Harmonic Analysis in Frequency and Time Domain (original) (raw)

2013, IEEE Transactions on Power Delivery

This paper presents a review with a concise description and analysis of the fundamentals, characteristics, analytical details, merits, and drawbacks associated with existing methods in frequency and time domain for harmonic analysis in practical power networks. The description and analysis are centered on methods developed in the harmonic domain, hybrid frequency-time domain, and time domain, respectively. Validation of the reviewed methods for harmonic analysis, against one of the widely accepted digital simulators, such as EMTP, EMTDC, or MATLAB/SIMULINK, is reported in the cited individual contributions. Index Terms-Harmonic domain, Hartley transform, hybrid frequency-time domain, nonlinear elements, time varying. I. INTRODUCTION A POWER system, operating under ideal conditions, is expected to be perfectly balanced, of a single frequency, and with sinusoidal current and voltage waveforms of constant amplitude. However, in practical power systems, this ideal operational mode is not encountered, since the network components, at a lesser or greater extent, have the undesirable effect of distorting the original sinusoidal waveforms. Nonlinear components and loads, such as power converters, flexible ac transmission systems (FACTS) devices, nonlinear saturation and hysteresis in components with magnetic cores, fluorescent lamps and arc furnaces, among others, represent the main contribution to this effect, known as harmonic distortion. Adverse quality of power effects due to harmonic distortion are, for instance, interference with communication, control and protection systems, reduction of the equipment's life span, and additional losses in the power system. Diverse harmonic distortion issues, such as its causes, effect on quality of power, standards and mitigation techniques, are described in literature [1], [2]. Digital harmonic analysis relies on harmonic detection and prediction, respectively. The first processes in real-time data of the monitored harmonic content in the network, while the last Manuscript