级联模块化光伏电力电子变压器控制策略研究  

Research on the Control Strategy for Cascaded Modular Photovoltaic Power Electronic Transformer

作　　者：王新宇 赵涛 庄富帅 徐君[1] WANG Xin-yu;ZHAO Tao;ZHUANG Fu-shuai;XU Jun(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]合肥工业大学,安徽合肥230009

出　　处：《电力电子技术》2020年第3期83-85,共3页Power Electronics

基　　金：国家重点研发计划(2018YFB15007004)。

摘　　要：基于级联H桥(CHB)拓扑的光伏电力电子变压器(PET)具有模块化结构以及无工频变压器直接与中压电网连接等优点,在高压大功率光伏发电应用中有很大优势。结合其特点,提出适用于光伏PET的控制策略,不仅能够实现对电网电流、H桥直流母线电压、公共直流母线电压以及模块间功率均衡的控制,而且性能较好。通过实验结果验证了所提控制方法的有效性。The cascaded H-bridge(CHB) based photovoltaic power electronic transformer(PET) has the characteristics of expandable modular structure and no need for bulky line-frequency transformer.PET could directly connect with medium voltage grid.It has great advantages in high-voltage and high-power applications.Based on its characteristics,a control strategy for photovoltaic PET is proposed,which can not only achieve the control of grid currents,the H-bridge DC-bus voltages,common DC-bus voltage and power balance among modules,but also have a good performance.Through experimental results verify the effectiveness and feasibility of the proposed control method.

关 键 词：电力电子变压器 级联H桥 光伏发电 控制策略 

分 类 号：TM41[电气工程—电器]