Abstract
A robust distributed state estimation algorithm for AC/DC system with AC
tie lines and high voltage direct current (LCC-HVDC) tie line is
proposed. The proposed algorithm consists of the robust distributed AC
state estimation and the robust DC state estimation in the coordinator.
For AC state estimation, a distributed state estimation algorithm based
on the bilinear algorithm is designed, which can not only achieve the
same accuracy as the centralized algorithm, but also simplify the
nonlinear iterative process of the exponential objective function robust
algorithm and reduce the operation scale. For DC state estimation, the
objective function adopts the maximum absolute value of exponential to
make it better convergent. Finally, the correctness and effectiveness of
the algorithm are verified by the simulation of three IEEE 118 bus
interconnected systems.