Effect of harmonic distortion in reactive power measurement

1992 ◽  
Vol 28 (4) ◽  
pp. 782-787 ◽  
Author(s):  
E.B. Makram ◽  
R.B. Haines ◽  
A.A. Girgis
Keyword(s):  
Reactive Power ◽  
Harmonic Distortion ◽  
Power Measurement

scholarly journals Distribution system power quality compensation using a HSeAPF based on SRF and SMC features

2021 ◽  
Author(s):  
Akram Qashou ◽  
Sufian Yousef ◽  
Abdallah A. Smadi ◽  
Amani A. AlOmari
Keyword(s):  
Power Distribution ◽  
Distribution System ◽  
Reactive Power ◽  
Sliding Mode ◽  
Distribution Network ◽  
Harmonic Distortion ◽  
Phase Locked Loop ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Non Linear

AbstractThe purpose of this paper is to describe the design of a Hybrid Series Active Power Filter (HSeAPF) system to improve the quality of power on three-phase power distribution grids. The system controls are comprise of Pulse Width Modulation (PWM) based on the Synchronous Reference Frame (SRF) theory, and supported by Phase Locked Loop (PLL) for generating the switching pulses to control a Voltage Source Converter (VSC). The DC link voltage is controlled by Non-Linear Sliding Mode Control (SMC) for faster response and to ensure that it is maintained at a constant value. When this voltage is compared with Proportional Integral (PI), then the improvements made can be shown. The function of HSeAPF control is to eliminate voltage fluctuations, voltage swell/sag, and prevent voltage/current harmonics are produced by both non-linear loads and small inverters connected to the distribution network. A digital Phase Locked Loop that generates frequencies and an oscillating phase-locked output signal controls the voltage. The results from the simulation indicate that the HSeAPF can effectively suppress the dynamic and harmonic reactive power compensation system. Also, the distribution network has a low Total Harmonic Distortion (< 5%), demonstrating that the designed system is efficient, which is an essential requirement when it comes to the IEEE-519 and IEC 61,000–3-6 standards.

scholarly journals Performance Comparison of 2L-VSC, 3L-NPC, and 3L-MMC Converter Topologies for Interfacing Grid-Connected Systems

2021 ◽  
Author(s):  
Victor R. F. B. de Souza ◽  
Luciano S. Barros ◽  
Flavio B. Costa
Keyword(s):  
Reactive Power ◽  
Harmonic Distortion ◽  
Performance Comparison ◽  
Test Results ◽  
Multilevel Converter ◽  
Simulation Test ◽  
Comparative Performance ◽  
Higher Power ◽  
Converter Topologies ◽  
Level Converter

Nowadays, power converters play a fundamental role in the conditioning and processing of active and reactive power, and are directly related to power quality indexes. In this sense, new multi-level converter topologies have been integrated in order to provide higher power processing capacity with lower harmonic distortion, switch stress, heating, and losses. The use of these structures compared to conventional two-level converters is especially suitable for high power of the order of megawatt. Considering the relevance of this approach, this paper presents a comparative performance analysis among the conventional two-level topology (2L-VSC) and two multilevel topologies in a grid-connected system: neutral point clamped (NPC) and modular multilevel converter (MMC). Simulation test results present the impacts on voltages and currents for the switches and the whole system, as well as the evaluation of the total harmonic distortion (THD) in order to highlight the crucial points of each topology for this kind of application.

