Abstract
Relevance Currently, frequency converters with diode rectifiers are very often used in conveyor drive systems. However, frequency converters generate current harmonics, adversely affecting the quality of the network and the durability of electrical equipment. In the electric drive system, the induction motor consumes the reactive power of the source, which causes losses in the network and reduces the power factor at the input of the converter. Therefore, for the electric drive system, it is necessary to analyze methods for improving the power factor and reducing harmonic distortion of the current in the network. The reactor frequency converter has a simple structure but does not have high efficiency. A frequency converter with a multi-pulse rectifier will use multiple rectifier circuits in combination with a transformer to eliminate high order harmonics. The reactor frequency converter has a simple structure but does not have high efficiency. A frequency converter with a multi-pulse rectifier will use multiple rectifier circuits in combination with a transformer to eliminate high order harmonics. The active filter method will produce current waves of the same amplitude but opposite phase angle to the harmonics generated by the load, which eliminates most high-order harmonics and can compensate for reactive power. Aim of research Improving the energy efficiency of the conveyor electric drive with minimizing its impact on the quality of the electric power of the quarry network through the use of active rectifiers with a direct power control system in multi-inverter frequency converters. Research methods In this study, the following methods were used: the study of scientific literature, computer simulation performed in the MatLab software package. Results The frequency converters use active rectifiers with direct control of active and reactive power, the power factor is close to unity, and the energy exchange occurs in two directions between the motor and the network. The article compares the effectiveness of methods when considering a system of the frequency-controlled electric drive of conveyors.
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