基于滤波器的有源阻尼控制的LCL型光伏并网逆变器  

Active Damping Control of Single-Phase Grid-Connected Photovoltaic Inverter Based on Filter

作　　者：张宁云[1] 唐厚君[1] 姚辰[1] 

机构地区：[1]上海交通大学电子信息与电气工程学院,国家能源智能电网研发中心,上海200240

出　　处：《上海交通大学学报》2015年第4期429-435,441,共8页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金资助项目(51277120)

摘　　要：依据LCL型光伏并网逆变器离散域数学模型,从采样频率与LCL滤波器谐振频率之间的关系入手,讨论了小于、等于以及大于临界采样频率的不同频段内系统的稳定性.深入分析在不同的采样频率下,LCL型并网逆变系统产生不稳定的因素,并指出改造系统特性的方法.引入2种不同的数字滤波器分别与比例谐振(PR)控制器构成复合控制器,分别从系统幅值和相位两方面改造系统特性,使整个并网系统在不同的采样频率下保持稳定.仿真与实验结果验证了本文分析结论的正确性.Based on the mathematical model of the single-phase grid-connected inverter with LCL filter in discrete domain, the stability of the whole system was deeply investigated, considering the relationship between the sampling frequency and the resonant frequency of the LCL filter. The reason for the instability of the sampling frequency which is less than, equal to, and higher than the critical frequency, is discussed. The methods to reform the characteristics of the system were proposed. Two different digital filters were introduced to construct composite controller with the proportional resonant（PR） controller, and the sys- tem characteristics from the amplitude and phase was reformed respectively, making the whole system stable under low, medium and high sampling frequency with the composite controller. The validity of the analysis was assessed by both the numerical simulation and experimental results.

关 键 词：并网逆变器 LCL滤波器 复合控制器 稳定性分析 

分 类 号：TM464[电气工程—电器]