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Due to a large amount of non-linear power electronic equipments, impact and fluctuating loads (such as that of arc furnace, heavy merchant mill and electric locomotive, etc), problems of power quality have become more and more serious with each passing day, as a result Active power filter (APF) gains much more attention due to excellent harmonic compensation. But still the performance of the active...
This paper proposes a generalized hysteresis current controlled three level voltage source inverter (VSI) based single phase shunt active power filter (SAPF). The three level inverter topologies considered in this paper are H-bridge and diode clamped inverters. A generalized hysteresis current control with multiband hysteresis modulation has been used to control the voltage source inverters in the...
Shunt active power filter (SAPF) is suitable to compensate current-type harmonics caused by nonlinear load, but high compensation precision is difficult to be obtained due to very high slew rate of harmonic current, output impendence of voltage source converter (VSC) and control loop phase lag. LCL-filter with high attenuation ratio and small LC parameters is appropriate to be used as output filter...
In this paper, repetitive control is employed to design the current controller of active power filter for reducing the steady-state error due to periodic command. Zero steady-state error for current harmonics is realized. Harmonic reduction and power factor correction will both be carried out by the proposed filter. Discussions on the design of the current and voltage control loops are given. Experimental...
The paper presents the control system of shunt active power filter (APF) with predictive reference current calculation and model based predictive current control. The novel estimator and predictor of grid emf is proposed for AC voltage sensorless operation of APF. Proposed control system provides control of APF current with high precision and dynamics limited only by filter circuit parameters. There...
This paper describes implementation of half- bridge shunt-active power filter incorporating voltage (VCL) and current control loop (CCL) that has resulted with a reduction in the number of switches in use as compared to a typical H-Bridge voltage source inverter topology. The proposed system is connected in parallel with the load and at normal condition it gives appropriate compensation to solve problems...
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