Study On Vulnerability Assessment Of Composite System With Converged Power And Communication

Communication system provides technical support for observability and controllability of Wide-Area Power System. However, communication faults such as time delay, bit error and interruption may lead to abnormal operation, sometimes even causing cascaded failure in electric power system. Therefore, it has practical value to perform the vulnerability assessment of electric power and communication system in order to provide early warnings and protect the vulnerabilities of system. To evaluate the influence of communication system for electric power system, an incidence matrix is proposed to represent the connection pattern of electric power system and communication system. Firstly, a static vulnerability matrix is established in this paper to evaluate the vulnerability of composite system at a particular time section. In order to do so, various methods are used like electrical dissecting algorithm, vulnerability index of communication system, as well as vulnerability of electric power communication service interaction. Next, the real-time vulnerability of composite system is updated based on the charge of electric power and communication state. Dynamic vulnerability matrix to evaluate the real-time vulnerability of composite system is established as a result at the end. The proposed method is presented and validated in this paper by using an example of a simple composite system. At last, the vulnerability units obtained from the ordering of vulnerability indexes can provide data supporting for electric power stability control system.