单相级联H桥光伏逆变器的方波补偿控制策略  

Square Wave Compensation Control Strategy of Single-phase Cascaded H-bridge Photovoltaic Inverter

作　　者：王新宇 徐君[1] 赵涛[2] 庄园 WANG Xin-yu;XU Jun;ZHAO Tao;ZHUANG Yuan(Sungrow Power Supply Co.,Ltd.,Hefei 230088,China;不详)

机构地区：[1]阳光电源股份有限公司,安徽合肥230088 [2]青岛大学,山东青岛266071

出　　处：《电力电子技术》2022年第4期83-85,122,共4页Power Electronics

基　　金：国家重点研发计划(2018YFB15007004)。

摘　　要：功率不平衡是单相级联H桥(CHB)光伏并网逆变器固有的问题,会引起输出功率较大的光伏组件对应的H桥(HB)变换器过调制,导致电网电流性能变差甚至系统不能正常运行。为此,提出一种扩大单相CHB光伏并网逆变器运行范围的方波补偿控制策略,当HB变换器之间的传输功率不平衡时,系统依然能够单位功率因数稳定运行。实验结果验证了所提控制策略的有效性。Power imbalance is an inherent problem of single-phase cascaded H-bridge(CHB)photovoltaic grid-connected inverter which will cause overmodulation of H-bridge(HB)connected to the photovoltaic module with larger output power resulting in poor grid current performance and even abnormal operation of the system.To deal with this issue,a square wave compensation control strategy is proposed to expand the operation range of single-phase CHB photovoltaic grid-tied inverter.When the transmission powers among HB converters are unbalanced,the system can still operate stably with unit power factor.Effectiveness of the proposed control strategy is verified by experimental results.

关 键 词：光伏逆变器 单位功率因数 方波补偿 

分 类 号：TM464[电气工程—电器]