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Real Time Identification and Stability Assessment of Electric Power Systems By Synchronized Measurement

电力系统同步测量实时辨识与稳定性评估

基本信息

批准号：
12450107
负责人：
SAITOH Hiroumi
金额：
$ 5.38万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

项目摘要

The participation of independent power producers into free markets of electricity will cause insecure operating conditions of a power system such as unforeseeable power flow profiles where the effects of a fault spread over the whole system. In our research project, in order to prevent such effects from spreading, real time assessment of power system stability based on synchronized measurement technology has been studied. The results obtained through the project are as follows.1. A novel method to estimate modal frequencies and damping factors of major power oscillations was developed which is based on identification of power system dynamics and eigenanalysis of the identified system. The synchronized measurements of rotor angles and speeds of all generators and load deviations are used for the system identification. The effectiveness of the developed method was evaluated through simulation studies of the power system model used by Tohoku Electric Power Company.2. A new method to select the generators suitable for the detection of weakly damped slow oscillations from the rotor angles and speeds was developed which is based on coherency of generators with respect to the slow oscillations.3. Through the investigation of the field data that were obtained by the GPS based synchronized measurement system deployed over the northeast power system in Japan, it was clarified that the stochastic properties of random load deviations can be estimated from power flow fluctuations.4. In order to identify power system dynamics in real time, a parallel computing system, which consists of fourteen PCs and LAN, was developed. By utilizing the computing system, application of mobile agent to power flow management in competitive electricity markets was clarified.5. As a new approach for DSM, Customer's Cooperation System was proposed in order to improve voltage profile of distribution networks including many dispersed generators.

独立电力生产商参与电力自由市场将导致电力系统的不安全运行条件，例如不可预见的潮流分布，其中故障的影响遍及整个系统。为了防止这种影响的蔓延，本课题对基于同步量测技术的电力系统稳定性真实的实时评估进行了研究。本项目取得的成果如下：1.提出了一种基于电力系统动力学辨识和被辨识系统特征分析的估计主要功率振荡模态频率和阻尼因子的新方法。同步测量所有发电机的转子角度和速度以及负载偏差用于系统辨识。通过对东北电力公司的电力系统模型进行仿真研究，评价了所开发方法的有效性.提出了一种基于发电机对慢振荡的相干性，从转子角度和转速选择适合弱阻尼慢振荡检测的发电机的新方法.通过对日本东北电力系统基于GPS的同步测量系统所获得的现场数据的调查，阐明了随机负荷偏差的随机特性可以从潮流波动中估计出来.为了实现电力系统动态特性的真实的实时辨识，开发了一个由14台PC机和局域网组成的并行计算系统。利用该计算系统，阐明了移动的Agent在竞争性电力市场潮流管理中的应用.为了改善分散发电机配电网的电压分布，提出了一种新的电力需求侧管理方法--用户协作系统。