| The transmission service of power system is advanced higher demand during the course of power industry tending towards market. How to fast and exactly estimate the transfer capability between areas in order to meet the requirement of electricity load under the security and reliability of power system is the urgent research subject. First, Available transfer capability and the relevant element are introduced, and then the methods based on deterministic method are dwelled on and their advantage also defect is summarized. The linear distribution factor method computation speed is fast, but the nonlinear relation between variables isn't considered, the result isn't accurate; The optimal power flow (OPF) methods, considering all constraints, are precise, but it is time-consumed, and the results are too ideal to realize. The problem of power flow equation divergence can be overcomed by continuation power flow method. Based on the above method, the ATC computation of continuation power flow using P-Q decomposition is proposed. This method considers bus voltages, line thermal limits and output limits of generation. It starts with base case, taking the course of predictor-corrector repeatedly until all specified constraints are met. As a result, the load parameter corresponding to the final solution is the required ATC. By comparison with other methods, the method proposed in this paper has the advantage of fast computation speed and good precise. Several systems, including IEEE14-bus system, are simulated by the proposed method. Simulation results show that the proposed method is feasible.
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