风电经分频输电并网系统穿透能力计算方法研究

Ｒesearch on Calculation Method of Penetration Limit of Wind Power Integrated via Fractional Frequency Transmission System

摘要:

风电经分频输电并网是一种全新的风电并网方案。在对该系统结构及优点进行介绍的基础上，提出了一种 基于静态安全约束的穿越功率极限计算方法。该方法可以应用于常规风电并网系统以及风电经分频输电并网系统。 最后，在 ＲTS24 节点测试系统中对 3 种风电并网方案进行分析，对其风电穿透能力进行了对比。分析结果表明，与风 电就近并入电网边界相比，利用分频或者工频传输系统将风电传输至负荷中心可以数倍地提高风电的穿越功率极限 的结论。由此可见，分频输电系统为风电并网提供了一种全新的方案，具有经济与技术优势，在大型风电场中有着很 好的应用前景。

Abstract:

Fractional frequency transmission system ( FFTS) provides a new approach for integrating remote large － capacity wind power to grid． Firstly，the structure and advantages of this system are introduced． Then，an optimization method is proposed to determine the penetration limit of wind power by considering static security constraints． This method could be used for the system integrated wind system via FFTS and that via conventional transmission approach． Finally，three schemes are designed to integrate wind power to ＲTS － 24 testing system，and the the penetration limits of these schemes are compared． The results indicate that the penetration limits are increased obviously when the wind power is transmitted to load center instead of the border of the grid． Therefore，integrating wind farm to power grid via FFTS is a very promising approach to benefit wind power industry．