含LC低通滤波器的VSC-HVDC系统的新型控制策略  

Control strategy for VSC-HVDC system with LC low-pass filter

作　　者：黄崇鑫[1] 张凯锋[1] 戴先中[1] 张冠虎[1] 

机构地区：[1]东南大学自动化学院复杂工程系统测量与控制教育部重点实验室,江苏南京210096

出　　处：《电力自动化设备》2011年第3期12-17,共6页Electric Power Automation Equipment

基　　金：国家自然科学基金项目(50507002;60974036);教育部博士点基金项目(20090092110020)~~

摘　　要：通过引入LC低通滤波器来滤除逆变器产生的高次电压谐波,以提高向无源网络供电的VSC-HVDC系统的供电质量。在同步旋转坐标系下,包含LC低通滤波器的VSC-HVDC系统表现出强耦合、非线性特性,不利于控制器设计。首先采用逆系统方法将原系统线性化解耦成伪线性系统,再利用变结构控制理论设计伪线性系统的闭环控制器,既可以降低设计控制系统的难度,又可以使控制系统获得较好的动态性能。利用PSCAD/EMTDC进行仿真试验。仿真结果表明,LC低通滤波器用于滤除高次电压谐波有很好的滤波效果,并且所采用的控制策略使VSC-HVDC系统获得了良好的控制性能。In order to improve the quality of power fed by VSC-HVDC（High Voltage Direct Current transmission based on Voltage Source Converter） system to passive network,a LC low-pass filter is employed to eliminate the high-order voltage harmonics generated by the inverter.The strong coupling and nonlinearity of VSC-HVDC system with the LC filter in the synchronous rotating frame brings difficulty to the design of its controller.The inverse system method is adopted to convert it into a pseudo linear and decoupled system and the variable structure control is used to design its close-loop controllers,which lowers the design difficulty and improves the dynamic performance of VSC-HVDC control system.Simulation is carried out with PSCAD/EMTDC and the simulative results indicate that,the LC low-pass filter eliminates the high-order voltage harmonics effectively and the VSC-HVDC system with the proposed control strategy achieves excellent control performance.

关 键 词：电压源型高压直流输电 LC低通滤波器 逆系统方法 变结构控制 

分 类 号：TM721.3[电气工程—电力系统及自动化]