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 | IET Power Electronics Volume 17, Issue 1 Pages: 1-181 7 January 2024 |
ORIGINAL RESEARCH
Open AccessBidirectional push–pull/H‐bridge converter for low‐voltage energy storage system
Pages: 1-9 | First Published: 13 September 2023
A bidirectional push–pull/H-bridge DC/DC converter for a low-voltage energy storage system is proposed in this paper. It comprises the push–pull converter, the phase-shifted H-bridge converter, and the transformer.
Open AccessLow‐computation‐burden model predictive current control for the grid‐tied quasi‐Z‐source inverter
Pages: 10-24 | First Published: 07 November 2023
The proposed low-computation-burden model predictive current control greatly reduces the computational burden and eliminates weighting factors.
Open AccessA selection principle of submodule switching state vectors for switching frequency reduction in voltage self‐balancing half‐bridge modular multilevel converters
Pages: 25-37 | First Published: 12 November 2023
In this work, the authors propose a selection principle of submodule switching state vectors based on the voltage self-balancing switching state matrix with lowered submodule switching frequency and device losses. The evaluation indexes of the voltage self-balancing control effect are determined, and the optimized construction method of switching state matrix is presented. The selection principle proposed can effectively reduce switching frequency while meeting the evaluation requirements of practical engineering projects, so as to achieve the balance between switching loss and steady-state capacitor voltage fluctuation.
Open AccessHigh voltage gain switched z‐source inverter with low current stress
Pages: 38-53 | First Published: 27 November 2023
This paper proposes a switched Z-source inverter with high voltage gain and low current stress on elements. Also, a new switching method corresponding to the proposed topology is introduced. This method is based on the usual Maximum Constant Boost (MCB) method. Eliminating part of the inverter's switching in this modulation method improves the inverter's efficiency. In addition to the Shoot-Through (ST) duty cycle, another variable (N) affects the inverter's boost factor in this switching method. The proposed inverter's dynamic analysis shows that introducing N in the modulation method improved the dynamic characteristic of the inverter. For the proposed topology, steady-state analysis, dynamic analysis, elements design and efficiency calculation are performed.
Open AccessFault diagnosis for multiple current sensors in grid‐connected inverter based on average modulation voltage
Pages: 54-66 | First Published: 05 December 2023
Based on the influence of current sensor offset fault in the system, the average modulation voltage value model is established in three-phase stationary coordinates.The difference between the measured value of the current and the actual value is estimated through the model when the offset fault occurs. Experimental results show that this method can accurately locate the fault and perform fault tolerant control when there are offset faults in multiple sensors simultaneously.
Open AccessRobust fault‐tolerant design for LC‐coupling hybrid active power filter
Pages: 67-77 | First Published: 22 November 2023
In this paper, an open-circuit fault-tolerant topology of LC-coupling hybrid active power filter (LC-HAPF) and its control strategy are proposed at the switch level, which can greatly improve the reliability of the system. The proposed structure has a contactor between the midpoint of each bridge arm and the negative bus of the dc-link capacitor.
Open AccessA sliding mode‐based single‐loop control strategy for permanent magnet synchronous motor drives
Pages: 78-91 | First Published: 21 November 2023
A simple control structure with high anti-disturbance ability based on EARL+DOBS is proposed for permanent magnet synchronous motor (PMSM) drives. The speed and current loop (q-axis) are merged into one single-loop controller. An enhanced adaptive reaching law (EARL) is proposed for the single-loop controller, and an improved disturbance observer (DOBS) is developed to enhance the anti-disturbance ability of the PMSM drive.
Open AccessStudy of the decoupling magnetic integrated high‐frequency transformer for DC/DC converter
Pages: 92-106 | First Published: 27 November 2023
In order to reduce the number of discrete transformers and increase the power density as well as the reliability of the power converter, a three-port isolated DC/DC converter with a decoupling magnetic integrated high-frequency transformer (DMIHFT) is proposed for the DC microgrid in this paper. Three discrete transformers are integrated into a single common core, and magnetic decoupling is achieved among each transformer by rational design at the same time.
Open AccessAnalysis and stabilization for full harmonic compensation oscillation in SAPF system with source current direct control
Pages: 107-120 | First Published: 05 December 2023
Modeling and harmonic oscillation analysis for SAPF system with source currrent direct control. Principle of phase adjustment for stabilizing harmonic oscillation in SAPF system. Proposed load current feedforward strategy for stabilization.
Open AccessResearch on adaptive optimal control strategy of virtual synchronous generator inertia and damping parameters
Pages: 121-133 | First Published: 01 December 2023
Based on the technical concept of virtual synchronization, the authors propose a virtual synchronous generator inertia and damping parameters adaptive optimization control strategy; at the same time, in order to adapt to the demand of changing the control strategy for complex working conditions, a multi-mode switching control strategy contains both virtual synchronous control.
Open AccessQuasi‐Z‐source inverter with switched‐coupled‐capacitors
Pages: 134-143 | First Published: 09 December 2023
This paper presents an improved switched-inductor quasi Z-source inverter that has a higher boost factor compared to similar inverters, which integrates a switched-capacitor and a three-winding switched-coupled inductor into a conventional qZSI. The proposed inverter is called a switched-capacitor trans quasi Z-source inverter (SCT-QZSI). In this topology, the input current is continuous, and a high voltage gain is reachable with low duty cycles. In this structure, capacitors are used instead of the side diodes of the switched-inductor quasi Z-source inverter. The proposed converter has a low inrush current at the startup which might damage the converter components. The performance of the proposed inverter is investigated at different operating modes and the voltage and current equations of all elements are calculated. The analysis, derivation of boost factor, capacitor voltages, and components, of the proposed inverter, are carried out and are compared with similar inverters. Finally, to validate its advantages, analytical, simulation, and experimental results are also presented.
Open AccessA new soft‐switching high gain DC/DC converter with bipolar outputs
Pages: 144-156 | First Published: 09 December 2023
This paper introduces a new single-input multi-output (SIMO) step-up DC/DC converter with soft-switching performance and low input current for renewable energy applications. The proposed topology uses a three-winding coupled-inductor (TWCI) and voltage multiplier circuits to achieve high voltage gains.
REVIEW
Open AccessA critical review on contemporary power electronics interface topologies to vehicle‐to‐grid technology: Prospects, challenges, and directions
Pages: 157-181 | First Published: 27 November 2023
Integration of electric vehicles (EVs) with the smart grid system is a potential solution to deal with a large number of EVs. The emerging bidirectional converter topologies to interface EVs and the analysis of promising charging or discharging structures are discussed. Scopes of vehicle-to-grid (V2G) framework and prime barriers in achieving the significant benefits from V2G technology are identified
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