含电动汽车集群调频的信息能源系统谱特征和稳定性评估

Spectral Feature and Stability Assessment for Cyber-Energy System with Frequency Regulation of Electric Vehicle Cluster

文中研究电动汽车(EV)集群参与调频的信息能源系统稳定性,提出了一种含EV集群调频的信息能源系统谱特征和稳定性评估方法。首先,考虑电力系统(物理)和通信(信息)环节,建立包含EV集群参与调频的信息能源系统分析模型;其次,利用无穷小算子变换技术,将含物理-信息环节的调频系统谱转换成无穷小算子的谱,消除难以处理的超越项。基于用户需求,综合考虑准确度与速度指标,选择切比雪夫离散化方案对无穷小算子进行离散化,进而生成有限维近似矩阵,通过近似矩阵特征值的求解和牛顿迭代校正,得到调频系统临界特征值及其特征向量,用于评估分析系统特定状态下的稳定性。在此基础上,进一步构建含EV集群调频的信息能源系统稳定域,用于多方位评估时滞对系统稳定性的影响。最后,通过实例验证了所述方法的有效性。

The stability of the cyber-energy system with electric vehicle(EV)cluster participating in frequency regulation is studied.A spectral feature and stability assessment method is proposed for cyber-energy systems with frequency regulation of EV cluster.Firstly,the analysis model of cyber-energy systems with EV clusters is developed considering the power system(physical)and communication(information).Secondly,an infinitesimal generator is used to transform the spectrum of the frequency regulation system with physical-information links into the spectrum of the infinitesimal operator,removing the exponential terms.Thirdly,based on the users’demands,simultaneously considering accuracy and speed,the Chebyshev discretization scheme is selected to discretize the infinitesimal operator,resulting in a finite-dimensional matrix approximant.By solution of the eigenvalues for the approximant matrix and Newton iterative correction,the critical eigenvalues and eigenvectors of the regulation system are obtained to evaluate and analyze the stability of the system in a specific state.Based on this,the stability region of the cyber-energy system with frequency regulation of the EV cluster is extracted,which is used to evaluate the effect of cyber delay on the system stability from multiple directions.Finally,the effectiveness of the proposed method is validated by case studies.