CAJ | 학술논문

针对使用三相电压源型逆变器的直流母线电流传感器信息,重构电机相电流方法中存在非可测量区域的问题,在分析相电流重构基本原则和现有脉冲宽度调制(PWM)信号修整方法的基础上,提出了通过平移桥臂开关状态波形来修整PWM信号的方法,该方法不增加功率器件的开关损耗,且满足非零电压空间矢量最小作用时间的要求.应用空间电压矢量分析方法证明了修整后的PWM信号在一个开关周期内不改变参考电压的幅值及相位,从而保证了电机相电流具有低的谐波畸变率.以交流永磁电机驱动系统为例进行了实验研究,结果表明采用该方法在稳态和瞬态的情况下都能够精确重构电机相电流.
침대사용삼상전압원형역변기적직류모선전류전감기신식,중구전궤상전류방법중존재비가측량구역적문제,재분석상전류중구기본원칙화현유맥충관도조제(PWM)신호수정방법적기출상,제출료통과평이교비개관상태파형래수정PWM신호적방법,해방법불증가공솔기건적개관손모,차만족비령전압공간시량최소작용시간적요구.응용공간전압시량분석방법증명료수정후적PWM신호재일개개관주기내불개변삼고전압적폭치급상위,종이보증료전궤상전류구유저적해파기변솔.이교류영자전궤구동계통위례진행료실험연구,결과표명채용해방법재은태화순태적정황하도능구정학중구전궤상전류.
There are some immeasurable regions in the voltage vector plane while reconstructing motor phase currents from the information of a single de-link current sensor in the 3-phase voltage source inverter. After having analyzed the principle of phase current reconstruction, as well as some existent pulse width modulation (PWM) signal modification approaches, this paper presented a novel PWM signals modification method by moving the switching state waveform of the inverter's 3 legs along the axis. The method met the request of minimum applying time of active voltage space vectors, and the inverter losses were unaltered comparison with traditional strategy. Using space vector analysis method, it was revealed that,after modification, the reference voltage vectors maintain its amplitude and orientation in a PWM switching interval, so that the waveform distortion of the phase current caused by modification was quite low.Experimental results obtained from the test drive system using a permanent magnet ac motor show that the reconstructed phase current faithfully represents the actual one during both steady state and transient conditions.