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Research On Protection Scheme Of AC And DC Hybrid Distribution Network With Distribution Power Supply

Posted on:2019-04-14Degree:MasterType:Thesis
Country:ChinaCandidate:H SunFull Text:PDF
GTID:2392330578970538Subject:Power system and its automation
Abstract/Summary:PDF Full Text Request
With the development of social economy and the increasing demand for power supply,the AC power distribution network facing a series of problems,such as,insufficient power supply capacity,power quality cannot meet the requirements of power grid gradually and lacked of transmission corridors and so on.In the meantime,the rapid development of DC technology provides a new orientation for distribution system.Moreover,the wide application of HVDC transmission has provided some references for the development of DC distribution network.Therefore,DC distribution network has become a hot research topic both at home and abroad.However,the technology of DC power distribution network is not mature completely.The reliability of DC distribution network is still slightly insufficient than AC power distribution network due to the limitation of power electronic devices.Therefore,in this thesis,a protection scheme is established through the study of the fault characteristics of the DC distribution network and the characteristics of the distributed distribution network with distributed power supply based on AC/DC hybrid distribution framework.In the first,a simulation model of the DC distribution network is built on PSCAD according to the corresponding criteria and mathematical models.Then,on the basis of this,a simulation model of AC/DC hybrid distribution network with distributed power supply is built.Then,the fault characteristics of monopole grounding fault and interpole fault in DC distribution network are analyzed in this paper.A protection scheme on the basis of current differential is presented based on the characteristics of faults and the structure of DC distribution network.In addition,the influence of distributed generation on the protection coordination of AC distribution network is analyzed,and an anti-time overcurrent adaptive protection scheme is proposed.Finally,the simulation model and protection scheme are simulated and verified in PSCAD.The simulation results show that the proposed protection scheme is effective.
Keywords/Search Tags:AC/DC distribution network, fault analysis, current differential protection, adaptive protection, coordination protection
PDF Full Text Request
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