海底电缆谐波频段电气参数计算

随着海上风电的大规模开发,由海上风电接入电网引起的谐波问题越来越突出,迫切需要进行建模和分析,而在谐波频段对海底电缆进行建模是其中的一项重要工作.研究了海底电缆谐波频段电气参数的计算方法,为海底电缆建模提供了依据.首先给出了电缆电气参数的定义,然后总结了海底电缆电气参数的计算流程和计算公式,并对计算公式的适用性进行了论证,最后对3种典型海底电缆的电气参数进行了计算.结果表明,无论是电缆的正序参数还是零序参数,都会随频率有较大幅度的变化,在进行谐波分析时必须考虑电缆电气参数随频率变化的特性.

Calculation of Electrical Parameters of Submarine Cable in Harmonic Frequency Range

With the large-scale development of offshore wind power, the harmonic problem caused by the integration of offshore wind power has become more and more prominent, so the modeling and analysis are urgently needed. The modeling of submarine cables in the harmonic frequency range is one of the important work to tackle this problem. The calculation method for electrical parameters of submarine cable in the harmonic frequency range is studied, which provides a basis for the modeling of the submarine cable. First, the definition of electrical parameters of the cable is given, and then the calculation process and formulae for the electrical parameters of the submarine cable are summarized. The applicability of the calculation formulae is also demonstrated. Finally, the electrical parameters of three types of typical submarine cables are calculated. Results show that both the positive sequence parameters and the zero sequence parameters of the cable will change greatly with the frequency, and the characteristics of the electrical parameters of the cable changing with frequency must be considered when performing harmonic analysis.