarily constitute prior art. [0003] With the continuous development of new energy and grid access, whether it is from the main wiring method or the relay protection configuration and algorithm, relevant specifications have been defined, and the whole set of solutions is becoming more and more mature. How to select and adopt protection and control strategies suitable for local wind farms or photovoltaic access in these regulations is an important issue at present. But the general principle is that while ensuring the safe and stable operation of the power grid, at the same time attach importance to the safe operation of new energy access plants...

AI Technical Summary

Problems solved by technology

However, some wind farms use a low-resistance grounding method when the single-phase grounding capacitance current is large, but this method is different from the grounding method on the grid-connected side, which requires synchronously changing the grounding and protection methods on the grid side

However, the current grounding protection scheme cannot meet the above requirements

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