Transient voltage safety control method and system

Abstract

The invention provides a transient voltage safety control method and system. The method comprises the steps of: when it is detected that faults generate, cutting off a static var compensator device; controlling a rotor-side converter to provide real-time reactive power support to a power grid; when the faults are recovered, re-accessing the cut-off static var compensator into the power grid for operation; and recovering the rotor-side converter to a steady state constant voltage control mode. The transient voltage safety control method and system can inhibit the wind turbine group off-networkrisk caused by the reactive excess in a wind power plant concentrated grid-connected area after the power system suffers from large disturbance.

Description

technical field [0001] The invention relates to the technical field of new energy power generation and access, in particular to a transient voltage safety control method and system. Background technique [0002] In recent years, wind power has gradually developed from the status quo of "small-scale decentralized development and local consumption" to "large-scale centralized development and long-distance high-voltage transmission". Areas rich in wind resources plan and build 10 million-kilowatt wind power bases. However, most of these wind power bases are located at the end of the power grid with relatively weak grid structure and relatively simple power structure, and the system voltage sensitivity is relatively strong. After major disturbances such as short circuit and disconnection of the power grid, the grid-connected areas of these wind farm clusters are prone to voltage instability due to reactive power over-compensation or under-compensation, and eventually cause the w...

AI Technical Summary

Problems solved by technology

On the one hand, the structural characteristics and operating characteristics of the grid-connected area of ​​large-scale wind farms will bring many challenges to the voltage security of the system

On the other hand, with the rapid popularization of variable-speed wind turbines and the wide application of reactive power compensation equipment in wind farms, most wind farms are equipped with various reactive power control devices with time constants ranging from milliseconds to seconds. The operation coordination of time-scale reactive power equipment has also become another major factor affecting the voltage security of the power system after large-scale wind power is connected to the grid.

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