摘要
为克服由于开关器件容量小而导致有源电力滤波器(APF)功率受到限制的问题,提出了一种基于矢量模式单周控制的三相三线制三电平APF,APF主电路采用二极管箝位型三电平拓扑结构,控制策略采用0°～360°区间矢量模式单周控制,以减小APF开关应力和损耗,实现用低耐压开关器件提高APF功率等级。对所提出的APF等效开关模型和平均模型进行了分析,在此基础上推导出统一控制目标方程,根据此方程建立了系统仿真模型,并详细分析了系统稳定性和PI调节器设计。最后,分别对APF工作于三相电源平衡和不平衡时的情况进行了仿真研究,仿真结果表明所提出的APF能有效地补偿系统谐波和无功电流,提高输电线功率因数和传输效率,验证了所提出的控制方法的可行性和有效性。
To break the power limit of APF（Active Power Filter） caused by the smaller capability of switching devices,the three-phase three-wire three-level APF based on vector mode one-cycle control is presented. The diode- clamp three- level topology is used in its main circuit and the one -cycle control strategy of vector mode within 0°- 360° is employed to reduce APF switching stress and loss and to enhance APF power rating with low- voltage switching devices. The equivalent switching model and average model of proposed APF are analyzed and the unified control object equation is deduced,based on which the system simulation model is established. The system stability and PI regulator design are analyzed in detail. Simulations are carried out for both balanced and unbalanced three- phase power supply. Simulation results show that the proposed APF can compensate the system harmonics and reactive currents effectively and improve the power factor and transmission efficiency of transmission lines,which verify its feasibility and validity.
出处
《电力自动化设备》
EI
CSCD
北大核心
2008年第6期6-11,共6页
Electric Power Automation Equipment
关键词
三电平
三相三线制
有源电力滤波器
矢量模式
单周控制
three - level
three - phase three - wire
active power filter
vector mode
one - cyclecontrol
