中频电缆压降影响因素分析与优化方法研究

Analysis of factors influencing voltage drop of medium frequency cable and optimization method

长供电距离及高供电频率下电缆线路压降增加,导致系统供电容量及设计成本提高。为优化中频电缆线路压降,建立中频电缆简化数学模型,采用解析及有限元数值分析法研究了50~800 Hz工作频率下中频电缆交流电阻及导体电抗特性,分析了影响中频电缆压降的主要因素。在电缆结构设计方面,提出采用紧密型品字排布及减小电缆外径的方法,以降低中频电缆线路压降。额定电压12 kV/20 kV,截面积300 mm^(2)中频电缆Ansys仿真计算结果以及所搭建电缆压降平台测试结果,验证了所提优化方法的有效性。试验结果表明,采用紧密品字形排布方式且电缆外径减薄3 mm时,电缆压降可降低约10%。

The voltage drop of cable lines increases due to the long power supply distance and high frequency, resulting in increased system power supply capacity and design costs.In order to optimize high line voltage drop of the medium frequency cable, it establishes a simplified circuit model of the cable. Moreover, the analytical and finite element numerical analysis methods were used to analyze the AC resistance and conductor reactance characteristics in the range of 50 Hz to 800 Hz. Additionally, the factors affecting the voltage drop were also analyzed. To reduce the voltage drop of the cable, it proposes a method of adopting a compact type layout and reducing the diameter of the cable in terms of the structure design. Simulations calculated by the software Ansys and experimental results of the cable with a rated voltage of 12 kV/20 kV and a cross-sectional area of 300 mm^(2) verify the effectiveness of the proposed optimization method. It is found that the cable voltage drop is reduced by about 10% as the diameter of the cable is reduced by 3 mm.