应用直流调制改善水电能源基地交流电网运行特性

发布时间：2018-03-24 22:27

本文选题：直流输电　切入点：附加频率控制器　出处：《电网技术》2017年12期

【摘要】：直流输电具有远距离、大容量、无稳定问题等特点,适用于大型能源基地电力集中开发和外送场景。随着我国能源基地的开发建设,直流工程数量以及送电规模不断提高,直流系统的调制功能对系统稳定运行的影响日益凸显。西南地区水电资源丰富,目前通过多回特高压直流工程送电至华东地区。水电基地电网独立运行时系统阻尼特性相对较差,故障时交流系统易发生超低频振荡现象。频率控制器是直流系统附加控制之一,能够根据交流系统频率变化快速调整直流输送功率,进而改善交流系统的频率特性和阻尼特性。西南电网仿真结果表明,利用直流频率控制器能够有效改善西南电网阻尼特性,提高系统频率稳定水平。
[Abstract]:HVDC transmission has the characteristics of long distance, large capacity, no stability and so on. It is suitable for centralized development and outgoing transmission of power in large energy base. With the development and construction of energy base in China, the number of DC projects and the scale of power transmission are increasing. The modulation function of DC system has an increasingly prominent impact on the stable operation of the system. The southwest region is rich in hydropower resources. At present, the system damping characteristics are relatively poor when the power grid of hydropower base is operated independently in East China through the multi-circuit UHV DC project. The frequency controller is one of the additional controls in the DC system, which can adjust the DC transmission power rapidly according to the frequency change of the AC system. The simulation results show that the DC frequency controller can effectively improve the damping characteristics and the frequency stability level of the system.
【作者单位】：国网北京经济技术研究院;国家电力调度控制中心;
【基金】：国家电网公司科技项目(5230HQ16000A)~~
【分类号】：TM732

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