Power System Harmonics

West Virginia University
DOI: 10.1002/047134608X.W6214 In book: Wiley Encyclopedia of Electrical and Electronics Engineering
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    • "An important issue is the consideration of the nonlinearities; for example, the simplest approaches assume no interaction between network and nonlinear devices [3][4]. Other methods such as iterative harmonic analysis contemplate the effect of the harmonic voltage on the representation of the nonlinear devices but with the limitation that the fundamental voltages are assumed to be unaffected by harmonic voltages [5][6]. Some reformulations of the conventional load flow exist in order to include nonlinear devices; the fundamental and harmonic voltages can be assumed to produce power consumption [7]-[9]. "
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    ABSTRACT: The increase of nonlinear devices in power systems leads us to consider their adverse effects on the waveform distortion, and consequently, the effects and propagation of this harmonic distortion over the whole power system. This paper presents the analysis of the adverse impact caused by the harmonic distortion generated by the thyristor-controlled series capacitor (TCSC) and its interaction with the transmission line. The analysis is carried out on the frequency domain, where total harmonic distortion, apparent power, active power, reactive power, distortion power and power losses are presented under different TCSC operation condition. The analysis of a four-node radial power system exhibiting harmonic distortion because of the TCSC operation is presented.
    Full-text · Article · Jan 2014 · Electric Power Systems Research
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    • "However, at high levels of the rms voltage, the resulting saturation of the transformer core will cause much higher emission levels. Based on Fig. 3.3 in [18], the magnetizing harmonics are estimated for 110 % and 120 % of nominal voltage as shown in Table 3. "
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    ABSTRACT: This paper discusses a number of ways in which wind power installations can impact the harmonic levels in the power system. Wind turbines are an additional source of harmonic emission, especially when it concerns “non-characteristic harmonics.” Parallel resonances can amplify the emission from individual turbines. A mathematical model is developed to quantify this amplification. Series resonances can result in high currents, driven by the background voltage distortion in the transmission grid, flowing into the wind park. Weakening of the transmission grid will increase lower order harmonics but reduce higher order harmonics.
    Full-text · Article · Jun 2013
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    • "A study direction is represented by the analysis of physical phenomena that lead to alterations in parameters of voltage and current in AC networks [1], [2]. Another direction deals with getting new methods to decrease the negative effects on power quality, especially harmonics, unbalance and reactive power flow [3], [4], and [5]. A continuous activity takes place in the establishment define requirements related to parameters of power quality. "
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    ABSTRACT: This paper presents some aspects of power analyzers utilization, related with your calibration by metrological laboratory. The full metrological characterization of power analyzers is a difficult technical process because the specifications in related standard are minimal. After a short presentation of parameters and measurement methods recommended by the important standards in the field of power quality, CEI EN 50160 and CEI EN 61000-4030, study of uncertainty propagation related to test calibration, this document describes the instruments configuration and evaluation of measurement errors and uncertainties for one parameter, voltage in sinusoidal and non-sinusoidal regime.
    Full-text · Conference Paper · May 2013
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