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In this paper, by extending space vector modulation (SVM) technique to three-phase four-wire systems, a new strategy is developed for the control of active power filters (APFs). It is shown that the conventional SVM method cannot compensate for the current in the neutral wire in a three-phase four wire system. Simulations have been performed using PSCAD/EMTDC software. Simulation results are provided...
In this paper, two shunt active filtering algorithms, namely, synchronous detection technique and newly proposed I.cosϕ algorithm have been simulated and implemented in hardware and a comparison has been brought out. The proposed algorithm is found to work satisfactorily under various system operating conditions. The hardware implementation of both the schemes have been done and the proposed scheme...
To improve the quality of electrical power to the consumers, many power electronic based solutions are available. In the case of active power factor compensation, grid tied voltage source inverter based STATCOM is one of the versatile solution. But in this system most of the control strategies demand generation of unit vector, based on the grid voltage for vector orientation. But presence of harmonics...
In the control strategies for an active power filter, determination of harmonic components of the load current is the most important stage. In this paper the behaviour of the shunt active power filter using the 'nonlinear least squares' estimation technique for extracting the harmonic components of the load current is studied. The performance of active power filter under steady state and dynamic load...
This paper presents a new scheme for parallel hybrid power filter with variable passive part. The proposed model uses a current variable inductor in passive part designed by the software of finite elements method (FEM). The aim of this scheme is reducing power rating of active part of hybrid power filter. To evaluate its performance, this method is simulated by using MATLAB Simulink power system toolbox...
A 1 kWp (peak kilowatt) grid connected photovoltaic (PV) interface is presented. The main functions of that interface are shunt active filtering and VAR compensation of nonlinear load. The controller algorithms are based on maximum power point tracking (MPPT). The indirect current control technique is used. The Matlab simulation shows the validity of the control strategy under environmental and load...
A single-phase AC-to-DC converter using modified series-parallel resonant converter (MSPRC) in conjunction with active power filter (APF) is presented for improvement of power factor on input AC line. The pulsating DC voltage obtained from the single phase uncontrolled diode bridge rectifier is applied to high frequency full bridge configuration of the MSPRC. For high power factor operation small...
This paper describes a new compensating system for the flicker and harmonics generated by a highly-varying load, e.g. a welding machine, connected between two phases of a three-phase system. The proposed system is an active filter with two-phase structure employed in a three-phase system. The system also employs simple and effective control strategies for de-bus regulation and current control. The...
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