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Method and system for assessing risk of multi-feed-in alternating AC/DC system commutation failure

A technology for AC and DC systems and commutation failures, which is applied in the field of stability calculation and analysis of power systems, can solve problems such as time-consuming, threats to the safe and stable operation of the system, and interruption of multiple DC-DC transmission power, so as to achieve simple implementation steps and reduce Calculation of workload effects

Pending Publication Date: 2017-06-06
CHINA ELECTRIC POWER RES INST +1
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  • Abstract
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  • Claims
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Problems solved by technology

When the failure of the AC system at the receiving end is serious, the continuous commutation failure of multiple DC circuits may lead to the interruption of DC transmission power, which ultimately threatens the safe and stable operation of the entire system
The current conventional method to assess the risk of commutation failure in multi-infeed DC systems is to use electromechanical transient simulation programs to perform fault scanning calculations, but this method is computationally intensive and time-consuming

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  • Method and system for assessing risk of multi-feed-in alternating AC/DC system commutation failure
  • Method and system for assessing risk of multi-feed-in alternating AC/DC system commutation failure
  • Method and system for assessing risk of multi-feed-in alternating AC/DC system commutation failure

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Embodiment Construction

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0031] A method for assessing commutation failure risk of a multi-infeed AC / DC system provided by an embodiment of the present invention will be described below.

[0032] In this embodiment, the risk of commutation failure in a multi-infeed AC / DC system can be assessed according to the following steps, specifically:

[0033] ...

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Abstract

The invention provides a method and system for assessing a risk of a multi-feed-in AC / DC system commutation failure. The method includes calculating an AC / DC voltage coupling effect factor and a critical AC / DC voltage coupling effect factor; and comparing the AC / DC voltage coupling effect factor and the critical AC / DC voltage coupling effect factor, and judging whether a risk of a commutation failure exists in a DC inverter side current conversion bus according to a comparison result. Compared with the prior art, the method and system for assessing the risk of a multi-feed-in AC / DC system commutation failure judge whether the risk of a commutation failure exists in the DC inverter side current conversion bus after a fault occurs in an AC bus of a receiving end system according to the comparison result of the AC / DC voltage coupling effect factor and the critical AC / DC voltage coupling effect factor, do not need to perform whole-network fault monitoring on an electric power system, greatly reduce the work amount of calculation and can rapidly assess whether a commutation failure risk exists in the DC inverter side current conversion bus.

Description

technical field [0001] The invention relates to the technical field of stability calculation and analysis of electric power systems, in particular to a method and system for evaluating commutation failure risks of multi-infeed AC and DC systems. Background technique [0002] When the AC system at the receiving end of the multi-infeed AC-DC system fails, multiple DC circuits may fail to commutate simultaneously or successively. When the failure of the AC system at the receiving end is serious, the continuous commutation failure of multiple DC circuits may lead to the interruption of DC transmission power, which ultimately threatens the safe and stable operation of the entire system. At present, the conventional method to assess the commutation failure risk of multi-infeed DC system is to perform fault scanning calculation with the help of electromechanical transient simulation program, but this method is computationally intensive and time-consuming. Contents of the inventio...

Claims

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Application Information

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IPC IPC(8): G06Q10/06G06Q50/06
CPCG06Q10/0635G06Q50/06
Inventor 邵瑶汤涌
Owner CHINA ELECTRIC POWER RES INST
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