基于连续小波变换的电力系统动态稳定综合评估  

Comprehensive assessment of power system dynamic stability based on continuous wavelet transform

作　　者：刘春晓 姜涛[2] 李雪[2] 李鹏 张建新 李智勇 杨欢欢 LIU Chunxiao;JIANG Tao;LI Xue;LI Peng;ZHANG Jianxin;LI Zhiyong;YANG Huanhuan(Power Dispatching and Control Center,China Southern Power Grid Co.,Ltd.,Guangzhou 510623,China;School of Electrical Engineering,Northeast Electric Power University,Jilin 132012,China)

机构地区：[1]南方电网电力调度控制中心,广东广州510623 [2]东北电力大学电气工程学院,吉林吉林132012

出　　处：《电力自动化设备》2021年第2期144-152,共9页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(51607034);南方电网有限责任公司科技项目(ZDKJXM20180151)。

摘　　要：提出一种基于连续小波变换的电力系统主导振荡模式、振荡模态、参与因子及同调机群的综合评估方法。首先,借助小波变换实现电力系统多通道广域量测信息的时频域分解,获取各量测通道对应的小波系数矩阵;针对各小波系数矩阵,通过小波功率谱甄别与系统主导振荡模式强相关的关键小波系数向量;然后,利用关键小波系数向量估计系统主导振荡模式的振荡频率和阻尼比;在此基础上,借助交叉小波变换,估计各主导振荡模式下系统的振荡模态;进一步地,根据估计得到的振荡模态,估计系统各量测通道的参与因子和同调机群构成,实现基于连续小波变换的电力系统动态稳定综合评估。利用所提方法对16机68节点测试系统的仿真数据和实际电网的广域实测数据进行分析,结果验证了所提方法的有效性和可行性。A comprehensive assessment method of dominant oscillation modes,oscillation mode shapes,participation factors and coherent generator groups for power system is proposed based on CWT(Continuous Wavelet Transform).Firstly,the time-frequency domain decomposition of multi-channel wide area measurement information in power system is realized by using wavelet transform,and the wavelet coefficient matrix corresponding to each measurement channel is obtained.For each wavelet coefficient matrix,the key wavelet coefficient vectors strongly related to the dominant oscillation modes of system are identified by wavelet power spectrum.Then,the oscillation frequency and damping ratio of dominant oscillation modes are assessed based on the key wavelet coefficient vectors.On this basis,the system’s oscillation mode under each dominant oscillation mode are assessed by means of the cross wavelet transform.Furthermore,according to the obtained oscillation modes,the participation factor and coherent generator group of each measurement channel are assessed,and then the comprehensive assessment of power system dynamic stability is realized based on CWT.The proposed method is used to analyze the simulation data of 16-machine 68-bus test system and the wide area measured data of an actual power grid,and the results verify the effectiveness and feasibility of the proposed method.

关 键 词：广域量测信息 连续小波变换 主导振荡模式 振荡模态 参与因子 同调机群 动态稳定 电力系统 

分 类 号：TM712[电气工程—电力系统及自动化]