Research of Harmonics Measurement Aalgorithim Based on HHT

The measurement of power parameters is one of the most basic calculation in power systems, it plays a key role on running power systems in security, economy and reliability. This thesis studys the application of the Hilbert-Huang transform in the field of nonstationary electric power signal in the aspects of amplitude nonstationary, on which the traditional methods work not very well. Much MATLAB simulation shows that HHT is more suitable than DFT to analyze the nonstationary electric power signal. HHT is excellent in the amplitude nonstationary signal analysis. In this thesis, the structure, the function, the communication mode, the application and the trend of development of Power Analyzer are analyzed. Finally, a self-developed chip named Power Analyzer used for measuring of power parameter based on TMS320F2812 processor is designed. The instrument can attain 0.2 grade of RMS, 0.2 grade of power and high-precision measurement of 2 to 31 harmonics. Its real-time performance is very good.