Abstract
The flaws are revealed, the disadvantages of the standard electric drive power supply scheme are indicated, in particular, the energy loss on the brake resistors during dynamic braking, the triggering of electronic protection of frequency converters due to transients in the supply network from external influences, the line stop when the automatic switching of the reserve and accidents in the power supply system. The automatic activation of the reserve at the main step-down substation leads to an uncontrolled stop of the automated line and disruption of a complex technological process in veneer production. When switching to the reserve, an uncontrolled process of stopping the electric drive occurs, which leads to control loss over the technological process of veneer production and damage to mechanical components of the equipment. A technical solution is proposed that makes it possible, by switching the electric motors of the electric drive to the generator braking mode at the time interval of the automatic activation of the reserve, to slow down the capacitor discharge in the common constant voltage link and increase the waiting time for the backup power with a gradual decrease in speed to prepare for a correct stop in case of unsuccessful activation of the automatic activation of the reserve or drive acceleration from any reduced speed with successful automatic reserve activation. "Matlab" environment was used to develop mathematical modules of the electrical complex of the woodworking line and its control systems. A block – modular simulation model of an electrical complex of a woodworking line with real parameters is presented. Numerical experiments have been carried out to study the method under consideration for controlling the electric drive of the electrical complex of the woodworking line during the short-term disappearance of voltage in the supply network when the automatic activation of the reserve is triggered or in the case of accidents in the power supply system. The oscillograms of the current and voltage of the device elements are considered. The results of the study showed that the application of the considered method of controlling the electric drive makes it possible to ensure its operation without stopping when the automatic activation of the reserve is triggered or for a short-term loss of voltage in the supply network arising from accidents in the power supply system. The possibility of practical use of the proposed method for controlling the electric drive of an electrical complex of an automated line is considered.
Keywords
Frequency-controlled asynchronous electric drive, autonomous voltage inverter, common rectifier, common DC voltage link, common capacitor, voltage drop in the network, generator braking energy, a method for controlling the electric drive when automatic reserve activation is triggered, improving the reliability of equipment, modeling of an electrical complex in MatLab.
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