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Method for fault simulation of direct current transmission system

A technology of direct current transmission system and direct current system, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as large amount of calculation, long simulation time, and no consideration of the role of stabilizing devices, etc., to achieve accuracy improvement and upgrade Calculation speed, effect of saving calculation time

Active Publication Date: 2014-01-08
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

In addition, the model does not take into account the role of the stabilizer installed in the actual DC system
At the same time, more accurate modeling of the DC system will lead to a large amount of calculation in the simulation process, making the simulation time longer

Method used

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  • Method for fault simulation of direct current transmission system
  • Method for fault simulation of direct current transmission system
  • Method for fault simulation of direct current transmission system

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Embodiment Construction

[0048] The steps of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0049] Step 1: According to the location of the short-circuit fault, determine whether there is a DC system located on the same electrical island, if not, the DC system does not take any action;

[0050] Step 2: If the DC system is located on the same electrical island as the fault location, judge whether the fault duration is less than the 100Hz harmonic, zero-sequence current and commutation failure protection action time of the DC system. If so, go to step 5, otherwise go to step 3 ;

[0051] Step 3: Calculate the short-circuit voltage of the AC bus in the island to obtain the short-circuit voltage of the AC bus on the rectifier side and the inverter side of the DC system;

[0052] The calculation of AC bus short-circuit voltage mentioned above calculates the voltage of each bus in the case of three-phase short-circui...

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Abstract

The invention discloses a method for fault simulation of a direct current transmission system. The method comprises the steps that 1, whether a direct current system is in the same electrical island with the position where a short-circuit fault occurs or not is judged according to the position where the short-circuit fault occurs, and if not, no operation is conducted by a direct current system; 2, if the direct current system and the fault position are in the same electrical island, whether the fault lasting time is shorter than the operation time of a 100Hz harmonic wave, a zero sequence current and communication failure protection of the direct current system or not is judged, if yes, the step 5 is conducted, and if not, the step 3 is conducted; 3, short-circuit voltage calculation is conducted on an alternative current bus in the island; 4, whether protection is started or not is judged according to the short-circuit fault type; 5, according to fault information, whether a direct current circuit stable control strategy needs to be started or not is judged. If yes, operation of power set adjustment is conducted according to a strategy table and if not, exiting is conducted. According to the method, modeling and transient state simulation which are conducted by simulation software on the direct current system are avoided and when simulation of the fault of an AC / DC system is guaranteed, enough accuracy of response of the direct current transmission system is achieved.

Description

technical field [0001] The invention relates to the technical field of power system fault simulation analysis, in particular to a method for fault simulation of a direct current transmission system. Background technique [0002] With the continuous development of the power industry, today's large-scale interconnected grid has gradually formed. As one of the most complex industrial systems established by human beings, while generating economies of scale and improving operation and management efficiency, large power grids also increase their own complexity, making fluctuations and accidents more likely to have wider impacts and more serious s consequence. Therefore, in order to prevent and reduce the losses caused by accidents, the fault response simulation of the power grid is of great significance. [0003] Compared with AC transmission, DC transmission has unique advantages such as rapid adjustment and control of the magnitude and direction of transmission power, good ope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06Q50/06
Inventor 张振安张雪敏余晓鹏梅生伟刘巍李晓萌钟雨芯饶宇飞张翔昱赵华梁易乐
Owner STATE GRID CORP OF CHINA
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