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Low frequency oscillation identification method for accessing of wind power to power grid

A low-frequency oscillation and identification method technology, which is applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of unable to automatically identify the dominant oscillation mode of the power grid, and not considering large-scale wind power access, etc.

Active Publication Date: 2013-10-02
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a low-frequency oscillation identification method for wind power access to the power grid, which is used to solve the problem that the existing low-frequency oscillation identification method of the power grid does not consider the large-scale wind power connection and cannot automatically identify the dominant oscillation mode of the power grid.

Method used

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  • Low frequency oscillation identification method for accessing of wind power to power grid
  • Low frequency oscillation identification method for accessing of wind power to power grid
  • Low frequency oscillation identification method for accessing of wind power to power grid

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Embodiment 1

[0075] Step 1: First establish a mathematical model of the power system for large-scale wind power integration. That is, the system-wide linearization state matrix A of the power system without wind turbines is corrected to obtain the system-wide linearization state matrix A' of the power system including wind turbines, which is recorded as the corrected system-wide linearization state matrix A'.

[0076] In a power system, the equations for each dynamic element including the generator and its control system can be expressed as:

[0077] x · i = f d ( x i , U )

[0078] i i =g d (x i ,U)

[0079] In the above formula, x i is the state variable of the dynamic element, is the dynamic component state variable x i The derivative of the time t, U is the ter...

Embodiment 2

[0176] The content of the invention of the present invention will be further described below by taking the power grid in the Hexi region of Gansu in 2012 as an example of the present invention.

[0177] Wiring diagram of power grid in Hexi area, Gansu Figure 4 shown. In 2012, the total installed capacity of wind power in Gansu grid was 6,915.1 MW, and the total installed capacity of thermal power was 4,500 MW. Gansu's wind power output plan in October 2012 is 2800MW, which is the maximum value of wind power output.

[0178] Obtaining EMS data, it is determined that the operation mode of Gansu power grid is the small load in winter of 2012, and the 750 kV power grid in Hexi area is completely shut down for maintenance. The tidal flow of the tidal current section is 0MW sent from Xinjiang, 3807MW sent from south to north, 2607MW sent from west to east, and the output of wind turbines is 800MW.

[0179] The software used for the calculation is Power System Analysis Comprehens...

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Abstract

The present invention discloses a low frequency oscillation identification method for accessing of wind power to a power grid in the technical field of wind power integration monitoring. The low frequency oscillation identification method comprises the steps that the system-wide linearized state matrix of a power system without a winder turbine generator is corrected, and a corrected system-wide linearized state matrix is obtained; eigenvalues and eigenvectors of the corrected system-wide linearized state matrix are figured out; the frequency, attenuation damping ratio and electromechanical circuit correlation ratio of the eigenvalues are worked out according to the eigenvalues and eigenvectors; and the eigenvalues are analyzed according to the frequency, attenuation damping ratio and the electromechanical circuit correlation ratio of the eigenvalues, and the low frequency oscillation mode of the accessing of the wind power to the power grid is determined. The low frequency oscillation identification method for the accessing of the wind power to the power grid solves the problems that an existing low frequency oscillation identification method does not take large-scale wind power accessing into consideration and cannot identity the system-leaded oscillation mode automatically.

Description

technical field [0001] The invention belongs to the technical field of wind power grid-connected monitoring, and in particular relates to a low-frequency oscillation identification method for wind power grid connection. Background technique [0002] With the rapid development of wind power technology and the country's emphasis on renewable energy power generation in policy, my country's wind power construction has entered a period of rapid development. At the same time, the planning, construction and operation of large-capacity wind farms in my country have gradually increased the proportion of wind power in the power system, and the mutual influence between wind farms and power systems has also increased. [0003] Wind farms are generally connected at the end of the grid, away from the load center. Due to the randomness and uncertainty of wind speed, large-scale wind power access will have a great impact on the stability of the entire power grid. Among them, low-frequency...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 张小敏刘文颖曹银利梁才郑伟葛润东靳丹邢晶陈振寰钟佳辰吕斌刘聪马超李扬乾维江赵子兰陈仕彬刘景延陈璟昊
Owner STATE GRID CORP OF CHINA
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