基于PFC的非正弦电力系统参数检测

Parameter measuring in nonsinusoidal electric power system based on PFC

针对目前电力系统电压、电流波形畸变,导致大多数以50Hz标准正弦波为测试对象而设计的有功功率和功率因数测量仪表测量精度下降的实际情况,提出一种由乘积频率转换器(PFC)和微控制器(MCU)构成的非正弦电力系统实际有功功率及功率因数的自动测量仪。采用乘积频率转换器将电网的瞬时电压、电流信号的乘积转换成与之成正比的频率信号送入87c52单片机处理后得到实际的有功功率和功率因数值。该系统可用于任意波形真有功功率和功率因数的检测。实际表明:该系统电路结构简单、集成度高,测量灵敏、性能稳定。

Due to the wave distortion of voltage and current in power system,the measurement accuracy of active power and power factor decreases in most measuring instruments designed for 50 Hz standard sine wave. An automatic meter for true active power and power factor of nonsinusoidal electric power system is put forward ,which is composed of PFC （Product Frequency Converter） and MCU（Micro Control Unit）. The PFC converts the product of instantaneous network voltage and current into a proportional frequency signal,which is sent into 87c52 for processing to get the true active power and power factor. The meter can be used to measure the true active power and power factor in any wave type. The practice shows that the system is simple,highly integrated,sensitive and stable.