摘要
提出三电平三相四桥臂有源电力滤波器(APF)矢量模式单周控制策略。基于三电平三相四桥臂APF等效开关模型和开关函数的定义,得到该拓扑的有效绝对开关状态表,同时对1个工频周期进行12等份,在每个30°区间对应绝对开关状态表,首先选择出该区间内第4桥臂的开关状态,然后再根据电压大小设定其他桥臂开关状态,以实现将开关模型等效成3-Boost结构,最后建立控制模型得到控制目标方程。依据控制目标方程对三电平三相四桥臂APF进行了仿真和实验研究,研究结果表明基于该控制策略的四桥臂APF能有效地补偿系统谐波和无功电流,补偿性能好,验证了所提控制策略的可行性和有效性。
A vector mode one-cycle control strategy of three-level three-phase four-leg APF（Active Power Filter） is presented.Based on its equivalent switching model and switching function definition,its effective absolute switching status table is obtained.The control cycle is divided into twelve equal sections.The switching status of the fourth leg is selected according to the status table for each section（30°） and the switching status of other legs are set according to the voltage to make the witching model equivalent to 3-Boost structure.The control model is established to deduce the control object equation,based on which the simulation and experiment are carried out.Results show that the four-leg APF based on the proposed control strategy compensates the harmonic and reactive currents commendably and effectively,which verifies its feasibility and validity.
出处
《电力自动化设备》
EI
CSCD
北大核心
2010年第7期74-79,共6页
Electric Power Automation Equipment
