摘要
采用LCL滤波器的三相电压源型脉宽调制(PWM)整流器广泛应用于中高功率场合,且可双向运行。基于坐标变换的直接电流控制方法具有控制精度高、调节速度快等优点,广泛应用于三相PWM整流器的控制。直接电流控制中的比例积分(PI)调节器会导致整流器启动瞬间产生过冲电流,使得功率器件承受较大的瞬时电流应力,影响系统的可靠性,故需研究三相整流器启动冲击的抑制方法。分析了三相电压源型PWM整流器启动过程并建立其动态模型,分析了产生过冲电流的原因,介绍了冲击电流幅值的估算方法,在此基础上提出了一种新型软启动控制方法,并通过仿真与实验验证了理论分析。
Three-phase voltage source pulse width modulation (PWM) AC/DC converters with a passive damped LCL filter are widely applied into medium and high power devices, and able of transporting bi-directional power.Owing to advantages such as high precision and fast dynamic response, direct current control based on d,q transform is widely employed in three-phase voltage-source PWM AC/DC converters.The traditional proportion integral(PI) regulators in synchronous rotating frame is easy to generate inrush current during start-up period and therefore increasing the stresses on switches and influencing device selection and reliability.It is required to study the start-up inrush process suppression method.The process of start-up period is analyzed, the cause of start-up inrush current is found and the mathematical model is established to estimate inrush current.A novel soft starting methods are proposed.Simulation and experiments verify the validity of the principle analysis.
出处
《电力电子技术》
CSCD
北大核心
2013年第5期1-3,共3页
Power Electronics
基金
国家高技术研究发展计划(2011AA11A249)
江苏省优势学科建设项目(BY2012021)
江苏省高校自然科学研究资助项目(12KJB470013)~~
关键词
整流器
启动冲击
软启动
rectifier
start-up inrush
soft starting