Abstract: As one of the important components of flexible AC transmission systems （FACTS）， the unified power flow controller （UPFC） plays an important role in the safe and stable operation of power system， and the effective state estimation of the power system containing UPFC is also an inevitable requirement for the power electronizing trend of power system. The robust state estimation of the traditional UPFC model can effectively suppress bad data， but there are problems such as complex model and low computational efficiency. On the basis of the new UPFC topological model， a bilinear method is used to estimate the robust state of the power system containing a UPFC. By selecting effective intermediate variables， the method linearized the nonlinear measurement equation of the power system and UPFC component step by step， which could effectively improve the computational efficiency of state estimation on the premise of engineering application by ensuring that the error level of calculation results is in the same order. The modified IEEE standard system and the actual system of Nanjing west ring network were simulated and tested. By comparing with the WLAV test results， the calculation speed close to weighted least squares （WLS） algorithm was obtained on the premise of ensuring the corresponding accuracy， indicating the effectiveness and practicability of the proposed method.

Key words: novel unified power flow controller （UPFC） topology, bilinear, robust state estimation, interior point method