Aim at the characteristics of complex network in power systems,and in order to solve the problem of equivalent parameter that is completely unknown for external network,an equivalence method based on the measurement information of the boundary nodes was proposed to equivalent the two-port external network.The measurement information of the power flow calculation includes the voltage vector of boundary nodes,active power and reactive power.The equality constraint relationship between the equivalent models of the external system and the boundary node information was adopted to estimate the equivalent parameters of external system model by using the numerical iterative.Through comparing the short circuit level,power distribution and dynamic performance for IEEE 14-bus system,the correctness of the proposed equivalent method and its engineering practicability were verified.
