Calculation Of Available Transfer Capability With Transient Stability Constrains

In the marketable management of electric power industry, many new problems are put forward, and one among them is the calculation and application of Available Transfer Capability (ATC). ATC is defined as the measure of the remaining transfer capability in the physical transmission network for power markets. It is an importance grantee for the security and stability of electric power system and electric power market.This paper researches the ATC in electric power market and the transient stability of electric power system, and proposes the ATC problem with the transient stability. The maximal electric power load of the accepting region is chosen as the objective function, and difference equations of the rotors movement are introduced as equality constrains, and inequality constrains include node voltages, the offsets of the rotor angles with relative to the inertia centre angle of the whole system, the line active powers and generator active powers of feeding region. Under various faults, the transfer power between the feeding region and the accepting region is increased continually, until the limitation of some device or system is reached. The paper uses primal-dual interior point method to acquire the optimal solution.The numerical simulations on test systems of 22-buse 39-buse and IEEE show that, when the economy, security and stability of the system are satisfied, the ATC with the transient stability can find a rational optimal solution.