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Emergency control method for asynchronous networking sending end system for processing DC fault

An emergency control and DC fault technology, applied in power transmission AC network, reducing/preventing power oscillation, etc., can solve problems such as insufficient research on control capacity and control effect, insufficient consideration of real-time fault location, and poor real-time control effect, etc. Increase the reserve and stability margin, strengthen the ability to deal with subsequent faults, and reduce the effect of the maximum value of transient frequency deviation

Active Publication Date: 2017-07-14
WUHAN UNIV
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Problems solved by technology

However, there are few researches on emergency control related to pure DC asynchronous interconnection systems, and most of the control is based on the "offline simulation, online matching" countermeasure table method, which does not take into account the real-time fault location, and the control location, control capacity and control effect. The research is not deep enough, resulting in low matching and poor real-time control effect

Method used

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  • Emergency control method for asynchronous networking sending end system for processing DC fault
  • Emergency control method for asynchronous networking sending end system for processing DC fault
  • Emergency control method for asynchronous networking sending end system for processing DC fault

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Embodiment Construction

[0029] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0030] Examples of the described embodiments are shown in the drawings, wherein like or similar reference numerals designate like or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0031] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, components and arrangements of specific examples are described below. They are examples only and are not intended to limit the invention. Furthermore, the present invention may repeat reference numerals and / or letters in different instances. This repetition is for the pur...

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PUM

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Abstract

The invention relates to the technology of power system stable control, and specifically relates to an emergency control method for an asynchronous networking sending end system for processing a DC fault. The method comprises the following steps: 1, predicting the maximum deviation of the system transient frequency of the asynchronous networking sending end system under the DC fault through curved surface fitting, and taking the maximum deviation as the criterion for starting the emergency control; 2, solving a generator tripping quantity needed by emergency control according to a power balance control principle and the predicted maximum difference of the transient frequency of the asynchronous networking sending end system, carrying out the generator tripping priority ordering according to an electrical distance between a power supply and a DC current converter with an emergency power reduction fault, and then carrying out the effective generator tripping. The method provided by the invention can predict the maximum deviation of the system at the earlier stage of the DC fault, and the corresponding measures are taken, thereby preventing the system frequency from exceeding a critical value to enter an emergency state under the fault condition, effectively increasing the stability margin of the system, and maintaining the reliable operation of the system.

Description

technical field [0001] The invention belongs to the technical field of electric power system stability control, and in particular relates to an emergency control method for an asynchronous networking sending end system dealing with DC faults. Background technique [0002] The asynchronous network operation mode weakens the power support capability of the transmitting and receiving end system, which leads to prominent frequency stability problems of the transmitting and receiving end system under DC faults. Therefore, the transmitting and receiving end system needs to adopt power control measures based on frequency fluctuations. [0003] Compared with the passive measures of low-frequency load shedding and high-frequency machine cut-off based on frequency action, the active emergency machine-cut load-shedding method has predictive control characteristics, and can perform corresponding control before the system frequency reaches a critical value, increasing the system stability...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02J3/24
CPCY02E60/60H02J3/36H02J3/24
Inventor 吴军陈懿刘涤尘陈炜王琪鑫徐雨田殷巧玲周仕豪
Owner WUHAN UNIV
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