Power system state estimation method for preventing transformation matrix singularity

Abstract

The invention discloses a power system state estimation method for preventing transformation matrix singularity, which comprises the following steps: reading telemetering and telesignaling data of a power system, forming a node branch model, constructing a weighted Jacobian matrix related to a voltage vector according to the node branch model, assigning an initial value to the voltage vector, and setting the number of iterations and the correction of a state vector to zero; 1 is added to the number of iterations, whether the number of iterations is out of limit or not is judged, if not, voltage vector correction is carried out, a weighted Jacobian matrix is solved according to a current voltage vector value, matrix singularity prevention rotation axis selection and Givens transformation of a row interchange strategy are carried out on the weighted Jacobian matrix to obtain a matrix Q, and then a state vector correction delta x is obtained according to the matrix Q; and judging whether the delta x converges or not, if the delta x does not converge, continuing the next iterative calculation, and if the delta x converges, calculating a measurement result according to the current voltage vector value to obtain the current state of the power system. The method improves the effectiveness of state estimation of the power system.

Description

technical field [0001] The invention relates to a state estimation method, in particular to a power system state estimation method which prevents transformation matrix from being singular. Background technique [0002] Power system state estimation is to estimate the real state of the system for a given system structure and measurement configuration under the condition of measurement errors, including the voltage phase angle and modulus on each bus, and the power flow on each grid component. State estimation is an important part of the energy management system (EMS) to ensure the real-time data quality of the power system. It provides data information for the establishment of a high-quality database, and lays the foundation for the realization of other applications, so as to further realize online power flow, security Functions such as analysis and economic dispatch play a particularly important role in the electricity market. [0003] At present, the state estimation calcu...

AI Technical Summary

Problems solved by technology

This method adopts the Givens transformation strategy of variable rotation axis row priority and row dynamic adjustment. If the rotation axis is not selected properly, the transformed upper triangular matrix will be singular, which will lead to non-convergence of state estimation calculation and invalidation of state estimation.

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