Analysis method of DC power flow in dynamic topology electric network

A technology of DC power flow and dynamic topology, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve problems that are not suitable for power flow analysis of dynamic topology systems

Active Publication Date: 2008-10-22
TSINGHUA UNIV
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  • Abstract
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Problems solved by technology

Therefore, traditional DC power flow analysis methods are not suitable for power flow analysis of dynamic topology systems

Method used

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  • Analysis method of DC power flow in dynamic topology electric network
  • Analysis method of DC power flow in dynamic topology electric network
  • Analysis method of DC power flow in dynamic topology electric network

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Experimental program
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Embodiment Construction

[0023] The present invention implements according to the following steps:

[0024] (1) Obtain the correlation matrix D and the transmission line admittance matrix C of the system;

[0025] (2) The net injected power on each node in the system is measured, and the node power vector P is obtained;

[0026] (3) The weighted Laplacian matrix (Laplacian) L=D of the calculation system T CD;

[0027] (4) Find the Penrose-Moore generalized inverse L of the matrix L + ;

[0028] (5) Calculating the line DC power flow vector f=CDL + p.

[0029] by figure 1 The system containing five nodes and four transmission lines is shown as an example. The circled numbers in the figure indicate the node numbers, the numbers next to the transmission lines indicate the reactance of the transmission lines (unit: per unit on 100 MVA base), and the arrows on the transmission lines indicate the transmission lines the reference direction. In this system, nodes 1, 2, 3 and nodes 4, 5 respectively fo...

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Abstract

The invention provides a method for analyzing DC power flow in a dynamictopology electric grid, belonging to the electric grid safety technical field. The method is characterized in that the method sets up an incidence matrix and a transmission line admittance matrix; according to net injection powers of electric grid nodes, the generalized inverse solution power flow equation is used. The method can be applied to connected or disconnected electric grids, and the analysis for the topological connectivity of the electric grid is unnecessary, and the selection of reference nodes in the electric grid is also unnecessary, thereby the method brings great convenience for analyzing DC power flow in the dynamictopology electric grid.

Description

technical field [0001] The method for analyzing DC power flow in a dynamic topological power grid belongs to the technical fields of power grid analysis and power grid security. [0002] In large-scale power grids, when some transmission lines are disconnected due to faults, the topology of the power grid will change, causing the power flow in the entire network to redistribute. If the power flow is overloaded on some transmission lines after the power flow is redistributed, those lines will also be disconnected, which will further cause changes in the grid topology. If this continues, it may cause cascading failures of the power grid, which may lead to large-scale power outages. For a power grid where transmission line faults may occur, its topology changes dynamically, so power flow analysis under dynamic topology is of great significance for preventing cascading faults in the power grid. Background technique [0003] DC power flow analysis only considers the active powe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02H7/26G01R31/08
Inventor 李明扬赵千川陆宝森
Owner TSINGHUA UNIV
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