Vulnerability Analysis of Power System Considering Probabilistic Risk Assessment

Combining vulnerability with risk theory, this paper introduces a method of vulnerability analysis based on risk assessment in power system. Based on the risk theory, the impact of component outage probability and component outage on the system is considered comprehensively. Four categories of risk indexes, including risk of circuit overload, risk of over-voltage, low-voltage risk, and loss of load risk are used to establish a risk assessment index system to analyze the risk of power system components. The entropy weight method is applied to calculate corresponding risk indexes, which reveals the severity of the accident and the weaknesses of the grid structure. Then the ALARP principle is used to quantify and classify the consolidated risk, which can determine the risk level and importance degree in the system of each system component, offering a certain reference for operation personnel and setting personnel. Numerical example shows investigation of study and validity of the solution method.