Reliability Enhancement of Power System using Risk Index Estimation Technique

The paper presents a simplified approach to evaluate the risk index whose minimization results in the enhancement of power system reliability. The risk indices evaluated in the paper includes mainly LOLP (loss of load probability) and LOLE (loss of load expectation) with more emphasis on LOLE as it indicates the expected number of days in the specified periods in which the daily peak load will exceed the available capacity. There are too many other reliability considerations to bridge the gap between the total generation and total load in any practical power system operation. The addition of generating units in electrical power systems is often viewed as a complex situation and the effects of unit addition on reliability are being investigated in the paper. The reliability indices for load points and the overall system performance have also been studied and a computer program has been developed to examine the effectiveness of the system under investigation by using C-language. The results of simulation runs provide justification for use of the program so developed for the purpose. Key wordsLOLP (loss of load probability), LOLE (loss of load expectation), LOL (loss of load), Reliability indices.