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1.新能源电力系统国家重点实验室(华北电力大学),河北省保定市 071003
2.现代电力系统仿真控制与绿色电能新技术教育部重点实验室(东北电力大学),吉林省吉林市 132012
Received:06 August 2021,
Revised:2022-01-08,
Published Online:05 May 2022,
Published:25 July 2022
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周一辰,孙佳辉,王书祥等.基于高维模型表达方法的新能源电力系统小干扰失稳风险评估[J].电力系统自动化,2022,46(14):73-82.
ZHOU Yichen,SUN Jiahui,WANG Shuxiang,et al.Risk Assessment of Small-signal Instability for Renewable Power System Based on High-dimensional Model Representation Method[J].Automation of Electric Power Systems,2022,46(14):73-82.
周一辰,孙佳辉,王书祥等.基于高维模型表达方法的新能源电力系统小干扰失稳风险评估[J].电力系统自动化,2022,46(14):73-82. DOI: 10.7500/AEPS20210806006.
ZHOU Yichen,SUN Jiahui,WANG Shuxiang,et al.Risk Assessment of Small-signal Instability for Renewable Power System Based on High-dimensional Model Representation Method[J].Automation of Electric Power Systems,2022,46(14):73-82. DOI: 10.7500/AEPS20210806006.
受新能源电力系统中随机变量多和概率分布复杂等特点影响,小干扰失稳风险评估面临高效性和准确性两方面挑战。因此,提出基于高维模型表达方法的新能源电力系统小干扰失稳风险评估方法。首先,使用核密度估计法构建单变量概率分布模型,使用Pair-Copula函数模型构建高维相关变量联合分布模型,刻画变量复杂概率分布特征。然后,提出基于移动最小二乘法和高维模型表达方法的小干扰失稳风险评估方法,通过对非线性耦合相关性变量的稀疏逼近,提高建模求解效率。并针对风-光-负荷实际概率分布特征,提出了与概率结合的采样法以提高计算准确性。最后,以新能源接入的2区域4机系统和新英格兰-纽约16机系统为例进行分析,验证了所提方法的准确性和高效性。
Affected by the large number and complex probability distribution of random variables in the power system with renewable energy
the risk assessment of small-signal instability faces challenges in terms of efficiency and accuracy. Therefore
this paper proposes a risk assessment approach of small-signal instability for power systems with renewable energy based on the high-dimensional model representation method. First
the kernel density estimation method is used to construct the probability distribution model for single variable
and the Pair-Copula function model is used to construct the joint distribution model of high-dimensional correlation variables
which characterizes complex probability distribution of variables. Then
a risk assessment method of small-signal instability based on moving least squares method and high-dimensional model representation method is proposed
and the modeling efficiency is improved through sparse approximation to the nonlinear coupled correlation variables. According to the characteristic of the actual probability distribution of wind
irradiance and load
a sampling method combined with probability is proposed to improve the calculation accuracy. Finally
by using the 2-area 4-machine system and the New England-New York 16-machine system with access of renewable energy as examples for analysis
the accuracy and the efficiency of the proposed method are verified.
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