Simulation of Sliding Mode Control System for Active Current Converter
Abstract
Introduction: Conventional algorithms for pulse width modulation or predictive relay-vector control over active current converters do not fully meet the requirements of practical application. For example, when used in vector control systems, the first algorithms presume significant fluctuations in the network and output currents, while the second ones are unnecessarily complicated. The principle of sliding-mode discontinuous control combines the simplicity of automatic control system implementation with ensuring its robustness and stability. Purpose: Developing a unified algorithm for sliding-mode discontinuous control by a phase shift of the network currents in reference to the network voltages, by the network and output currents of a three-phase active current converter operating in the modes of an active current rectifier and a network current inverter; also synthesis of their control system and simulation of its dynamic operation modes. Results: Based on the proposed control algorithm for an active three-phase bridge current converter, a functional scheme was developed for a system with discontinuous control in a sliding mode. It allows you to unify the regulators and simplify the structure of the automatic control system. In MATLAB/Simulink environment, a simulation program was created which you can use to analyze the dynamic performance of the synthesized automatic control system for an active current converter operating in the modes of an active rectifier or a network current inverter. Mathematical modeling showed that the developed control algorithm provides dynamic performance indicators of the synthesized automatic control system not inferior to the conventional algorithms, a significant reduction in the reactive elements of the active current converter, and a much better shape of the network currents. This unified algorithm of discontinuous control in a sliding mode instead of pulse-width modulation algorithms, along with predictive relay-vector control provides the opportunity to simplify the structure of the automatic control system and ensure its robustness. Practical relevance: The developed procedure for the synthesis of a single discontinuous regulator of the network and output currents is simple and well adapted for microprocessor implementation. An active current converter can be successfully used to modernize traditional thyristor DC electric drives in order to improve their dynamic performance through replacing their thyristor rectifiers with pulse-phase controllers by active transducers.Published
2018-04-01
How to Cite
Efimov, A. (2018). Simulation of Sliding Mode Control System for Active Current Converter. Information and Control Systems, (2), 49-59. https://doi.org/10.15217/issn1684-8853.2018.2.49
Issue
Section
System and process modeling