Method for estimating state of large power grid based on Givens orthogonal increment line transformation

The invention provides a method for estimating the state of a large power grid based on Givens orthogonal increment line transformation. The method for estimating the state of the large power grid based on the Givens orthogonal increment line transformation comprises the following steps that the Givens orthogonal increment line transformation is conducted, local correction of a factor table is conducted, and the state of the large power grid is estimated. According to the method for estimating the state of the large power grid based on the Givens orthogonal increment line transformation, on the premise that the stability of a state estimation algorithm is guaranteed, the calculation speed for state estimation is greatly increased, the method can be flexibly adapted to the change of a power grid model, a previous factor table calculation result can be used continuously under the condition that the topology, measurement and parameters change, fast estimation of the state of the power grid at present can be achieved, the practicability level of state estimation is further improved, and the technical support is provided for the development of intelligent regulation and control systems and construction of intelligent power grids.