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Direct current load flow computing method with network loss considered

A technology of DC power flow and calculation method, applied in the direction of AC network circuits, electrical components, circuit devices, etc., can solve the problems of unbalanced active power, unreasonable active power distribution, etc., to improve accuracy, fast calculation speed, and increase the amount of calculation. Effect

Active Publication Date: 2014-07-02
STATE GRID CORP OF CHINA +2
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Problems solved by technology

This method can solve the problems of unbalanced active power and unreasonable distribution of active power caused by ignoring network losses in standard DC power flow calculations, making the DC power flow calculation results closer to the actual power flow results

Method used

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  • Direct current load flow computing method with network loss considered
  • Direct current load flow computing method with network loss considered
  • Direct current load flow computing method with network loss considered

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Embodiment Construction

[0033] The DC power flow calculation method of the present invention considers the active power loss generated by the branch resistance, and uses the network loss equivalent load to correct the active power injected into the node, and obtains the DC power flow calculation result considering the network loss through an iterative calculation method.

[0034] The flow chart of the DC power flow calculation in this embodiment is as follows figure 1 As shown, it specifically includes the following steps:

[0035] (1) collect data;

[0036] (2) Active power is injected into computing nodes;

[0037] (3) List the DC power flow equation and solve it;

[0038] (4) Calculate the active power loss of the branch circuit of the power grid;

[0039] (5) Determine whether iterative operation;

[0040] (6) Calculate the equivalent load of network loss.

[0041] In the standard DC power flow model, it is approximately considered that the voltage of each node of the power system takes the ...

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Abstract

The invention provides a direct current load flow computing method with network loss considered. The method comprises the following steps of collecting data, computing node injecting active power, listing a direct current load flow equation and solving, computing electric grid branch active power loss, judging whether an iterative operation is conducted or not, and computing network loss equivalent load. The method is improved based on a standard direct current load flow computing method, the active power loss generated by branch resistance is considered, the node injecting active power is corrected by the adoption of the network loss equivalent load, and a direct current load flow computing result with the network loss considered is acquired through the iterative operation method. By means of the direct current load flow computing method with the network loss considered, the problems of the unbalanced active power and unreasonable active power distribution due to ignoring the network loss in standard direct current load flow computing are solved, and the direct current load flow computing result more approaches the real load flow result.

Description

technical field [0001] The invention relates to a power system power flow calculation method, in particular to a DC power flow calculation method considering network loss. Background technique [0002] Power flow calculation is the basis for power system calculation and analysis. The mathematical model of conventional power flow calculation is a set of nonlinear equations. When the data quality is good and the power flow calculation converges normally, the power flow results are generally accurate enough. However, due to the characteristics of the nonlinear equation itself, it often occurs that the power flow calculation does not converge. There are generally two reasons for this situation: the power flow equation has no solution, and the power flow equation has a solution but has not obtained a convergent solution. In addition, conventional power flow calculations require a large amount of calculations, and when a large number of calculations are required, it takes a lot of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
Inventor 王虹富穆世霞王毅董毅峰范亚娜郅治张志强王鹏王东晓刘道伟侯俊贤陶向红马世英林勇高崇余浩许亮
Owner STATE GRID CORP OF CHINA
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