三相T型滤波并网逆变电源的网侧电流直接控制技术  

Direct Grid Current Control of the Three-Phase Grid-Connected Inverter Through T Filter

作　　者：胡雪峰[1,2] 龚春英[1] 陈新[1] 章家岩[2] 

机构地区：[1]南京航空航天大学航空电源重点实验室,南京210016 [2]安徽工业大学电力电子与运动控制省重点实验室,马鞍山243002

出　　处：《电工技术学报》2012年第1期9-16,共8页Transactions of China Electrotechnical Society

基　　金：国家重点基础研究发展计划(973计划)资助项目(2007CB210303)

摘　　要：并网逆变电源是新能源分布式发电、微型电网系统中的关键装置。为了利用较小的电感量就能获得低谐波含量的高质量馈网电流,通常在逆变电源与电网之间接入T型滤波器,然而,T型滤波网络为三阶无阻尼系统,易发生谐振。本文提出了基于同步旋转坐标系下的网侧电流反馈作为外环和基于同步旋转坐标的电容电流反馈作为内环的网侧电流直接控制策略,对该方案进行了系统建模和稳定性分析,研究了T型滤波网络与控制器参数之间的优化关系。通过仿真和实验验证,该控制策略既能使并网逆变电源输出电流的相位与电网电压相位完全一致,又可抑制系统振荡,增加系统稳定性,同时又具有良好的稳态和动态性能,保证了向公共电网输送的电能质量符合IEEE 929—2000标准要求。Grid-connected inverters play an important role in distributed generation systems and micro-grids,and T filters raise the importance for achieving low-distortion and high-quality power export from inverters with less inductance.However,grid-connected inverter system incorporating T filters is a third order system without damping and easy to resonate.A dual-loop control strategy based on synchronous frame is proposed in this paper,the strategy integrates an outer loop grid current regulator with inner capacitor current regulation,system modeling and stability analysis are presented.Simulation and experimental results verify the stability of the control strategy,and make the grid-connected inverter output current to be in phase with the grid voltage,The power quality into the grid is compliant with the IEEE 929-2000 standard,and the grid-inverter system has very good dynamic and static performance.

关 键 词：并网逆变器 T型滤波器 网侧电流 直接控制 高功率因数 

分 类 号：TM464[电气工程—电器]