New Hybrid Structure Based on Improved Switched Inductor Z-Source and Parallel Inverters for Renewable Energy Systems

Zakerian, Ali; Nazarpour, Daryoush

doi:10.11591/ijpeds.v6.i3.pp636-647

Cited by 8 publications

(3 citation statements)

References 27 publications

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“…Inductors, capacitors and diodes are to be added to the original ZSI to produce high DC link voltage for the main power circuit from a very low input DC voltage and also to improve the boost factor [21]- [24]. SL-QZSI gives a substantial boost inversion compared to classical ZSI/QZSI [25].…”

Section: Switched-inductor Quasi-z-source Inverter (Sl-qzsi)mentioning

confidence: 99%

Quasi-Z-Source Inverter Topologies with Reduced Device Rating: a Review

Rajan¹,

Premalatha²

2017

IJPEDS

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Quasi-Z-Source Inverter (QZSI) has introduced a new wave of interest in engineering industry and research. Reduction in device rating has been the main objective in introducing QZSI topologies. The introduced topologies in QZSI have proven to be feasible in a wide range for high power with medium voltage applications. This paper mainly focuses on QZSI topologies with continuous input current conduction and also power conditioning in the renewable energy system. Based on a detailed comparison of these topologies suitable QZSI can be arrived for a given application. Keyword:Continuous input current Quasi Z-Source inverter Reduced device rating Copyright © 2017 Institute of Advanced Engineering and Science.All rights reserved. Corresponding Author:Premalatha L., School of Electrical Engineering, VIT University, Chennai -600 027, India. Email: premalatha.l@vit.ac.in INTRODUCTIONQuasi-Z-Source Inverter (QZSI) is derived from the original Z-Source Inverter (ZSI) where it can be utilized to all power converters i.e., DC-AC, DC-DC, AC-DC, AC-AC. ZSI can operate in boost inverter or buck inverter but not as buck-boost inverter [1]- [3].By introducing QZSI some of the disadvantages in traditional ZSI can be overcome. The QZSI has the wide range of applicability in the renewable energy system, where it gives a single stage power conversion with buck-boost characteristics and improve the reliability of the inverter [4]- [8]. In shoot through states, both power switches in a leg are turned on at the same time and it is used to step up the voltage and the output voltage in QZSI can be boost to designed value. Research based on these QZSI has concentrated on modelling and control, photovoltaic and other electrical applications. The QZSI can buck and boost the input voltage in single stage with two control variables; shoot through and modulation index. New topologies of QZSI which has been derived from original ZSI can be proposed for PV applications, because of continuous input current and reduced capacitor rating. QZSI has a prescribed application to combine with renewable energy system for a wide voltage range to distribute for power grid [9]- [12].Moreover, the voltage stress on capacitors and current stress on inductors and diodes in QZSI are lower than traditional ZSI for same input and output voltage. QZSI avoids inrush current at starting, where destroy of the devices can be avoided and also these topologies are more viable for solar cell and fuel cell applications it may acquire high voltage gain to match the source voltage difference [13], where for the same input and output voltages, it can use lower duty cycle and higher modulation index, which results in less switching stresses, better output power and lower input current ripple. The advantage of including inductors in the QZSI network will limit the current ripple through the devices during boost conversion mode.

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Section: Switched-inductor Quasi-z-source Inverter (Sl-qzsi)mentioning

confidence: 99%

Quasi-Z-Source Inverter Topologies with Reduced Device Rating: a Review

Rajan¹,

Premalatha²

2017

IJPEDS

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“…The hybrid structure of power converters may yield noticeable advantages that can address these problems [8][9][10]. An effective idea to augment the converter power capacity is the combination of matrix and three-level converters.…”

Section: Introductionmentioning

confidence: 99%

An Improved Model Predictive Control Method to Drive an Induction Motor Fed by Three-Level Diode-Clamped Indirect Matrix Converter

Farhadi

Akbari

Zakerian

et al. 2020

Int. j. eng. technol. innov.

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In this paper, an improved model predictive control method is proposed to drive an induction motor fed by a three-level matrix converter. The main objective of this paper is to present a novel method to increase the switching frequency at a constant sampling time. Also, it is analytically discussed that increasing the switching frequency not only can decrease the motor current ripples, but it can also significantly reduce its torque ripples. Finally, this study demonstrates that reducing the motor current ripple will improve the quality of the supply current. To be the accurate model and validate the motor drive system, a co-simulation method, which is a combination of FLUX and MATLAB software packages, is employed to find the simulation results. The findings indicate that the proposed method diminishes the THD of the supply current up to 26% approximately. Furthermore, increasing the switching frequency results in the torque ripple reduction by up to 10% almost.

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“…This strategy requires two converters, controllers and feedback responses. As a solution, a single-stage Z-source inverter (ZSI) based on one power circuitry generation has been proposed to overcome these drawbacks appeared in the common voltage and current source inverter based on [4].…”

Section: Introductionmentioning

confidence: 99%

i-Capacitor Voltage Control for PV Z-source System with Enhanced Shoot-through

Sham

Zulkifli

Jackson

2018

IJPEDS

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This paper explains an improved capacitor voltage control (i-CVC) by combining with maximum power point tracking (MPPT) algorithm as a control strategy for a single-phase Z-source inverter (ZSI) using photovoltaic (PV) source. The existing CVC based-MPPT control algorithm has a net shoot-through interval which should be inserted in the switching waveforms of the inverter to produce maximum power at the Z-network of the PV. However, this net shoot-through period is formed by an additional shoot-through period which has drawbacks as it boosts the capacitor voltage to a greater extent beyond the allowable voltage boundary of the capacitor. İn other words, the PV will boost the voltage more than the desired level as per required by reference capacitor voltage of the Z-network. Due to this problem, an improved capacitor voltage control (i-CVC) with general Perturb and Observe (P&O) based on ΔT0’ configuration of the changes shoot-through duty cycle to maintain the DC-link of the ZSI is introduced and been tested in simulation case with a resistive load. At the end, this modification able to assist the MPPT output power by increasing the overall system effectiveness of power generation by the PV.

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New Hybrid Structure Based on Improved Switched Inductor Z-Source and Parallel Inverters for Renewable Energy Systems

Cited by 8 publications

References 27 publications

Quasi-Z-Source Inverter Topologies with Reduced Device Rating: a Review

Quasi-Z-Source Inverter Topologies with Reduced Device Rating: a Review

An Improved Model Predictive Control Method to Drive an Induction Motor Fed by Three-Level Diode-Clamped Indirect Matrix Converter

i-Capacitor Voltage Control for PV Z-source System with Enhanced Shoot-through

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