适用于弱交流系统的MMC-HVDC模型预测控制策略  

Model predictive control strategy of MMC-HVDC suitable for weak AC system

作　　者：陈奕新 王志新[1] 林环城 严胜 王承民[1] CHEN Yixin;WANG Zhixin;LIN Huancheng;YAN Sheng;WANG Chengmin(School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;State Grid Corporation of China,Beijing 100031,China)

机构地区：[1]上海交通大学电子信息与电气工程学院,上海200240 [2]国家电网有限公司,北京100031

出　　处：《电力自动化设备》2020年第1期80-86,共7页Electric Power Automation Equipment

基　　金：国家重点研发计划项目(2018YFB0904600);国家电网公司总部科技项目(未来电网形态研究及其演进路线)(B3440818K010);上海市科委技术标准专项(18DZ2205700)~~

摘　　要：基于虚拟同步发电机的模块化多电平变流器(MMC)控制策略参数设计复杂,响应速度缓慢。提出一种适用于弱交流系统的基于MMC的柔性高压直流输电(MMC-HVDC)模型预测控制策略,采用电压预测滚动优化和参考轨迹柔化技术,提高模型预测控制精度,降低器件开关频率并改善系统暂态响应性能。同时,通过在外环控制引入有功调频、无功调压控制,在内环控制引入直接电压预测控制,使得MMC能够有效参与受端电网频率调节,并保持有功、无功解耦控制。最后,通过MATLAB/Simulink平台进行仿真验证,仿真结果表明所提控制策略可以有效改善输出电能质量,降低开关频率,减小开关损耗,提高暂态响应速度,为弱交流系统提供更好的频率支撑特性。Thecontrol strategies of MMC(Modular Multilevel Converter)based on virtual synchronous generator need complex parameter design and have slow response speed.A model predictive control strategy of MMC-HVDC suitable for weak AC systems is proposed,using rolling optimization of voltage prediction and reference track smoothing techniques to improve the prediction accuracy,reduce the switching frequency of devices and improve the transient characteristics of the system.At the same time,by introducing active power regulation via frequency and reactive power regulation via voltage into the outer loop control,and direct voltage predictive control into the inner loop control,MMC can provide efficient frequency support to the grid and maintain active and reactive power decoupling control.With MATLAB/Simulink platform,the simulative results show that the proposed control strategy can effectively improve the output power quality,reduce the switching frequency and the switching loss,improve the transient response speed,and provide better frequency support characteristics for weak AC systems.

关 键 词：模型预测控制 模块化多电平变流器 弱交流系统 滚动优化 参考轨迹柔化技术 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM46