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The distortion of a current-steering digital-to-analog converter (DAC) is often dominated by the signal-dependent output impedance. This has normally been analysed by assuming a purely resistive load. When a digital IF signal is generated, the different harmonic bands are separated and can also be filtered separately. This paper illustrates that linearity can be improved considerably by shorting the...
Some methods of detecting harmonic current in the power system were analyzed in this paper, the models were built and simulated with Matlab simpowersystem module, result indicates ip-iq method can detect harmonic currents in the balanced power system and as long as doing an improvement slightly, can use single phase ip-iq to check the harmonic electric current in the single phase system, or to apply...
This paper proposes a novel detection approach for harmonics in strong additive background noise. Firstly, a wavelet packet transform based filter bank was used to decompose the received noisy signal into several orthogonal sub-band signals. And then, combined with adaptive threshold floating technique, a group of sliding power detectors was applied to detect each given sub-band signals respectively...
Wind-power distributed generation (DG) converters may inject considerable amount of harmonics into their connected distribution systems that could exceed its connected utility tolerance or IEEE 1547 Std. limits. This paper presents a new adaptive harmonics detection active (AHDA) filter that is designed to suppress harmonics produced by wind DG converters. The AHDA filter consists of an inverter of...
Based on the adaptive algorithm, an improved algorithm for LMS estimation in harmonic detection is presented in this paper. And the APF based on LMS algorithm can be used under the conditions of three-phase unbalanced and nonlinear loads, can be applicable to detect harmonic, reactive and negative sequence currents respectively or the sum of ones. At the same time the smaller error and better convergent...
Power quality of AC excited variable speed constant frequency (VSCF) generator, which adopts cycloconverter as exciting device, canpsilat meet the need of power system well because of harmonics in the output voltage of cycloconverter. So, how to reduce harmonics is an important problem for VSCF generator. A new active power filter method named synchronous filter method is presented in this paper,...
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