摘要
Delta-Sigma调制(DSM)可在无需随机过程统计特性和复杂谐波理论分析的基础上,依托其过采样特性实现电力电子变换器变频调制。双级矩阵变换器(TSMC)作为一种理想的“全硅”交-交变换器,若能够将DSM引入TSMC,可进一步优化其电磁干扰(EMI)水平和运行效率,但TSMC的直流链电压波动问题导致TSMC-DSM策略难以直接实现。针对TSMC-DSM实现问题,该文提出一种基于参考电压修正的DSM策略。在所提方法中,通过解析TSMC整流级调制过程,将逆变级参考电压按照整流级矢量作用顺序进行修正,并依次获得各扇区参考电压修正系数。最后,在两相坐标系下分别构建两个DSM调制器,并将修正后的逆变级电压参考值引入DSM调制器以实现高性能TSMC-DSM策略。实验结果表明,所提策略能够对输出电压、电流频谱进行合理整形以减少系统对外部的电磁干扰,同时具备优良的电压传输比和动态调制性能。
A two-stage matrix converter(TSMC)has the advantages of a conventional matrix converter,such as no DC-bus capacitance,flexible energy control,and a compact structure.Moreover,it simplifies the modulation process while avoiding the complex four-step commutation mechanism of direct matrix converters,becoming a potential power electronics topology.Currently,the voltage transfer ratio of TSMC using the classical method cannot exceed 0.866,and the electromagnetic noise caused by voltage harmonic near the switching frequency is relatively concentrated.According to the specific mathematical laws,the spread spectrum modulation technology transforms PWM waveforms into irregular pulse sequences.It improves the voltage transfer ratio and expands the output voltage spectrum to a wider range,thereby reducing output harmonics and electromagnetic noise.However,TSMC has a large number of power switches,and its switching coordination between the rectifier and inverter stage is complex.There are still many key issues to be addressed in the spread spectrum modulation technology of TSMC.Considering the simple structure and without complex random statistical characteristics,Delta-Sigma modulation(DSM)can significantly optimize the output spectrum,reduce the EMI level,and optimize the operational efficiency of the power converter.However,the modulation strategy of TSMC can be divided into rectifier-stage algorithms and inverter-stage algorithms.The absence of a DC-link capacitor of TSMC leads to fluctuations in DC-link voltage.The DSM of the inverter stage cannot accurately quantify and track the fluctuation patterns of DC-link voltage,making it difficult for TSMC to directly implement DSM in the inverter stage.This paper proposes a DSM scheme with reference voltage correction(RVC-DSM).Firstly,the operation principle of DSM indicates that as the order L of DSM increases,the suppression effect on low-frequency harmonics of voltage is better,and the modulator resolution is significantly improved.Specifically,the DSM resolution is increa
作者
周湛清
谢琦坤
马朝磊
薛凌月
史婷娜
Zhou Zhanqing;Xie Qikun;Ma Chaolei;Xue Lingyue;Shi Tingna(National Joint Local Engineering Research Center of Electrical Machine System Intelligent Design and Manufacturing Tiangong University,Tianjin 300387 China;School of Electrical and Information Engineering Tianjin University,Tianjin 300072 China;College of Electrical Engineering Zhejiang University,Hangzhou 310027 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2024年第10期3070-3081,共12页
Transactions of China Electrotechnical Society
基金
国家自然科学基金资助项目(52377066,51777135,51907142)。
