An adjacent table-based simplified model of distribution networks containing medium voltage buses of a substation is established. Identification of bus outage and the condition to start fast restoration procedure are discussed. A complex load shading parameter is set up to describe various load shading schemes. The imaginary part of the load shading parameter describes the states of switches of load shading schemes while the real part is the corresponding amount of shaded load. A new concept of independent tripping operation is also put forward. The procedure to search the operation with the least amount of shaded load for a feeder and a connected domain are detailed. The procedure for fast restoration of a large area breakdown of the whole distribution network under emergency states is dealt with using a typical grid distribution network as an example. Results of analysis show that the direct load shading scheme under the most balanced topology is not always the optimal scheme. The proposed method can obtain the optimal operating mode with the least amount of shaded load thus showing its feasibility.
To restore the distribution systems in emergency states with the minimum load shedding, a novel Tabu search approach is put forward. The set of tripped switches is used as candidate solution. Some virtual tripped nodes are defined at the ends of the terminal nodes and by the source nodes. The neighborhood searching is committed by moving a tripped switch to the adjacent node of its upper stream and down stream, respectively. A Tabu list is formed for the tripped switches. The index is to energize as much as possible loads with as less as possible operated times. The electrical limitations and the voltage criterions are used as constrictions. The global aspiration criterion is adopted. An example is given, which shows that the proposed approach is feasible and can deal with complicated indexes
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