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Power System Analysis and Control
In recent years, power systems become larger and larger, and large scale blackout also occurs more frequently. The research on maintaining power system security and preventing cascading failures is becoming one of the hot topics in power system area, especially after the US-Canada blackout on Aug. 14, 2003. The major research in our group focuses on taking effective measures to prevent the propagation of system failures in a power system emergency.
System splitting is an important measure in power system emergency control, and is called the ‘last line of defense’ for maintaining power system security. Our overall framework of solving the system splitting problem is: first select the strategies satisfying syncronization and power balance constraints from all possible strategies, then further select the strategies satisfying transmission line capacity constraints as the feasible splitting strategies.
Take the IEEE 30 bus case as an example, suppose after system failures the generators are no longer synchronized, and there are three asynchonized generator groups:
Then one of the splitting strategies is to cut several transmission lines to separate the asynchronized generator groups, so that the original system becomes three separate systems operating independently:
If the transient process before and after the splitting satisfies system security requirements, the three separate systems will be able to reach their static states, thus avoiding the crash of the entire network.
- Prof. Qianchuan Zhao
- Prof. Dazhong Zheng
- Prof. Qiang Lu
- Prof. Peter B. Luh
- Prof. Xiaohong Guan
- Dr. Qingshan Jia
Ph. D Students:
- Kai Sun (graduated)
- Mingyang Li
- Xiao Li
- IEEE Fellow M. Adibi and IEEE Fellow R. J. Kafka mentioned the “system splitting strategies based on OBDDs” put forward by Prof. Qianchuan Zhao and Dr. Kai Sun as one of the representing methods in system splitting among the papers in IEEE Transactions on Power Systems, the most important journal in power system area, in the year of 2006.
- ‘An efficient and effective method to search for system splitting strategies for large sclae power systems based on OBDDs’ is recommended as one of the outstanding results of the 973 project, and is evaluated as a breakthrough development by domestic experts including academicians Guoguang Gu, Luguang Yan and Jianchao Zhen.
- “A splitting strategy against power system collapse caused by blackouts” is granted Chinese patent of invention in 2007.
- The Ph. D thesis of Dr. Kai Sun, “An OBDD-based Three-phase Method for Searching for Splitting Strategies of Large-scale Power Networks against Blackouts,” is evaluated as the top-ranked Ph.D thesis in China in 2006.
- Sub-project of China 973 project “Study on splitting strategies for power systems”
- China NSF key project “Dynamic optimization and scheduling of networked water resource and thermal-hydro power systems”
Part of the numerical testing data and results in the papers published by our group:
Custom verification of the parallel implementation of power system splitting strategy:
http://obdd.cfins.au.tsinghua.edu.cn/ (Login username: mag, password: 199707)