桥吊接入状态对港区配电网首端节点谐波畸变率的影响分析OA

With the deepening implementation of the green and low-carbon development strategy,electrification transformation has been widely promoted in major ports across China.However,after that large-scale logistics handling equipment,such as quay cranes and yard cranes,are connected to the port distribution network,their short-term high-power characteristics can cause severe fluctuations in load power,and then significantly increases the current total harmonic distortion at the primary node of the distribution network.With the rise in total harmonic distortion,transformers will endure greater harmonic-induced additional losses,which,under long-term operation,accelerate aging and ultimately shorten their service lifespan.Based on the mapping relationship between harmonic distortion rate and transformer lifespan,this paper proposes a multioperating-condition-coupled dynamic evaluation model for the harmonic impact of quay cranes,quantifying the contribution of access location,equipment quantity,and operating state to the harmonic distortion rate at the primary node of the distribution network.First,based on the actual operating motion patterns of quay crane devices,a simulation model of quay cranes and yard cranes is constructed in Simulink using the asynchronous motor module to analyze the harmonic characteristics of port logistics handling equipment in practical engineering.Second,the impact of different operating conditions of the quay cranes on the harmonic current distortion rate at the primary common node of the distribution network and the lifespan of port transformers is quantified.Finally,simulation results based on the IEEE-14 bus distribution network system demonstrate that the proposed method accurately quantifies harmonic distortion rate under various operating conditions,providing theoretical support for maintenance personnel in formulating transformer harmonic suppression strategies and extending equipment lifespan.