基于特高压交流半波长技术的立体电网构建研究

Study on Stereoscopic Power Grid Construction Based on UHV AC Half-Wave-Length Transmission Technology

半波长输电不仅可用于输电,还可用于组网,可以利用它电气阻抗近似为0的特性将受端电网不同落点之间的电气距离大大拉近。首先提出了基于半波长输电的"立体"电网构建理念;然后研究了点对网双(多)落点半波长输电对于受端同步电网结构形态的改变以及对稳定性的改善作用,进行了理论分析;并在2020年规划电网的基础上进行了仿真分析,初步验证了所提理念的可行性与有效性。研究结论认为基于半波长输电技术的"立体电网"构建可以极大地改变受端电网的形态,大大缩短了落点之间的电气距离,从而可以进一步提高同步电网的稳定性和直接同步功率支援效应。

Half wave-length AC transmission（HWACT） can be used not only in transmission, but also in power grid construction, utilizing nearly zero connecting impedance characteristics of HWACT line to shorten electric distance between different drop points in receiving gird. In this paper, firstly, the idea of building a stereoscopic power grid based on HWACT was proposed. Then its enhancing effects on changing grid structural form and improving stability of receiving-end synchronous power grid by using point-to-grid HWACT with double（multiple） drop points were studied and analyzed theoretically. Thirdly, simulations based on 2020 planning power grid were carried out to verify feasibility and effectiveness of the proposed idea. Finally, it was concluded that stereoscopic power grid based on HWACT can change form and structure of synchronous receiving grid in large extent, and enhance stability and synchronous power support of synchronous grid.