基于功率控制的级联SST整流均压策略研究  

Research on Voltage Balance Control Strategy of Cascaded SST Rectifier Based on Power Control

作　　者：缪卫东 李俊 孙晓通 MIAO Weidong;LI Jun;SUN Xiaotong(College of Electrical Engineering and Control Science,Nanjing Tech University,Nanjing 211816,Jiangsu,China)

机构地区：[1]南京工业大学电气工程与控制科学学院,江苏南京211816

出　　处：《电气传动》2020年第11期28-33,共6页Electric Drive

摘　　要：级联固态变压器能突破单个开关管耐压的局限性,提高系统的电压等级,在电能转换和输电方面应用前景广泛。针对其整流级各个模块因负载差异引起的直流侧电压失衡问题,通过虚拟正交变换,构造系统在旋转坐标系下的离散模型,实现系统的直接功率控制,求取各H桥共同的有功、无功占空比。同时分析了引起电压失衡的原因,提出了在共同占空比的基础上,各模块叠加各自的有功占空比补偿值,生成各自的调制波,再经过载波移相调制达到均压目的的策略。最后通过仿真和实验平台的搭建,验证了所提控制策略的可行性和有效性。Cascaded solid-state transformer(SST)can overcome the limitations of single switching device withstand voltage,and improve the voltage level of the system,so it has broad application prospects in power conversion and transmission.Aiming at the DC-side voltage imbalance caused by the load difference of each module in the cascade rectifier stage,the system's discrete model in the rotating coordinate system was constructed by virtual orthogonal transformation to realize the direct power control of the system,the common active and reactive duty cycles to each H-bridge were got.The essence of the voltage imbalance in this system was also analyzed.It was proposed that each module superimposes its own active duty cycle compensation values on the basis of the common duty cycle to generate the respective modulated waves,and voltage balance can be achieved after carrier phase shift modulation.Finally,the simulation model and platform were built to verify the effectiveness of the proposed control strategy.

关 键 词：固态变压器 均压 直接功率控制 载波移相 

分 类 号：TM461[电气工程—电器]