Abstract
The problem of network current distortion and high power consumption by lifting valves with frequency-controlled asynchronous electric drive and industrial complexes of lifting and transport equipment is considered. The technology of increasing energy indices of the energy-intensive electrical complex characterizing efficiency of electric power consumption and use is proposed. In order to increase the efficiency due to redistribution of energy of generator braking between electric drives and the complex of lifting cranes are all individual, for each asynchronous motor, independent voltage inverters with input C-filters are connected to common rectifying substation similar to standard DC traction substation. A substation consists of a power converter transformer, a diode rectifier unit and an output reactor. To increase the power factor of the power transformer and network, correction of input current of diode rectifier unit is applied by means of an active filter of network current. In addition, an algorithm is proposed and a control system is developed, which makes it possible to maintain sinusoidality of current at the input of the rectifier unit, to switch the transistor PWM of the switch of the active current filter of the network to the transistor recuperator according to the information on the sign of current in the DC voltage link and the state of diodes of the rectifier unit. The results of research in Matlab environment of physical processes of rectifier-inverter unit as part of electrical complex of lifting and transportation equipment are given.
Keywords
Frequency-controlled electric drive, diode rectifier unit, network current distortions, active network current filter, recuperator, electric power consumption, complex of lifting cranes.
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