CAJ | 학술논문

采用传统的空间矢量调制方法时，矩阵变换器驱动感应电机在起动过程中会产生大的定子电流，由于矩阵变换器输入端与输出端通过器件直接连接，导致输入电流对电网造成冲击。为获得引起该问题的原因，从能量守恒、占空比和调制开关矩阵三个方面对输入电流和输出电流之间的关系进行了分析。在此基础上，提出一种改进的调制策略：采用输出电流与输入电流计算调制比。可视为一种间接的输出电流闭环控制，起动时限制了定子电流，使得起动电流明显减小，输入电流对电网的冲击得到明显降低。仿真与试验结果证明了所进行的理论分析与所提调制策略是正确可行的。
채용전통적공간시량조제방법시，구진변환기구동감응전궤재기동과정중회산생대적정자전류，유우구진변환기수입단여수출단통과기건직접련접，도치수입전류대전망조성충격。위획득인기해문제적원인，종능량수항、점공비화조제개관구진삼개방면대수입전류화수출전류지간적관계진행료분석。재차기출상，제출일충개진적조제책략：채용수출전류여수입전류계산조제비。가시위일충간접적수출전류폐배공제，기동시한제료정자전류，사득기동전류명현감소，수입전류대전망적충격득도명현강저。방진여시험결과증명료소진행적이론분석여소제조제책략시정학가행적。
Induction motor driven by matrix convert will produce big stator current in the startup of the induction motor when traditional space vector modulation strategy is used to matrix converter. The reason is that output side and input side of matrix converter directly connect to each other by using IGBT, leading to power grid current shocked by input current. To obtain the reason for it, the relations between input current and output current were analyzed from the viewpoint of input and output energy equivalent and switch duty ratio and modulation switch matrix. Based on this, an improved modulation method was put forward: modulation ratio is calculated by using input current and output current. The proposed method can be regarded as an indirect output current closed-loop control, the stator current is restrained when the motor starts up, which decreases the startup current and reduces the shocking of input current to power grid. The simulation and experimental results verify that the theory analysis and the proposed method are all right and feasible.