TCSC模式切换控制方法的研究

STUDY ON MODE-SWITCHING CONTROL METHOD OF TCSC

可 控 串 联 补 偿 ( Thyristor Controlled SeriesCompensation,TCSC)的模式切换对电力系统的稳定控制具有重要意义,是 TCSC 的关键问题之一。文章在仿真建模的基础上,提出了一套切实可行的TCSC 模式切换策略。通过强制晶闸管支路电流与线路电流同步,实现由容性微调或Block 模式到 Bypass 模式的切换;在由容性微调或 Block 模式到感性微调的切换策略中提出了容许区间触发的方法。为及时向切换控制提供线路电流同步信号,提出了一种预测电流过零的方法。仿真结果表明,文章提出的切换策略能使切换过程平稳迅速,且动态特性良好,具有较强的实用性。

The mode-switching control of thyristor controlled series compensation (TCSC) is important to power system stability control and is also one of the key problems of TCSC. On the basis of modeling and simulation, a practicable mode-switching control strategy was proposed. By means of forced synchronization of current in thyristor branch with the line current, the mode switching from capacitive veriner mode or block mode to bypass mode can be implemented. In the switching strategy from capacitive veriner mode or Block mode to inductive veriner mode a method of allowed-section triggering was put forward. To provide synchronization signal of line current for switching control in time, a method to forecast the crossover point of the current was given. Simulation results show that the proposed switching strategy possesses good dynamic performance and can make the mode switching process stationary, fast and is practical.