A New Approach for Harmonic Distortion Minimization in Power Systems Supplying Nonlinear Loads

Increase in the number of nonlinear loads and devices in energy and power systems have raised harmonic distortion on voltage and current signals. Harmonics are one of the primary factors in determining power quality. Therefore, measurement and control of harmonics are crucial. Many methods have developed for harmonic analysis. In this study, a simulator which uses Hartley transform for determining harmonics is designed. Harmonic distributions and parameters of loaded/defined signals can be calculated accurately and effectively and obtained results can be displayed numerically and graphically with developed systems which have user friendly interface.

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Current and Voltage Harmonic Distortion Minimization in Nonlinear Loads

2020 4th International Conference on Vocational Education and Training (ICOVET) ◽

10.1109/icovet50258.2020.9230217 ◽

2020 ◽

Author(s):

Langlang Gumilar ◽

Arya Kusumawardana ◽

Muhammad Afnan Habibi ◽

Soraya Norma Mustika ◽

Wahyu Sapto Nugroho

Keyword(s):

Harmonic Distortion ◽

Nonlinear Loads ◽

Distortion Minimization

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Power flow in radial distribution systems in the presence of harmonics

IJEEC - INTERNATIONAL JOURNAL OF ELECTRICAL ENGINEERING AND COMPUTING ◽

10.7251/ijeec1801011m ◽

2019 ◽

Vol 2 (1) ◽

Author(s):

Miloš Milovanović ◽

Jordan Radosavljević ◽

Bojan Perović ◽

Milorad Dragičević

Keyword(s):

Power Systems ◽

Radial Distribution ◽

Power Flow ◽

Distribution Systems ◽

Flow Problem ◽

Harmonic Distortion ◽

Distribution Networks ◽

Nonlinear Loads ◽

Harmonic Power ◽

Power Flow Problem

This paper presents the results of power flow calculations in the presence of harmonics in radial distribution systemsobtained using the decoupled harmonic power flow (DHPF) algorithm. In this algorithm, the interaction among the harmonicfrequencies is assumed to be negligible and hence the calculations are separately performed for every harmonic order of interest. Adetailed methodology for calculating current and voltage high order harmonics, harmonic losses and total harmonic distortion ofvoltage of the electrical distribution networks in the frequency domain is presented. The standard backward/forward sweep method isused for solving the power flow problem at the fundamental frequency. Furthermore, some practical and approximated models ofnetwork components in harmonic analysis are given. The performance of the DHPF approach is studied and evaluated on two standardtest systems with nonlinear loads, the distorted IEEE 18-bus and IEEE 33-bus. Nonlinear loads are treated as harmonic current sourcesthat inject harmonic currents into the system. The DHPF algorithm is verified by comparing its results with those generated bysoftware tools for the analysis of transmission, distribution and industrial power systems (i.g. ETAP and PCFLO). Simulation resultsshow the accuracy and efficiency of the applied procedure for solving the harmonic power flow problem.

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Harmonics Mitigation Based on the Minimization of Non-Linearity Current in a Power System

Designs ◽

10.3390/designs3020029 ◽

2019 ◽

Vol 3 (2) ◽

pp. 29 ◽

Cited By ~ 1

Author(s):

Mohammed S. Almutairi ◽

Sillas Hadjiloucas

Keyword(s):

Power Systems ◽

Power System ◽

Harmonic Distortion ◽

Nonlinear Loads ◽

Loading Constraints ◽

Harmonic Pollution ◽

Point Of Common Coupling ◽

Ieee Standards ◽

Total Voltage ◽

Practical Constraints

Harmonic issues in power systems are becoming an important topic for industrial customers and power suppliers alike due to their adverse effects in both consumer appliances as well as for utility suppliers. Consumers should seek to reduce harmonic pollution, regardless of voltage or current distortion already present in the network. This article suggests a new method for suppressing distortions by using the non-linearity current index (NLCI) to determine the shunt single-tuned passive filter (STPF) compensator value in non-sinusoidal power systems, with the objective of maintaining the power factor within desired limits. The objective of the proposed method is to minimize the nonlinear current of customer’s loads in the power system at the point of common coupling (PCC). Moreover, the proposed design takes into consideration other practical constraints for the total voltage and individual harmonic distortion limits, ensuring compliance with (Institute of Electrical and Electronics Engineers) IEEE 519-2014 guidelines, maintaining distortions at an acceptable level while also abiding by the capacitor loading constraints established in IEEE 18-2012. The performance of the optimally designed compensator is assessed using well documented IEEE standards based on numerical examples of nonlinear loads taken from previous publications.

