Harmonic Contributions of Utility and Customer Based on Load Model Using Field Measurements

Abstract

In recent years, sinusoidal waveform of the current and voltage disturbs in the electrical distribution system because of the due to the increasing number of non-linear loads. Many standards of IEC and IEEE standards have been published in order to limit the voltage and current waveform distortion. The operators of the electricity distribution network widely use the power quality monitoring systems at the point of common connection (PCC). It has been identified that there are substantial number of harmonic currents excess of the standards transferred to the grid according to the data obtained from power quality monitoring systems. In case of exceeding the limits specified in the standards, there is a need to determine the network and customer responsibilities for the implementation of required sanctions. In this study, using recorded data at the PCC of a medium voltage electrical distribution system, voltage and current harmonic distortion responsibilities of the network and customer are determined by the improved harmonic current vector method. Up-to-date load model based on field measurement which provides more accurate results has been used instead of the constant load impedance in the proposed method.

Harmonic Source Detection Methods: A Systematic Literature Review

“…There are many different software packages that power utilities are using to conduct harmonic studies. On top of those tools is Matlab/Simulink as used in references such as [14], [16]- [19], [24], [49], and PSCAD as in [9]. Other general computation software is used such as MathCAD as in [35].…”

Harmonic load modeling: a case study of 33 kV Abuja Steel Mill Feeder

“…Similarly, DigSilent/Power factory is the simulation software used in Ma et al [13] to evaluate the future levels of harmonic distortion in a power grid based on the present harmonic current source model developed from measured data. The second group of literature review proposed the use of equivalent circuit models to represent characteristic harmonic producing loads [14]- [16]. The Norton/ Thevenin equivalent circuit provides a reliable model for harmonic current and voltage sources in a distribution network.…”

“…The Norton/ Thevenin equivalent circuit provides a reliable model for harmonic current and voltage sources in a distribution network. The contribution of the power utility equipment and customer loads to total harmonic distortion observed at the point of common coupling (PCC) can separately be evaluated using field data and analytical techniques [14]. The major challenge of the Thevenin/Norton equivalent circuit models is the determination of the impedance and other parameters of the power network.…”

“…Although the PQube records up to the 63 rd order Harmonic, this research truncates harmonics above 40 th order since the higher order harmonics were observed to have low amplitudes. Fourier series expresses every periodic function as given in equation 1 [11], [14], [15] …”