Design method for power system stabilizer capable of suppressing ultra-low frequency oscillation

A technology for power system stability and design method, applied in the direction of reducing/preventing power oscillation, and can solve problems such as no effect and negative effect

Active Publication Date: 2014-07-30
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing PSS has basically no effect or even a negative effect on ultra-low frequency oscillations below 0.1Hz.

Method used

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  • Design method for power system stabilizer capable of suppressing ultra-low frequency oscillation
  • Design method for power system stabilizer capable of suppressing ultra-low frequency oscillation
  • Design method for power system stabilizer capable of suppressing ultra-low frequency oscillation

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Experimental program
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Embodiment Construction

[0040] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0041] Below to Image 6An example of a system is shown to illustrate the invention in detail. The system includes 3 regional power grids, of which area 1 contains 4 power plants, 4 power plants are equipped with different units of 1000MW and 600MW, and the other two areas use equivalent power grids. Area 1 is connected to equivalent grid 1 through 512 kilometers of 1000kV AC lines, and the output power of area 1 is 7000MW. Equivalent grid 1 and equivalent grid 2 are connected through 1000kV AC lines, and the exchange power is 2000MW. See the specific system topology diagram Image 6 shown. The PSS is configured in the system grid, and the equivalent grid 2 is configured with the existing PSS and the new parallel-operated PSS for comparison.

[0042] When a single-phase ground fault occurs at the exit of area 1 and the exit of equivalent power grid 1, the...

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Abstract

The invention provides a design method for a power system stabilizer capable of suppressing ultra-low frequency oscillation. The design method comprises the steps that the operating frequency of the power system stabilizer is divided into an ultra-low frequency band with rotor angular velocity deviation delta omega as input signals and a medium-high frequency band with acceleration power deviation integral as input signals; the input signals of the ultra-low frequency band are screened and subjected to phase compensation; the input signals of the medium-high frequency band are obtained and subjected to phase compensation. According to the design method for the power system stabilizer capable of suppressing ultra-low frequency oscillation, two parallel branch structures are adopted and compensate for different frequency domain ranges respectively, the parameters of the two parallel branch structures are greatly independent with respect to setting, and the problem that an existing PSS is insufficient in damping within an ultra-low frequency domain is solved by means of adding ultra-low frequency branches.

Description

technical field [0001] The invention relates to a design method, in particular to a design method of a power system stabilizer capable of suppressing ultra-low frequency oscillation. Background technique [0002] In order to solve the unevenness of power production and load centers and improve the economics of power generation and transmission, the scale of the power grid has been continuously expanded, and various new technologies have been widely applied. The wide application of the generator fast excitation system improves the transient stability of the power system, but reduces the damping of the power system under certain conditions, causing low-frequency oscillations with weak damping or even negative damping in the system. At present, adding a Power System Stabilizer (PSS) to the generator excitation control system is the most effective and economical means to suppress low-frequency oscillations. The excitation adjustment control method adopts the principle of PID+PS...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
Inventor 吴剑超武朝强朱方霍承祥李照庭朱艳卿黄超
Owner STATE GRID CORP OF CHINA
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