Control Strategies of Full-Voltage to Half-Voltage Operation for LCC and Hybrid LCC/MMC based UHVDC Systems
With the increasing demand of transmitting bulk-power over long-distance, the ultra high-voltage direct-current (UHVDC) transmission systems become an attractive option. Nowadays, not only the line commutated converter (LCC) based systems, but also the modular multilevel converter (MMC) based system...
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| Format: | Article |
| Language: | English |
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MDPI AG
2019-02-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/12/4/742 |
| _version_ | 1798042210806005760 |
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| author | Gen Li Wei Liu Tibin Joseph Jun Liang Ting An Jingjing Lu Marcio Szechtman Bjarne Andersen Qikai Zhuang |
| author_facet | Gen Li Wei Liu Tibin Joseph Jun Liang Ting An Jingjing Lu Marcio Szechtman Bjarne Andersen Qikai Zhuang |
| author_sort | Gen Li |
| collection | DOAJ |
| description | With the increasing demand of transmitting bulk-power over long-distance, the ultra high-voltage direct-current (UHVDC) transmission systems become an attractive option. Nowadays, not only the line commutated converter (LCC) based systems, but also the modular multilevel converter (MMC) based systems have reached UHVDC levels. The converter stations of UHVDC systems normally utilize two series-connected valve-groups to reduce the difficulties of device manufacturing and transportation. This high-voltage and low-voltage valve-group configuration allows the UHVDC systems to achieve a full-voltage to half-voltage operation which increases the flexibility of the systems. However, the existing research only focuses on the full-voltage to half-voltage control of LCC-UHVDC systems. The control strategies for hybrid LCC/MMC UHVDC systems are underresearched. Moreover, the approaches to reduce the load-shedding caused by the full-voltage to half-voltage control for both LCC and hybrid LCC/MMC based UHVDC systems have not been investigated. In this paper, full-voltage to half-voltage control strategies for both LCC and hybrid LCC/MMC based UHVDC systems have been proposed. Moreover, to avoid load-shedding caused by the half-voltage operation, a power rescheduling method that re-sets the power references of the half-voltage operating and full-voltage operating poles has been proposed. The proposed full-voltage to half-voltage control strategies and power rescheduling method can achieve a stable and fast control process with a minimum power loss. The proposed methods have been verified through the time-domain simulations conducted in PSCAD/EMTDC. |
| first_indexed | 2024-04-11T22:32:18Z |
| format | Article |
| id | doaj.art-a4c62de6a5614156bac4c647ecb60a35 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T22:32:18Z |
| publishDate | 2019-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-a4c62de6a5614156bac4c647ecb60a352022-12-22T03:59:22ZengMDPI AGEnergies1996-10732019-02-0112474210.3390/en12040742en12040742Control Strategies of Full-Voltage to Half-Voltage Operation for LCC and Hybrid LCC/MMC based UHVDC SystemsGen Li0Wei Liu1Tibin Joseph2Jun Liang3Ting An4Jingjing Lu5Marcio Szechtman6Bjarne Andersen7Qikai Zhuang8School of Engineering, Cardiff University, Cardiff CF24 3AA, UKSchool of Engineering, Cardiff University, Cardiff CF24 3AA, UKSchool of Engineering, Cardiff University, Cardiff CF24 3AA, UKSchool of Engineering, Cardiff University, Cardiff CF24 3AA, UKGlobal Energy Interconnection Research Institute, Beijing 102211, ChinaGlobal Energy Interconnection Research Institute, Beijing 102211, ChinaEletrobras Cepel, Rio de Janeiro 26053-121, BrazilAndersen Power Electronic Solutions, Bexhill-On-Sea TN39 4QL, UKGlobal Energy Interconnection Research Institute Europe GmbH, Kantstr, 162 Berlin, GermanyWith the increasing demand of transmitting bulk-power over long-distance, the ultra high-voltage direct-current (UHVDC) transmission systems become an attractive option. Nowadays, not only the line commutated converter (LCC) based systems, but also the modular multilevel converter (MMC) based systems have reached UHVDC levels. The converter stations of UHVDC systems normally utilize two series-connected valve-groups to reduce the difficulties of device manufacturing and transportation. This high-voltage and low-voltage valve-group configuration allows the UHVDC systems to achieve a full-voltage to half-voltage operation which increases the flexibility of the systems. However, the existing research only focuses on the full-voltage to half-voltage control of LCC-UHVDC systems. The control strategies for hybrid LCC/MMC UHVDC systems are underresearched. Moreover, the approaches to reduce the load-shedding caused by the full-voltage to half-voltage control for both LCC and hybrid LCC/MMC based UHVDC systems have not been investigated. In this paper, full-voltage to half-voltage control strategies for both LCC and hybrid LCC/MMC based UHVDC systems have been proposed. Moreover, to avoid load-shedding caused by the half-voltage operation, a power rescheduling method that re-sets the power references of the half-voltage operating and full-voltage operating poles has been proposed. The proposed full-voltage to half-voltage control strategies and power rescheduling method can achieve a stable and fast control process with a minimum power loss. The proposed methods have been verified through the time-domain simulations conducted in PSCAD/EMTDC.https://www.mdpi.com/1996-1073/12/4/742UHVDCline commutated convertermodular multilevel converterhybrid LCC/VSCpower reschedulinghalf-voltage operationvalve bypassing |
| spellingShingle | Gen Li Wei Liu Tibin Joseph Jun Liang Ting An Jingjing Lu Marcio Szechtman Bjarne Andersen Qikai Zhuang Control Strategies of Full-Voltage to Half-Voltage Operation for LCC and Hybrid LCC/MMC based UHVDC Systems Energies UHVDC line commutated converter modular multilevel converter hybrid LCC/VSC power rescheduling half-voltage operation valve bypassing |
| title | Control Strategies of Full-Voltage to Half-Voltage Operation for LCC and Hybrid LCC/MMC based UHVDC Systems |
| title_full | Control Strategies of Full-Voltage to Half-Voltage Operation for LCC and Hybrid LCC/MMC based UHVDC Systems |
| title_fullStr | Control Strategies of Full-Voltage to Half-Voltage Operation for LCC and Hybrid LCC/MMC based UHVDC Systems |
| title_full_unstemmed | Control Strategies of Full-Voltage to Half-Voltage Operation for LCC and Hybrid LCC/MMC based UHVDC Systems |
| title_short | Control Strategies of Full-Voltage to Half-Voltage Operation for LCC and Hybrid LCC/MMC based UHVDC Systems |
| title_sort | control strategies of full voltage to half voltage operation for lcc and hybrid lcc mmc based uhvdc systems |
| topic | UHVDC line commutated converter modular multilevel converter hybrid LCC/VSC power rescheduling half-voltage operation valve bypassing |
| url | https://www.mdpi.com/1996-1073/12/4/742 |
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