不平衡及谐波电网电压下并网逆变器的直接功率控制策略  

Direct Power Control Strategy of Grid Connected Inverter Under Unbalanced and Harmonic Grid Voltage

作　　者：年珩[1] 沈永波[1] 宋亦鹏[1] 

机构地区：[1]浙江大学电气工程学院,浙江省杭州市310027

出　　处：《电网技术》2014年第6期1452-1458,共7页Power System Technology

基　　金：国家863高技术基金项目(2011AA050204)~~

摘　　要：为提高并网逆变器对电网的适应能力,提出了不平衡及谐波电网电压下并网逆变器的直接功率控制策略。建立了同步旋转坐标系下的并网逆变器数学模型;以输出有功和无功功率平稳或输出电流三相平衡且波形正弦为控制目标,在传统直接功率控制基础上引入矢量比例积分(vector proportional integrator,VPI)谐振控制器以抑制功率或者电流的波动;分析了VPI谐振调节器的参数设计规律及不同控制目标下所提策略的控制性能。实验结果验证了所提策略的有效性。In order to enhance the adaptive capability of the grid connected inverter,the paper proposed the direct power control （DPC） strategy of the grid connected inverter under the unbalanced and harmonic grid voltage.The mathematic model of the grid connected inverter under synchronous reference frame is built.To implement two different control target of smooth active and reactive power or balanced and sinusoidal current,the vector proportional integral resonant regulator is integrated with the traditional DPC to suppress the ripple of the power or current.And then,the design principle of VPI parameter is investigated and the control capability of the proposed DPC strategy on the alternative control target is analyzed.Finally,the experimental results validated the availability of the proposed DPC strategy.

关 键 词：不平衡及谐波电网电压 并网逆变器 直接功率控制 矢量比例积分谐振调节器 功率平稳 

分 类 号：TM721[电气工程—电力系统及自动化]