The Research On Available Transfer Capability Under The Condition Of Power Market Environment

Under the condition of power market environment, the reform in transmission area requires the right of a transmission provider to supply all the transmission customers equally, so as to take full advantages of transmission sources of power system. Thus, it is necessary to calculate ATC(Available Transfer Capability)fast and correctly. Firstly the full presentation of historic and recent research achievement of ATC is given, definition about calculation of ATC is introduced, including definition of Total Transfer Capability Transmission Reliability Margin Capacity Benefit Margin etc. Then, Several typical ATC calculating methods on the basis of determinable model are compared.Conventional security constrained optimal power flow methods maximize the transfer capability between two control areas assuming all OPFrOptimized parameters can be centrally dispatched, In the decentralized environment, usually this assumption cannot be satisfied, so they are not suitable for TTC(Total Transfer Capability) calculation. To overcome the deficiency of the conventional SCOPF, a transfer-based SCOPF model is presented in the paper, considering voltage limits thermal limits and stability limits. Sequential constrained variable metric programming is used in the optimal power flow (OPF) to calculate TTC. It assumes that only all OPF-optimized parameters involving the selected source and sink area can be dispatched, which can be satisfied in decentralized structure. It can also adjust the real power output at the source area, the real and active load at the sink area in any way, while RPF and CPF adjusts those in a fixed incremental step. TSCOPF is a good method to use in the future application.Lastly, A program for simulation and calculation is developed using toolbox of MATLAB and an example of calculation is given.