摘要
针对三相三电平Vienna整流器存在的固有中点电压波动问题,提出将直流侧中点电压偏差引入滞环电流闭环控制中,通过调节指令电流的直流偏移量实现直流侧中点电压平衡控制。结合等效电路分析了Vienna整流器滞环电流工作原理,设计了电压外环控制器,并给出了滞环宽度和中性点补偿系数的选取依据。最后搭建了一台Vienna整流器样机对该方案进行了验证,实验结果验证了该方案的可行性。
In allusion to inherent neutral point potential voltage fluctuation in three-phase three-level Vienna rectifier,it is pointed out to lead the neutral point voltage deviation at DC side into the hysteresis current control to implement the balance control of neutral point voltage at DC side via adjusting the DC offset of reference current.According to its equivalent circuit,the working principle of hysteresis current control for Vienna rectifier is analyzed and an outer-loop voltage controller is designed,and the foundation to choose the hysteresis width and the compensation coefficient of neutral point is given.Finally,a prototype of Vienna rectifier is constructed to validate the proposed hysteresis current control method,and experimental results show that the proposed control method not only possesses good static and dynamic performances as well as satisfactory neutral point voltage balancing characteristics,but also can make the Vienna rectifier having satisfactory grid-side performance.
出处
《电网技术》
EI
CSCD
北大核心
2013年第7期1909-1914,共6页
Power System Technology
基金
高等学校博士学科点专项科研基金资助项目(20126118120009)
陕西省重点学科建设专项资金资助项目(105-5X1201)
陕西省教育厅专项科研计划项目(12JK0562)
西安理工大学博士启动基金资助项目(105-211104)的资助~~
关键词
VIENNA整流器
滞环电流控制
中点电位平衡控制
Vienna rectifier
hysteresis current control
neutral point potential balancing control
