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New method for identifying disturbance information of large-scale interconnected power system

A technology for interconnecting power grids and information identification. It is applied to electrical components, circuit devices, AC network circuits, etc., and can solve the problems of disturbance location and time information that cannot be estimated by a single calculation.

Inactive Publication Date: 2010-12-01
SHANDONG UNIV
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Problems solved by technology

Therefore, theoretically, when the propagation characteristics of the frequency offset are unknown and its influence needs to be considered, the estimation of the position and time information of the disturbance cannot be realized by a single calculation

Method used

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  • New method for identifying disturbance information of large-scale interconnected power system
  • New method for identifying disturbance information of large-scale interconnected power system
  • New method for identifying disturbance information of large-scale interconnected power system

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Embodiment Construction

[0065] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0066] Figure 4 In, the method of the present invention is:

[0067] 1) Determine the observation space, which is composed of the synchromesh measurement (PMU) device installed in the 500kV substation;

[0068] 2) Geographically partition the power grid according to the regional administrative jurisdiction, simulate and calculate the frequency offset propagation speed corresponding to each observation point when a large load disturbance (2000MW) occurs in each area, and establish a system dynamic frequency response characteristic database;

[0069] 3) According to the collected or simulated wide-area frequency information after a system failure, detect the time when the frequency offset at each observation point reaches a given threshold for the first time;

[0070] 4) Identify the zones one by one: read the frequency offset propagation velocity vect...

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Abstract

The invention relates to a new method for identifying disturbance information of a large-scale interconnected power system, which comprises the following steps: (1) determining an observation space which comprises PMU measuring equipment arranged on a 500 kV transformer substation; (2) carrying out geographical zoning for the power system in accordance with regional administrative jurisdiction zones, emulationally calculating spread velocity of frequency shift (FS) corresponding to each observation point when large disturbance occurs in each zone, and establishing a dynamic frequency response characteristic database of the system; (3) detecting the time which the FS at each observation point reaches a given threshold value for the first time aiming at wide area frequency information obtained by collection or emulation after system fault; (4) identifying zones one by one, reading spread velocity vectors of the FS corresponding to the zones, bringing the vectors to the equations that s. t. f (x, y) is more than 0 (5), adopting an SQP optimization method to solve and identifying disturbance position and disturbance occurrence time, and treating all zones one by one, wherein t is more than tmin and less than tmax; and (5) comprehensively analyzing identification results and taking the disturbance position and time information corresponding to the minimum target function as the final identification result.

Description

technical field [0001] The invention relates to a new method for identifying disturbance information of a large-scale interconnected power grid. Background technique [0002] At present, the rapid development of wide area measurement system (WAMS) provides technical support for online monitoring, security and stability analysis and control of large power grids. The multi-regional interconnected synchronous power grid has a large amount of information and is widely distributed. How to quickly and accurately mine information for system decision-making from massive data, and build a highly informatized, automated, and intelligent system analysis, protection, control, and command and dispatch platform is a major theoretical and technical challenge, and it is also a major challenge for intelligent dispatching. A key issue that needs to be addressed. [0003] Wide-area measurement data contains a large amount of system dynamic behavior information; using wide-area information fo...

Claims

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Application Information

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IPC IPC(8): H02J13/00H02J3/00
Inventor 张恒旭刘玉田
Owner SHANDONG UNIV
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