Carrier phase-shifting SVPWM modulation method applicable to line voltage cascade type triple converter

Abstract

The invention belongs to the field of power electronic circuit control, and relates to a carrier phase-shifting PWM modulation method applicable to a line voltage cascade type triple converter; the method comprises the steps that firstly, the triple converter is equivalent to a switch circuit, so as to obtain a group of three-phase modulation waves; and then re-combining is carried out to obtain three switch groups, and modulation is performed by adjusting the carrier phases of the corresponding switch group. The method can be applied to the fields of motor speed regulation, renewable energy power generation and the like; the problem that the current of the inter-unit connection loop is too large due to the traditional carrier phase-shifting SVPWM is effectively solved, a large amount of non-ideal switching states are removed, the voltage peak and the harmonic wave of the alternating-current side are reduced, and the utilization effect of the direct-current bus voltage which can be achieved by SVPWM is kept; and meanwhile, a current harmonic is effectively reduced by the redundant switch state generated based on the carrier phase-shifting effect.

Description

technical field [0001] The invention belongs to the field of power electronic circuit control, and relates to a carrier phase-shifting PWM modulation method suitable for line voltage cascaded triple converters. The method can be applied to the fields of motor speed regulation, renewable energy power generation, and the like. Background technique [0002] Power electronics technology continues to expand in the application fields of electric transmission and new energy power generation, and the voltage and power levels it faces are also constantly increasing. However, limited by the development speed of semiconductor technology, the voltage and power levels of a single semiconductor device are often difficult to adapt to some high-voltage and high-power applications. Such as high-voltage mine hoisting, the motor terminal voltage is above 6kV, which requires the DC bus voltage of the motor side inverter to be above 10kV, and the traditional two-level or even three-level structu...

AI Technical Summary

Problems solved by technology

However, limited by the development speed of semiconductor technology, the voltage and power levels of a single semiconductor device are often difficult to adapt to some high-voltage and high-power occasions.

Such as high-voltage mine hoisting, the motor terminal voltage is above 6kV, which requires the DC bus voltage of the inverter on the motor side to be above 10kV, and the traditional two-level or even three-level structure is difficult to adapt

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