摘要
为满足大型火电厂一类辅机变频器高低电压穿越支持装置的试验要求,提出了一种基于脉宽调制（PWM）技术的三相暂升/暂降电源。系统由升压变压器、整流桥、三相H桥逆变器和正弦波滤波器组成,装置支持三相电压的暂升/暂降,变化范围0～560V无级调节。实验证明,该系统具有可灵活调节、输出精确以及动态响应快的优点,能模拟IEEE1159标准规定的电网电压暂升/暂降现象。
In order to provide the grid fault conditions for frequency converter＇s high and low voltage ride through testing,a three-phase voltage sag and swell generator is proposed based on the pulse width modulation（PWM） conve- rter.The proposed system consists of a transformer, rectifier, three-phase H-bridge inverters and sine-filter,which can generate swell/sag voltage from 0-560 V.The dynamic performance of the proposed system is validated with resistive- inductive and nonlinear loads situations.Experimental results show that the system has the good accuracy and fast dynamic.And both the voltage sag and swell can be generated,which meets the standard of IEEEl159.
出处
《电力电子技术》
CSCD
北大核心
2015年第12期56-58,共3页
Power Electronics
