Self-adaptive loop width hysteresis current control method and system of electric vehicle inverter

Abstract

The invention provides a self-adaptive loop wide hysteresis current control method and system for an electric vehicle inverter. The method comprises the steps that the bus voltage of the inverter andthe output voltage and output current of the inverter are acquired; a hysteresis current loop width is obtained according to the inverter bus voltage, the inverter output voltage, a set reference current and a set reference frequency, and the hysteresis current loop width is input into a hysteresis comparator; the hysteresis comparator obtains a control signal according to the loop width of the hysteresis current and the difference value between the output current of the inverter and the reference current; and a switching tube of the inverter is controlled to act according to the control signal. According to the invention, the stability of the average switching frequency of the inverter can be improved on the basis of ensuring the high stability and rapid dynamic response of the inverter,so that the output voltage range of the inverter can be reduced, the regularity of the average switching frequency operation of the inverter can be ensured, and the pulsation amplitude of the output current waveform of the inverter can be reduced.

Description

technical field [0001] The invention relates to the technical field of inverter control, in particular to an adaptive loop wide hysteresis current control method for an electric vehicle inverter and an adaptive loop wide hysteresis current control system for an electric vehicle inverter. Background technique [0002] At present, when controlling the inverter for electric vehicles, the method of controlling transient current output based on hysteresis current control is usually used. This method is to compare the current given signal with the detected actual output current signal of the inverter. If the weak actual current value is greater than the given value, it is reduced by changing the switch state of the inverter, and vice versa. Thus, the actual current changes in a zigzag shape around the given current waveform, and the deviation is limited within a certain range. Therefore, this method can speed up the dynamic adjustment and suppress the disturbance in the loop, and...

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Problems solved by technology

[0003] However, in practical applications, when this method is used to control the inverter, the switching frequency of the inverter often changes with the operating conditions of the motor. The range of variation is very large, the operation is irregular, and the output current Waveform pulsation is large, and these changes will bring noise

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