Conference Papers
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Item A Novel Three-Phase Low Voltage (LV) Dynamic Voltage Restorer (DVR) Employing Semi-Z-Source Inverter(IEEE Computer Society help@computer.org, 2018) Remya, V.K.; Parthiban, P.; Nandakumar, A.; Ansal, V.This paper presents the design and control of a Low Voltage (LV) Dynamic Voltage Restorer (DVR) for a three-phase power system. The DVR is designed to protect a three-phase load of 3 kVA from the voltage sags and swells ranging up to 0.5 p.u of the supply voltage. The proposed DVR utilizes semi-Z-source (SZS) inverter as the power converter in each phase of the DVR. The SZS inverter offers many advantages such as reduction in cost, size, weight, elimination of filter etc. compared to the conventional Full Bridge (FB) inverter based DVR. Each phase is controlled independently which offers mitigation of both symmetrical and asymmetrical sags. The proposed DVR employs the modified feedback control technique. The simulation results from MATLAB/Simulink environment verify the efficacy of the proposed DVR topology. The proposed DVR topology is suitable for mitigation of sags and swells initiating at any point-on-wave. © 2018 IEEE.Item Buck-Boost Inverter Functionality of Two-Phase Semi-Z-Source Converter(Institute of Electrical and Electronics Engineers Inc., 2018) Remya, V.K.; Parthiban, P.; Ansal, V.; Nandakumar, A.A two-phase semi-Z-source (SZS) inverter capable of generating sinusoidal output voltage up to two times the input voltage is discussed in this paper. The two-phase SZS inverter consists of four switches and two Z-source networks. The buck-boost functionality achieved without the presence of shoot-through phenomenon is the major advantage of the two-phase SZS inverter. In the two-phase SZS inverter structure, there are two blocks of single-phase SZS circuits. Each single-phase SZS inverter block consists of two switches and one Z-source network. In each SZS inverter block, the switches are operated complementarily. The voltage gain of the single-phase SZS circuit block is non-linear in nature and a Modified Sinusoidal Pulse Width Modulation (MSPWM) technique is employed for generating the switching pulses. The MATLAB/Simulink results are presented to demonstrate the characteristics of the two-phase SZS inverter. © 2018 IEEE.Item A comparative study of full-bridge inverter based DVR and SEMI-Z-source inverter based DVR(Institute of Electrical and Electronics Engineers Inc., 2018) Remya, V.K.; Parthiban, P.; Nandakumar, A.There is always a necessity to protect the voltage sensitive industrial systems from Power Quality (PQ) issues to prevent the loss of product quality and revenue. Generally, custom power devices take the responsibility to mitigate these PQ problems, restore the voltage and thus maintain the PQ standards. Dynamic Voltage Restorer (DVR) is one among the custom power devices which offers an economical compensation of load voltage under abnormal supply voltage conditions. The voltage injected in series by the DVR compensates the load profile during PQ events; appropriate voltage injected by the DVR in series with supply protects the load and restores the voltage to pre-defined values. The required injected voltage is generated by the inverter circuit in the DVR system. The most commonly used DVR inverter is the full-bridge inverter which consists of four switches. The Semi-Z-Source (SZS) inverter based DVR which offers same injection capability with only two-switches is compared with the full-bridge inverter. The in-phase compensation technique is employed in both the DVRs for injecting required voltage into the grid. The efficiency, quality of the injected voltage and load voltage are studied. This paper presents simulation results in MATLAB/Simulink environment to validate thecomparison. © 2018 IEEE.