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RISS 인기검색어
- 검색키워드
- 저자 : Jiarong Kan (검색결과 5 건)
- 무료
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- 유료
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An Improved Inverter-Side Current Feedback Control for Grid-Connected Inverters with LCL Filters
Jinming Xu,Shaojun Xie,Jiarong Kan,Lin Ji 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
The grid-connected LCL-filtered inverter is widely used in distributed power generation systems based on renewable energies. Single inverter-side current feedback control only needs to sample one current to realize both current control and inverter protection. However, with single inverter-side current feedback control, the closedloop system is under-damped or even unstable due to the digital control delay. In this paper, an active damping control based on only inverter-side current feedback is proposed. With the novel control, the resonance in the digitally-controlled LCL-filtered inverter is successfully solved while only inverter-side current is sampled. Comparisons of the proposed and typical single inverterside current feedback control have verified the improvement of the proposed control. Thus, the proposed control has good application prospect in grid-connected LCL-filtered inverters.
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Jinming Xu,Shaojun Xie,Jiarong Kan,Binfeng Zhang 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
For grid-connected LCL-filtered inverter, the inherent resonance of LCL filter endangers the stability so that the inverter is hard to be controlled. To solve the resonance, the capacitor-current-feedback active damping (AD) is welcomed. However, the digital control delay was not seriously considered in the previous studies. The research on the stability with such control considering the digital control delay is lacking. Thus, this paper aims to provide a deep analysis of the capacitor-current-feedback AD in a digitally-controlled inverter. A stable region is derived. It is proved that the stable region for the capacitor-current- feedback AD is closely related to the sampling and computation delay, the control frequency, the resonance frequency and the capacitor-current-feedback factor. Several suitable approaches are then proposed to improve the performance with the capacitor-current-feedback AD. The experimental results verify the presented research.
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Wide-gain boost converter based on LCD cell
Song, Yinghao,Tang, Yu,Kan, Jiarong,Jiang, Lin The Korean Institute of Power Electronics 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.9
A wide-gain boost converter based on LCD cell is proposed in this study. The proposed topology is suitable for the fuel cells of electric vehicles that generate a specific bus voltage in power generation systems. It has none of the drawbacks of other reported LCD cell-based topologies, such as highly pulsating source current, lack of common ground, inverted load voltage polarity, and numerous switching devices. By integrating the classic boost converter with the LCD cell, the voltage gain is improved, and the features of single switch, low voltage and current stress, common ground, and continuous input current are satisfied simultaneously under the condition of using few components. Continuous input current is a desirable characteristic of DC-DC converters that is necessary for practical applications. After working principle and steady-state analyses, the salient features are compared in detail. Then, the performance of the converter and the correctness of the analysis are verified through the results of the experimental prototype.
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Simple symmetric switched inductor high step‑down converter
Yu Tang,Xuran Rong,Jiarong Kan,Yun Zhang,Lin Jiang 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.10
The voltage gain of a traditional buck converter is finite due to the high voltage across the semiconductor and reduced efficiency. A non-isolated high step-down DC–DC converter based on symmetric switched inductors is proposed in this paper. The connection of inductors in series or in parallel is controlled by switches to improve the conversion ratio. The converter has many beneficial characteristics, such as high step-down, reduced voltage stresses, and high efficiency. Moreover, it can realize voltage balance on the switches. The voltage on the switch does not oscillate and the loss of the switches is reduced. Therefore, the efficiency of the whole topology is improved. This paper discusses the operation principle, modes analysis, voltage gain analysis, voltage stress analysis, output ripple analysis, loss analysis, comparative analysis and design considerations. The correctness of the theoretical analysis of the proposed converter is verified by a laboratory prototype, and its peak efficiency reaches 96.5%.
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Jinming Xu,Shenyiyang Bian,Qiang Qian,Jiarong Kan,Shaojun Xie 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
Phase-locked loops (PLLs) are the key technique for inverters to be synchronized with the PCC voltage. Typically, in the single-phase applications, the delaybased PLL is being widely used. However, for nowadays applications where the inverter may be connected to the PCC with large grid impedance, the inverter performance can be endangered, and harmonics or even instabilities are aroused. Although there are some relevant literatures, the solutions for solving the adverse impacts of delay-PLL on the system performance are still not well documented. Therefore, this paper aims to study the limitations of delay-based PLL and provide an improved approach. Through the inverter output impedance modelling, the reason why the delay-based PLL causes the instability in the weak grid case has been clearly explained. Then, the way to solve the instability caused by the PLL has been discussed, and an improved delay-based PLL has been proposed to improve the weak grid compatibility of inverters. The single-phase inverter system can then work well when the grid impedance varies widely.
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