A commutation failure prevention method based on AC bus voltage disturbance

A technology of AC bus voltage and commutation failure, applied in the direction of power transmission AC network, etc., can solve the problem of low start-up rate, achieve high real-time performance, improve accuracy, and have a wide range of applications

Active Publication Date: 2022-04-01
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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Problems solved by technology

It can be seen from the figure that for the case of commutation failure caused by AC disturbance, the activation rate of the current commutation failure prediction link is very low

Method used

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  • A commutation failure prevention method based on AC bus voltage disturbance
  • A commutation failure prevention method based on AC bus voltage disturbance
  • A commutation failure prevention method based on AC bus voltage disturbance

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Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0029] Such as figure 2 As shown, the present invention provides a commutation failure prevention method based on the AC bus voltage disturbance. The method monitors the absolute value of the change of the AC bus voltage relative to the previous cycle in real time. When the absolute value of the change is greater than the start threshold , converting the absolute value of the change into an early trigger angle, and transmitting the early trigger angle to a commutation valve trigger control system to prevent commutation failure. The method specifically includes the following steps: ...

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Abstract

The invention relates to a commutation failure prevention method based on AC bus voltage disturbance. The method monitors the absolute value of the change of the AC bus voltage relative to the previous cycle in real time. When the absolute value of the change is greater than the start threshold, the The absolute value of the change is converted into an advance trigger angle, and the advance trigger angle is transmitted to the converter valve trigger control system to prevent commutation failure. Compared with the prior art, the present invention can reduce commutation failure events on the inverter side caused by voltage disturbances on the AC side of the DC power transmission project, and is very important for improving the stable operation of the DC power transmission project, the receiving-end power grid, and the sending-end power grid. significance.

Description

technical field [0001] The invention relates to the technical field of DC system operation, in particular to a commutation failure prevention method based on AC bus voltage disturbance. Background technique [0002] Commutation failures in ultra-UHV DC transmission projects occur from time to time, resulting in DC blockage and sudden loss of transmission power, which adversely affects the stable operation of the power grid. According to operating experience, commutation failure events caused by AC side voltage disturbance account for more than 50%, which has become the main reason affecting the stable operation of HVDC projects. [0003] In order to reduce such commutation failure events, a commutation failure prediction link is added to the DC control and protection system. The principle is to convert the disturbance into a corresponding angle value, adjust the trigger angle α, and increase the extinguish The arc angle γ prevents commutation failure due to the drop of arc ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 赵丹丹韩政崔勇金珩黄华顾丹珍董明瑞赵文彬周行星邹俭
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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