大型集中外送系统频率时空演变动态分析及其广域协调控制的基础研究

Wide-area frequency contains plentiful information. It is widely used and prospective in stability monitoring, emergency control, damping control and disturbance analysis in electric power systems. However, there lacks of in-depth research in frequency and its stability control. Especially, for the large-scale concentrated sending power system formed due to long-distance bulk power delivery, such as in China, the dynamic frequency behavior is quite different from that in traditional power grid. This project, based on previous research works, aims to make in-depth study on the modeling and analysis method for frequency dynamics in large-scale sending power system, and comprehensive coordinated control strategies. The project is initiated in an effort to have the disturbance in large-scale power network always under controlled condition, avoiding occurence of cascading failure. The project plans to: 1) establish the analysis model for time-space evolution of frequency, considering electical distance, non-uniform distribution of generators and loads; and further realize the quantitative evaluation of the frequency security and stability considering time-space distribution of frequency dynamics; 2) establish the approaches for analysis and evaluation of the coordination of various frequency control measures, realizing the optimized configuration of their parameters; and further establish a uniform model to implement the closed-loop adaptive coordinated control. The research result can not only be used in off-line decision-making, but also provides analysis and design tools for coordinated on-line wide-area control and protection, exploring novel approaches for self-healing control of large-scale power grid, hence is of important value both for theoretic development and applications.

广域频率蕴含着大量信息，在电力系统安全稳定监视、紧急控制、阻尼控制及扰动分析等领域有广阔的应用前景。但频率动态行为及其稳定控制方面的研究尚不够深入，尤其对于我国由于大容量远距离输电而形成的大型集中外送系统，其频率动态表现出诸多与传统电网不同的新特征。该课题在前期研究工作基础上，深入研究大型送端电网频率动态过程的建模和分析方法，以及综合协调控制对策，力求大电网运行过程中扰动处于受控条件下，防止其传播而导致连锁故障发生。课题拟建立考虑电气距离、机组和负荷在空间不均匀分布的频率时空演变过程分析模型，实现考虑时空动态分布的频率安全稳定量化评估；并建立分析和评估各种频率控制措施之间协调的方法，实现其参数的优化整定，进而建立统一模型来实现闭环自适应协调控制。研究成果不但为离线制定控制决策服务，也为协调在线广域控制和保护提供分析和设计工具，为大电网自愈控制探索新思路和方法，具有重要的理论意义和应用价值。

广域频率蕴含着大量信息，在电力系统安全稳定监视、紧急控制、阻尼控制及扰动分析等领域有广阔的应用前景。本课题通过揭示大型集中外送系统中大扰动条件下频率动态过程的机理和影响因素，建立了机电扰动下，大型电网中机电扰动在机组之间的传输速度模型，研究了动态频率稳定的量化评估指标体系和评估方法，从而建立了大型集中外送系统全局频率动态过程监测、分析和稳定性评估的分析方法体系。在此基础上，综合利用广域频率信息，探索多种频率控制措施的协调优化控制的方法和理论，建立了多时变时延的频率动态发展分析方法，研究了多种控制措施协调程度的方法。形成了大型集中外送系统频率时空动态分析相关方法与理论；设计研究了大型集中外送系统频率控制协调优化方法及其控制器设计方法；建立了大型电网频率时空演变显示平台；完成专著1部：Innovative Testing and measurement Solution in Smart Grid；发表高水平学术论文24篇、专利4项；培养博士生3名、硕士生4名。