Determination of Available Transfer Capability Incorporating Transmission Reliability Margin

Abstract

In a deregulated power system, determination of available transfer capability (ATC) should incorporate the amount of transmission reliability margin (TRM) so that the transmission network is secure under a reasonable range of uncertainty that occur during a power transfer. This paper presents a new approach to evaluate the TRM with an extensively large amount of uncertainty. The approach uses the standard uncertainty method which incorporates the parametric bootstrap technique and the normal probability density function. The uncertainty of system parameters that used in the TRM estimation is the uncertainty of transmission line impedances and forecasted peak load. ATC is then estimated by considering the outages of critical transmission line and critical generator unit and the TRM. A case study of IEEE 300 bus system is used to verify the robustness of the TRM method in estimating the ATC. Comparison in terms of accuracy in evaluating the TRM is made between the standard uncertainty and standard deviation of uncertainty techniques that used in the TRM methods.Index Terms-Available transfer capability, transmission reliability margin, parametric bootstrap technique, standard uncertainty method.

Load modeling using the Ornstein-Uhlenbeck process

“…Reasonably this meanreversion should be proportional to the size of the deviation from the mean. Putting all the assumptions together, the loads deviation from its mean function is modeled by a stochastic process solution to the following Stochastic Differential Equation (SDE) [5]:…”

Quantifying TRM by Modified DCQ Load Flow Method

“…The implication of considering ATC in TRM determination to ensure continuous power transfer during any kind of disruptions. Moreover, various techniques have been proposed for computation TRM and ATC [3][4][5][6][7][8][9][10][11][12][13][14][15]. DC power flow method considered for active power flow rather than reactive power but in a transmission network voltage level needs to keep stable otherwise over-voltage or voltage collapse will happen easily; for this reason, VAR is essential to control the system in a tolerable margin of security and authenticity.…”