Abstract
This research investigated the outputting circulation current inhibition characteristic which are controlled by the instantaneous feedback voltage in inverter parallel driving of the mine hoist. We established a transfer function of the parallel inverters controlled by the close-loop adjustment of instantaneous voltage feedback. The influence of the parameters of the close-loop feedback circuit to the inhibition effects to the outputting circulation current is observed. After analyzing the circulating current inhibition characteristics, the proportion integration (PI) controller is introduced into the close-loop adjustment by instantaneous voltage feedback. The characteristics equation is gained to determine the PI parameters by drawing the Bode plots. The inhibition effects of the proposed controller are examined by the established simulation model of parallel inverter system. The harmonic distortion rate at the outputting voltage frequency value of 4, 10, 20, 41 and 50 Hz, are all lower than 2.32 % by the instantaneous outputting voltage feedback.
Highlights
Parallel inverter driving system of mine hoist differs from traditional driving inverter system, which contains a parallel connection system of two independent inverter units to drive the motor
This research investigated the outputting circulation current inhibition characteristic which are controlled by the instantaneous feedback voltage in inverter parallel driving of the mine hoist
After analyzing the circulating current inhibition characteristics, the proportion integration (PI) controller is introduced into the close-loop adjustment by instantaneous voltage feedback
Summary
Parallel inverter driving system of mine hoist differs from traditional driving inverter system, which contains a parallel connection system of two independent inverter units to drive the motor. Zhang et al analyzed the case of two inverters sharing a rectifier module, which will produce a zero sequence circulation current through the DC bus and consume a lot of energy, reduce the efficiency of the system and cause saturation of filter reactor (2006a). Zhang et al (2006b) and Liu et al (2011) analyzed the presence of harmonic circulating current caused by dead zone dispersion of switch, delay of driving circuit and over modulation, of which the dead zone of switch is the most influenced component. Considering the dead zone of switch being the most influenced component to the presence of harmonic circulating current in parallel inverter driving system, regarding the error of the output voltage caused by the dispersion of the dead zone as a harmonic disturbance, an inhibition method of harmonic circulating current controlled by the instantaneous feedback voltage is proposed.
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