Method for pre-evaluating line loss of electric power system

A power system and pre-assessment technology, applied in electrical digital data processing, instrumentation, design optimization/simulation, etc., can solve problems such as low algorithm stability, large error rate fluctuations, cumbersome calculation steps, etc., to avoid convergence The effect of problems, small fluctuations, and efficient solution speed

Inactive Publication Date: 2017-02-08
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, this method needs to obtain the generator transfer distribution factor matrix first, so the calculation steps are cumbersome and the implementation is more complicated; at the same time, because the calculation results of branch power flow are not reasonably corrected, the error rate fluctuates greatly, and the algorithm stability is not stable. high

Method used

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  • Method for pre-evaluating line loss of electric power system
  • Method for pre-evaluating line loss of electric power system
  • Method for pre-evaluating line loss of electric power system

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Experimental program
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Embodiment 1

[0036] The concrete steps of embodiment 1 are as figure 1 shown, including:

[0037] S1. Collect raw data such as node injection and branch parameters, mainly including the reactance x from the i-th node to the j-th node ij , Generator output and load of each node; where i and j are any integers from 1 to n, n is the number of nodes in the power system, and the nth node is a balance node;

[0038] S2. According to the original data, construct the power matrix and admittance matrix injected by the node; the admittance matrix B 0 j-th element B in row i 0 (i, j) is

[0039] Column vector P of active injected power from the 1st node to the n-1th node 0 =P G -P L;in, The output column vector of generators from the 1st node to the n-1th node, A column vector of loads from the 1st node to the n-1th node;

[0040] S3. Carry out DC power flow calculation, first obtain the DC power flow voltage of each branch Then obtain the branch power flow value P from the i-th node t...

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Abstract

The invention discloses a method for pre-evaluating the line loss of an electric power system. The method comprises the following steps of: collecting original data; preparing data needed by direct current power flows; carrying out direct current power flow calculation to obtain the power flow of each branch; calculating a line loss power of each branch according to a line loss calculation model provided by the method; and calculating the line loss of the system. The method provided by the invention is used for calculating on the basis of a direct current power flow model, the method is simple, the equation is completely linearized and the solving speed is rapid. The method is sufficiently exact for pre-evaluation of the line loss of a new project of a power grid, especially exact for pre-evaluation of the line loss of a new project of a main network with high voltage grade and high ratio of line reactance to resistance (X/R).

Description

technical field [0001] The invention belongs to the field of power system analysis, and more specifically relates to a pre-assessment method for power system line loss. Background technique [0002] The line loss index of the power system is an important economic index for assessing the operation status of power supply enterprises. Taking certain measures to improve the structure of the power system and reduce the line loss of the power grid to a reasonable range is an important goal of the power grid construction project. The benefit after the implementation of the power grid construction project is the key to decide whether to invest in the project. In the stage of project feasibility demonstration, the benefit after the project implementation must be pre-evaluated, and the benefit brought by the reduction of line loss is an important part of the total benefit of the power grid project. component. Therefore, the line loss pre-assessment before the construction of the pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 娄素华吴耀武范臻隗震王永灿魏添
Owner HUAZHONG UNIV OF SCI & TECH
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