一种单级式高频隔离光伏并网逆变器及其调制方法  

A SINGLE STAGE HIGH FREQUENCY ISOLATED PHOTOVOLTAIC GRID-CONNECTED INVERTER AND ITS MODULATION METHOD

作　　者：朱文杰 曹晓雅 李学武 李云飞 周克亮 周翔 Zhu Wenjie;Cao Xiaoya;Li Xuewu;Li Yunfei;Zhou Keliang;Zhou Xiang(School of Information and Control Engineering,Qingdao University of Technology,Qingdao 266525,China;School of automation,Wuhan University of Technology,Wuhan 430070,China;State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]青岛理工大学信息与控制工程学院,青岛266525 [2]武汉理工大学自动化学院,武汉430070 [3]电力设备电气绝缘国家重点实验室(西安交通大学),西安710049

出　　处：《太阳能学报》2024年第7期474-485,共12页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(61673305);山东省高等学校科研计划(J15LN37);山东省自然科学基金(ZR2023ME138);台达电力电子科教发展计划。

摘　　要：针对光伏并网系统中可实现双向功率流的单级式高频隔离逆变器,提出一种调制方法,结合电压钳位技术,解决了传统高频隔离光伏并网逆变器变压器二次侧的电压尖峰和振荡问题。该逆变器为两级功率变换,对其工作过程及原理进行详细分析,建立等效电路模型,并推导出该逆变器的数学模型。为弥补传统多谐振控制器的不足,研究一种针对单级式高频隔离光伏并网逆变器的相位补偿的多谐振控制器,在单级式结构中完成最大功率点跟踪(MPPT)和对并网电流的精确控制。最后对所提高频隔离光伏并网逆变器的调制方法及其控制策略进行实验验证。A modulation method is proposed for a single-stage high frequency isolated inverter that can realize bidirectional power flow in grid-connected photovoltaic systems.The proposed modulation method and the voltage clamp technique are used to eliminate the secondary-side voltage spikes and oscillations of the transformer of the traditional high frequency isolated photovoltaic grid-connected inverter.The inverter is a two-stage power converter.Its operating process and principle are analyzed in detail,the equivalent circuit model is established,and the mathematical model of the inverter is derived.In order to overcome the shortcomings of traditional multi-resonant controller,a phase compensation multi-resonant controller is developed for the single stage high-frequency isolated photovoltaic grid-connected inverter.Maximum power point tracking(MPPT)and accurate control of grid-connected current are achieved in a single stage structure.Finally,the modulation method and control strategy of the single-stage high frequency isolation photovoltaic grid-connected inverter are verified through experiments.

关 键 词：光伏发电 最大功率点跟踪 逆变器 单级式 相位补偿 多谐振控制 

分 类 号：TM464[电气工程—电器]