High-Performance Buck-Boost Partial Power Quasi-Z-Source Series Resonance Converter

Abdel‐Rahim, Omar; Chub, Andrii; Maheri, Hamed Mashinchi; Blinov, Andrei; Vinnikov, Dmitri

doi:10.1109/access.2022.3225751

Cited by 7 publications

(2 citation statements)

References 40 publications

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“…Series input parallel output (SIPO) configurations were also demonstrated recently. It could be concluded from the recent literature that SIPO configuration must be implemented with a current-fed dc-dc to provide a peak efficiency of over 99% [21], [22].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Design Requirements and Optimization Possibilities of Partial Power Converter for Photovoltaic String Applications in DC Microgrids

Chub,

Hassanpour,

Yadav

et al. 2024

IEEE Access

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The focus is on partial power converters interfacing photovoltaic strings in dc microgrids.Step-up/down partial power converters were considered for providing the lowest active power processing. This study considers three Si-based photovoltaic modules commonly used in residential applications: 54-, 60-, and 66-cell. Different configurations of photovoltaic strings are analyzed to find at what voltages most energy is generated in hot and cold climates. Combining these results with the operating voltage range of a droop-controlled dc microgrid yields design requirements for the partial power interface converters. The proposed design limits the maximum power the converter processes to optimize its components. Next, the application of the topology morphing control is studied regarding the performance enhancement of partial power converters. Experimental results demonstrate the converter performance in the target operation range and the feasibility of efficiency improvement with the topology morphing control.INDEX TERMS dc-dc converters, dc microgrids, partial power conversion, photovoltaic energy.

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Section: Introductionmentioning

confidence: 99%

Analysis of Design Requirements and Optimization Possibilities of Partial Power Converter for Photovoltaic String Applications in DC Microgrids

Chub,

Hassanpour,

Yadav

et al. 2024

IEEE Access

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“…The qZSI works in Continuous Conduction Mode (CCM) and reduces the stress on the relays and switches [13], [14], [15]. The qZSI has attracted a lot of research interest in improving its performance, both in terms of the power circuit [16], [17] and the control strategies [18], [19]. The development of the power circuit led to an increase in the boost factor.…”

Section: Introductionmentioning

confidence: 99%

Implementation of New Optimal Control Methodology of Quazi Z-Source Inverter Based on MPC

et al. 2023

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Model predictive control (MPC) is a well-known control methodology in power electronics systems, due to its ability to deal with the system's nonlinearities and superior dynamic response. MPC is able to handle multiple variables by adjusting the cost function, but this leads to high computational costs, especially for systems having a big number of switches. This problem increases when not only performance efficiency is required but also minimizing the power losses of these systems. In this paper, a modified MPC algorithm is presented for controlling a three-phase quasi Z-source inverter (qZSI), i.e., providing switching states to be applied for qZSI control, so that, within less computation time, total harmonic distortion (THD) of the output currents is maintained at the minimum level with concurrent minimization of inverter switch power losses. The computational burden is reduced by using calculation loop optimization, reducing the number of switching states in the loop and unrolling the calculation loop. To highlight the effectiveness of the proposed control methodology, a numerical simulation was carried out using MATLAB software. The obtained results have been discussed and compared with those of a recent previous study.INDEX TERMS Model predictive control (MPC), quasi Z-source inverter (qZSI), switching losses, conduction losses, total harmonic distortion (THD).

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Improved vector selection model predictive control strategy for quasi‐Z‐source inverter virtual synchronous generator grid‐connected system

Cheng,

Liu,

Luo

et al. 2024

The Journal of Engineering

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Conventional inverter control methods reduce the grid inertia and are susceptible to parameter variations, resulting in a gradual weakening of grid stability. To address the above problems, an improved vector selection model predictive control strategy is proposed, with virtual synchronous generator technology to control the quasi‐Z‐source inverter. First, the influence of different operating states on the quasi‐Z‐source inverter state variables is analysed, and the established quasi‐Z‐source inverter‐virtual synchronous generator discrete‐time model predicts the input current, output capacitor voltage, and load current of the quasi‐Z‐source inverter network. Second, the inverter switching timing is analysed to establish the optimal switching vector set, and the optimal switching vector set is selected by defining the sub‐objective function, which reduces the average switching frequency of the system. Compared with the finite control set model predictive control, this strategy is to reduce the computation time of the system to obtain the optimal solution of the quasi‐Z‐source inverter, to improve the dynamic responsiveness of the system during the control process, and to improve the power quality. Finally, the effectiveness and correctness of the proposed algorithm are verified by experiments.

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High-Performance Buck-Boost Partial Power Quasi-Z-Source Series Resonance Converter

Cited by 7 publications

References 40 publications

Analysis of Design Requirements and Optimization Possibilities of Partial Power Converter for Photovoltaic String Applications in DC Microgrids

Analysis of Design Requirements and Optimization Possibilities of Partial Power Converter for Photovoltaic String Applications in DC Microgrids

Implementation of New Optimal Control Methodology of Quazi Z-Source Inverter Based on MPC

Improved vector selection model predictive control strategy for quasi‐Z‐source inverter virtual synchronous generator grid‐connected system

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