Full-dimensional sensitivity matrix rapid voltage partitioning method based on weak coupling relationship

Abstract

The invention relates to a full-dimensional sensitivity matrix rapid voltage partitioning method based on a weak coupling relation. The method comprises the steps: step 1, performing Newton-Raphson method load flow calculation under polar coordinates to obtain a system jacobian matrix J and carrying out node type transformation; step 2, calculating a power linear equation set of the system by utilizing a Newton-Raphson method load flow to obtain a full-dimensional jacobian matrix Jmax of the system; step 3, constructing a full-dimensional sensitivity matrix model Svq' containing reactive powersource nodes according to L', M' and N' sub-matrixes in the full-dimensional jacobian matrix Jmax; step 4, quantifying the full-dimensional sensitivity matrix model matrix Svq' obtained in the step 3, and solving a full-dimensional electrical distance matrix Dij of the system; step 5, processing the full-dimensional electrical distance matrix Dij obtained in the step 4 by using a clustering analysis method to realize division of a rapid voltage control region. According to the full-dimensional sensitivity model constructed by the invention, the weak coupling relationship of power to voltage is comprehensively considered, and load node partitioning is avoided.

Description

technical field [0001] The invention belongs to the technical field of power system control, and in particular relates to a fast voltage partitioning method of a full-dimensional sensitivity matrix based on a weak coupling relationship. Background technique [0002] With the continuous upgrading of my country's power system, the grid structure is becoming more and more complex, and the stable operation and control of the power system is becoming more and more difficult. If local voltage instability occurs, it may affect the voltage stability of the entire network. Dividing the power grid into several areas with stable characteristics and adopting a reasonable and effective reactive power and voltage control scheme can not only strengthen local voltage control, ensure regional reactive power demand and voltage qualification requirements, but also have significance for maintaining the safe and stable operation of the entire power grid. major. [0003] Among the various volta...

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Problems solved by technology

[0004]In order to overcome the complicated process of dividing the load nodes first and then manually merging reactive power source nodes in the traditional reactive power voltage control partition method, the purpose of this invention is to propose a A full-dimensional sensitivity matrix fast voltage partition method based on the weak coupling relationship. This method considers the sensitivity of load nodes and reactive power source nodes at the same time when calculating voltage control modeling, and constructs a full-dimensional sensitivity matrix including reactive power source nodes. It avoids the process of merging reactive power source nodes one by one, and simplifies the partition calculation steps; when constructing the sensitivity matrix, this method not only considers the situation that PV is not decoupled under heavy load conditions, but also comprehensively considers the difference between reactive power and voltage. Weak coupling relationship is used to modify the traditional sensitivity structure, which accurately reflects the closeness of the electrical connection between nodes

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