Vehicle control system based on space vector pulse width modulation (SVPWM) algorithm

Abstract

The invention provides a vehicle control system based on a space vector pulse width modulation (SVPWM) algorithm. Pulse width modulated wave generated by a specific switch mode consisting of six power switch components of a three-phase power inverter based on the SVPWM algorithm is established; basic voltage vectors are combined in a switching period according to the average value equivalence principle of the SVPWM algorithm, so that the average value of the basic voltage vectors is equal to a given voltage vector; at a specific moment, the voltage vectors rotate into a specific area and are obtained through different combination of two adjacent non-zero vector and zero vector which form the area; the action time of the two vectors is applied for many times in one sampling period, so that the action time of each voltage vector is controlled, the voltage space vector rotates nearly according to a circular track, an ideal magnetic flux circle is approached by actual magnetic flux generated by different switching stages of the inverter, the switching state of the inverter is determined by the comparison result of the actual magnetic flux and the ideal magnetic flux, and pulse width modulation (PWM) control waveform is formed. The algorithm of the scheme is simple, and the voltage vector for synthesizing reference can be obtained only by performing simple logic judgment.

Description

technical field [0001] The invention relates to the field of vehicle control systems, in particular to a vehicle control system based on the SVPWM algorithm. Background technique [0002] Inverters include sine wave inverters and square wave inverters. The output of the sine wave inverter is the same or even better sine wave alternating current as the grid we use every day, because it does not have electromagnetic pollution in the grid. The output of the square wave inverter is a square wave alternating current with poor quality, and its positive maximum value and negative maximum value are generated almost at the same time, thus causing severe instability to the load and the inverter itself. At the same time, its load capacity is poor, only 40-60% of the rated load, and it cannot carry inductive loads. If the load is too large, the third harmonic component contained in the square wave current will increase the capacitive current flowing into the load, and in severe cases,...

AI Technical Summary

Problems solved by technology

The unbalanced capacitor voltage will increase the harmonic content of the output voltage waveform, and at the same time increase the voltage stress of the switching device, and even damage the switching device and break down the DC side capacitor

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