Reliability equivalents in composite system reliability evaluation

The concept of utilising equivalents in the evaluation of large power systems, where sensitivity studies are to be done or the impact of a further interconnected system is to be examined, is a very powerful and useful tool. The paper illustrates a technique for developing reliability equivalent models for power systems or for parts of power systems. A second technique is presented, which shows how to include these equivalents in further composite reliability studies. Several examples demonstrate the application of these new techniques by carrying out sensitivity studies and interconnected-system reliability evaluations. The advantages of the new method are illustrated.