Large power system emulation analysis method based on direct-current external characteristic fitting

A simulation analysis, large power grid technology, applied in electrical digital data processing, special data processing applications, instruments, etc., to achieve the effect of improving the level of safe and stable operation

Active Publication Date: 2014-02-26
STATE GRID CORP OF CHINA +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

In terms of large power grid simulation analysis methods based on DC external characteristic fitting, there are no relevant reports at home and abroad.

Method used

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  • Large power system emulation analysis method based on direct-current external characteristic fitting
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  • Large power system emulation analysis method based on direct-current external characteristic fitting

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Embodiment

[0049] In this embodiment, an interconnected power grid is used as a simulation embodiment for description.

[0050] The rationality of the present invention is verified by taking the successful simulation calculation of three DC restarts in the power grid as an example of the present invention.

[0051] Step 1: Equivalent the large power grid, and establish an equivalent small system electromagnetic transient model with a detailed DC model.

[0052] Step 2: Carry out the electromagnetic transient simulation of the DC three-time restart success for the equivalent small system, and obtain the DC power external characteristic curve, such as figure 1 , figure 2 shown.

[0053] Step 3: Change the DC model of the large power grid to be studied to a constant power load, and adjust the operation mode with reference to the equivalent small system.

[0054] Step 4: Use 0.0043s as the step size to simulate the DC power external characteristic curve with a step curve, and simulate th...

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Abstract

The invention belongs to the field of power systems, and particularly relates to a large power system emulation analysis method based on direct-current external characteristic fitting. According to the method, an equivalent small system is built in a direct-current near region to be researched and an electromagnetic transient model of the direct-current near region is set up; a direct-current power external characteristic curve of a fault to be researched is obtained through electromagnetic transient simulation, and fitting is carried out through a step curve; simulation is carried out in a plurality of shedding loads in a large power system, and simulation analysis is carried out under the same fault. The method can be used in theoretical research, simulation analysis and operation control of the power systems, enables the direct-current external characteristic curve provided by electromagnetic transient simulation to be organically combined with large power system transient simulation, can effectively carry out simulation analysis on the large power system containing a direct-current system, solves the problem that direct-current dynamic response characteristics are difficult to simulate accurately through a direct-current electromechanical transient model, facilitates system analysis, enables operators to master the operation characteristics of the large power system containing the direct-current system, and improves the power grid safe and stable operation level.

Description

technical field [0001] The invention belongs to the field of electric power systems, and in particular relates to a large power grid simulation analysis method based on DC external characteristic fitting. Background technique [0002] Due to the advantages of flexible power adjustment, no need for synchronization of both ends of the system, long transmission distance and large transmission capacity, HVDC technology has been more and more used in my country's power grid. It has become an important task to carry out effective simulation analysis on large power grids containing DC. [0003] Because DC contains a large number of power electronic devices, it is necessary to use the electromagnetic transient model to carry out accurate modeling and simulation. When performing electromagnetic transient simulation, due to the limitation of calculation scale, it is necessary to perform equivalent simplification on the large power grid, which reduces the accuracy of calculation and a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCY02E60/76Y04S40/22Y02E60/00
Inventor 张健刘明松王琦王建明吴萍何剑
Owner STATE GRID CORP OF CHINA
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