| The breakdown of transient stability is one of the most serious accidents in power system. Lines and generators will trip, power supply in a large range area will stop, and even the system will collapse sometimes when this kind of accident happens. Therefore, it is significant and necessary to analyze the transient stability theory of power system and find out some effective methods to control or prevent accident from happening. But the traditional stability analyzing follows a pattern of contingencies plus exact operating status. In this pattern, we can't estimate the transient stability of system efficiently or in full-scale because of the infinity of operating status. Traditional optimal power flow (OPF) module can not integrate economy and security of system in a good manner, either.Through the combining of optimal power flow module and transient stability conditions, we set up a new multi-contingencies transient stability optimal power flow module (TSOPF).Based on the general OPF module and under multi-contingences conditions, all swing equations of generators will be converted into numericalequivalent algebraic equations set by using the implicit trapezoidal rule, and are involved in equality constrains set; all rotors' angles related to COI are used to be inequality constrains. After this new TSOPF module including of transient stability secure constrains constructed, the paper presents a new algorithm combined interior point algorithm for solving it. And then, the number of pre-contingences in contingences sets will be re-defined by using this algorithm in long time interval. Programming tests and experiments on Matlab6.5 software indicates that new algorithm has very good performance in convergence and calculation speed. The result is accurate, reliable and economic.
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