Probabilistic assessment of interconnection assistance between power systems

The interconnection assistance (IA) between power systems is a function of many variables such as the system installed capacity, generation dispatch, forced and scheduled outages of generating units, load duration characteristics, accuracy of load forecast, load diversity, capability of the interconnections and the operating limits imposed on the transmission network due to thermal, voltage and stability considerations. This paper describes a probabilistic approach for evaluating the IA that a system can provide at any selected location without affecting its level of reliability. The method considers most of the key factors affecting the level of power transfer and differentiates between two types of transfer, namely the economy transfer and the emergency transfer. The method calculates the expected value and the probability distribution of IA of each type. The proposed method is illustrated using the IEEE Reliability Test System.