Determination and Analyses of Available Transfer Capability: Deregulated and Restructured Power Systems Perspective

摘要

In a deregulated environment, Available Transfer Capability (ATC) values accurately depict the transferable quantum of power over the transmission network with due consideration for limits violations. This paper applies repeated alternating current power flow (RACPF) approach for the calculation of ATC. In this work, RACPF based on Newton Raphson (NR) power flow equation was developed in a MATLAB software environment to obtain various values of ATC using IEEE 30 bus reliability system as a test case. ATC values for inter-area line outage and generator outage contingency conditions are obtained and analyzed. ATC for bilateral and multilateral transactions as well as outage of inter-area tie lines during these conditions are also presented. It is observed from the results that RACPF approach is more accurate when compared with the results obtained using ac power flow in previous work. Numerically to mention but few, 11.574 MW was obtained above the recorded ATC value for transmission line 1-2 while 29.014 MW values was obtained below the recorded value for line 6-8. It is also established from the results that ATC values present an understanding of transmission network conditions and limits needed for operational purposes especially in a deregulated power sector.