三电平变流器中点波动和死区效应优化策略  

An Optimization Strategy for the Three-level Converter Neutral Point Fluctuation and Dead-time Effect

作　　者：骆俊宇 吴超[1] 王勇[1] LUO Jun-yu;WU Chao;WANG Yong(Shanghai Jiao Tong University,Key Laboratory of Control of Power Transmission and Conversion,Ministry of Education,Shanghai 200240,China)

机构地区：[1]上海交通大学,电力传输与功率变换控制教育部重点实验室,上海200240

出　　处：《电力电子技术》2023年第6期116-119,共4页Power Electronics

摘　　要：正弦脉宽调制(SPWM)由于简单易操作而被广泛运用于三电平变流器,但是针对三电平变流器的中点平衡问题,采用常规SPWM方法无法消除中点电压的低频脉动。所以在此首先建立中点电压波动的数学模型,凝练出中点电压波动和中点电流的关系,结合中点电压低频脉动消除原理和死区效应消除原理,提出一种四调制波策略。与传统SPWM方式相比,不仅有效消除了三电平变流器中点电压的低频脉动,而且还提高了变流器输出电流波形质量,并通过实验结果验证了理论分析的正确性和该方法的有效性。Sinusoidal pulse width modulation(SPWM)is widely used in three-level converters because of its simplicity and ease of operation.However,for the neutral point balance problem of three-level converters,the low-frequency oscillation of the neutral point voltage can not be eliminated if the conventional SPWM method is adopted.Therefore,it firstly establishes the mathematical model of neutral point voltage fluctuation,condenses the relationship between neutral point voltage fluctuation and neutral point current,and proposes a four-modulation-wave strategy based on the principle of neutral point voltage low-frequency oscillation elimination and the principle of dead-time effect elimination.Compared with the traditional SPWM method,it not only effectively eliminates the low-frequency oscillation of the neutral point voltage of the three-level converter,but also improves the quality of the output current waveform of the converter.The correctness of the theoretical analysis and the effectiveness of the method are both verified by experimental results.

关 键 词：三电平变流器 中点电压波动 死区效应 四调制波 

分 类 号：TM46[电气工程—电器]