随着电力电子技术的发展,电力线路中变频器、逆变换器、UPS等设备故障时, 产生的剩余电流不再只是工频正弦波形,而是脉动直流波形信号。脉动直流剩余电流包括正弦交流、正弦半波(半波)、90°触发角正弦(90°波)和135°触发角正弦(135°波)等四种典型的接地故障电流波形。脉动直流电流会使传统的针对工频正弦交流设计的剩余电流保护器拒动作或者误动作。
原油形式,切碎,脉动直流电流从传统充电器生产效率较低的收费。
The crude form, chopped, pulsating DC current from conventional chargers produces a less efficient charge.
另外,还对滤波器的结构和参数对输出直流电压脉动和发电机相电流波形的影响及相电流谐波进行了仿真分析。
In addition, the thesis analyzes the influence of the filter structure and parameters on the output DC voltage ripple and the shape of phase currents, as well as harmonics of phase currents.
高速条件下,无刷直流电动机的电流换向产生严重滞后,导致转矩下降并伴随脉动。
Serious commutation lag occurs when a Brushless DC Motor (BLDCM) operates at high speeds, and this leads to torque decline with ripple.
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