Out-of-step oscillation center positioning system and method based on wide-area measurement impedance angle information

An oscillation center, wide-area measurement technology, applied in fault location, fault detection by conductor type, spectrum analysis/Fourier analysis, etc. The project has strong implementability and the effect of preventing large-scale power outages

Active Publication Date: 2020-03-24
CHINA SOUTHERN POWER GRID COMPANY
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Problems solved by technology

The out-of-synchronization decoupling device judges out-of-synchronization and distinguishes the direction in which the oscillation center is located in the device according to the different changes in the detected electrical quantities, and combines the voltage value of the installation point of the device to estimate whether the oscillation center is on the protected line, which cannot be accurate Locating the center of oscillation, which may pose a risk of misoperation

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  • Out-of-step oscillation center positioning system and method based on wide-area measurement impedance angle information
  • Out-of-step oscillation center positioning system and method based on wide-area measurement impedance angle information
  • Out-of-step oscillation center positioning system and method based on wide-area measurement impedance angle information

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Embodiment

[0029] see figure 1 with figure 2 , an out-of-synchronization oscillation center positioning system based on wide-area measurement of impedance angle information, which includes a master station and multiple sub-stations, the sub-stations are deployed on both sides of each line in the section, and the sub-stations are multiplexed by 2M The optical fiber channel is connected to the main station in communication, and the communication delay between each sub-station and the main station channel is less than 20ms. In this embodiment, the power system including the sending-end power grid and the receiving-end power grid is used as the application scenario for illustration. This type of power system In the case of serious faults in the sending-end power grid, such as multi-circuit DC bipolar blocking, main protection refusal to operate, and the power angle of the sending-end system relative to the receiving-end system is unstable, the oscillation center will generally be located at...

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Abstract

The invention discloses an out-of-step oscillation center positioning system and method based on wide-area measurement impedance angle information. According to the system and the method, real-time oscillation direction information sent by a plurality of out-of-step solution substations deployed on the two sides of a power transmission section channel in a regional interconnected power grid in theout-of-step oscillation process is comprehensively utilized in a control main station, and the position of an oscillation center is accurately judged in real time. According to the method, a master station and a plurality of substations are included, and the substations communicate with the master station through 2M multiplexing optical fiber channels. The substation collects voltage and currentdata of a section channel line, calculates and measures an impedance phase angle in real time through the voltage and current data, judges the direction of an oscillation center in real time accordingto the size distribution of the phase angle in fixed time, and sends the direction of the oscillation center to the main station in real time. And the main station can judge the position of the oscillation center in real time according to the oscillation direction information sent by each substation and a preset logic strategy. The position of the oscillation center can be accurately judged in real time.

Description

technical field [0001] The invention relates to the technical field of power distribution network, in particular to a method for locating an out-of-step oscillation center based on wide-area measurement of impedance angle information. Background technique [0002] Out-of-step decoupling is an important measure to prevent the power system from collapsing due to serious faults, disintegrating and causing accidents to expand, and it is the third line of defense to ensure the stability of the large power grid system. Generally, the line or section where the oscillation center is located is the most effective measure. Therefore, the accurate positioning of the oscillation center is an important aspect in the out-of-synchronization technology, which is directly related to the correctness and solution of the out-of-synchronization action in the case of power grid out-of-synchronization. the effect of the measures. [0003] Due to the extremely unbalanced distribution of energy and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R23/16
CPCG01R31/086G01R23/16
Inventor 邱建周剑徐光虎张建新黄磊夏尚学许琴
Owner CHINA SOUTHERN POWER GRID COMPANY
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