The Study Of Metering Harmonic Energy In Electric Power System

With the development of power electronics, harmonic, which is produced by power electronic equipments, pollutes the power system more and more seriously. Not only harmonic influences the power system and equipments, but also the power energy wasting made by harmonic is increasing. This reduces the efficiency of power energy.The structure and measure method of the current measurement equipments decide that there is error if they are used in power system containing harmonic. So, there must be a reasonable method to separate the harmonic source at the point of common coupling and measured independently. In this way, we can accurately measure the power of both basic wave and different harmonic source. This provides the foundation of solving the harmonic problem and punishing the harmonic source which is surpass the standard.Based on analyzing the influence of harmonic on measurement the power energy and the necessary to measure the harmonic, and studying the harmonic detecting method based on FFT and harmonic source separation method and harmonic power calculation method, a metering harmonic energy method is presented. This method can be used in measuring the harmonic power which is made by power system and custom at the point of common coupling.It has been proved by simulated experiment that the metering harmonic energy method is feasible. The scheme of the whole equipment is designed. It's divided into two modules. One is data collection module, the other is data process module. SOC chip PL3201 is the core of data collection module. The hardware and software is implemented and debugged successfully. Data collection circuit core chip is ARM and the hardware and software are framed primarily. Through the farther work, the harmonic energy method and equipment can be applied in power system.