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RISS 인기검색어
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- 저자 : Jinmu Lai (검색결과 4 건)
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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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Extendable space‑type switched‑capacitor multilevel inverter with fault‑tolerant capability
Yaoqiang Wang,Hengtai Zhang,Jinmu Lai,Kewen Wang,Jun Liang 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.6
Low reliability is one of the main concerns in terms of multilevel inverters (MLI) due to the presence of a large number of switches and capacitors. Therefore, the fault-tolerant operation of MLIs has recently gained a great deal of attention. An extendable space-type switched-capacitor MLI topology with fault-tolerant characteristics is proposed in this paper. The proposed inverter employs a single direct-current voltage source and three capacitors to output staircase voltage levels with low distortion. The proposed topology is capable of tolerating open-circuit faults due to the separated charging paths of the inverter. Under pre-fault and post-fault operations, it preserves capacitor voltage balancing, voltage boost capability, as well as the ability to supply inductive loads. Furthermore, the voltage stresses of the switches and the voltage ripples of the capacitors are decreased or remain under post-fault operations. The proposed topology has been validated with a laboratory prototype in both dynamic and steady-state operations.
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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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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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