Electric generator reactive power output emergency control method based on wide area measurement system

Abstract

The invention discloses an electric generator reactive power output emergency control method based on a wide area measurement system. Electric generator excitation reference voltage step control is used as a means, the problem that key busbar voltages are too long in drop duration is solved by increasing electric generator reactive power output, a power plant unit which participates in excitation control is selected according to the size of increment measure of the key busbar voltages which participate in one-percent increment step control over voltage control power plant excitation reference voltages, the excitation reference voltage step controlled quantity of the unit which participates in control is determined according to the generator terminal voltage upper limit of the unit which participates in excitation reference voltage step control, and therefore the voltage quality of the system is improved through online electric generator excitation control. In the emergency control process based on dynamic response, only the reactive power output of electric generators in the region where a key busbar is located and regions adjacent to the region where the key busbar is located needs to be adjusted, the cost is low, the situation of voltage recovery of the key busbar after failures can be effectively improved or restrained, and the whole voltage stability of the system is improved.

Description

technical field [0001] The invention relates to the technical field of voltage stability and generator reactive power control, in particular to an emergency control method for generator reactive power output based on a wide-area measurement system. Background technique [0002] Since the advent of the Global Synchronous Positioning System (GPS) and the Phasor Measurement Unit (PMU), the power angle of the generator and the bus voltage phasor can be realized within the wide-area measurement range of the power system by using the precise synchronous clock of GPS as the synchronization signal. The real-time monitoring of the entire power grid can be observed, and the wide-area measurement technology provides a key measurement method for the safe and stable operation of the power grid. In 1994, the Western Power System Coordinating Committee (WSCC) launched the Wide Area Measurement System (Wide Area Measurement System, WAMS) program. The wide-area measurement system has been w...

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Problems solved by technology

[0006] As an important dynamic reactive power source of the power system, the generator starts the excitation control when the system fault voltage drops, and can quickly output reactive power to provide reactive power support for the key bus voltage drop of the system. However, the existing grid voltage restoration technology , when a power system failure occurs, the key bus voltage drops for too long, causing the grid voltage to fail to recover in time, resulting in poor overall voltage stability of the intelligence system

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