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RISS 인기검색어
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- 저자 : Peiyi Gao (검색결과 3 건)
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Design of Direct-Current Fuzzy Controller for Mitigating Commutation Failure in HVDC System
Gao, Benfeng,Yuan, Kewei,Dong, Peiyi,Luo, Chao,Zhao, Shuqiang The Korean Institute of Electrical Engineers 2018 Journal of Electrical Engineering & Technology Vol.13 No.4
Commutation failures can deteriorate the availability of high-voltage direct current (HVDC) links and may lead to outage of the HVDC system. Most commutation failures are caused by voltage reduction due to ac system faults on inverter side. The commutation failure process can be divided into two stages. The first stage, from the occurrence to the clearing of faults, is called 'Deterioration Stage'. The second stage, from the faults clearing to restoring the power system stability, is called 'Recovery Stage'. Based on the analysis of the commutation failure process, this paper proposes a direct-current fuzzy controller including prevention and recovery controller. The prevention controller reduces the direct current to prevent Commutation failures in the 'Deterioration Stage' according to the variation of ac voltage. The recovery controller magnifies the direct current to speed up the recovery of power system in the 'Recovery Stage', based on the recovery of direct voltage. The validity of this proposed fuzzy controller is further proved by simulation with CIGRE HVDC benchmark model in PSCAD/EMTDC. The results show the commutation failures can be mitigated by the proposed direct-current fuzzy controller.
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Design of Direct-Current Fuzzy Controller for Mitigating Commutation Failure in HVDC System
Benfeng Gao,Kewei Yuan,Peiyi Dong,Chao Luo,Shuqiang Zhao 대한전기학회 2018 Journal of Electrical Engineering & Technology Vol.13 No.4
Commutation failures can deteriorate the availability of high-voltage direct current (HVDC) links and may lead to outage of the HVDC system. Most commutation failures are caused by voltage reduction due to ac system faults on inverter side. The commutation failure process can be divided into two stages. The first stage, from the occurrence to the clearing of faults, is called ‘Deterioration Stage’. The second stage, from the faults clearing to restoring the power system stability, is called ‘Recovery Stage’. Based on the analysis of the commutation failure process, this paper proposes a direct-current fuzzy controller including prevention and recovery controller. The prevention controller reduces the direct current to prevent Commutation failures in the ‘Deterioration Stage’ according to the variation of ac voltage. The recovery controller magnifies the direct current to speed up the recovery of power system in the ‘Recovery Stage’, based on the recovery of direct voltage. The validity of this proposed fuzzy controller is further proved by simulation with CIGRE HVDC benchmark model in PSCAD/EMTDC. The results show the commutation failures can be mitigated by the proposed direct-current fuzzy controller.
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Fan Feng,Xin Zhang,Peiyi Gao,Fanfan Lin,Bohui Zhao,Hoay Beng Gooi 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
The emerging triple-phase-shift (TPS) modulation method has been successfully applied to the dual active bridge (DAB) converters, eliminating the circulating current and thus improving the efficiency. Hence the TPS-based DAB converter has been receiving greater attention in recent years. However, the interaction between the TPS-DAB converter and its LC filter may cause instable problems. This paper develops the impedance model of the TPS-DAB converter. With the developed input impedance model, the stability of the TPS-DAB converter and its LC filter is analyzed. The effects of the LC filter parameters on the stability of the TPS-DAB converter and the LC filter are clarified. Finally, the experimental results are provided for validating the impedance model and stability analysis.
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