Method for modeling of electromechanical transient simulation system based on three-sequence equivalent impedance

A technology of transient simulation and modeling method, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as increasing design costs

Inactive Publication Date: 2015-11-25
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Description
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  • Application Information

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Problems solved by technology

For large-scale power grids, there may be problems with the convergence of power flow calculations, and more complex algorithms need to be introduced, which will further increase the design cost

Method used

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  • Method for modeling of electromechanical transient simulation system based on three-sequence equivalent impedance
  • Method for modeling of electromechanical transient simulation system based on three-sequence equivalent impedance
  • Method for modeling of electromechanical transient simulation system based on three-sequence equivalent impedance

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Embodiment

[0051] Combined with an actual system to illustrate the proposed method, the wiring diagram of the system is as follows figure 2 Shown:

[0052] The external AC system is Anshun bus and Gaoming bus. According to the above method, the calculation process of the three-sequence equivalent impedance of the AC system is as follows:

[0053] 1) First, remove the Gaozhao DC and the converter stations on both sides in the power flow file, retain the Anshun and Gaoming buses that require equivalent values, adjust the output of the equivalent units in Guizhou Provincial Grid, and make the remaining AC system power flow converge.

[0054] 2) Secondly, on the BUS2 side of the Huishui-Anshun line (that is, the Anshun node), a phase A single-phase short-circuit fault with a reactance of j1 per unit value is set. Record the three-phase voltage of Anshun and Gaoming nodes before and after the fault. Calculate the self-impedance of each sequence of Anshun node and the mutual impedance of e...

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Abstract

The invention discloses a method for modeling of an electromechanical transient simulation system based on three-sequence equivalent impedance and belongs to the field of electric power system simulation. On the basis of an electric power system load flow and transient algorithm, first interface nodes are set single-phase earth faults, three-phase voltage prior to the faults of each interface node and three-phase voltage at the starting time of the faults are recorded, and the self-impedance and mutual impedance of the interface nodes are solved according to the fault calculation principle. The mature electromechanical transient short-circuit calculation is utilized to solve each-sequence equivalent impedance of an external system. According to the method, existing data of a power grid are utilized directly, data conversion is not performed, the development of a data interface program is avoided; the secondary development is avoided, so that the solving error caused by load flow calculation and model modeling inaccuracy is avoided, the working intensity is relieved, and the research efficiency is improved.

Description

technical field [0001] The invention belongs to the field of power system simulation, in particular to a modeling method for an electromechanical transient simulation system based on three-sequence equivalent impedance, and in particular to a three-sequence part of an AC system in an electromechanical-electromagnetic transient hybrid simulation of an AC and DC system Modeling method for equivalent impedance. Background technique [0002] With the continuous development of DC line construction in my country, my country's power grid has become a complex power grid with AC and DC hybrid connections. The traditional electromechanical transient simulation uses a quasi-steady-state model for the DC system, which cannot accurately simulate transient characteristics such as DC commutation failure and asymmetric operation. Although the electromagnetic transient simulation can accurately simulate the transient characteristics of the DC system, the model is too complex and requires mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 李伟郭琦杨洋陶顺陈鹏伟房钊肖湘宁
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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