多源变换器空间矢量调制方法

Space vector modulation of multi-source converter

针对多源变换器构成的混合储能系统直流侧储能网络电压不平衡时引起的电流畸变问题,提出一种基于空间坐标分析的新型空间矢量调制方法。提出利用矢量空间坐标关系优化调制方法的扇区判断条件,解决现有正弦脉宽调制方法和空间矢量调制方法运算时间长,且无法全范围使用的问题。此外,对各电压矢量状态下变换器功率流动进行分析,结合不同矢量组对直流侧电流的影响,实现变换器对储能网络功率协调控制。为分析变换器直流侧功率协调特性,通过构建多源变换器稳态功率流动模型,给出多源变换器最佳工作区域,为系统控制策略优化提供目标。所提出的方法运算量小、鲁棒性高,仿真和实验结果都验证了所提出调制方法的正确性和可行性。

In view of the current distortion caused by the unbalanced DC voltage of the hybrid energy storage system based on multi-source converters,a space vector modulation method based on space coordinate analysis is proposed.It aims to optimize the sector judgment conditions and solve the problem that the existing sinusoidal pulse width modulation and space vector modulation have a long calculation time and cannot work full-range.In addition,the power flow of the converter in each vector was analyzed to obtain the effects of different vector groups on the DC current,and the power coordination of the DC energy storage network was realized.In order to analyze the coordination characteristics of the converter,by constructing a steady-state power flow model,the best working area of converter was given,which provides a goal for the optimization of the system control strategy.The proposed method has low computational complexity and high robustness.Both simulation and experimental results verified the correctness and feasibility of the proposed modulation method.