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Power Supply Restoration For Active Distribution System Based On The Support Of Distributed Generation

Posted on:2019-03-30Degree:MasterType:Thesis
Country:ChinaCandidate:L JiangFull Text:PDF
GTID:2322330542993504Subject:Electrical engineering
Abstract/Summary:PDF Full Text Request
With the improvement of DG penetration and its control technology,the traditional distribution system has been transformed into a complex active system gradually.DGs can not only be used for power supplying during normal operation but also be used to resupply power to de-energized load in fault cases,including partial and all-black faults.However,the complexity of distribution network and randomness and uncertainty of DGs,may bring challenges on restoration and control technology.With the fully consideration of DG uncertainties,this paper presents a joint power supply restoration through combining the DG local restoration and switcher operation based restoration to enhance the self-healing capability in active distribution networks.The restoration algorithmic solution is designed to be able to carry out power restoration in parallel upon multiple simultaneous faults to maximize the load restoration as well as whilst minimizing power loss,topology variation and power flow changes.Compared with existing methods,the optimal restoration paths are obtained by successive optimization,where loads are resupplied by either DG based restoration or switcher operation based restoration in parallel style;the proposed restorative model take the adverse impacts on failure-free sections into consideration;the uncertainties of DGs are fully considered in the restorative model,and the effectiveness and robustness of the proposed method are validated through simulation experiments.The effectiveness and robustness of proposed restoration model is firstly validated in practical distribution system with the condition of single and multiple partial fault cases.Then,based on the DG-start strategy,the restorative model is applied to large scale fault cases to assess its effectiveness through three sets of contrast experiments.
Keywords/Search Tags:Index Terms, Distributed generation(DG), Active distribution network, Power restoration, All-black fault, Black-start
PDF Full Text Request
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