基于DPC的海上风场VSC-HVDC变流器控制策略  

DPC-based control strategy of VSC-HVDC converter for offshore wind farm

作　　者：王国强[1] 王志新[1] 张华强[1] 郑健[2] 杨兴武[1] 邵峥达[3] 

机构地区：[1]上海交通大学电气工程系,上海200240 [2]上海市电力公司沪南供电分公司,上海200407 [3]上海市电力公司检修公司,上海200072

出　　处：《电力自动化设备》2011年第7期115-119,共5页Electric Power Automation Equipment

基　　金：国家自然科学基金重点资助项目(60934005);中国博士后基金项目(20080440088);上海市博士后基金项目(08R214134);上海市科技发展基金项目(09195802900);上海市白玉兰科技人才基金项目(2009B075)~~

摘　　要：针对海上风场并网电压源直流输电系统,设计了基于虚拟磁链的直接功率控制(DPC)方法,通过虚拟磁链技术计算系统功率,省去了电压传感器和锁相环,实现了无交流电压传感器运行,提高了系统可靠性,降低了成本。同时,针对常规DPC的功率滞环造成变流器开关频率变化范围大、系统滤波器设计困难及对处理器运算速度要求高等不足,利用三相电压源变流器的虚拟磁链模型和功率模型估计磁链和功率,通过功率误差直接计算电压参考信号,生成SPWM调制波,既替代滞环控制又避免内环PI调节器参数的整定。利用Matlab/Simulink搭建相应的仿真模型,结果表明两端变流器均可无交流电压传感器运行,需调整参数较少,且具有较快的响应速度和稳态跟踪精度,因此所设计系统正确有效。DPC（Direct Power Control） is designed for the grid-connected VSC-HVDC system of offshore wind farm,which applies the virtual flux technology to calculate the system power.The AC voltage sensors and PLL are saved to increase system reliability and decrease cost.The power and virtual flux models of three-phase VSC are constructed to estimate flux and power.The voltage reference signal is directly calculated according to the error of power,and the SPWM wave is generated to replace the hysteresis control and avoid the PI parameter adjustment of internal control loop.The results of simulation with Matlab/Simulink indicate that,the converters at both sides can operate without AC voltage sensors,and the system needs less parameter adjustment and has fast response speed and high steady-state tracking accuracy.

关 键 词：直接功率控制 磁链 调制 正弦脉宽调制 高压直流输电 风电 海上电厂 仿真 

分 类 号：TM721.1[电气工程—电力系统及自动化]