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- 저자 : Xianggen Yin (검색결과 4 건)
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Lei, Ertao,Yin, Xianggen,Chen, Yu,Lai, Jinmu The Korean Institute of Power Electronics 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.2
This paper presents a novel integrated structure for a cascaded distribution static compensator (D-STATCOM) and distribution transformer for medium-voltage reactive power compensation. The cascaded multilevel converter is connected to a system via a group of special designed taps on the primary windings of the Dyn11 connection distribution transformer. The three-phase winding taps are symmetrically arranged and the connection point voltage can be decreased to half of the line-to-line voltage at most. Thus, the voltage stress for the D-STATCOM is reduced and a compromise between the voltage rating and the current rating can be achieved. The spare capacity of the distribution transformer can also be fully used. The working mechanism is explained in detail and a modified control strategy is proposed for reactive power compensation. Finally, both simulation and scaled-down prototype experimental results are provided to verify the feasibility and effectiveness of the proposed connection structure and control strategy.
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Disturbance Observer based Internal Model Control for Three Phase LCL-type Inverter
Jinmu Lai,Xianggen Yin,Zhen Wang,Langzi Li,Zhenyu Qi,Xin Yin 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper proposes a disturbance observerbased internal model control for the three-phase LCL-type grid-connected inverter. The proposed control scheme is designed in dq-frame, and the compound controller includes an internal model control (IMC) feedback part and a feedforward compensation part for the disturbances by using a disturbance observer (DO). The attractive advantages of this structure are that the lumped disturbances including the strong coupling effects of LCL filter, model mismatched and external disturbances can be suppressed effectively, and the parameters of the two controllers can be designed separately with easy implementation. The simulation and experimental results demonstrate that the proposed method has a better lumped disturbance rejection property than that of PI method in controlling three-phase LCL-type inverter.
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Yongxin Chen,Xianggen Yin,Xingzhu Wang,Xiangyuan Yin,Wenbin Cao,Yuanlin Pan 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper proposes a hybrid UHVDC system dedicated for long-distance power transmission and back-toback interconnection of the receiving region power grids. The receiving terminal of the UHVDC system is formed by the LCC and MMC in cascaded connection. The system combines the merits of hierarchical connection and asynchronous interconnection, which optimizes the network structure of the receiving system and makes the power distribution of the receiving region grids more flexible. The topology of the system is introduced in detail. The control strategy and the DC fault clearing strategy are proposed. Finally, the UHVDC system is built in PSCAD / EMTDC. The simulation verifies the effectiveness of the control strategy, the DC fault clearing strategy and the re-starting strategy. The results indicate that this kind of UHVDC system has a good application prospect in large-capacity long-distance power transmission to the asynchronous regional power grids.
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Ertao Lei,Xianggen Yin,Yu Chen,Jinmu Lai 전력전자학회 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.2
This paper presents a novel integrated structure for a cascaded distribution static compensator (D-STATCOM) and distribution transformer for medium-voltage reactive power compensation. The cascaded multilevel converter is connected to a system via a group of special designed taps on the primary windings of the Dyn11 connection distribution transformer. The three-phase winding taps are symmetrically arranged and the connection point voltage can be decreased to half of the line-to-line voltage at most. Thus, the voltage stress for the D-STATCOM is reduced and a compromise between the voltage rating and the current rating can be achieved. The spare capacity of the distribution transformer can also be fully used. The working mechanism is explained in detail and a modified control strategy is proposed for reactive power compensation. Finally, both simulation and scaled-down prototype experimental results are provided to verify the feasibility and effectiveness of the proposed connection structure and control strategy.
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