Commutation failure early detection and prevention method and device and application thereof

A technology of commutation failure and prevention method, which is applied in the direction of measuring device, measuring electricity, measuring electrical variable, etc., can solve the problems of poor control effect of commutation failure, unfavorable commutation failure, overshoot or undershoot, etc.
CN110518622AActive Publication Date: 2019-11-29NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Publication Date
2019-11-29

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Abstract

The invention discloses a commutation failure early detection and prevention method and device and an application thereof. An existing commutation failure detection method still has the problems of low response speed of a control system, excessive dependence on simulation calculation, lack of physical model support and theoretical basis, insufficient universality and the like. The voltage waveformafter a fault is quickly fitted out through a three-point method, and a supplied minimum commutation area is calculated; a demanded commutation area is compared with the supplied minimum commutationarea, and communication failure detection is carried out in advance; and measures are taken according to a detection result to prevent commutation failure. According to the invention, commutation failure can be detected in advance, an effective signal can be provided for DC control, commutation failure can be prevented, the calculation amount is small, the speed is high, and the method and the device are not influenced by the fault type and the fault time.
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Description

technical field

[0001] The invention belongs to the technical field of electric power system relay protection, and relates to a method and device for early detection and prevention of commutation failure. Background technique

[0002] Traditional high-voltage direct current transmission has the characteristics of large transmission capacity, strong power regulation ability, and relatively low cost. However, the core component of this transmission technology, the thyristor, has no self-shutoff capability, which leads to insufficient voltage support for the AC system on the inverter side. In this case, commutation failure is very likely to occur. The failure of commutation will not only cause a surge in DC current and impact on the converter valve, but also cause large fluctuations in DC power. In severe cases, it may even cause the DC system to be blocked. The safe and stable operation brings a more severe test, and its preventive measures are mainly divided into two aspects...

Claims

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