As the operating hours of urban rail transit continue to extend,the working hours of operational and maintenance personnel are progressively constrained.Conducting routine maintenance operations during non-peak hours of operation not only provides ample time for operational maintenance and upkeep but also enhances quality and efficiency of such activities.If a system under maintenance during non-peak operational hours encounters an N-2 operating condition,then prompt formulation of corresponding decision-making strategies and power restoration procedures are of necessity.In view of this,this paper delineates five scenarios wherein N-2 operating conditions arise,based on two maintenance modes for rectifier units in switching or mixing stations.A mathematical model for operational decision-making is proposed,encompassing removal of tertiary loads and reduction of departing train quantities.Taking an actual route within a decentralized power supply system as an illustrative case,simulations are carried out for all of the five scenarios,yielding power restoration approaches tailored to each case.Furthermore,in scenarios involving the maintenance of a rectifier unit and non-adjacent rectifier unit malfunctions,a solution is derived for achieving normal power supply system operation during non-peak operational hours,including the determination of optimal departure intervals.
urban railpower supply systemN-2 working conditionoperation,maintenance and repair strategydeparture interval
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