Optimization of arc current pi regulator parameters by sofrware modeling
DOI:
https://doi.org/10.15588/1607-6761-2025-2-1Keywords:
control system, robust system, regulator settings, plasma arc, optimization, computer model, PI regulator, determination of regulator parametersAbstract
Purpose. To create a computer model of a converter operating on a plasma arc and to determine the optimal values of the coefficients of the PI current controller, ensuring optimal switching between its operating modes and high quality of control processes. In doing so, use the MATLAB / Simulink software.
Methodology. Computer simulation method, separation method – optimal filtering and optimal deterministic control and methods for adjusting regulators.
Findings. A multilevel model was formed, the values of the PI current regulator tuning parameters were determined, at which the DC-DC converter observes optimal switching between its operating modes and high quality of control processes. Analytical methods for determining the PI regulator parameters do not allow obtaining optimal settings, since they are based on highly simplified models, but their use is necessary to obtain preliminary settings, without which accurate tuning can take a long time. It was established that the optimal regulator provides optimal resistance to disturbances at the input and output of the object and compensates for changes in parameters in a similar way. The system has a satisfactory transient process under non-zero initial conditions in response to a given reference influence and to a change in the set point, has good stability characteristics and is not very sensitive to disturbances and changes in the parameters of the object.
Originality. An approach to determining a continuous linear model of a power converter of electrical energy is proposed and the optimal choice of parameters for setting the regulator of its control system is given, which form the basis for constructing any plasma torch power supply system, which ensures the specified accuracy of regulation and speed of operation.
Practical value. The proposed principle of solving the problem of determining the coefficients of PI regulators can be applied to various dynamic objects, the description of which is permissible using linear and differential equations. The results presented in the work can be used for the design of pulsed power supplies for electrical technologies.
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Copyright (c) 2025 V.I. Kostiuchenko, Y.M. Vereshchago, M.V. Dzhanhyrov, A.P. Yeremenko, Y.V. Stohniienko
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