Journal of South China University of Technology (Natural Science Edition) ›› 2008, Vol. 36 ›› Issue (2): 139-146.

• Power & Electrical Engineering • Previous Articles    

Simulation Analysis of Slow-Frequency Dynamics for Interconnected Power Systems with Preserved Network Structure

Liu Lei1  Du Zhao-bin2  Guan Xiao-hong1  Zhang Yao3  Ni Yi-xin2 Shi Li-bao4   

  1. 1. State Key Laboratory for Manufacturing Systems Engineering, Systems Engineering Institute, Xi＇an Jiaotong University, Xi＇an 710049, Shanxi, China; 2. Department of Electrical and Electronic Engineering, University of Hong Kong, Hong Kong, China; 3. School of Electric Power, South China University of Technology, Guangzhou 510640, Guangdong, China; 4. National Key Laboratory of Power Systems in Shenzhen, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, Guangdong, China
  • Received:2006-12-15 Online:2008-02-25 Published:2008-02-25
  • Contact: 刘磊（1976-），男，博士生，主要从事复杂系统建模与仿真、大型电力系统动态安全性研究. E-mail:lliu@sei．xjtu.edu.cn
  • About author:刘磊（1976-），男，博士生，主要从事复杂系统建模与仿真、大型电力系统动态安全性研究.
  • Supported by:

    国家重点基础研究发展计划资助项目（2004CB217900）;国家杰出青年基金资助项目（6970025）;国家自然科学基金资助项目（50337010;60574087）;国家“863”计划项目（2004AA412050）

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Abstract:

In the long-term dynamics of large-scale interconnected power system （LIPS）, some crises may occur due to the slow-frequency dynamics and the slow-voltage dynamics. As a result, large blackouts take place. In order to solve this problem, the slow-frequency dynamics for LIPS with preserved network structure is modeled and simulated, which is the first step in the controllor design for slow-frequency dynamics. By taking the frequency of COI （Center of Inertia） in an area as the uniform frequency of the area, the corresponding model describing the slow-frequency dynamics is proposed, and an algorithm for time-domain simulation is presented. The proposed method is finally applied to a 2-area 4-machine system and a 3-area 30-bus IEEE system. The results show that, as compared with the conventional transient stability program in the 4-machine system, the proposed model and method are both more feasible and effective.

Key words: interconnected power system, slow-frequency dynamics, time-domain simulation, dynamic load flow, center of inertia