Planning Method Of Soft Open Point For Supply Reliability And Economic In Active Distribution Networks

The rapid development of power electronics technology has spawned a series of novel power electronic devices,providing new solutions to the challenges brought by large-scale integration of renewables.Soft open point(SOP)refers to a novel power electronic device with the powerful capability of power flow control,which have positive contribution under normal operation and fault conditions of distribution network.The benefits both from the improvement of power supply reliability and operational economy should be considered at the planning stage.This thesis focuses on the soft open point planning method,the planning scenarios generation method is optimized,and the planning models of SOP and ESOP are established,which can effectively reduce the comprehensive cost of active distribution networks(ADNs)and maximize the benefits of soft open point investment.The main contributions of this thesis are summarized as follows:1)A typical scenario generation method is proposed.The clustering by fast search and find density peaks(CFSFDP)method is used to aggregate the annual load data,and the typical operation scenarios are generated to calculate operational cost under normal conditions.According to the analysis of the example,the typical operation scenario generation method based on the clustering by fast search and find density peaks method can optimize the selection of the initial number and centers of clusters to improve the efficiency and accuracy of scene reduction,and provide planning scenario for the soft open point planning method.2)To analysis the impact of the integration of SOP on the reliability of ADNs,a reliability analysis method based on SOP is proposed.The SOP based power supply recovery model is established,the states of load nodes are classified and analyzed.A reliability calculation method based on fault incidence matrix is used to calculate the node reliability index and the system reliability index respectively and the SOP based reliability analysis process of ADNs is given.Case studies on IEEE 33-node system analyze and verify the proposed method and the result shows that the integration of SOP can effectively improve the reliability of ADNs.3)Optimal siting and sizing methods of SOPs based on reliability and economy is proposed in this thesis,including optimal siting and sizing method of SOP based on reliability and optimal siting and sizing method of ESOP based on economy.The effectiveness of the proposed planning model is verified by the modified PG&E 69-node test system and IEEE 33-node system,the result shows that the proposed method can effectively reduce the comprehensive cost of distribution network,maximize the benefits of soft open point investment,and providing more realistic schemes for planners.