The Research And Application Of Risk Assessment On The Communication Network Of Wide-area Measurement System In Electricity Grid

Smart Grid is the direction of power industry’s development, the safety and stability of Smart Grid operation is facing sever challenges. Wide Area Measurement System(WAMS) is an essential part of Smart Grid, what’s more,is also a basic effective measurement to monitor the power system dynamic security,therefore, the safety reliability problem of WAMS communication network becomes increasingly prominent. As the foundation of keeping safe,risk assessment is the premise of making trustworthy safety protective measures and has important meaning to improve the security of WAMS communication network.This paper studies some theory relating to risk assessment and the risk assessment methods which are widely used at present, in addition, analysing WAMS communication network architecture and security requirements. On this basis, this paper establishes WAMS communication network risk assessment index system via analysing the risk and recognizing the risk factors of WAMS communication network.This paper designs and builds WASM communication network risk assessment quantitative model by the integrated use of Fuzzy APH and D_S evidence theory. Using Fussy APH which brings Triangular Fuzzy Theory in APH to determine each index’s weight in risk assessment index system can not only overcome the shortcoming and lackness of the traditional APH, but also lower the subjectivity and uncertainty of experts’judgement. Using D_S evidence theory to merge index risk factors together from down to up turns out the quantitative result of superstratum risk factor. This method considers the uncertainty of risk factors as well as uncertainty and ambiguity of experts subjective judge in the process of assessing fully, finally get the value-at-risk and risk level of goal system.At last, this paper demonstrates this risk assessment quantitative model through a living example, designs and achieves the prototype of WAMS communication network risk assessment system which has the function such as building index system, ensuring the weight of each index, evidence fusion, calculating value-at-risk and so on.