Dynamic Var/Harmonic Compensation with Inverter-Less Active Filters

2008 ◽  
Author(s):  
Anish Prasai ◽  
Jyoti Sastry ◽  
Deepak Divan
Keyword(s):  
Active Filters ◽  
Harmonic Compensation

scholarly journals Distributed Power Quality Conditioning System for Three-Phase Four-Wire Low Voltage Networks

Energies ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4915 ◽  
Author(s):  
Valery Dovgun ◽  
Sergei Temerbaev ◽  
Maxim Chernyshov ◽  
Viktor Novikov ◽  
Natalia Boyarskaya ◽  
...  
Keyword(s):  
Power Quality ◽  
Low Voltage ◽  
Filter Design ◽  
Design Procedure ◽  
Active Filters ◽  
Hybrid Filter ◽  
Harmonic Compensation ◽  
Distributed Power ◽  
Voltage Unbalance ◽  
Three Phase

This paper presents distributed power quality conditioning system to compensate current and voltage distortions in three-phase four-wire networks caused by unbalanced non-linear single-phase loads. The proposed conditioning system consists of several hybrid filter units installed in various nodes for compensation of excessive neutral currents and voltage distortions in a selected area of the distribution network. The system is open and it can be easily modified by installation of new filter units. A novel hybrid filter design procedure based on filter frequency characteristics optimization in the parameters of passive and active parts is presented. A digital system of control signal computation for active filters based on the use of modern methods of spectral analysis is considered. The proposed digital control system enables selective compensation of fundamental and harmonic components. The mathematical model of the proposed power quality conditioning system is developed in the MatLab software. The simulated results show that the presented conditioning system reduces the level of neutral conductor currents and the voltage unbalance as well ensures harmonic compensation in three-phase four-wire networks.

scholarly journals Reactive Power and Current Harmonic Control Using a Dual Hybrid Power Filter for Unbalanced Non-Linear Loads

Energies ◽  
2018 ◽  
Vol 11 (6) ◽  
pp. 1392 ◽  
Author(s):  
Leonardo Rodrigues Limongi ◽  
Fabricio Bradaschia ◽  
Calebe Hermann de Oliveira Lima ◽  
Marcelo Cabral Cavalcanti
Keyword(s):  
Reactive Power ◽  
Active Filters ◽  
Nonlinear Loads ◽  
Harmonic Compensation ◽  
Current Harmonics ◽  
Current Harmonic ◽  
Electrical Grid ◽  
Hybrid Power ◽  
Quality Issue ◽  
Non Linear

An important power quality issue is related to current harmonic components demanded by non-linear loads. A solution to mitigate this issue is to use hybrid power filters (HPFs), that apply low power active filters with passive filters. Some dual-converter topologies have been shown to be attractive due to a better compensation performance compared with single filters, where the HPFs give a reactive power support (an extra feature) together with harmonic compensation. On the other hand, the drawback of dual converters is the high number of active switches. Besides that, due to the high number of unbalanced non-linear loads connected to the electrical grid, triplen harmonics can appear. However, traditional HPFs do not compensate triplen harmonics, which usually have considerable values. Therefore, in this paper, a dual HPF based on the nine-switch inverter (DHPF-NSI) is proposed to compensate current harmonics and to provide reactive power support. The NSI presents a reduced number of switches when compared with classical dual topologies. The compensation of the third harmonic caused by unbalanced nonlinear loads was also inserted in the control system. Experimental results are presented for the DHPF-NSI in order to demonstrate the reactive power and harmonic compensation performances.

A Modified Current Controller for H-Bridge Active Filter to Reduce Harmonics in Single Phase System

2014 ◽  
Vol 573 ◽  
pp. 122-129
Author(s):  
A. Naraina ◽  
S.N. Deepa
Keyword(s):  
Single Phase ◽  
Pulse Width Modulation ◽  
Active Filters ◽  
Switching Frequency ◽  
Phase System ◽  
Voltage Reference ◽  
Harmonic Compensation ◽  
Zero Crossings ◽  
Pulsewidth Modulation ◽  
Current Controller

— this paper presents a digital current controller for H-bridge pulse width modulation (PWM) converters, whose sampling frequency equals quadruple of the switching frequency,. This current regulator detects the ac current and manipulates the voltage reference not only at the upper and lower peaks of the PWM triangle carrier but also at its zero crossings. A modified deadbeat current regulator is proposed to suppress the current oscillation induced by the voltage error, based on the theoretical analysis. Experimental results are shown to verify the control performance of the proposed current regulator. Moreover, a proposed current regulator is applied to a single-phase active power filter to demonstrate the effectiveness in harmonic compensation. Index Terms—Current regulators, digital control, DSPs, pulsewidth modulation (PWM), shunt active filters.

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