摘要
微电网在发生故障时系统等效阻抗值实时变化,影响自适应过电流保护整定值的计算,降低了保护的可靠性。为了实时计算出系统等效阻抗值,提出用鲁丁、奥社和法特米(rudinosherandfatemi,ROF)去噪模型优化戴维南等效阻抗值的方法。将计算戴维南等效阻抗最优值问题转化为优化去噪问题,采用ROF去噪模型优化戴维南等效阻抗值,用原-对偶混合梯度下降算法求解目标函数,并提出一整套自适应过电流保护方法。最后对微电网不同的运行模式、故障位置和故障类型等工况建立PSCAD/EMTDC仿真模型,使用Matlab软件对提取的信号进行分析,验证所提方法的有效性和优越性。
The real⁃time variation of equivalent impedance will,in case of fault of the microgrid,affect the calculation of the setting value of adaptive over⁃current protection and reduce the reliability of protection.For calculating the equivalent impedance of the system in real time,a denoising model of rudin osher and fatemi(ROF)is proposed to optimize the equivalent impedance of Devinan.The problem of calculating the optimal value of Thevenin’s equivalent impedance is transformed into an optimal denoising problem.The ROF denoising model is used to optimize the Thevenin’s equivalent impedance.The prime⁃dual hybrid gra⁃dient descent algorithm is used to solve the objective function,and a set of adaptive over⁃current protection methods are proposed.Finally,the PSCAD/EMTDC simulation model is set up such conditions as different operating modes,fault locations and fault types of the microgrid.Matlab software is used to analyze the ex⁃tracted signals so to verify the effectiveness and superiority of the proposed method.
作者
糟伟红
袁至
ZAO Weihong;YUAN Zhi(Engineering Research Center for Renewable Energy Power Generation and Grid Connection Control of Ministry of Education,xinjiang university,Urumqi 830047,China)
出处
《电力电容器与无功补偿》
2023年第3期126-133,共8页
Power Capacitor & Reactive Power Compensation
基金
国家自然科学基金项目(52067020)
新疆维吾尔自治区重点实验室开放课题(2018D04005)。
关键词
微电网
自适应过电流保护
ROF优化算法
等效阻抗值
microgrid
adaptive over⁃current protection
ROF optimization algorithm
equivalent impedance value
