Model identification in AC/DC parallel transmission system based on WAMS

Identifying the model of AC/DC parallel transmission system on line is the precondition for realizing HVDC wide-area damp control. A method of identifying AC/DC parallel transmission system's model on line by WAMS data with limited length is put forward. Supposed that it's a SIMO system, the theory of identifying AC/DC parallel transmission system model is analyzed. Based on the theory, the arithmetic of identifying the Prony model's parameters and the formula of calculating the time spent on the process are deduced with the theory of AR model. The time relayed on transmission in communication net is calculated by using the GPS clock of PMU. The process of identifying the HVDC model is speeded up more due to the distributed realization of all the arithmetic's steps in WAMS center. The research about Gui-Guang HVDC line in South Power has proved that the method is valid and reliable.