基于干扰观测器的级联H桥STATCOM相间电压平衡控制  

Interphase Voltage Balance Control of Cascaded Hbridge STATCOM Based on Disturbance Observer

作　　者：刘旭峰 高云广[1] 孙凯亮 LIU Xufeng;GAO Yunguang;SUN Kailiang(School of Electronic and Information Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China)

机构地区：[1]太原科技大学电子信息工程学院,太原030024

出　　处：《电力电容器与无功补偿》2024年第6期1-9,共9页Power Capacitor & Reactive Power Compensation

基　　金：山西省自然科学基金面上项目(202203021211201)。

摘　　要：针对级联H桥STATCOM在复杂工况下电网电压跌落和不平衡引起的相间电容电压不平衡问题,提出了基于干扰观测器DOB的前馈控制。通过研究级联H桥STATCOM的功率分布状况,分析了级联H桥STATCOM相间不平衡原因,将负序功率视为扰动进行负序功率前馈,并考虑模型差异以及各种干扰引起的偏差影响,根据交流侧与直流侧有功功率交换情况,将直流功率经DOB观测后前馈至相间电压平衡控制的输出端,以零序功率注入实现级联H桥STATCOM相间电压平衡控制。最后在Matlab/Simulink建立了级联H桥STATCOM仿真模型,仿真结果验证了在复杂工况下,该控制策略能够提升系统相间电压平衡的快速性、跟随性和鲁棒性。In view of imbalance of interphase capacitive voltage due to grid voltage drop and imbalance of cascaded Hbridge STATCOM under complicated conditions,a feedforward control based on disturbance observer is proposed.The power distribution of the cascaded Hbridge STATCOM is studied,and the reason of interphase unbalance of the cascaded Hbridge STATCOM is analyzed.The negative sequence power is regarded as disturbance for negative sequence power feedforward.Considering the model difference and the influence of deviation caused by various disturbances and also according to the active power exchange between AC side and DC side,the DC power is feedforward to the output end of interphase voltage balance control after DOB observation,and the interphase voltage balance control of the cascaded Hbridge STATCOM is achieved by zero sequence power injection.Finally,a cascaded Hbridge STATCOM simulation model is set up in MATLAB/Simulink.The simulation results verify that the control strategy can improve the rapidity,follow ability and robustness of the interphase voltage balance of the system under complicated conditions.

关 键 词：级联H桥STATCOM 相间电压平衡控制 前馈控制 干扰观测器 

分 类 号：TM761.12[电气工程—电力系统及自动化]