基于全寿命周期成本的电力变压器检修决策

Maintenance Decision for Power Transformer Based on Life Cycle Cost

电力变压器作为电网系统中的枢纽设备,其运行的可靠性和经济性与电网的安全运行有着必不可分的关系。为统筹兼顾变压器可靠性与经济性,确定最佳检修策略,从全寿命周期成本的角度出发,考虑了大修方式下动态的役龄回退因子以及小修对役龄回退和故障率的影响,建立了大修和小修同时影响下的动态的役龄回退模型,并据此建立以全寿命周期成本最小为目标的电力变压器全寿命周期成本模型;同时将搜索步长的自适应和参数Pa的自适应策略相结合对布谷鸟搜索算法进行改进,然后应用改进的布谷鸟搜索算法对变压器检修成本模型进行了优化,得到变压器最优的大修时间以及对应的全寿命周期成本;最后将3次大修、2次大修以及等时间间距大修情况进行了对比,结果表明,在保证可靠性的前提下,3次大修的方案具有最优的经济性。

As a crucial equipment in power grid system,the reliability and economic efficiency of a power transformer are inseparable from the safe operation of power grid.To determine the best maintenance strategy while taking into account the reliability and economic efficiency of power transformer,from the perspective of life cycle cost,the dynamic age reduction factor under overhauls and the impact of minor repairs on the age reduction and failure rate are considered,and a dynamic age reduction model under the influence of both overhauls and minor repairs is established.On this basis,a life cycle cost model for the power transformer with the goal of minimizing the life cycle cost is built.At the same time,the cuckoo search algorithm is improved by combining the self-adaptive strategies for search step and parameters Pa;afterwards,the improved cuckoo search algorithm is used to optimize the maintenance cost model of power transformer to obtain the optimal overhaul time and the corresponding life cycle cost.Finally,three overhauls,two overhauls,and equal time interval overhauls are compared.Results show that the scheme of three overhauls has the best economic efficiency under the premise of guaranteeing the reliability.