特高压和超高压交流输电系统运行损耗比较分析

输电系统运行损耗是影响整个输电系统经济性的重要因素。根据交流输电系统等值数学模型构建出满足同等输电能力的特高压和超高压交流输电方案，在此基础上计算出不同情景下各输电方案的损耗率大小，并分析了额定输送容量、输送距离和负载率变化对各输电方案损耗的影响。结果表明，特高压在各种情景下，均可以大幅降低运行损耗，特别是远距离、高负载率条件下，具有显著优势。相关结论可以为特高压和超高压交流输电的技术经济比选，特别是为合理确定各自适用的经济区间和具有优势的输电范围提供支持。

Comparative analysis of operation losses of UHV AC and EHV AC transmission systems

Transmission operating loss is an important factor affecting the economy of the whole transmission system. According to the equivalent mathematical model of AC transmission system, the UHV AC and EHV AC transmission schemes are constructed to meet the same transmission capacity, and the loss rate of each transmission scheme is calculated. It analyzes the influence of the change of the nominal transmission capacity, transmission distance and load rate on the loss rate of each transmission scheme. The results show that the characteristics of UHV in various situations can greatly reduce the operating loss, especially for long distance and high load rate. The conclusions can be used to the technical and economic comparison of UHV and EHV, especially for searching for the respective economic zone and the transmission range of advantages.