新型双Buck非隔离并网逆变器无功补偿研究  

Reactive Power Compensation of the New Dual-Buck Transformerless Grid-connected Inverter

作　　者：谢勇[1] 方宇[1] 黄丽娟[1] 孙鹏[1] 

机构地区：[1]扬州大学,信息工程学院,江苏扬州225127

出　　处：《电力电子技术》2015年第6期77-79,共3页Power Electronics

基　　金：国家自然科学基金(61174046)~~

摘　　要：针对单相非隔离光伏并网逆变器在无功补偿时存在着并网电流在电网电压过零点处畸变的问题,提出一种新的调制策略,即工频开关管在正功部分采用有功调制,而在负功部分采用单极性调制,能较好地解决过零点畸变的问题。通过实验验证了该方法的有效件.并能满足VDE-AR-N4105认证要求。Aiming at the problem of current distortion at zero crossing when compensating the reactive power in singlephase transformerless inverter for grid-connected photovoltaic systems, a new modulation strategy is proposed in which the line-frequency switches uses active and unipolar modulation in positive and negative power respectively.The effec- tiveness of the proposed method is verified by experiment, and the results meet the standard VDE-AR-N4105.

关 键 词：逆变器 无功补偿 电流畸变 单极性调制 

分 类 号：TM464[电气工程—电器]