Abstract
In this paper, dynamic voltage restorer (DVR) compensation methods are compared to each other for the load side connected shunt converter topology of z-source inverter based DVR to choose the best method. Four different topologies are recognized for DVR that two of them have energy storage devices, and two topologies have no energy storage that take ener\-gy from the grid during the period of compensation. Here the load side connected shunt converter topology that takes necessary energy from the grid is used. Pre-sag compensation, in-phase compensation, energy-optimized methods are the three DVR compensation methods that studied and compared. A deep analysis through different diagrams would show the advantages or disadvantages of each compensation method. Equations for all methods are derived and the characteristics of algorithms are compared with each other. The simulation results done by SIMULINK/ MATLAB shows compensating by this topology based on the compensation methods.
Highlights
Power quality has obtained more attention in recent years due to growth in using industrial sensitive loads [1]
Voltage sag is one of the most important power quality issues that occur in the shape of sudden voltage fall, which happens greatly due to short circuit fault
dynamic voltage restorer (DVR) consists of a converter, energy storage device and a transformer to inject the appropriate voltage to clear the power quality problems
Summary
Power quality has obtained more attention in recent years due to growth in using industrial sensitive loads [1]. DVR consists of a converter, energy storage device and a transformer to inject the appropriate voltage to clear the power quality problems. All compensation methods include pre-fault, in-phase, and energy optimized compensation algorithm are analyzed and compared in this paper for the Z-source inverter based DVR.
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