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《Automation of Electric Power Systems》 2003-17
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TRANSIENT STABILITY-CONSTRAINED POWER TRANSFER LIMIT OF A CRITICAL CUTSET AND GENERATION ECONOMIC DISPATCHING

Fan Jichao, Yu Yixin(Tianjin University, Tianjin 300072, China)  
The boundary of the practical dynamic security regions (PDSR) in injection space is the union of hyper-planes vertical to coordinates axes that represent upper and lower limits of the nodal injections, and one or a few hyper-planes which describe critical points of transient angle stability in injection space for a specific contingency. Every hyper-plane boundary of dynamic security regions (DSR) corresponds to only one the critical cutest of network. In determining the critical points of transient stability, a simulation method is used with detail generator and load models. An expression, based on PDSR, for the power transfer limit of a critical cutset (PTLCC) is deduced. Theoretical analyses and case studies indicate that the PTLCC is not unique and varies in some range. Considering the generation dispatching, a mathematical model for determining the maximal PTLCC and a mathematics model of transient stability-constrained generation economic dispatch are recommended, which are linear programming problems such that they are very easy to solve. A simple and practical algorithm for solving the PTLCC maximization problem is also proposed which can be used in real-time. And the selected nodal order can provide very useful information to the system operators that the change of active power at nodes in the front of the order has less effect to cause system instability. A real bulk power system has been used to test the proposed methods.
【Fund】: 国家重点基础研究专项经费资助项目 (G19980 2 0 30 7)
【CateGory Index】: TM711
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