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Passive identification method of distributed generation plant mathematical model

https://doi.org/10.21285/1814-3520-2019-2-296-309

Abstract

The article deals with the development of the method of passive non-parametric identification of a mathematical model of distributed generation (DG) plant based on experimental data in order to determine the optimal tuning factors for generator controllers operating in various modes. The purpose is achieved through the application of the following methods of digital signal processing: wavelet transform for controller noise identification, discrete fast Fourier transform for obtaining the spectral characteristics of the system and weight windows for smoothing the empirical estimates of complex transfer coefficients. To analyze experimental model consistency, the spectrum function of the squared coherence is used. The average random quadratic error in the determination of the complex transfer coefficient modulus has been calculated on its basis. It is also applied the simulation of electric power systems (EPS) with adjustable DG plants in the MATLAB software environment using Simulink, SimPowerSystems software packages and a specialized software package for calculating optimal controller coefficients based on a genetic algorithm. Computer simulation results show that the developed method of passive non-parametric identification of the DG plant model and the software algorithm created on its basis allow to obtain a reliable mathematical model, which can be used for determining the optimal tuning factors for synchronous generator controllers and estimation of the stability margin. The conducted research and computer modeling allowed to derive a conclusion that the presented identification algorithm for the mathematical model of the closed-loop adjustable DG plant allows to determine the optimal setting of synchronous generator controllers, which improves the damping properties of the system making the frequency and voltage control faster and smoother.

About the Author

Y. N. Bulatov
Bratsk State University
Russian Federation


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For citations:


Bulatov Y.N. Passive identification method of distributed generation plant mathematical model. Proceedings of Irkutsk State Technical University. 2019;23(2):296-309. (In Russ.) https://doi.org/10.21285/1814-3520-2019-2-296-309

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ISSN 2782-4004 (Print)
ISSN 2782-6341 (Online)