基于滤波器的有源阻尼控制的LCL型光伏并网逆变器

上海交通大学学报（自然版） ›› 2015, Vol. 49 ›› Issue (04): 429-435.

基于滤波器的有源阻尼控制的LCL型光伏并网逆变器

张宁云,唐厚君,姚辰

（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）

收稿日期:2014-07-27 出版日期:2015-04-28 发布日期:2015-04-28
基金资助:
国家自然科学基金资助项目（51277120）

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

ZHANG Ningyun,TANG Houjun,YAO Chen

(School of Electronic Information and Electrical Engineering, State Energy Smart Grid (Shanghai) Research and Development Center, Shanghai Jiaotong University, Shanghai 200240, China)

Received:2014-07-27 Online:2015-04-28 Published:2015-04-28

摘要/Abstract

摘要：

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.

关键词: 并网逆变器, LCL滤波器, 复合控制器, 稳定性分析

Abstract:

Abstract： 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 system 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.

Key words: grid-connected inverter, LCL filter, composite controller, stability analysis

中图分类号:

TM 464

张宁云,唐厚君,姚辰. 基于滤波器的有源阻尼控制的LCL型光伏并网逆变器[J]. 上海交通大学学报（自然版）, 2015, 49(04): 429-435.

ZHANG Ningyun,TANG Houjun,YAO Chen. Active Damping Control of Single-Phase Grid-Connected Photovoltaic Inverter Based on Filter[J]. Journal of Shanghai Jiaotong University, 2015, 49(04): 429-435.

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