Selection of proper reference compensation current extraction scheme plays the most crucial role in the performance of an active power filter (APF). This paper mainly describes three different control schemes used in APFs namely, Conventional instantaneous active and reactive power (p–q), Modified p–q, and Instantaneous active and reactive current component (id–iq) schemes. Our objective here i...

The current control is an important issue in power electronic circuits, particulary in dc to ac inverters which are used in ac motor drives and continuous ac power supplies where the objective is to produce a sinusoidal ac output whose magnitude and frequency can both be controlled. In this paper, the current control of three-phase pulse width modulated voltage source inverter (PWM-VSI) has bee...

1. Types of Electric Networks 1.1 Definitions for Active and Passive Components 1.2 Alternative Definitions 1.2.1 Modeling a Capacitor 1.2.2 Modeling an Inductor 1.2.3 Alternative Definition of Active Circuits 1.3 Active Circuits in Power Electronics 2. Active Filters 2.1 Voltage Source Inverter (VSI) as Active Filter 3. Power in Three Phase Systems 3.1 Alternative Expressions 3.2 Active Filter...

<span lang="EN-US">This paper presents a new control strategy based on the combination between resonant controller and disturbance-observer (RSCDO) for stand-alone four-leg Voltage Source Inverter (VSI). The aim of is to regulate inverter output voltage, reducing as much possible voltage Total Harmonic Distortion (THDv) in every load condition. allows adjust fundamental harmonic, whereas ...

This paper presents a new three-phase four-leg voltage source inverter (VSI), which achieves a high cost effectiveness for mega-watt level system applications. The proposed four-leg inverter adopts the integrated topology with thyristors and insulated-gate bipolar transistors (IGBTs), which aims to reduce the number of IGBTs. In order to handle the zero sequence current, a neutral leg via incor...

Voltage source inverter (VSI) fed induction motors are widely used in variable speed applications. The harmonic distortion in the line currents of the inverter depends on the switching frequency and the pulse width modulation (PWM) technique employed to switch the inverter. The inverter switching loss is also strongly influenced by the PWM technique used. This paper compares the harmonic distor...

The proposed paper deals with steady state estimation of a electromagnetic torque ripples and a current waveform of a two-phase induction motor (IM), which is supplied by an three-leg voltage source IGBT bridge connected inverter (VSI). The complex Fourier series analysis of the inverter’s output voltage was made, to obtain an analytical formula of supply voltage waveform. The space phasor theo...

This paper deals with an indirect current controlled shunt active power filter (SAPF) for improving power quality by reactive power compensation and harmonic filtering. The presence of harmonics and reactive power in the power source because it will cause additional power losses and malfunctions. The proposed APF is based on a voltage source inverter (VSI). The VSI is controlled by two loops, t...

Now-a-days for effective load compensation, a conventional three-level neutral point clamped (CNPC) inverter topology is more preferably used. This compensator, however, faces the problems of additional clamping diodes, which reduces the redundant switching states and improves the problem of capacitor voltage imbalance; further increasing the inverter cost. In this paper, a detailed analysis of...