成碧可控串补工程中阻尼控制试验分析

甘肃成县-碧口线220kV可控串补(thyristorcontrolledseriescompensator,TCSC)工程是我国第一个可控串补国产化示范工程,甘肃陇南地区电网为典型长线弱送端系统,系统稍有扰动或者增加机组出力,成碧线就会出现低频振荡。介绍了成碧系统采用电力系统稳定器(powersystemstabilizer,PSS)以及TCSC阻尼低频振荡的控制方案,系统试验结果表明,成碧线TCSC可有效抑制低频振荡,且TCSC和PSS之间可以实现协调配合。

Test and Analysis on Low Frequency Oscillation Damping Control in TCSC Project for 220 kV Transmission Line from Cheng County to Bikou in Gansu Province

The thyristor controlled series compensation(TCSC)project for 220kV transmission line from Cheng County to Bikou(abbr.Cheng-Bi transmission line)in Gansu Province is the first domestic-manufactured demonstration project of TCSC in China.The Longnan regional power network in Gansu province is a typical long distance power transmission system with weak sending end,as soon as this system has a little bit of disturbance or the active power output of generating units increases,low frequency oscillation will occur.As the first on-site test to repress low frequency power oscillation by TCSC in the world,the authors propose a control scheme to damp the low frequency oscillation occurred in Cheng-Bi transmission line by use of power system stabilizer(PSS)and TCSC.Results of on-site tests show that by means of TCSC the low frequency oscillation in Chen-Bi transmission line can be effectively repressed and the coordination between TCSC and PSS can be implemented.