一种计及紧急功率支援的直流互联异步电网动态频率分析方法  

A Dynamic Frequency Analysis Method for HVDC-Interconnected Asynchronous Power Grid Considering Emergency Power Support

作　　者：胡益[1] 王晓茹[1] HU Yi;WANG Xiaoru(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 610031,Sichuan Province,China)

机构地区：[1]西南交通大学电气工程学院

出　　处：《电网技术》2018年第9期2859-2868,共10页Power System Technology

基　　金：中国博士后科学基金资助项目(2015M582543);四川省重点研发计划项目(2017GZ0054)~~

摘　　要：针对于直流互联异步电网,提出了一种可在计及直流紧急功率支援情况下,同时考虑直流两侧电网频率响应的扰动后动态频率分析方法。该方法对直流两侧电网的交流系统网络方程、综合负荷的静态模型、发电机原动机-调速器系统模型以及HVDC输电系统准稳态模型进行线性化处理,基于广域量测数据建立了直流互联异步电网扰动后的系统状态方程,可以同时求解出计及直流紧急功率支援的两侧电网频率动态响应。在此基础上利用二分法思想调整功率支援量,还可以获取某侧电网扰动后的频率极值或稳态值恢复到期望值所需的直流紧急功率支援量。对一个典型的两区域直流互联异步电网进行了仿真分析,验证了所提方法具有很高的精确性和适用性。Aiming at HVDC-interconnected asynchronous power grid, a dynamic frequency analysis method is proposed, to obtain post-disturbance frequency response of power grids on both sides of the HVDC system considering emergency DC power support. This method integrates AC system network equation, static load model, prime mover-governor system model and quasi-steady-state model of HVDC transmission system to establish state equation of the HVDC-interconnected asynchronous power grid based on data of wide area measurement system（WAMS）. By solving the state equation, the dynamic response curves of the power grids on both sides of the HVDC system are obtained. On the basis of the proposed method, the emergency DC power support amount can be obtained accurately using binary search, necessary to restore the limiting or steady-state frequency of one side power grid of HVDC system to the expected level. Simulation and analysis of a typical two-area HVDC-interconnected asynchronous power grid are carried out to verify accuracy and applicability of the proposed method.

关 键 词：直流互联异步电网 直流紧急功率支援 动态频率分析 广域量测技术 

分 类 号：TM721[电气工程—电力系统及自动化]