Available Transfer Capacity (ATC) Calculation of a Power Network with Renewable

Abstract

Electric utility around the world is undergoing restructuring, deregulation and privatization. Hence transmission network tend to be heavily loaded and transmission services become one of the most critical element. Power system transfer capability indicates how much inter area power transfers can be increased without compromising system security. For both planning and operation of the bulk power market, accurate identification of this capability is very important. Available Transfer Capacity (ATC) is the amount of transfer capacity that is available at a certain time in the electric power network under different system operating conditions. The computation of ATC is very important to keep reliability and security of power system. An accurate ATC computation is also very important for strengthening of the transmission system. If the computed ATC is less than the ATC of the system, the transmission of power will not be efficient and economic, if the computed ATC is more than the ATC of the system, the transmission line will be operating at dangerous state and any further power increase may result in collapse the whole system and the result of that is disastrous. The value of ATC for a transmission line will vary with many cases with the consideration of size of the system required to be evaluated, computation time frame, storage requirement etc. It is preferable to determine ATC using consideration of PTDF (power transfer distribution factor). For the purpose of determination of ATC of any typical power network, DCPTDF (DC Power Transfer Distribution Factors) method is considered as preferable. Hence, mathematical modeling of IEEE 6 bus and WSCC 9 bus system is carried out in MATLAB. The algorithm of DCPTDF calculations have been implemented for the said system using program in MATLAB. To validate the result using MATLAB, same system is developed in Powerworld Simulator education evalution 19 version and Powerworld Simulator 17 GSO education edition version and using the same approve DCPTDF have been analyzed and compared. This project also focuses on the variation of ATC value with varying renewable energy.