基于能量函数及PID算法的TCSC控制策略  

TCSC Control Strategy Based on Energy Function and PID Algorithm

作　　者：罗远翔[1] 陈秀华 刘铖[1] LUO Yuanxiang;CHEN Xiuhua;LIU Cheng(School of Electrical Engineering,Northeast Electric Power University,Jilin 132012,China)

机构地区：[1]东北电力大学电气工程学院,吉林132012

出　　处：《电力系统及其自动化学报》2021年第10期37-42,共6页Proceedings of the CSU-EPSA

基　　金：吉林省优秀青年人才基金资助项目(20180520067JH)。

摘　　要：可控串联补偿TCSC可以连续调节输电线路的阻抗、阻尼系统的振荡,提高系统暂态稳定性。首先,采用暂态能量函数TEF值对系统稳定性进行量化,推导出仅含支路信息的TEF对时间的导数表达式,以导数值最小为目标,制定系统中支路的TCSC装置控制策略。在此基础上,加入PID连续控制方式,提高TCSC的控制精度,精准调节TCSC对线路电抗的补偿值达到控制策略所得阻抗值。最后,在单机无穷大系统上进行仿真验证。结果表明:提高TCSC控制精度能够有效避免系统在大扰动后发电机首摆失稳,并能提高振荡收敛速度。推广至多机系统,仿真结果表明:该控制策略同样具有优越性。Thyristor controlled series compensation(TCSC)can continuously adjust the impedance value of transmission line,damp the system oscillations,and improve the system’s transient stability.First,the value of transient energy function(TEF)is used to quantify the system stability,and the derivative expression of TEF with respect to time is derived only based on the branch information.Afterwards,the minimal derivative value is taken as the objective,thus formulating the control strategy for the TCSC device on the branch in the system.On this basis,in order to better realize the response of TCSC to the line impedance obtained by the control strategy,it is necessary to add the PID continuous control mode and improve the control accuracy of TCSC.Finally,simulations are conducted on a one-machine infinite bus system,and results show that the improved control accuracy of TCSC can effectively avoid the first-swing instability of the generator in the system after a large disturbance and improve the oscillation convergence speed.Moreover,the PID control method is extended to a multi-machine system,and simulation results show that the proposed control strategy is also advantageous.

关 键 词：PID控制 电力系统 暂态能量函数 暂态稳定性 可控串联补偿 

分 类 号：TM712[电气工程—电力系统及自动化]