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 | IET Power Electronics Volume 16, Issue 16 Pages: 2625-2800 16 December 2023 |
ORIGINAL RESEARCH
Open AccessAn active clamped L‐L type ZVS current‐fed front‐end DC–DC converter based solid state transformer in grid connected mode PV applications
Pages: 2625-2637 | First Published: 02 October 2023
The presented work utilized a solid-state transformer with an active clamped L-L type current fed front-end converter for maximum power extraction from PV arrays by providing ZVS operation to primary side switches and ZCS operation to secondary side rectifier diodes. Further, the generated power is supplied to non-linear load and utility grid at unity power factor and improved power quality by applying a new fundamental extractor topology titled multi-level cascaded dual double fundamental signal extractor (MCDDFSE) based grid control technique. Finally, the proposed system was trialled on the platform of OPAL-RT (RT-LABv2021.3.2.307) for various grid abnormalities and its behaviour was found well within the IEEE 519 standards.
Open AccessAn improved Buck converter with high frequency and high step‐down ratio for auxiliary power supply applications
Pages: 2638-2649 | First Published: 21 September 2023
An improved Buck converter is proposed for high-frequency and high-step-down-ratio application. With the control method based on energy extraction, the proposed topology can achieve an ultra-low equivalent duty cycle and thus a high step-down ratio under a high switching frequency.
Open AccessA model predictive control of three‐phase grid‐connected current‐source inverter based on optimization theory
Pages: 2650-2665 | First Published: 24 September 2023
For the control under unbalanced and harmonic grids, this paper discusses in detail about the suppression mechanism and specific implementation methods of the proposed method for grid voltage harmonics. Furthermore, the necessary parameters are designed according to the Bode diagram of the control system, and the position map of the closed-loop pole also shows that the proposed method has good anti-disturbance to AC-side inductance parameters. Finally, the simulation and experimental results demonstrate the excellent performance of the proposed method.
Open AccessUltra‐high gain quadratic boost DC–DC converter based on a three‐winding coupled inductor with reduced voltage stress for fuel cell‐based systems
Pages: 2666-2681 | First Published: 24 September 2023
A single-switch non-isolated step-up DC–DC converter based on the conventional quadratic boost converter and a three-winding coupled inductor has been introduced. High boost factor, high efficiency, continuous input current with low ripple, reduced voltage stresses on the switch and power diodes, and a suitable number of elements compared to the obtained gain are the most significant achievements of this topology.
Open AccessDesign of auto‐tuning‐based adaptive controllers for voltage source converters with inductive loads
Pages: 2682-2695 | First Published: 24 September 2023
This paper presents an auto-tuning method for dc–ac voltage source converters (VSCs) with an inductive load that is based on the modified relay feedback test. Controllers tuned by the proposed method can produce near-optimal dynamic performance for dc–ac VSCs without requiring knowledge of the plant's parameters.
Open AccessModel‐free adaptive control for ultracapacitor based three‐phase interleaved bidirectional DC–DC converter
Pages: 2696-2707 | First Published: 27 October 2023
This paper investigates a data-driven based model-free adaptive control approach for a three-phase interleaved bidirectional DC–DC converter (BDC) to improve the robustness and adaptability of the controllers. The suggested control scheme is only based on input–output (I/O) measurement data of three-phase interleaved bidirectional BDC, where any information about the system model is not required, leading to improved robustness against parameter drifts.
Open AccessRefined convolution‐based measures for real‐time harmonic distortions estimation in power system dominated by inverter‐based resources
Pages: 2708-2723 | First Published: 30 September 2023
This paper presents a novel convolution-based approach for real-time estimation of harmonic distortion levels in power networks, addressing the challenges faced by traditional methods such as Total Harmonic Distortion (THD). The proposed method demonstrates superior performance in terms of accuracy, computational efficiency, and sensitivity to deviations in fundamental frequency, offering an effective alternative for monitoring harmonic distortions in steady-state and transient-state scenarios.
Open AccessI–f closed‐loop starting strategy of high‐speed PMSM based on current vector adaptive regulation
Pages: 2724-2738 | First Published: 23 October 2023
The article constructs a numerical solution model for the discrete kinetic model of PMSM based on the Runge–Kutta method, extracts and summarizes the change law of the motor torque angle fluctuation amplitude and frequency with the motor parameters and the reference current vector, proposes a closed-loop I–f startup control strategy for high-speed permanent magnet motors based on current vector adaptive regulation, which enhances the speed tracking performance and current dynamic response for I–f startup control.
Open AccessRobust three‐voltage‐vector‐based model‐free predictive current control for permanent magnet synchronous motor with ultra‐local model
Pages: 2739-2753 | First Published: 12 October 2023
This paper proposes an improved three-vector-based model-free predictive current control strategy to improve the current tracking performance by increasing the number of the applied voltage vectors. Meanwhile, a Hessian matrix based on the cost function is designed to derive the optimal duration of the three voltage vectors.
Open AccessThree‐vector model‐free predictive control for permanent magnet synchronous motor
Pages: 2754-2768 | First Published: 27 October 2023
A three-vector model-free predictive control strategy is proposed to address the problem of model predictive control systems performance degradation caused by parameter mismatch of Permanent Magnet Synchronous Motor and inverter dead-zone.
Open AccessAdaptive inertia and damping of grid‐connected inverter with improved VSG control
Pages: 2769-2781 | First Published: 17 October 2023
By establishing and analyzing the virtual rotor rotation model, an adaptive control algorithm of inertia and damping is proposed from the control mechanism. The Gaussian function of the surface is analyzed, and an intelligent control system is proposed based on an RBF neural network.
Open AccessImplementing a simplified power controller with a direct matrix converter for a PMSG‐based WECS
Pages: 2782-2791 | First Published: 31 October 2023
This work presented an implementation of a wind energy conversion system using a direct matrix converter-permanent magnet synchronous generator topology. When using the singular value decomposition modulation strategy in the power converter, properly controlled power is transferred from the generator to the power grid utilizing a maximum power point tracking strategy.
RAPID COMMUNICATION
Open AccessDesign and implementation of isolated multilevel inverter with lower number of circuit devices
Pages: 2792-2800 | First Published: 16 November 2023
The proposed inverter has the features: A high gain multilevel inverter topology, The number of voltage levels and voltage gain can be configured based on the applications by changing the turn ratio of the transformer. Reduced number of components have been used which has been verified with a comparative analysis with other similar topologies.
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