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Excitation control method based on non linear robust power system stabilizer

A power system and excitation control technology, applied in the direction of controlling the generator through the change of the magnetic field, reducing/preventing power oscillation, etc., can solve the problems of negative effects and limited effects

Active Publication Date: 2008-02-20
TSINGHUA UNIV
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Problems solved by technology

[0009] It can be seen from the search results that the existing power system stabilizer (PSS) can only be used to improve the small disturbance stability of the power system and suppress low-frequency oscillations in the power system because it is based on a certain operating point linearization model
However, when the system suffers from large disturbances and the operating point changes in a large range, the existing PSS has very limited effects and may even have negative effects.

Method used

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  • Excitation control method based on non linear robust power system stabilizer
  • Excitation control method based on non linear robust power system stabilizer
  • Excitation control method based on non linear robust power system stabilizer

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Embodiment Construction

[0104] The purpose of the present invention is based on NR-PSS control law (1), utilizes power system dynamics and information processing technology, carries out practical processing to it, obtains a set of NR-PSS engineering practical algorithm. The method contains the following steps in sequence:

[0105] (1) Initialize the parameters of the generator set, including the steady-state frequency value ω 0i =314.16, excitation winding time constant T d0i ′, unit moment of inertia H i , D-axis reactance x di , Q-axis reactance x qi , D-axis transient reactance x di ′, stator resistance r i .

[0106] (2) The following real-time measurement quantities are obtained by using AC sampling measurement technologies such as voltage transformer PT and current transformer CT: the instantaneous value of generator phase A voltage u ai , the instantaneous value of generator B-phase voltage u bi , the instantaneous value of generator C-phase voltage u ci ;Instantaneous value i of phas...

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Abstract

The utility model discloses an excitation control method based on nonlinear robust power system stabilizer, which belongs to the technical field of power system stability control. The utility model is characterized in that a nonlinear robust power system stabilizer is put forth on the basis of multi-machine excitation system nonlinear mathematical model and by combining differential geometry control theory and nonlinear HíÌ method. The output signals of the nonlinear robust power system stabilizer are superimposed with the output signals of an original automatic voltage regulator to generate excited control signals, which are used to control the excitation system of the generating set, thus preventing the influence of external uncertainties, solving the problems of dynamic nonlinearity and high coupling in power system, overcoming the defects of neglecting the nonlinearity inherent in the system in prior art, improving the dynamic stability and expanding the installed capacity of the generating set to the maximum extent.

Description

technical field [0001] The invention belongs to the technical field of power system stability control. Background technique [0002] The excitation control of large generator sets is one of the most effective and economical technical means to improve the dynamic quality and transient stability of the power system. At present, technologies including PID (Proportional Integral Derivative Control), PSS (Power System Stabilizer), LOEC (Linear Optimal Excitation Control) and NOEC (Nonlinear Optimal Excitation Control) are applied to power systems to varying degrees. There are still insurmountable limitations on the excitation control of large generator sets, the most critical equipment in modern interconnected grids. This is mainly because modern power systems are inevitably affected by uncertainties (such as external disturbances and unmodeled dynamics) in their operation, and power system dynamics are strongly nonlinear and highly coupled. However, the above four control meth...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02P9/14
Inventor 卢强梅生伟薛建伟郑少明彭晓洁
Owner TSINGHUA UNIV
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