摘要
模块化多电平矩阵变换器M3C(modular multilevel matrix converter)是一种可以实现直接三相交-交变换的多电平拓扑,在大功率、中高压的电力传输或者电机牵引领域有着广阔的应用前景,但M3C变换器包含9个桥臂,模块数目众多,直接控制困难,传统控制系统的设计方法难以适用。因此,首先从双αβ0解耦变换出发,推导了M3C交流侧解耦模型和直流侧方程,并以此为基础提出了一种改进的电容电压平衡策略,以简化控制器设计,减小控制误差。然后分别给出了总电容电压和桥臂间电容电压平衡的控制方法,着重阐述通过控制环流注入改变桥臂功率的直流项,进而补偿电容电压直流偏置,并推导了环流参考的表达式。最后仿真模型和实验结果均验证了所提方法的有效性。
As a multilevel topology which can realize direct three-phase AC/AC transformation,the modular multi level matrix converter(M3C)has shown great application potential in fields such as high power and high/medium voltage electricity transmission and motor drive.However,due to the existence of nine arms and a large number of submodules,M3C is difficult to control directly,and the conventional design method for control system is not suitable.According to the doubleαβ0 transformation,the decoupling model of M3C on AC side and the equation on DC side are derived in this paper.On this basis,an improved capacitor voltage balancing strategy is proposed,which can simplify the controller design and reduce the control error.The methods of overall capacitor voltage control and arm capacitor voltage balancing are given,respectively.Specifically,the DC term in the arm power changed through injecting circulating current is elaborated upon,which can further compensate the capacitor voltage DC deviation.In addition,the expressions of circulating current reference are also deduced.Finally,both the simulation and experimental results verified the effectiveness of the proposed method.
作者
吴争
刘健
杨晓梅
吉宇
徐晓轶
姚文熙
WU Zheng;LIU Jian;YANG Xiaomei;JI Yu;XU Xiaoyi;YAO Wenxi(State Grid Jiangsu Electric Power Co.,Ltd,Nanjing 210029,China;College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)
出处
《电源学报》
CSCD
北大核心
2022年第2期108-114,共7页
Journal of Power Supply
基金
国家重点研发计划资助项目(2017YFB0903300)。
关键词
模块化多电平矩阵变换器
交交变换器
双αβ0变换
电容电压平衡
环流控制
modular multilevel matrix converter(M3C)
AC/AC converter
doubleαβ0 transformation
capacitor voltage balancing
circulating current control
