Nr Electric Co., Ltd

State Grid Corporation of China

Nr Engineering Co., Ltd

State Grid Zhejiang Electric Power Research Institute

Long Wu

Bing Han

Chengyu Lu

Kuayu Wu

Hongtao Xiong

Yijun Shen

Boliang Lou

Weiqun Liu

Xiangjian Shi

Xiaoming Huang

Jiahua Lu

Cencen Lu

Haiqing Lu

A novel reactive power overexcitation regulation technology for synchronous generator, comprises measuring a stator voltage, a stator current, an active power and a reactive power of the synchronous generator; calculating the allowable upper limit value of the reactive power of the generator according to the allowable stator current of stator heating, and calculating the allowable value of the reactive power of the minimum stator current of the generator according to the contact reactance between the generator and the grid; comparing the stator current with its allowable value, calculate the excess calorific value of the stator of the generator if the calculated actual stator current is larger than its allowable value, enter reactive power overexcitation limiting regulation mode if the excess calorific value of the generator reaches the upper limit of the allowable heating margin of the generator; and using the larger value between the allowable upper limit value of the reactive power and the allowable value of the reactive power as the goal value of the reactive power regulation to maintain the output reactive power of the generator equal to the goal value. The present invention can protect the safety of the generator, and is beneficial to support the grid voltage to improve the stability of the power system performance.

Reactive power overexcitation regulation technology for synchronous generator

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

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Jiangsu, China

Long Wu