链式STATCOM的改进型逆系统滑模控制策略研究  

Research on Improved Inverse System Sliding Mode Control Strategy for Chain STATCOM

作　　者：朱红萍[1] 周振怿 李毅 危鸿达 尹逸之 ZHU Hongping;ZHOU Zhenyi;LI Yi;WEI Hongda;YIN Yizhi(School of Information and Electrical Engineering,Hunan University of Science and Technology,Xiangtan 411201,China)

机构地区：[1]湖南科技大学信息与电气工程学院,湘潭411201

出　　处：《电力系统及其自动化学报》2021年第1期70-77,共8页Proceedings of the CSU-EPSA

基　　金：国家自然科学基金资助项目(61973109)。

摘　　要：为提高链式静止同步补偿器STATCOM(static synchronous compensator)系统的解耦精确度和抗扰动能力,提出一种改进型逆系统滑模控制策略。首先采用DSOGI-PLL电流检测法结合对称分量法在系统不平衡工况下建立稳态逆系统解耦数学模型,进而得到正负序有功、无功调制信号。结合改进变速趋近律的滑模控制及载波相移正弦波脉宽调制CPS-SPWM(carrier phase shift-sinusoidal pulse width modulation),完成系统控制器的设计。通过仿真结果表明,采用本文所提出的控制策略与PI控制方法相比较,装置的动态响应能力、补偿系统无功能力更好、鲁棒性更强,验证了所提控制策略的正确性和可行性。To improve the decoupling accuracy and anti-disturbance capability of a chain static synchronous compensator(STATCOM)system,an improved inverse system sliding mode control strategy is proposed.First,the DSOGI-PLL current detection method combined with the symmetric component method is used to establish a mathematical model of steady-state inverse system coupling under unbalanced conditions,thereby obtaining the positive-and negative-sequence active and reactive modulation signals.Then,combined with the sliding mode control of improved variablespeed reaching law and the carrier phase shift-sinusoidal pulse width modulation(CPS-SPWM),the design of the system controller is completed.Simulation results show that compared with the PI control method,the control strategy proposed in this paper has better dynamic response capability of the device,better reactive capability of the compensation system,and stronger robustness,which verifies its correctness and feasibility.

关 键 词：链式静止同步补偿器 逆系统解耦 滑模控制 不平衡工况 鲁棒性 

分 类 号：TM761[电气工程—电力系统及自动化]