Browsing by Author "Liao, Yi-Hung"

Now showing 1 - 5 of 5

A Novel Control Strategy of Circulating Currents in Parallel Single-Phase Boost Rectifiers
(2012)
Liao, Yi-Hung
;
Chen, Hung-Chi
;
Cheng, Hsiu-Che
;
Lai, Ching-Ming
;
交大名義發表
In this paper, a novel circulating current control scheme of paralleled single-phase boost-type full-bridge converters is proposed. The novel circulating current control scheme doesn\'t require any communication between paralleled converters. Simultaneously, the proposed circulating current control scheme improves the performance of the parallel system and reduces the circulating currents which result from the parallel connection. Based on this control scheme, not only input current shaping of each converter is improved, but also current sharing among paralleled converters is achieved. Both simulation and experimental results verified the validity of the proposed circulating current control scheme.
A Novel Control Strategy of Circulating Currents in Paralleled Single-Phase Boost Converters for Micro-Grid Applications
(2013-01-01)
Liao, Yi-Hung
;
Ke, Yu-Lung
;
Chen, Hung-Chi
;
Cheng, Hsiu-Che
;
交大名義發表
In this paper, analysis of circulating currents of paralleled single-phase boost converter systems is presented. The DC loop and AC loop circulating currents are clearly explained. In order to eliminate the DC loop circulating currents and reduce switching losses, a simplified PWM strategy is adopted in a paralleled single-phase boost converter. Based on the analysis of circulating currents, common mode circulating current (CMCC) and differential mode circulating current (DMCC) are defined. Then, CMCC and DMCC compensator in a centralized control scheme are proposed to reduce the common-mode and differential-mode circulating currents in the parallel system operated in both rectifier mode and inverter mode for micro-grid applications. Some simulation results are carried out to verify the validity of the proposed control scheme. In addition, a prototype system is constructed to facilitate the theoretical results as verification. From simulation and experimental results, the proposed control scheme can indeed reduce the circulating currents under equal and/or different power rating condition in the parallel system.
A Novel Control Strategy of Circulating Currents in Paralleled Single-Phase Boost Converters With Different Power Sharing for Microgrid Applications
(2014-03-01)
Liao, Yi-Hung
;
Chen, Hung-Chi
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Cheng, Hsiu-Che
;
Ke, Yu-Lung
;
Li, Yi-Ta
In this paper, analysis of circulating currents of paralleled single-phase boost converter systems is presented. The dc loop and ac loop circulating currents are clearly explained. In order to eliminate the dc loop circulating currents and reduce switching losses, a simplified pulsewidth modulation strategy is adopted in a paralleled single-phase boost converter. Based on the analysis of circulating currents, common-mode circulating current (CMCC) and differential-mode circulating current (DMCC) are defined. Then, CMCC and DMCC compensators are proposed in a centralized control scheme to reduce the common-mode and differential-mode circulating currents in a parallel system operated in both rectifier and inverter modes with different power sharing for microgrid applications. Converter-paralleled system stability analysis is also presented. Finally, a prototype system is constructed to facilitate the theoretical results as verification. From the experimental results, the proposed control scheme can indeed reduce the circulating currents under equal and/or different power rating conditions in the parallel system.
Common Mode and Differential Mode Circulating-Current Control in Paralleled Single-Phase Boost Rectifiers
(2013)
Liao, Yi-Hung
;
Chen, Hung-Chi
;
Cheng, Hsiu-Che
;
電機工程學系
;
Department of Electrical and Computer Engineering
In this paper, the analysis of circulating currents of a paralleled single-phase boost rectifier system is presented. The DC loop and AC loop circulating currents are clearly explained. Based on the analysis of circulating currents, common mode circulating current (CMCC) and differential mode circulating current (DMCC) are clearly defined. Then, CMCC and DMCC compensators in a centralized control scheme are proposed to reduce the common-mode and differential-mode circulating currents in the parallel rectifier system. Finally, a prototype system is constructed and some experimental results are carried out to verify the validity of the proposed control scheme. From experimental results, the proposed control scheme can indeed reduce the circulating currents under different power rating condition in the parallel system.
Simplified PWM With Switching Constraint Method to Prevent Circulating Currents for Paralleled Bidirectional AC/DC Converters in Grid-Tied System Using Graphic Analysis
(2015-07-01)
Liao, Yi-Hung
;
Chen, Hung Chi
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電機資訊學士班
;
Undergraduate Honors Program of Electrical Engineering and Computer Science
In this paper, a simplified pulsewidth modulation with switching constraint control scheme is proposed to eliminate the circulating currents for bidirectional paralleled ac/dc converters in grid-tied system. The proposed control scheme can reduce the circulating currents and does not need additional current sensors and communication device among paralleled converters compared with conventional methods. Therefore, the paralleled system cost can be reduced. In addition, the current shaping and sharing between the paralleled converters can be well accomplished so that the overall performance of the paralleled converter system can be raised. Furthermore, the dc, ac, and self-generated circulating currents are clearly analyzed by graphics, and the synchronous circulating currents are first explored. Finally, a prototype system is constructed, and the proposed control scheme is implemented using a Spartan-3E XC3S250E FPGA. Both simulation and experimental results verify the validity of the proposed theory and control scheme.