scispace - formally typeset
Search or ask a question
Proceedings ArticleDOI

Controller design for a quasi z source dc-dc converter for solar application

01 Jul 2016-pp 1-6
TL;DR: In this article, the authors proposed a converter along with its closed loop control that can be used along with the renewable sources like photovoltaic modules to provide boost or buck action in single action.
Abstract: The increasing demand of renewable energy is increasing everybody's interest towards the converter to be used in the system. This paper proposes a converter along with its closed loop control that can be used along with the renewable sources like photovoltaic modules. The proposed converter has the capability to provide boost or buck action in single action. Different modes of the converter are discussed and a closed loop controller for the converter is proposed. The closed loop controller proposed for the converter is based on the use of logic combinations. The simulation results of the closed loop system are realized using PSIM software.
References
More filters
Journal ArticleDOI
10 Dec 2002
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

Proceedings ArticleDOI
15 Jun 2008
TL;DR: In this paper, theoretical results are shown for several novel inverters, which are similar to the Z-source inverters presented in previous works, but have several advantages, including in some combination; lower component ratings, reduced source stress, reduced component count and simplified control strategies.
Abstract: In this paper, theoretical results are shown for several novel inverters. These inverters are similar to the Z-source inverters presented in previous works, but have several advantages, including in some combination; lower component ratings, reduced source stress, reduced component count and simplified control strategies. Like the Z-source inverter, these inverters are particularly suited for applications which require a large range of gain, such as in motor controllers or renewable energy. Simulation and experimental results are shown for one topology to verify the analysis. Also, a back-to-back inverter system featuring bidirectionality on both inverters, as well as secondary energy storage with only a single additional switch, is shown.

1,031 citations

Journal ArticleDOI
TL;DR: In this article, a Z-source inverter system for a split-phase grid-connected photovoltaic system is proposed, and the operation principle, control method, and characteristics of the system are presented.
Abstract: This paper proposes a Z-source inverter system for a split-phase grid-connected photovoltaic system. The operation principle, control method, and characteristics of the system are presented. A comparison between the new and traditional system configurations is performed. Simulation and experimental results are also shown to verify the proposed circuit and analysis

500 citations

Journal ArticleDOI
TL;DR: This paper presents new step-up dc/dc converter topologies intended for distributed power generation systems and describes the operation principles of the proposed topologies and analyzes the theoretical and experimental results.
Abstract: This paper presents new step-up dc/dc converter topologies intended for distributed power generation systems. The topologies contain a voltage-fed quasi-Z-source inverter with continuous input current on the primary side, a single-phase isolation transformer, and a voltage doubler rectifier (VDR). To increase the power density of the converter, a three-phase auxiliary ac link (a three-phase inverter and a three-phase isolation transformer) and a three-phase VDR are proposed to be implemented. This paper describes the operation principles of the proposed topologies and analyzes the theoretical and experimental results.

388 citations

Journal ArticleDOI
TL;DR: Detailed modeling and control issues of the qZSI used for distributed generation (DG), such as PV or fuel cell power conditioning, are addressed and constant capacitor voltage control method is proposed in a two-stage control manner.
Abstract: The voltage-fed Z-source inverter/quasi-Z-source inverter (qZSI) has been presented suitable for photovoltaic (PV) applications mainly because of its single-stage buck and boost capability and improved reliability. This paper further addresses detailed modeling and control issues of the qZSI used for distributed generation (DG), such as PV or fuel cell power conditioning. The dynamical characteristics of the qZSI network are first investigated by small-signal analysis. Based on the dynamic model, stand-alone operation and grid-connected operation with closed-loop control methods are carried out, which are the two necessary operation modes of DG in distributed power grids. Due to the mutual limitation between the modulation index and shoot-through duty ratio of qZSI, constant capacitor voltage control method is proposed in a two-stage control manner. Minimum switching stress on devices can be achieved by choosing a proper capacitor voltage reference. Experimental results are presented for validation of the theoretical analysis and controller design.

362 citations