典型交流高压海缆工程载流量瓶颈分析与仿真研究

Analysis and Simulation Research on Current Carrying Capacity Bottleneck of Typical AC High-voltage Submarine Cable Project

海底电缆线路的负载能力由其瓶颈段决定,一般认为登陆段是整条线路载流能力的瓶颈,但海缆登陆段不同区域不同敷设条件下载流量存在明显差异,需要进一步确定海缆线路载流量瓶颈。对于登陆段多处区域受到阳光照射,建立了考虑太阳辐射的载流量有限元模型,并利用500 kV交流海底电缆预鉴定试验回路阳光直射区的负荷循环试验数据进行比对,验证模型的正确性和一致性。提出了系统、合理的载流量瓶颈段评估方法,并以舟山220 kV典型海缆工程为实例,应用Comsol软件对潜在瓶颈段载流量进行仿真计算和比较,确定了海缆线路真正的瓶颈区段载流量及短时过负荷能力,对海缆的安全运行具有指导意义。

The load capacity of the submarine cable line is determined by its bottleneck segment.It is generally believed that the landing section is the current carrying capacity bottleneck of the whole line.However,there are obvious differences in laying conditions in different areas of the cable landing section,so further identification of current carrying capacity bottleneck of the cable line is required.For many areas of the landing area exposed to sunlight,a finite-effect model of the consideration of solar radiation is established.In order to verify the correctness and consistency of the model,the load cycle test data of the direct sunlight zone of the 500 kV AC submarine cable in pre-identification test circuit are compared.A systematic and reasonable method for evaluating current carrying capacity bottleneck segment is proposed,take Zhoushan typical 220 kV submarine cable project as an example,and the finite element analysis software Comsol is used to simulate and compare potential bottleneck segment current carrying capacity,the real bottleneck segment current carrying capacity and short-term overload time of the cable line are determined.It is of guiding significance to the safe operation of sea cable.