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In this article, a photovoltaic (PV)-integrated bidirectional two-winding coupled inductor–based dc-dc converter-fed three-phase four-wire (3P4W) photovoltaic dynamic voltage restorer (PV-DVR) is proposed. The PV interconnected DVR, connected with the power distribution network, effectively compensates the long-term voltage sag, voltage swell, and interruptions. The conventional PV-DVRs designed with the cascaded connection of dc-dc converters offer high boosting gain with increased losses and cost. The proposed PV-DVR based on two-winding coupled inductor–based bidirectional dc-dc converter is designed to provide high boosting gain with increased efficiency and reduced components. The performance of the proposed scheme is validated by simulation using MATLAB/SIMULINK (MathWorks, Natick, MA) and experimentally under different operating conditions. The results show the effectiveness of the proposed topology in mitigating the long-term voltage sag, voltage swell, and interruptions.

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<p>The photovoltaic (PV) power cohort becoming more and more attractive in modern power systems era to meet out the power demand in the globe. Consequently, the extraction of maximum power and reduced power electronics stuff for PV based power generation system research studies are growing continuously to meet out the large power-scale/high-voltage grid-tie demands. In this junction, to improve the efficiency of the existing PV tied Quasi-Z source inverter (QZSI), in this paper the new attempt has proposed here by connecting two batteries across to the QZ capacitors. When a battery connected across each capacitor, this system can deliver power to the load power when the PV panel outputs a variable power with fluctuations. The battery can be charged or discharged without any extra circuit, because of the unique impedance network of QZSI. New PWM techniques and principles are proposed to control the new energy stored QZSI when applied to the PV power system. They can control the inverter output power and manage the battery power simultaneously. The operating principle and power flow of this system are analysed. The Simulated and experimental results through using the planned 0.2-kW prototype validate the proposed analytic model and the design method. In addition, this paper analyzes all of the functioning states for a QZSI and calculates the power loss.</p>