Development and application of on-line wind power risk assessment system

Because of the large-scale integration of wind power, dynamic characteristics of power system emerge a lot of uncertain influence. Only considering the most serious and credible accidents, traditional on-line security assessment system which is based on deterministic analysis methods can not quantitatively estimate the actual operating conditions of power system. Therefore, Risk theory is introduced into on-line security assessment, and on-line risk assessment system for wind power is designed and implemented by combining the dynamic security assessment system. In this paper, based on multiple data integration, wind power disturbances probability is available and security assessment of power grid is carried out to obtain security indices in different aspects. The operating risk index is an expectation of severity, computed by summing over all possible outcomes the product of the outcome probability and its severity. The results of analysis are reported to the dispatchers under on-line environment, while the comprehensive weak links are automatically provided to power dispatching center. Putting this risk assessment system into operation could effectively verify the reasonableness of this system.