Generator dynamic state estimation method based on adaptive traceless H-infinity filtering

A technology for generator dynamics and state estimation, which is applied in computer-aided design, calculation, electrical digital data processing, etc., and can solve problems such as performance degradation of state estimators

Inactive Publication Date: 2019-07-30
HOHAI UNIV
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  • Application Information

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Problems solved by technology

[0005] Purpose of the invention: Aiming at the problem of performance degradation of the state estimator caused by model uncertainty, the present invention proposes a generator dynamic state estimation method based on adaptive unscented H∞ filter

Method used

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  • Generator dynamic state estimation method based on adaptive traceless H-infinity filtering
  • Generator dynamic state estimation method based on adaptive traceless H-infinity filtering
  • Generator dynamic state estimation method based on adaptive traceless H-infinity filtering

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Embodiment

[0096] (a) Model building

[0097] According to the fourth-order dynamic equation of the generator, the state estimation equation of the generator is constructed as follows:

[0098]

[0099] In the formula: δ represents generator power angle, rad; ω and ω 0 Respectively, electrical angular velocity and synchronous rotational speed, pu; e′ q and e' d respectively represent the transient electromotive force of the generator q-axis and d-axis; H represents the inertia constant of the generator, T m and T e represent the mechanical power and electromagnetic power of the generator, respectively, where T e =P e / ω;K D Indicates the damping factor, E fd is the stator excitation voltage; T′ d0 and T' q0 Indicates the open-circuit time constant of the generator in the d-q coordinate system; x d and x' d Respectively represent the d-axis synchronous reactance and transient reactance of the generator, x q and x' q are the generator q-axis synchronous reactance and transi...

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Abstract

The invention discloses a generator dynamic state estimation method based on adaptive traceless H-infinity filtering, which is used for enhancing the robustness of a dynamic state estimator on model uncertainty and improving the dynamic state estimation precision. According to the method, based on the unscented transformation and H-infinity filtering theories, by introducing an adaptive technology, a state estimation error covariance adaptive adjustment updating strategy capable of inhibiting the influence of model uncertainty on a state estimation result is provided. According to the method,the dynamic state estimation precision of the generator can be effectively improved, and the problem that upper bound parameters are difficult to select due to model uncertainty constraint in a traditional robust state estimation method is avoided. According to the method, the actual engineering background is considered, the implementation process is clear, and high engineering application value is achieved.

Description

technical field [0001] The invention relates to a method for estimating a dynamic state of a generator, in particular to a method for estimating a dynamic state of a generator based on an adaptive unscented H∞ filter. Background technique [0002] As one of the most important components of the power system, the accurate estimation and analysis of the operating state of the generator is very important. In recent years, as the synchronized phasor measurement unit (PMU) that can provide high-frequency sampling information with time scale is gradually popularized and applied, it provides the possibility for electromechanical transient analysis of power system generators. However, as a measurement unit, the PMU will inevitably be affected by factors such as random interference during the measurement process, resulting in contamination of measurement data. Therefore, the measurement information obtained by the PMU cannot be directly used for the electromechanical transient analys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 王义孙永辉侯栋宸王森曹阳王朋吕欣欣
Owner HOHAI UNIV
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