Implementation of transmission loading relief (TLR) to alleviate overloading in transmission system / Mohd Shahril Mokai @ Hashim

In an open access electricity markets, the amount of power transfer are estimated based on the off-line computation of available transfer capability (ATC). Inaccurate value of ATC may yield to security violations of transmission system and this requires the utility operators to invoke transmission loading relief (TLR) in order to maintain the reliability of transmission system. This thesis presents the relationship between TLR and ATC. The TLR is invoked by the power system operators in order to improve the utilization of the transmission system when there have overloaded lines. The ATC is determined by using the DC power flow and power transfer distribution factor (PTDF). The power transfer is obtained by injected the power at generator bus and the same amount of power extracted at load bus. The value of MW power transfer is varied randomly until there is no overloaded line occurred and this action is called as the TLR. The overloaded line is represented based on a negative value of ATC and this requires the implementation of TLR. A case study of the 6 bus IEEE RTS is used to verify the effectiveness of TLR to alleviate the overloaded transmission lines during power transfer.