【作者】 王崇林； 李钢；

【Author】 WANG Chong-lin,LI Gang (Information Electronic College,China University of Mining and Technology,Xuzhou 221008,China)

【机构】 中国矿业大学信电学院；

【摘要】 实际煤矿电网中三相电源电压畸变且不对称,含有大量负序分量,基于瞬时无功功率理论的i_p-i_q电流检测法将产生误差,需要提取出A相正序电压。改进的瞬时对称分量法通过构造一个无延迟的旋转相量,能准确计算出A相电压正序值,通过修正指令电流消除信号采样、指令电流运算和PWM控制带来的延迟,最后按SVPWM电流控制方法实现对指令电流的跟踪。Simulink仿真结果表明,改进的瞬时对称分量法准确地分离出A相正序电压,既有效改善了电流补偿效果,又提高了煤矿电网电能质量。更多还原

【Abstract】 In the actual power system,three-phase voltage is distorted and asymmetric which contains a large number of negative sequence components,the i_p-i_q electric current based on instantaneous reactive power theory will cause error,so the positive sequence voltage component of A phase need be extracted.The improved instantaneous symmetrical components can calculate A phase positive sequence value through making up a none-delay rotation phasor,the delay of signal sampling,the calculation of reference current and PWM control is eliminated by revised instruction electric currency.Last,realize the tracking of instruction electric currency by SVPWM electric currency control method.The Simulink stimulation result shows that the improved instantaneous symmetrical components can accurately separate A phase positive sequence voltage,not only improves the effect of electric current compensation,but also enhances the quality of coal power.更多还原