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- 저자 : Maoh-Chin (검색결과 4 건)
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A Soft-Switching Three-Phase DVR Equipped With a High-Frequency Isolated Converter
Maoh-Chin Jiang,Bing-Jyun Shih,Yu-Kai Lin 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper proposes a soft-switching three-phase dynamic voltage restorer (THDVR) equipped with a highfrequency isolated converter. The proposed THDVR can keep the output voltage stable even under wide variations of voltage source. Besides, using simple resonant units, all main switches are turned on at zero-voltage-switching (ZVS). Also, all auxiliary switches are turned off at zero-current-switching (ZCS). The proposed topology can greatly reduce switching losses, and EMI. Moreover, replacing three low-frequency isolation transformers by a high-frequency isolated converter, the volume, weight and cost of the proposed THDVR can be reduced significantly. After all, some simulation results are presented to demonstrate the performance of the proposed softswitching THDVR.
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A Modular Three-Phase Voltage Regulator With Fictitious DC-Link
Maoh-Chin Jiang,Yi-Ru Jiang,Tai-Chun Liu 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
A modular three-phase voltage regulator with a fictitious dc-link is proposed. The proposed scheme is the combination of three single-phase modules while each one of the single-phase module is a three-leg ac voltage regulator. Therefore, the proposed voltage regulator reduces the number of main switches and compensates the voltage of each phase independently. Furthermore, a small film ac capacitor is used to replace the electrolytic capacitor, which not only reduce the size of the dc link capacitor and the stress of the switches but also increase the lifetime of the voltage regulator. The proposed scheme can compensate the voltage disturbance such as under-voltage, over-voltage, voltage sag, voltage swell, three-phase voltage unbalance and three-phase load unbalance effectively. Besides, there are several advantages of this structure, for instance: simple system-configuration, rapid voltage-compensation, easy setup-maintenance and decreasing the production cost while increasing the system power density. Eventually, some experimental results are provided to illustrate the steady-state characteristics and transient responses of the proposed modular three-phase voltage regulator.
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A Novel Three-Phase Voltage-Doubler Soft-Switching Active Filter
Maoh-Chin Jiang,Jing-Jhu Jhan,Kuei Wu-Chang,Huang-Kai Fu 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
A novel three-phase voltage-doubler soft-switching active filter (VDSSAF) comprising four main switches and four auxiliary switches is proposed in this paper. All main switches in the proposed VBSSAF operate at zero-voltage-switching (ZVS) turn on, while the auxiliary switches operate at zero-current-switching (ZCS) turn off. The reduction in the number of switches can also increase the reliability, since the control circuits are thereby reduced to two sets. The proposed VBSSAF can compensate the current harmonics, improve the power factor and balance the unbalanced nonlinear load. Moreover, a critical value of the capacitor voltage magnitude on the DC side and a critical value of the reactor inductance on the AC side for successful harmonic current tracking are also derived for design applications. Some experimental results of the VBSSAF, rated 400 W and operated at 40 ㎑, are provided to demonstrate the performance.
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A Novel Single-Phase Soft-Switching Unipolar PWM Inverter
Maoh-Chin Jiang,Wei-Shiang Wang,Huang-Kai Fu,Kuei Wu-Chang 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
A novel single-phase soft-switching unipolar PWM inverter (SSUPI) using a simple auxiliary resonant unit is proposed. All main switches of high-frequency arm operate at zero-voltage-switching (ZVS) turn-on, while the auxiliary switches operate at zero-current-switching (ZCS) turn-off. All main switches of low-frequency arm operate at 60 ㎐ to greatly reduce switching losses. As a result, commutations of the main power devices occur with low losses. Consequently, higher efficiency is achieved. Moreover, a unipolar PWM scheme is used to reduce the output voltage harmonics. Some experimental results of the proposed SSUPI, rated 500 W and operated at 40 ㎑, are presented for demonstration.
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