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This paper presents the design of a modified Vienna rectifier for single phase power factor correction (PFC) under RL load. This research proposes a newly developed scheme consist of a modified Vienna rectifier for converting AC to DC, a simple control circuit for controlling single phase modified Vienna rectifier switching, a single phase inverter (H-bridge) for converting power from DC to AC, a...
The development of efficient inverters is crucial to provide a constant supply of energy limited by the intermittency of renewable sources generation in hybrid systems connected to the grid; while maintaining the power quality which is affected due to current harmonics and reactive power. This paper presents a control algorithm based on the theory of passivity that gives an inverter of a photovoltaic...
This paper focuses on Constant Sinusoidal current control strategy based simulation of UPQC (Unified Power Quality Conditioner). The proposed methodology guarantees sinusoidal current to be drawn from the supply system. In addition to this it compensates the reactive power, for which the compensated current and the source voltage are in phase. In case of non-linear loads connected to the system which...
A transformer less hybrid power filter can be used for reactive power compensation and power factor improvement. For optimizing the voltage across the capacitor Adaptive method is used. Control of dc link voltage by Adaptive method is different from fixed method because in this method the voltage is varied in accordance with the loading situation.
In this paper various control techniques for power factor improvement are analyzed and simulated using MATLAB software. Various applications need to regulate the output dc voltage with excellent performance characteristics. Till now the circuitry involved for utility interface was a diode rectifier and a capacitor filter. Thus several agencies had started imposing certain recommendations and standards...
This paper propose an adaptive filter based on continuous time LMS for the distribution static compensator. The Simulink model is constructed in MATLAB software of the complete system along with adaptive control algorithm and rectifier type nonlinear load. It is seen from the test results that the presented LMS adaptive filters accurately estimate the active component weight of the currents from the...
According to increased industrial loads, active power filters have been used a lot to compensate harmonics and reactive load current components. In this paper a new control method with grid power factor control is proposed for three phase active power filters. In the proposed control method the grid current amplitude is calculated based on the well known power balancing method. The phase of this signal...
This paper addresses the comparative study of three phase controlled multi pulse converters used to drive the biomass, gas turbine, hydro, diesel and wind system based power plant which are the viable sources of renewable energy having different nature in respect of speed and voltage This paper approaches the input current shaping of controlled rectifier using multipulse current shaping concept. The...
In this paper a three-phase four-wire (3P4W) unified power quality conditioner (UPQC) under distorted load conditions, the power quality problems are compensate through a new synchronous reference frame (SRF) and hysteresis controller based control method. The proposed UPQC system can improve the power quality at the point of common coupling (PCC). The simulation results based on MATLAB Simulink are...
Active rectifiers are becoming increasingly popular and viable in high-power applications with requirement of bidirectional power flow. This paper presents a resonant current compensator with enhancement of harmonic impedance for LCL-filter based active rectifiers. Together with a fundamental resonant control, an improved harmonic compensator is realized to enhance harmonic impedance as well as reject...
In this paper, a novel control algorithm has been proposed to regulate the DC bus voltage of a single phase shunt active power filter using a fuzzy logic controller. The DC bus voltage of a shunt active power filter should be controlled to compensate the filter losses on the grid. In many industrial applications, a PI controller is generally used to regulate the DC bus voltage of shunt active power...
In this paper, a novel control algorithm for three-phase four-wire shunt active power filter for the compensation of instantaneous harmonic current components in nonlinear loads is presented. Fundamental signal extraction is carried out using Harmonic Tuned Filter (HTF) without the Phase Locked Loop (PLL). HTF can efficiently determine the fundamental signal components from distorted voltage or current...
Nowadays, most of the electrical railway tractions, especially the high-speed tractions are using AC-DC-AC power driving system. The best choice for the AC-DC link is four-quadrant PWM rectifier, which can provide controllable DC link voltage and better power factor for the grid. In high power drive applications, the switch frequency of the power semiconductor device cannot be very high, usually less...
Increasing non-linear loads cause various undesirable effects and power quality problems on utility supply, like low system efficiency, poor power factor, derating of power supply equipments, disturbance to other consumers and interference in nearby communications networks etc. This work proposes a parallel power processing scheme to improve the power quality of uncontrolled diode bridge rectifier...
This paper proposes a modification on the Hybrid Active Series Filter (HASF) creating a topology named Hybrid Active Var Compensator (HAVarC) suitable to manipulate, in continuous way, the displacement power factor or voltage regulation. The HAVarC is composed by a small rating Active Power Filter (APF) in series with a capacitor bank. The main objective of this topology is to control the reactive...
The paper presents a family of novel switched smart filter compensated devices using Green Plug Smart Filter Soft Starter GP-SF-SS devices for small single phase induction motors. GP-SF-SS devices are equipped with a dynamic online error driven optimally tuned controller that ensures improved power factor, reduced feeder losses, stabilized voltage, minimal current ripples and efficient energy utilization/conservation...
This paper proposes the Unified Hybrid Power Quality Conditioner (UHPQC). The proposed topology manipulates, at the same time and in continuous way, the displacement power factor and also it mitigates the dominant harmonic component of the line current. The structure is composed by a small rating Active Power Filter (APF) in series with a single passive filter. The main objective of this topology...
In this paper a simple single-stage single-switch input-current shaping (S4ICS) circuit was designed, simulated and tested for AC/DC converter which generates input current harmonics due to its non-linear characteristics. A sinusoidal input current with nearly unity distortion factor was achieved through current harmonics mitigation by using PWM boost regulator. The circuit utilizes the charging and...
In this paper, the principle of Static Var Compensator (SVC) is analyzed in detail, and a kind of SVC system which consists of Thyristor Controlled Reactors (TCR) and Fixed Capacitor (FC) is designed. Bridge rectifier and L-R circuit is used to simulate the symmetrical three-phase load. Based on instantaneous reactive power theory, the SVC system signals are detected rapidly and precisely. In order...
The mathematical and simulation model of three-phase voltage source rectifier (VSR) used in aircraft is introduced in this paper. Based on the model, the principle of the seven-segment space vector pulse-with modulation (SVPWM) control strategy is presented. The double closed-loop control method is applied in the PWM rectifier. The rectifier can realize unity power factor by adopting the fixed switching...
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