基于调制信号窗内模型的电力系统动态相量测量误差分析及方法研究

项目名称： 基于调制信号窗内模型的电力系统动态相量测量误差分析及方法研究

项目编号： No.51477173

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 电工技术

项目作者： 薛蕙

作者单位： 中国农业大学

项目金额： 80万元

中文摘要： 准确、快速的动态相量测量对于智能电网实施有效动态安全监控措施至关重要。本项目针对动态条件下电气信号幅值和频率时变的特点，以提高动态相量测量精度和速度为目标，把动态相量测量观测模型分为相量计算窗内模型和相量计算窗外模型，按照窗内外分别建模的原则，对各种动态条件都建立基于调制信号的窗内模型。根据三角函数变换和长时间信号傅立叶谱研究调制信号的时频对应关系,根据调制信号时频特点研究电气信号幅值和频率时变给动态相量测量带来的误差，在误差分析的基础上研究各种误差抑制方法，从测量精度和响应速度等方面研究和比较各种误差抑制方法的性能。研究各种波形畸变和动态干扰因素对误差抑制方法的影响。总结上述规律，研究和建立基于调制信号窗内模型的动态相量测量方法，并通过试验验证及理论分析的手段分析和评价所建立的方法。

中文关键词： 智能电网；信号处理；电磁测量；相量测量；调制信号

英文摘要： The accurate and fast measurements of dynamic phasor are important to the effective implementation of dynamic monitoring and controlling strategy of smart grid. In this project, fully considering the time varying characteristics of amplitude and frequency of electrical signal, aiming at improving dynamic phasor measurement precision and response time, the models of dynamic phasor measurements are divided into inner window model and outside window model. Based on the principle of establishing the inner window model and outside window model separately, the modulation signal model is built as the inner window model for all dynamic conditions. The time frequency characteristics of modulation signals are studied using the trigonometric function transform and long time signal spectrum, and the phasor measurement errors under varying amplitude and frequency of electrical signals are analyzed based on the time frequency characteristics of the modulation signals. Then error elimination methods are analyzed and compared based on measurement precision and response time. The impacts of waveform distortions and dynamic disturbances are studied. Summarizing all the above rules, the dynamic phasor measurement method based on modulation signal inner window model is established. Simulation/field experiments and theoretical analysis are developed to analyze and evaluate the proposed method.

英文关键词： smart grid;signal processing;electomagnetic measurement;phasor measurement;modulation signal