摘要
死区效应广泛存在于电力电子开关器件控制中,死区时间的存在不仅影响了输出电压的准确度和输出电流的谐波特性,在有些系统中还会导致系统出现不稳定的状况。该文针对逆变器的死区效应进行详细分析,综合考虑开关管的死区时间、开关延时、通断损耗等问题对输出电压和电流的影响,提出一种脉冲式的死区补偿方法。不同于传统意义上的死区补偿方案,该补偿方法针对每个开关周期内的实际作用脉冲进行精确补偿。尤其在低速区域,在保证输出电压准确性的同时可降低输出电流谐波。最后,利用300kW大功率对拖电机平台进行验证,仿真和实验结果都证明了该补偿方案的可行性。
Dead-time effect exists in the control of power electronics devices widely.The existence of dead-time not only affects the accuracy of the output voltage and the harmonic characteristics of the output current,but also causes the instability of the system in some conditions.In this paper,the dead-time compensation of the inverter is analyzed in detail,and a pulse-based dead-time compensation method is proposed,considering the effects of dead time,switching delay and on-off loss on the output voltage and current.The compensation scheme is based on the judgment of the motor current direction,which is different from the traditional scheme of delay compensation only on the rising edge.The actual acting pulse in each switching cycle is compensated to ensure the accuracy of the output voltage while reducing the output current harmonics.Using the 300kW high power back-to-back motor platform to verify,the experimental results and simulation platform data prove the feasibility of the compensation scheme.
作者
倪瑞政
李庭
陈杰
刘志刚
Ni Ruizheng;Li Ting;Chen Jie;Liu Zhigang(School of Electrical Engineering,Beijing Jiaotong University,Beijing 100044,China;Beijing Engineering Research Center of Electrical Rail Transit,Beijing 100044,China)
出处
《电工技术学报》
EI
CSCD
北大核心
2019年第S02期553-559,共7页
Transactions of China Electrotechnical Society
基金
中央高校基本科研业务费专项资金资助(2018YJS163)。
关键词
死区效应
通断损耗
电流谐波
脉冲宽度调制
Dead-time effect
loss of opening and closing
current harmonic
pulse width modulation
