一种光伏并网逆变器的双滞环SVPWM控制新算法  

A Novel Double Hysteresis Loop SVPWM Control Algorithm for PV Grid-Connected Inverter

作　　者：唐志涛[1] 龚仁喜[1] 杨江宁[1] 黄冬梅[1] 

机构地区：[1]广西大学电气工程学院,南宁530004

出　　处：《电测与仪表》2014年第3期37-41,共5页Electrical Measurement & Instrumentation

基　　金：广西自然科学基金资助项目(2010GXNSFA013023)

摘　　要：逆变器作为系统能量转换与控制的核心,其电流的控制设计至关重要。提出了一种改进的光伏并网逆变器双滞环电压空间矢量电流控制新算法。外环利用离散控制和无差拍控制原理,并在稳态和暂态时分别用2种不同的观测器模型预测指令电流,采用矢量合成控制算法。内环则利用逆变器输出电压及误差电流来判断参考电压矢量位置区域,选择最优电压空间矢量,直接在复平面上实施控制。结果表明,该算法不仅提高了电流动态响应速度,而且有效限制了误差电流,显著降低了逆变器的开关损耗。仿真和实验验证了该算法的有效性。The inverter is the core of the energy conversion and control of PV grid-connected system with the design of its current control as a prime importance. An improved algorithm of dual-hysteresis space-vector current control meth- od for a three-phase PV grid-connected inverter is proposed. In the algorithm, the outer loop adoptes the vector syn- thesis algorithm and the principles of discrete control and deadbeat control to predict the instruction current in steady and transient states respectively by two different kinds of observatory models, and its control is directly made on a -fl complex-plane by choosing the optimal voltage space vector and the output voltage and error current of the inverter to determine the region of the reference voltage vector in the inner loop. The results obtained show that the algorithm can not only improve the dynamic responding speed, but also suppress the error current and reduce the loss of the switches remarkably. Simulations and experimental results have verified the effectiveness of the algorithm.

关 键 词：三相光伏并网逆变器 双滞环 空间矢量 离散控制 

分 类 号：TM464[电气工程—电器]