Abstract
The design, simulation and implementation of modified diode assisted extended boost q-ZSI (MDAEB q-ZSI) for photovoltaic application are proposed in this paper. It is the most efficient topology that provides a single stage conversion for PV systems by providing high input voltage gain, reduced number of components count, increased voltage boost property, reduced voltage ratings, reduced voltage stress across the switches and simplified control strategies. Its unique capability in single stage conversion with improved voltage gain is used for voltage buck and boost function. The operating modes and the steady state theoretical analysis of voltage boost, control methods and a system design guide for the proposed topology are investigated in this paper. A simulation model of the PV system based on MDAEB q-ZSI has been built in MATLAB/ SIMULINK. Performance parameters such as Total harmonic distortion (THD), voltage gain, voltage stress and boost factor are computed and compared with the conventional quasi z-source inverter. The prototype model for MDAEB q-ZSI is developed and the results are validated.
Highlights
In standalone PV systems, the power electronic converters play a vital role in the conversion of DC current of PV panels into AC to supply the load, with maximum efficiency and superior performance
The modified diode assisted extended boost quasi-Z-source inverter has a single power conversion stage which perfectly suits for interfacing of renewable energy sources
From the simulation results it is observed that Modified Diode Assisted Extended Boost (MDAEB) q-ZSI gives higher RMS value of the output voltage, higher voltage gain, increased boost factor, reduced voltage stress and reduced Total harmonic distortion (THD) when compared with the traditional quasi ZSI for the simple boost modulation technique
Summary
In standalone PV systems, the power electronic converters play a vital role in the conversion of DC current of PV panels into AC to supply the load, with maximum efficiency and superior performance. (2016) Modified Diode Assisted Extended Boost Quasi Z-Source Inverter for PV Applications. The modified diode assisted extended boost quasi-Z-source inverter has a single power conversion stage which perfectly suits for interfacing of renewable energy sources. The efficiency and the voltage gain of the conventional q-ZSI are limited and comparable with the traditional system of a voltage source inverter with the auxiliary step-up DC/DC converter in the input stage [2] [3]. The concept of extending the quasi ZSI gain without increasing the number of active switches has been reported in the literature [4] [5] These new converter topologies are known as extended boost q-ZSI and can be generally classified as capacitor assisted, diode assisted topologies and hybrid topologies [5] [6]. Hardware of the modified diode-assisted QZSI is developed and the simulation results are verified
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