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New Approach to Assess Unbalance and Harmonic Distortion in Power Systems

Renewable Energy and Power Quality Journal ◽

10.24084/repqj11.493 ◽

2013 ◽

pp. 946-949 ◽

Cited By ~ 1

Author(s):

Patricio Salmerón ◽

Alejandro Pérez ◽

Salvador P. Litrán

Keyword(s):

Power Systems ◽

Harmonic Distortion ◽

New Approach

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New approach to modeling the nonlinear loads

E3S Web of Conferences ◽

10.1051/e3sconf/201913901055 ◽

2019 ◽

Vol 139 ◽

pp. 01055

Author(s):

L.I. Kovernikova ◽

Van Chung Luong

Keyword(s):

Power Systems ◽

Power Quality ◽

Methodological Approach ◽

Operating Conditions ◽

Reliable Operation ◽

Electric Networks ◽

Nonlinear Loads ◽

New Approach ◽

Probabilistic Nature ◽

Technical Measures

Parameters of operating conditions of electric power systems shall ensure efficient and reliable operation of both power generating companies and of consumers, which to a great extent depends on power quality. Most urgent problem in this area is currently non-sinusoidal voltage. Power quality control, development of technical measures to sustain parameters of harmonic modes in conformity with provisions of GOST 32144-2013 require calculations that, in turn, need models adequately representing the electric networks and nonlinear loads in the computing program. Results of studies on parameters of harmonic modes that were obtained by measurements have shown that harmonic modes are random, and their parameters have probabilistic nature. Due to unpredictability of harmonic modes, nonlinear loads can be modeled using measured parameters. The paper presents methodological approach, algorithms and a computing program for modeling the nonlinear loads using parameters measured in the nodes of their connection to the power supply, and gives examples of modeling the nonlinear loads.

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The delta resonator: a new approach to load compensation theory in three-phase power systems

IEE Proceedings C Generation Transmission and Distribution ◽

10.1049/ip-c.1989.0052 ◽

1989 ◽

Vol 136 (6) ◽

pp. 381

Author(s):

A. Premoli ◽

F. Tosato

Keyword(s):

Power Systems ◽

New Approach ◽

Load Compensation ◽

Three Phase ◽

Compensation Theory

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Dual Two-Level Voltage Source Inverter Virtual Inertia Emulation: A Comparative Study

Energies ◽

10.3390/en14041160 ◽

2021 ◽

Vol 14 (4) ◽

pp. 1160

Author(s):

Mohammad Ali Dashtaki ◽

Hamed Nafisi ◽

Amir Khorsandi ◽

Mojgan Hojabri ◽

Edris Pouresmaeil

Keyword(s):

Harmonic Distortion ◽

Synchronous Generator ◽

Voltage Source ◽

Small Signal ◽

Voltage Source Inverter ◽

Nonlinear Loads ◽

Virtual Inertia ◽

The Stability ◽

Stability Enhancement ◽

Oscillation Damping

In this paper, the virtual synchronous generator (VSG) concept is utilized in the controller of the grid-connected dual two-level voltage source inverter (DTL VSI). First, the topology of the VSG and the DTL VSI are presented. Then, the state-space equations of the DTL VSI and the grid-connected two-level voltage source inverter (TL VSI), regarding the presence of the phase-locked loop (PLL) and the VSG, are given. Next, the small-signal modeling of the DTL VSI and the TL VSI is realized. Eventually, the stability enhancement in the DTL VSI compared with the TL VSI is demonstrated. In the TL VSI, large values of virtual inertia could result in oscillations in the power system. However, the ability of the DTL VSI in damping oscillations is deduced. Furthermore, in the presence of nonlinear loads, the potentiality of the DTL VSI in reducing grid current Total Harmonic Distortion (THD) is evaluated. Finally, by using a proper reference current command signal, the abilities of the DTL VSI and the TL VSI in supplying nonlinear loads and providing virtual inertia are assessed simultaneously. The simulation results prove the advantages of the DTL VSI compared with the TL VSI in virtual inertia emulation and oscillation damping, which are realized by small-signal analysis.

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