A New Improved Walsh Function Algorithm for Active and Reactive Power Measurement

2014 ◽  
Vol 67 (3) ◽  
Author(s):  
Garba Aliyu ◽  
Saifulnizam Abd. Khalid ◽  
Jafaru Usman ◽  
Ahmad Fuad A. Aziz ◽  
Hussein Shareef
Keyword(s):  
Reactive Power ◽  
Walsh Function ◽  
Power Measurement ◽  
Nonlinear Load ◽  
Active And Reactive Power ◽  
Linear Load ◽  
Alternative Approach ◽  
Three Phase ◽  
Linear And Nonlinear ◽  
High Level

This paper present improved Walsh function (IWF) algorithm as an alternative approach for active and reactive power measurement in linear and nonlinear, balanced and unbalanced sinusoidal three phase load system. It takes advantage of Walsh function unified approach and its intrinsic high level accuracy as a result of coefficient characteristics and energy behaviour representation. The developed algorithm was modeled on the Matlab Simulink software; different types of load, linear and nonlinear were also modeled based on practical voltage and current waveforms and tested with the proposed improved Walsh algorithm. The IEEE standard 1459-2000 which is based on fast Fourier transform FFT approach was used as benchmark for the linear load system while a laboratory experiment using Fluke 435 power quality analyzer PQA which complies with IEC/EN61010-1-2001standards was used to validate the improved algorithm for nonlinear load measurement. The results showed that the algorithm has the potential to effectively measure three phase power components under different load conditions.

An improved three-phase reactive power measurement algorithm using walsh functions transform

2013 ◽  
Vol 9 (1) ◽  
pp. 7-14 ◽  
Author(s):  
Garba Aliyu ◽  
Saifulnizam Bin Abd. Khalid ◽  
Mohd Wazir Mustafa ◽  
Hussein Shareef
Keyword(s):  
Reactive Power ◽  
Power Measurement ◽  
Walsh Functions ◽  
Three Phase ◽  
Measurement Algorithm

Predictive Direct Power Control (PDPC) of Grid-connected Dual-active Bridge Multilevel Inverter (DABMI)

2017 ◽  
Vol 8 (4) ◽  
pp. 1524 ◽  
Author(s):  
H.H. Goh ◽  
Azuwien Aida ◽  
S.S. Lee ◽  
S.Y. Sim ◽  
K.C. Goh
Keyword(s):  
Power Control ◽  
Reactive Power ◽  
Power Grid ◽  
Harmonic Distortion ◽  
Multilevel Inverter ◽  
Energy Integration ◽  
Direct Power ◽  
Direct Power Control ◽  
Dual Active Bridge ◽  
Model Predictive Control Algorithm

This paper deals with controlling a grid-connected dual-active bridge multilevel inverter for renewable energy integration. The concept of direct power control is integrated with model predictive control algorithm, which is termed as predictive direct power control, to control the real and reactive power injected into the power grid. The proposed multilevel inverter allows more options of feasible voltage vectors for switching vector selections in order to generate multilevel outputs, and thereby obtaining high power quality in the power grid. By using the predictive direct power control, simulation results show that the proposed multilevel inverter produces lower power ripple and manage to achieve currents with low total harmonic distortion which are well within the IEEE standard. The modeling and simulation of the system are implemented and validated by MATLAB Simulink software.

scholarly journals A Driving Technique for AC-AC Direct Matrix Converters Based on Sigma-Delta Modulation

Energies ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 1103 ◽  
Author(s):  
Simone Orcioni ◽  
Giorgio Biagetti ◽  
Paolo Crippa ◽  
Laura Falaschetti
Keyword(s):  
Reactive Power ◽  
Harmonic Distortion ◽  
Direct Conversion ◽  
Switching Noise ◽  
Power Comparison ◽  
Sigma Delta Modulation ◽  
Sigma Delta ◽  
Matrix Converters ◽  
Delta Modulation ◽  
Vector Modulation

Direct conversion of AC power between three-phase systems operating at different frequencies can be achieved using solid-state circuits known as matrix converters. These converters do not need energy storage elements, but they require sophisticated control algorithms to operate the switches. In this work we propose and evaluate the use of a sigma-delta modulation approach to control the operation of a direct matrix converter, together with a revised line filter topology suited to better handle the peculiarities of the switching noise produced by the sigma-delta modulation. Simulation results show the feasibility of such an approach, which is able to generate arbitrary output waveforms and adjust its input reactive power. Comparison with a space vector modulation implementation shows also better performance about total harmonic distortion, i.e., less harmonics in the input and output.

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