3电平VSC-HVDC系统模型预测控制策略  

Model Predictive Control Strategy of Three-level VSC-HVDC

作　　者：谭国俊[1] 曹晓冬[1] 王从刚[1] 李浩[1] 

机构地区：[1]中国矿业大学信息与电气工程学院,徐州221008

出　　处：《高电压技术》2013年第11期2737-2742,共6页High Voltage Engineering

基　　金：江苏省普通高校研究生科研创新计划(CXZZ13_0930)~~

摘　　要：为提高现有电压源换流器型高压直流(VSC-HVDC)输电系统运行性能,提出了一种3电平VSC-HVDC系统模型预测控制(model predictive control,MPC)方案。该方案采用遍历法预测所有开关状态对应的换流器未来系统状态,选择使目标函数最优的开关状态,并将该最优开关状态作用于实际换流器系统。为了减少开关损耗需要降低开关器件动作频率,为此在目标函数中引入降低开关频率目标项,在兼顾控制性能的同时有效地降低开关器件动作频率。与传统电压定向控制策略相比,所提控制策略具有动态响应迅速、处理多目标控制灵活且无需调制模块等优势,这些优势在基于Matlab/Simulink软件进行的仿真中也得以验证。To improve the performance of existing voltage-source converter high-voltage direct-current （VSC- HVDC） transmission system, a model predictive control （MPC） strategy for three-level VSC-HVDC systems is proposed. The strategy is comprised of predicting the system＇s future output of all switching states using the traversing method and electing an optimal switching state for the cost function which will be applied to the converter. For reducing the energy loss from switching devices, the switching frequency of the devices must be reduced, so a control target is designed in the cost function, which can realize the coordination between control performance and switching frequency. Compared with traditional voltage oriented control strategies, the proposed strategy prevails with better dynamic response, greater flexibility in dealing with multi-objective online optimization problems and requiring no modulation module, and this is verified by simulations in Matlab/Simulink.

关 键 词：VSC—HVDC 模型预测控制 直接功率控制 开关频率 目标函数 动态性能 

分 类 号：TM721.1[电气工程—电力系统及自动化]