H6型单相光伏并网逆变器并网电流的改善  

Improvement of grid-connected current of H6 topology single-phase photovoltaic grid-connected inverter

作　　者：王春宁 杨艳 李晓康 廖红华 Wang Chunning;Yang Yan;Li Xiaokang;Liao Honghua(School of Electrical Engineering,Qingdao University,Qingdao 266071,Shandong,China;School of Information Engineering,Hubei University for Nationalities,Enshi 445000,Hubei,China)

机构地区：[1]青岛大学电气工程学院,山东青岛266071 [2]湖北民族学院信息工程学院,湖北恩施445000

出　　处：《电测与仪表》2019年第16期116-122,共7页Electrical Measurement & Instrumentation

基　　金：国家自然科学基金资助项目(61463014; 61263030)

摘　　要：并网逆变输出功率的二倍频脉动,使得非隔离单相光伏并网逆变系统前级解耦电容电压出现了二次电压纹波,进一步使得以电压外环和电流内环控制的逆变器并网电流参考值存在三次谐波。为有效地抑制并网电流的三次谐波,从母线电压角度出发,把采集到的电压值进行处理。提出了一种直流母线二次纹波电压的补偿方法,该方法能够显著改善并网电流质量,对并网电流三次谐波有较好地抑制作用。最后,通过仿真和实验结果证明了提出的补偿方法的有效性。Due to the double-frequency pulsation of the output power of the grid-connected inverter,a secondary voltage ripple appears in the voltage of the decoupling capacitor at the front stage of the non-isolated single-phase photovoltaic grid-connected inverter system,which further controls the voltage outer loop and the current inner loop.The third harmonic of the reference value of grid-connected inverter current exists.In order to effectively suppress the third harmonic of the grid-connected current,the collected voltage values are processed from the bus voltage point of view.This paper presents a method to compensate the secondary ripple voltage of DC bus.This method can significantly improve the quality of grid-connected current,and it can effectively suppress the third harmonic of grid-connected current.Finally,the effectiveness of the proposed compensation method is proved by simulation and experimental results.

关 键 词：漏电流 准比例谐振 母线纹波电压 三次谐波电流 纹波电压补偿 

分 类 号：TM464[电气工程—电器]