LC耦合式级联STATCOM及其控制策略  

LC coupled cascaded STATCOM and its control strategy

作　　者：成佳富 何志兴[2] 周钦贤 易伟浪 周芊帆 CHENG Jiafu;HE Zhixing;ZHOU Qinxian;YI Weilang;ZHOU Qianfan(Huizhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Huizhou 516003,China;National Electric Power Conversion and Control Engineering Technology Research Center,Hunan University,Changsha 410082,China)

机构地区：[1]广东电网有限责任公司惠州供电局,广东惠州516003 [2]湖南大学国家电能变换与控制工程技术研究中心,湖南长沙410082

出　　处：《电力自动化设备》2018年第10期127-132,139,共7页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(51477045)~~

摘　　要：不同于常规电感滤波式的静止同步补偿器(STATCOM),LC耦合式级联STATCOM(LC-STATCOM)输出滤波器采用电感和电容串联结构,在容性无功补偿、运行效率等方面更具优势。分析了LC-STATCOM的工作原理和运行性能,并建立离散状态方程。针对LC串联存在谐振的问题,提出了适用于LC-STATCOM的状态反馈控制,可以有效地增大谐振阻尼,改善系统基频增益,提高电流控制性能;基于所推导的离散状态方程,构建了输出电容电压状态观测器,利用电压观测值进行状态反馈可以省去电容电压传感器,降低成本。Unlike the conventional L-filter STATCOM, LC-STATCOM（ LC coupled cascaded STATCOM） output filter adopts a series structure of inductance and capacitance, which has more advantages in capacitive reactive compensa- tion and operation efficiency. The working principle and operating performance of LC-STATCOM are analyzed, and the discrete state equations are derived. In view of the resonance caused by LC series, a state feedback control method is proposed for LC-STATCOM to increase the resonant damping, improve the system fundamental-frequency gain and advance the current control performance. Furthermore, a capacitor voltage observer is built to estimate the voltage of output capacitor. Therefore, the auxiliary capacitor voltage sensor can be saved by using the voltage observation in the state feedback control, which decreases the cost.

关 键 词：级联多电平 静止同步补偿器 综合补偿 状态反馈控制 无功控制 

分 类 号：TM76[电气工程—电力系统及自动化]