Distributed State Estimation Calculation Method of Power System Based on Asynchronous Iterative Mode

Abstract

The invention discloses an electric system distributed type state estimation computing method based on an asynchronization iteration mode, and belongs to the technical field of electric system operation and control. The electric system distributed type state estimation computing method comprises the step of establishing a subsystem local computing model and a coordination layer computing model, namely, an interconnection system is divided into a plurality of subsystems through a call wire to enable the call wire of the subsystems and nodes at the two ends of the call wire to be a boundary overlapping region of the adjacent subsystems and carrying out modeling at the two ends of the boundary overlapping region repeatedly, and a boundary node state quantity fixed point iterative scheme is established based on the equivalent net equivalent measurement correction idea; the step of estimating the distributed type state based on the asynchronization iteration mode, namely, the measurement standardized residual is calculated, local bad data is identified based on the estimation identification method, the worked out local node state quantity is corrected based on the estimation identified result and sending the corrected boundary node state quantity to a coordination layer, wherein the local node state is worked out in a state estimation mode. By means of the electric system distributed type state estimation computing method, the problem that the bad data close to the boundary region are not recognized easily in an existing distributed type state estimation method is solved, all computing steps are easy to achieve, the algorithm is simple, and the efficiency is high.

Description

technical field [0001] The invention relates to a distributed state estimation calculation method of a power system based on an asynchronous iterative mode, belonging to the technical field of power system operation and control. Background technique [0002] As a means of modern computer real-time data processing, state estimation uses the redundant information provided by the real-time telecontrol measurement system to estimate the state variables of the power system in the best way, and provides the online power flow, safety monitoring, and load monitoring of the power system control center. A reliable and accurate real-time database system is established for functions such as prediction, economic dispatch, and tie line power control. Under the hierarchical dispatching system, the control center sends most of the information to the respective regional control centers except for a few necessary telecontrol information exchanges between subsystems according to the hierarchic...

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: In the first-level state estimation, the injected power measurement of the subsystem boundary node and the tie line power measurement entering or leaving the boundary node have to be discarded

The difficulty of this method is that the selection of coordination strategies between subsystems will affect the calculation convergence speed. At present, there are many studies based on the analysis of external network equivalence and boundary sensitivity, but no corresponding theoretical explanation has been given for the influence of calculation convergence speed. , just according to some empirical formula

Moreover, when there is bad data in the border area, it is difficult to detect and identify, which seriously affects the local state estimation results, which in turn affects the convergence effect and calculation speed of the entire distributed computing

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