Simulation analysis of improved quasi resonant inverter by using Space Vector Modulation technique
01 Feb 2017-pp 1-6
TL;DR: In this article, a new quasi resonant inverter called Switched-coupled-inductor quasi Z-Source Inverter (SCL-qZSI) is introduced.
Abstract: Z-Source inverter has become main aspect for buck and boost inversion, where the boost gain is limited due to more component voltage sag and swell are high. To avoid these new quasi resonant inverter called Switched-coupled-inductor quasi Z-Source Inverter (SCL-qZSI) is introduced. This SCL-qZSI adds one capacitor, coupled inductor and two diodes compare to traditional qZSI. Switching stress can be minimized by obtaining a optimized capacitor voltage. By using Space Vector Modulation technique a comparison in terms of harmonic distortion (THD), voltage gain and boost factor results are validated. To prove the advantages of SCL-qZSI over qZSI Simulation analysis are being presented.
References
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TL;DR: The Z-source converter employs a unique impedance network to couple the converter main circuit to the power source, thus providing unique features that cannot be obtained in the traditional voltage-source (or voltage-fed) and current-source converters where a capacitor and inductor are used, respectively.
Abstract: This paper presents an impedance-source (or impedance-fed) power converter (abbreviated as Z-source converter) and its control method for implementing DC-to-AC, AC-to-DC, AC-to-AC, and DC-to-DC power conversion. The Z-source converter employs a unique impedance network (or circuit) to couple the converter main circuit to the power source, thus providing unique features that cannot be obtained in the traditional voltage-source (or voltage-fed) and current-source (or current-fed) converters where a capacitor and inductor are used, respectively. The Z-source converter overcomes the conceptual and theoretical barriers and limitations of the traditional voltage-source converter (abbreviated as V-source converter) and current-source converter (abbreviated as I-source converter) and provides a novel power conversion concept. The Z-source concept can be applied to all DC-to-AC, AC-to-DC, AC-to-AC, and DC-to-DC power conversion. To describe the operating principle and control, this paper focuses on an example: a Z-source inverter for DC-AC power conversion needed in fuel cell applications. Simulation and experimental results are presented to demonstrate the new features.
2,851 citations
"Simulation analysis of improved qua..." refers methods in this paper
...ZSI are used to shoot-through the inverter arms and boost voltage [1]....
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TL;DR: In this article, a maximum boost control method for the Z-source inverter is presented to produce the maximum voltage boost under a given modulation index, and the relationship of voltage gain versus modulation index and voltage stress versus voltage gain is analyzed in detail and verified by simulation and experiment.
Abstract: This paper explores control methods for the Z-source inverter and their relationships of voltage boost versus modulation index. A maximum boost control is presented to produce the maximum voltage boost (or voltage gain) under a given modulation index. The control method, relationships of voltage gain versus modulation index, and voltage stress versus voltage gain are analyzed in detail and verified by simulation and experiment.
769 citations
"Simulation analysis of improved qua..." refers background in this paper
...In PWM techniques like, Maximum boost control [7], Constant boost control [8] and Simple boost control has the drawback of high frequency and additional switching losses....
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TL;DR: In this article, the authors proposed two constant boost control methods for the Z-source inverter, which can obtain maximum voltage gain at any given modulation index without producing any low-frequency ripple that is related to the output frequency and minimize the voltage stress at the same time.
Abstract: This paper proposes two constant boost-control methods for the Z-source inverter, which can obtain maximum voltage gain at any given modulation index without producing any low-frequency ripple that is related to the output frequency and minimize the voltage stress at the same time. Thus, the Z-network requirement will be independent of the output frequency and determined only by the switching frequency. The relationship of voltage gain to modulation index is analyzed in detail and verified by simulation and experiments.
685 citations
21 Jun 2010
TL;DR: These new networks exhibit some unique advantages, such as the increased voltage gain and reduced voltage stress in the voltage-fed trans-ZSIs and the expanded motoring operation range in the current- fed trans- ZSIs, when the turns ratio of the transformer windings is over 1.
Abstract: This paper extends the impedance-source (Z-source) inverters concept to the transformer based Z-source (trans-Z-source) inverters. The original Z-source inverter (ZSI) employs an impedance network of two inductors and two capacitors connected in a special arrangement to interface the dc source and the inverter bridge. It has overcome the conceptual limitations of the traditional voltage-source inverter and the current-source inverter. In the proposed trans-Z-source inverters, the impedance network consists of a transformer and one capacitor. While maintaining the main features of the previously presented Z-source network, the new networks exhibit some unique advantages, such as the increased voltage gain in the voltage-fed trans-ZSIs and the expanded motoring operation range in the current-fed trans-ZSIs when the turns-ratio of the transformer windings is over 1. Simulation and experimental results of one of the voltage-fed trans-Z-source inverters are provided to verify the analysis.
354 citations
TL;DR: In this article, a switched-coupled-inductor quasi-Z-source inverter (SCL-qZSI) is proposed, which integrates a switch-capacitor and a three-winding switched-Coupled Inductive inductor into a conventional qZSI.
Abstract: Z-source inverters have become a research hotspot because of their single-stage buck–boost inversion ability, and better immunity to EMI noises. However, their boost gains are limited, because of higher component-voltage stresses and poor output power quality, which results from the tradeoff between the shoot-through interval and the modulation index. To overcome these drawbacks, a new high-voltage boost impedance-source inverter called a switched-coupled-inductor quasi-Z-source inverter (SCL-qZSI) is proposed, which integrates a switched-capacitor and a three-winding switched-coupled inductor (SCL) into a conventional qZSI. The proposed SCL-qZSI adds only one capacitor and two diodes to a classical qZSI, and even with a turns ratio of 1, it has a stronger voltage boost-inversion ability than existing high-voltage boost (q)ZSI topologies. Therefore, compared with other (q)ZSIs for the same input and output voltages, the proposed SCL-qZSI utilizes higher modulation index with lower component-voltage stresses, has better spectral performance, and has a lower input inductor current ripple and flux density swing or, alternately, it can reduce the number of turns or size of the input inductor. The size of the coupled inductor and the total number of turns required for three windings are comparable to those of a single inductor in (q)ZSIs. To validate its advantages, analytical, simulation, and experimental results are also presented.
129 citations
"Simulation analysis of improved qua..." refers background or methods in this paper
...1 [12] where the start up inrush current will suppress capacitor C2 will absorb the energy stored in leakage inductance....
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...Therefore, for the same voltage conversion ratio [12], the SCL-qZSI makes use of the larger modulation compared to qZSI, where the modulation index is 0....
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