A carrier phase shift svpwm modulation method suitable for line voltage cascaded triple converter

Abstract

The invention belongs to the field of power electronic circuit control, and relates to a carrier phase-shift PWM modulation method suitable for line voltage cascaded triple converters. In the method, the triple converters are firstly equivalent to a switch circuit, thereby Obtain a set of three-phase modulation waves, and then recombine three switch groups, and modulate by adjusting the carrier phase of the corresponding switch groups. This method can be applied to motor speed regulation, renewable energy power generation and other fields. Its advantage is that it effectively reduces the problem of excessive current in the connection loop between units caused by traditional carrier phase shifting SVPWM, removes a large number of non-ideal switching states, and reduces AC side voltage spikes and harmonics; and maintain the DC bus voltage utilization effect that SVPWM can achieve; at the same time, using the carrier phase shift effect, the redundant switch state generated effectively reduces the current harmonics.

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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