A New Structure of Dynamic Voltage Restorer Based on Asymmetrical 􀄫-source Inverters to Compensate Voltage Disturbances in Power Distribution Networks

Abstract

As a consequence of sensitive, diverse and complex loads in today's distribution networks, improving power quality in distribution systems has attracted great attention. Power quality issues involve voltage sags, transient interrupts and other distortions in sinusoidal waveforms. Enormous methods have been proposed for power quality modification. One of the methods by which power quality problems might be addressed is to apply power electronic devices in the form of custom power devices. One of such devices is Dynamic Voltage Restorer (DVR) which is connected in series to distribution networks. At the same time, through injection of voltage to the network it is able to control voltage amplitude and phase. It is adopted lend to compensate for voltage sags through injecting series and synchronous three phase voltage. Consisted of three single phase inverters and a DC bus, it can protect susceptible loads against various types of voltage sags as well as other disturbances in the power supply. Moreover, it is capable of generating and absorbing active and reactive power. Therefore, in this paper, different structures of DVR have been investigated and eventually proposed a new structure for DVR based on Γ-Source asymmetric inverter. With the proposed structure, severe voltage sags can be retrieved 80-90 percent. The simulation results that obtained by using MATLAB/Simulink indicate the properly functioning of proposed structure. Keyword:Custom power Dynamic voltage restorer Power quality Voltage sag/swell Γ-source inverters

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“…Thus, cos(2 π n f T S k) , sin(2 π n f T S k) are also known. We want calculate a n , b n and v DC [31]. It is observed that number of unknowns is 2N + 1 and that N is the number of harmonics (or the last order harmonic in voltage).…”

PV integrated series active filter for sag voltage and harmonic compensation

“…This phenomenon has another influence on the operation of the application; In addition, it has a direct influence on the supply of sensitive loads. Finally, this has an impact on the electrical power available in the installation because there is overconsumption due to harmonics [4,5]. The serial active filter (SAPF) is used and implanted between the delivery point (PCC) and the load to be protected.…”