State Grid Corporation of China

Nr Electric Co., Ltd

State Grid Zhejiang Electric Power Research Institute

State Grid Zhejiang Electric Power Co., Ltd. Research Institute

Kuayu Wu

Chengyu Lu

Xiaoming Huang

Hongtao Xiong

Boliang Lou

Ying Yang

Jiancheng Zhang

Bing Han

Yijun Shen

Long Wu

Haiqing Lu

Weizhen Sun

Wen Hua

Cencen Lu

Jiahua Lu

Qiulong Ni

The present application discloses a flexible excitation system and a method for controlling the same. The flexible excitation system consists of a plurality of groups of flexible excitation power units connected in parallel, a deexcitation circuit unit and a flexible excitation control unit. The method for controlling the flexible excitation system includes: realizing the internal fault-tolerant operation control of the flexible excitation power units by cooperatively controlling AC circuit breakers and DC circuit breakers of the flexible excitation power units and a deexcitation switch; dynamically controlling ceiling voltage when terminal voltage drops by using the fast response control ability of the flexible excitation system, so as to improve the forced excitation output capacity of the self-shunt excitation system. Aiming at the possible overload problem of an excitation transformer during the operation of flexible excitation, an excitation transformer overload limiter for the flexible excitation system is provided to limit the operation state of the excitation transformer within an allowable overload operation range of equipment.

Flexible excitation system and control method therefor

A low-frequency band suppression enhanced anti-reversal power system stabilizer is presented by the invention. Currently the widely used PSS2B power system stabilizer needs lead elements above Order 2 to meet the phase compensation requirement of DC blocking signal of active power, thus quickly increasing high-frequency band gain, restricting allowable total setting gain of PSS, limiting low-band gain and reducing low-frequency band suppression ability of power system stabilizer. The invention will add generator speed signal &#x3c9; (which is treated by DC blocking element and corrected by parallel proportional differential PD) and active power signal P(which is treated by DC blocking element and gained by gain factor K) to get equivalent synthetic mechanical power of power system stabilizer. The actual active power signal gained by gain factor Kcan meet the requirement of phase compensation through Order 1 lead and lag elements, thus increasing allowable total setting gain of PSS and improving the ability of low-frequency band oscillation suppression.

Low-frequency band suppression enhanced anti-reversal power system stabilizer

Growing community of inventors

Zhejiang, China

Kuayu Wu