Synthesis of the transfer function of the voltage controller in an active filter-stabilizer converter

Authors

DOI:

https://doi.org/10.15587/1729-4061.2021.229827

Keywords:

transfer function, voltage controller, converter, transition process, control system

Abstract

It has been established that in order to ensure effective filtration and stabilization of the voltage of DC traction substations, it is advisable to use active filters-stabilizers. The dynamic characteristics of an active filter-stabilizer have been analyzed taking into consideration its discrete properties. It has been shown that the voltage converter in an active filter-stabilizer with bilateral pulse-width modulation for small values of control signal increment is an amplitude-pulse modulator of the second kind.

In order to improve the efficiency of using an active filter-stabilizer, which is part of the DC traction substation converter, the task was set to synthesize the transfer function of its converter's voltage controller. When analyzing a closed automatic control system, it was established that the transfer function of the voltage controller, which ensures the implementation of processes of finite duration in the closed automatic control system, includes a proportional part, an integral part, and a differential part. To determine the time constants for the transfer function of the PID-controller, as well as its damping coefficient, a closed automatic control system of the active filter-stabilizer voltage converter was investigated using an apparatus of Z-transformation. The result of synthesizing the transfer function of the voltage controller has established the parameters for the controller's transfer function, which ensure that the process of finite duration is executed in a closed system of automatic control over the converter's output voltage. The transition process in the system with a stepwise input effect of the processes of finite duration has been calculated, which confirmed that the transition process in the system ends after three clock intervals of discreteness. Establishing a transition process that ends over the finite number of discrete intervals, which is determined by the order of the characteristic equation, means that the process has been optimized for performance

Author Biographies

Yakiv Shcherbak, National Technical University «Kharkiv Polytechnic Institute»

Doctor of Technical Sciences, Professor

Department of Automated Electromechanical Systems

Yurii Semenenko, Ukrainian State University of Railway Transport

PhD, Associate Professor

Department of Electrical Power Engineering, Electrical Engineering and Electromechanics

Olexandr Semenenko, Ukrainian State University of Railway Transport

PhD, Associate Professor

Department of Electrical Power Engineering, Electrical Engineering and Electromechanics

Nadiia Karpenko, Ukrainian State University of Railway Transport

PhD, Associate Professor

Department of Electrical Power Engineering, Electrical Engineering and Electromechanics

Olexandr Suprun, Ukrainian State University of Railway Transport

PhD, Associate Professor

Department of Electrical Power Engineering, Electrical Engineering and Electromechanics

Oleksandr Plakhtii, Limited Liability Company «VО ОVЕN»

PhD, Electronic Engineer

Volodymyr Nerubatskyi, Limited Liability Company «VО ОVЕN»

PhD, Scientific Consultant

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Published

2021-04-30

How to Cite

Shcherbak, Y., Semenenko, Y., Semenenko, O., Karpenko, N., Suprun, O., Plakhtii, O., & Nerubatskyi, V. (2021). Synthesis of the transfer function of the voltage controller in an active filter-stabilizer converter . Eastern-European Journal of Enterprise Technologies, 2(2 (110), 71–77. https://doi.org/10.15587/1729-4061.2021.229827