A control method, device and server based on svpwm

Abstract

The invention provides an SVPWM-based control method and device and a server and is applicable to the field of variable frequency control. The method comprises the steps of: calculating a horizontal voltage component and a vertical voltage component of a target output voltage; building a preset coordinate system, calculating a first time component and a second time component separately; further calculating a first quantitative relation between the first time component and the working time of a circuit of each phase and a second quantitative relation between the second time component and the working time of the circuit of each phase; obtaining the magnitude relationship of the working time of the circuits of the phases according to the magnitude relationship among the first time component,the second time component and zero; appointing a constraint condition to make the working time of the first zero vector equal the product of the working time of the second zero vector and a preset coefficient; obtaining the working time of the circuit of each phase according to the obtained quantitative relation. According to the embodiments of the invention, a judging process for a sector where atarget output voltage is located is deleted, a calculation process is simplified, calculation time consumption is shortened and the performance demand for a micro-processor is reduced.

Description

Technical field [0001] The invention belongs to the technical field of frequency conversion control, and in particular relates to a control method, device and server based on SVPWM. Background technique [0002] In recent years, with the continuous improvement of energy-saving requirements, the demand for frequency conversion speed control of motors has increased. Among many frequency conversion speed control technologies, SVPWM (space vector pause width modulation, space vector pulse width modulation) technology can It can significantly reduce the harmonic components of the inverter output current and the harmonic loss of the motor, reduce the pulsating torque, and it is easy to realize the digitalization, and the DC bus voltage utilization rate is high. [0003] The three-phase inverter used when SVPWM technology is used to control the frequency and speed of the motor has three bridge arms, and each bridge arm is composed of two power switching devices in series, a total of six p...

AI Technical Summary

Problems solved by technology

[0005] In the SVPWM-based control method in the prior art, after coordinate transformation of the target output voltage to obtain the horizontal voltage component and the vertical voltage component, it is necessary to calculate the sector where the current target output voltage is located. Only when the current target output voltage is obtained The subsequent calculation of the working time of the three-phase circuit can only be carried out after the sector where the target output voltage is located, and the determination of the sector where the target output voltage is located needs to be performed a number of times equal to the carrier frequency per second. Currently, the commonly used carrier frequency is between 4k-20kHz Therefore, the amount of calculation is very large. The calculation process of the control method based on SVPWM in the prior art is complicated and time-consuming, and the performance requirements of the microprocessor for running the algorithm are relatively high.

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