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Auxiliary decision-making method for power system low-frequency oscillation based on operating mode sensitivity

An operation mode and auxiliary decision-making technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as adjustment strategies that cannot be quantified without power grid operation status, and achieve adjustment, suppression of low-frequency oscillation, and improvement of system The effect of damping

Active Publication Date: 2016-08-31
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the specific implementation process, the adjustment of the operation mode depends more on the experience and attempts of the engineers, and there is no set of systematic, quantifiable adjustment strategies for the actual power grid operation status

Method used

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  • Auxiliary decision-making method for power system low-frequency oscillation based on operating mode sensitivity
  • Auxiliary decision-making method for power system low-frequency oscillation based on operating mode sensitivity
  • Auxiliary decision-making method for power system low-frequency oscillation based on operating mode sensitivity

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Embodiment Construction

[0076] The specific embodiments of the present invention will be further described in detail with reference to the accompanying drawings.

[0077] In this embodiment, the active power of the unit in the operation mode is taken as an example for the following description. In general, the implementation process can be divided into four steps, namely:

[0078] Small disturbance stability calculation of the system;

[0079] Screening mode-establish an auxiliary decision-making optimization model;

[0080] Iterative solution of optimization problems;

[0081] Summary of auxiliary decision-making strategy tables.

[0082] The flow of this embodiment is as figure 1 As shown, specifically including:

[0083] (1) Small interference stable calculation:

[0084] Inputs include relevant grid parameters such as loads, generators, lines, transformers, etc., and call the power flow program to calculate the steady-state balance point of the system; inputs include generators, excitation regulators, power ...

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Abstract

The invention discloses an electric system low frequency oscillation aid decision making method based on operation mode sensitivity. On account of low frequency oscillation possibly existing in an electric system, the operation of constructing objective function is performed to the sensitivity index of the operation mode by applying a characteristic value, and a policy table for adjusting the operation mode of the system is obtained through optimizing calculation, so that low frequency oscillation aid decision making is performed. The method combines the sensitivity index with an active adjustment scheme, the unit with the larger sensitivity index is utilized to take part in output adjustment, and the unit with the smaller sensitivity index performs output balance, so that the purposes that the operation mode (active power) of the electric system is adjusted to improve small-signal stability of the system and restrict the low frequency oscillation are realized. The method is also suitable for reactive and voltage adjustment aid decision making in the low frequency according to the sensitivity index.

Description

Technical field [0001] The invention relates to the field of power system calculations, in particular to a power system low-frequency oscillation auxiliary decision-making method based on operating mode sensitivity. Background technique [0002] With the development of the national economy and the continuous increase of electricity load, the power system is developing in the direction of a large-scale interconnected power grid. The commissioning of large-capacity thermal power plants, hydropower stations and new energy power generation, the construction of UHV AC and DC power grids, will transform the grid Connected as a whole. [0003] In the initial stage of interconnection, the connection between the systems is still relatively weak. The low-frequency oscillation of the power grid and the dynamic instability of the system are more serious. Although the system becomes strong with the expansion and improvement of the interconnected power grid, the increase of the flow makes the W...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
Inventor 刘涛宋新立仲悟之汤涌吴国旸叶小晖王晓彤
Owner STATE GRID CORP OF CHINA
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