Simulation method for improving accuracy of judging direct-current phase commutation failure

A technology of commutation failure and simulation method, which is applied in the field of simulation to improve the accuracy of judging DC commutation failure, can solve problems such as commutation failure, improve accuracy, avoid misjudgment of DC commutation failure, and have credibility Effect

Inactive Publication Date: 2015-10-14
CHINA SOUTHERN POWER GRID COMPANY +1
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  • Abstract
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  • Application Information

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Problems solved by technology

That is, when the commutation arc-extinguishing angle of the converter valve is lower than 5°, commutation failure is a high probability event

Method used

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  • Simulation method for improving accuracy of judging direct-current phase commutation failure
  • Simulation method for improving accuracy of judging direct-current phase commutation failure

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Embodiment Construction

[0016] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0017] The present invention proposes a simulation method for improving the accuracy of judging DC commutation failure, one of which is as follows figure 1 shown. The present invention improves the simulation method for judging the accuracy of DC commutation failure. By judging the AC bus voltage on the inverter side of the DC system and simultaneously judging the commutation arc extinguishing angle of the converter valve of the DC system inverter station, when the AC bus voltage and When the commutation extinguishing angles of the converter valves in the inverter station reach or fall below their respective thresholds, it is considered that the commutation failure has occurred in the DC system.

[0018] The threshold value of the AC bus voltage on the inverter side of the DC system is set to a certain value, and the condition is established ...

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Abstract

The invention provides a simulation method for improving accuracy of judging direct current phase commutation failure. The method comprises: judging alternating current bus voltage at a direct current system inverter side, and simultaneously judging a phase commutation extinction angle of an inverter station converter valve of a direct current system; and when the alternating current bus voltage and the phase commutation extinction angle of the inverter station converter valve are detected to reach or be lower than a set threshold, considering that phase commutation failure occurs in the direct current system. According to the method, the direct current commutation failure is determined by the alternating current bus voltage at the direct current system inverter side and the phase commutation extinction angle of the inverter side converter valve, thereby improving probability of judging the direct current commutation failure, and reducing probability of mis-judging the direct current phase commutation failure. The method disclosed by the invention can improve the accuracy of judging the direct current commutation failure in simulation calculation; and in simulation means, the method is used to judge, so that the characteristics of direct current system can be simulated more practically, and the simulation accuracy of the whole system is improved.

Description

technical field [0001] The invention relates to a simulation method for improving the accuracy rate of judging DC commutation failure, in particular to a method for improving the accuracy rate of judging DC commutation failure in conventional DC transmission system simulation. Background technique [0002] With the rapid economic growth, the demand for electricity is getting higher and higher, and the distribution of energy and electricity consumption in my country is uneven. Places with intensive energy tend to have low demand for electricity, while areas with intensive loads tend to lack energy. , so the long-distance, high-voltage DC transmission system has developed rapidly under this background. China Southern Power Grid has now built an eight-circuit DC transmission system. It provides a solution to alleviate the problem of uneven energy distribution. Multi-circuit DC transmission can transmit electric energy efficiently, but at the same time there are certain hidden da...

Claims

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Application Information

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IPC IPC(8): H02J3/36G01R31/08
CPCY02E60/60
Inventor 余江付俊波徐光虎王俊生朱韬析陈亦平
Owner CHINA SOUTHERN POWER GRID COMPANY
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