利用本地频率线性分量的电力系统功率缺额估计方法  

Power Deficit Estimation Method of Power System Based on the Linear Component of Local Frequency

作　　者：秦颖婕 李文博 伍双喜 李佳朋 谭嫣 李宇骏 QIN Yingjie;LI Wenbo;WU Shuangxi;LI Jiapeng;TAN Yan;LI Yujun(Power Dispatching and Control Center of Guangdong Power Grid Co.,Ltd.,Guangzhou 510060,China;Department of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]广东电网有限责任公司电力调度控制中心,广州510060 [2]西安交通大学电气工程学院,西安710049

出　　处：《南方电网技术》2023年第8期96-103,112,共9页Southern Power System Technology

基　　金：中国南方电网有限责任公司科技项目(036000KK52190024(GDKJXM20198256));国家自然科学基金面上项目(52277122)。

摘　　要：针对现有功率缺额估计方法可靠性低、耗时长等缺点,提出了一种基于本地频率信息的快速功率缺额估计方法。首先,通过求解常微分方程初值问题,证明了在系统受扰初期,本地频率变化量可以表示为一个线性分量与n-1个机电模式的线性组合,且本地频率的线性分量与系统惯量中心频率变化量相等。基于这一特性,提出了一种无需远程通信的系统功率缺额快速估算方法。该方法基于最小二乘拟合提取本地频率的线性分量来估计系统惯量中心频率,并结合惯量水平估算系统的功率缺额。最后,在PSCAD/EMTDC中搭建了新英格兰39节点系统,验证了所发现性质的正确性和所提功率缺额估计方法的有效性。Aiming at low reliability and long time-consuming of existing system power deficit estimation algorithms,a fast power deficit estimation algorithm based on local frequency information is proposed.Firstly,it is proved that local frequency deviation is composed of the linear component and n−1 electro-mechanical(EM)modes via solving the initial value problem of ordinary dif⁃ferential equations.Furthermore,the linear component of each local frequency deviation is identical to the center of inertia(COI)frequency deviation in the early stages of system disturbance.Based on this property,a remote-communication-independent system power deficit estimation method is proposed.In the proposed method,the center of inertia(COI)frequency can be estimated via extracting the linear component of local frequency based on least-squares fitting.Then,the system power deficit is estimated by combining system inertia level.Finally,New England 39-bus system is built in PSCAD/EMTDC to verify the correctness of the property and the effectiveness of the proposed power deficit estimation method.

关 键 词：功率缺额估计 本地频率 惯量中心 最小二乘拟合 

分 类 号：TM712[电气工程—电力系统及自动化]