Harmonic Flow Analysis in AC-DC Systems with Versatile Model of a Unified Power Flow Controller Using Discrete Wavelet Transform

摘要

This paper presents of the harmonic flow analysis with the 12-pulse converters of HVDC link which are harmonics current source in the ac-dc systems of a unified power flow controller(UPFC). The harmonics current source by application of Unified-Newton-Raphson method is used for the power flow calculate in systems with HVDC connected between a generator bus and the other bus type. The presents of the harmonic model of implement in the power sysytem, a network preformance equation for network studies and the versatile model for a generator. The effect of imperfect frequency response of the filters in discrete wavelet transform(DWT) filter banks, and a DWT based algorithm for harmonic analysis of nonstationary power system waveforms. The system case study is the 14 buses sysytem. The results for this condition have show low distortion of voltage and power at all buses these are caused by characteristics of harmonic currents from HVDC converters.