Research on risk and utilization rate of power equipment based on data envelopment analysis

This paper puts forwards a series of indexes to represent utilization rate and risk level of power system as well as to discuss their interrelationship. In particular, probabilistic risk assessment method is adopted in this paper to calculate security coefficient of over-limit voltage. Data envelopment analysis (DEA) is used innovatively to probe into the best balance point of system. By respectively studying the use efficiency of power equipment with and without consideration of operational risks, how risk factors influence utilization rate is revealed and these load levels corresponding to relatively lower efficiency and to what extent their efficiencies can get improved are also pointed out. In the end, a real case study of utilization rate of power equipment and system operational risk in the condition of actual load changes is given to verify the effectiveness and validity of the method mentioned in this paper.