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This paper presents a three-phase, five-level cascaded multilevel voltage source inverter based active filter for power line conditioning to improve power quality in the distribution network. The active filter compensates both reactive power and harmonic currents drawn by non-linear loads; additionally it facilitates power factor corrections. The compensation process is based on concept of p-q theory...
This paper employs a single-phase unified quality conditioner (UPQC), an integration of shunt and series active filters (APF), to perform voltage and supply current harmonics mitigation and power factor correction. Both the shunt and series APFs are realized using a single-phase, two leg voltage source inverter (VSI). For the series APF the control strategy is based on Unit Vector Template (UVT),...
With the progress of “More Electric Aircraft”, power capacity of aircraft electric power system is increased. It is not easy for the power-quality characteristics of the system to be in compliance with the harmonic standards by using traditional method to compensate the harmonics introduced by the nonlinear load. Active power filter (APF) gets increasing usage in 50Hz power system for its high performance...
A new shunt active filter is proposed here to reduce the harmonic contents in source voltage and source currents of a harmonic polluted three phase system supplying a non-linear load. The shunt active filter is designed with a eleven level cascaded H-bridge inverter. To generate the required compensation currents multi carrier PWM Currents are extracted from the load power using Synchronous Detection...
In this paper, a novel current control technique is proposed to control both the active and reactive power of a single phase hybrid PV inverter connected to grid. The hybrid PV inverter not only maintains constant load voltage but also ensures active and reactive power flow from the grid with low THD even at the presence of non-linear load. A p-q theory based approach is used to find out the current...
This paper discusses a modular structure multilevel inverter (MSMI) with a unified constant frequency integration control (UPC) which is used as an active power filter (APF). APF is connected in shunt to the power system in order to sense the non-sinusoidal current drawn by the non-linear load and inject current to the transmission line which compensates the harmonics drawn by the load. This in turn...
This paper presents and compares the performance of two controllers namely Fuzzy Logic and Proportional Integral applied to a voltage source inverter/converter operating as an active power filter. The active power filter is operated to compensate harmonics and reactive power generated by the non-linear load and power factor correction simultaneously. This work is performed in order to make an accurate...
Based on the mathematical model of the current source inverter (CSI) in the stationary alphabeta frame, this paper proposes advanced stationary frame voltage control methods for CSI with linear and nonlinear loads to achieve zero steady-state error respectively. The voltage control strategy based on a special resonant controller for CSI with linear loads is firstly analyzed in detail, on the basis...
This paper presents a complete strategy for harmonics identification and neural control of a three-phase voltage inverter used for the power active filtering. Based on the use of neural techniques, this approach of compensation is done in two stages. The first stage extracts the harmonic currents with the diphase currents method by using Adaline neural networks. The second stage injects the harmonic...
This paper presents a new control strategy for UPS inverter, which is based on the addition of the DC voltage boost compensation for keeping the fundamental output voltage at the preset value and suppressing the generation of low-order harmonics caused by nonlinear load. This solution involves the combination of a total harmonic distortion (THD) reduction controller and a power factor correction (PFC)...
This paper deals with a harmonic filter to eliminate source current harmonics in power system. It is a combination of shunt passive filter and series active filter. The main section of the active power filter, a voltage source inverter, is connected between AC source and nonlinear load through a series transformer. Current harmonic compensation is achieved by injecting equal fundamental current instead...
In this paper, a new control method for the parallel operation of inverters operating in an island grid or connected to an infinite bus is described. Frequency and voltage control, including mitigation of voltage harmonics, are achieved without the need for any common control circuitry or communication between inverters. Each inverter supplies a current that is the result of the voltage difference...
Harmonic disturbances caused by non-linear loads such as power switching devices often occur in the industrial and commercial power distribution systems and can damage sensitive equipment connected to the systems, causing tremendous productivity loss. This paper presents a novel adaptive-harmonic- detection active filter, consisting of an industry-type power electronic inverter controlled by state-of-the-art...
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