A SPACE VECTOR BASED SYNCHRONOUS MODULATING METHOD AND SYSTEM

摘要

A space vector based synchronous modulating method includes sampling a frequency f of a reference voltage vector; checking a relational table of frequencies and carrier wave ratios by the frequency f so as to obtain a carrier wave ratio N; obtaining a passing angle ?? of the reference voltage vector by ??=2p/N; obtaining a modulating angle ?m of the reference voltage vector by ?m=(Nth-1)×??, in which Nth indicates which time of sampling; obtaining a modulating ratio m according to a modulating ratio-frequency curve; accounting and synthesizing an output angle of three basic voltage vectors of the reference voltage vector according to the modulating angle ?m and the passing angle ?? of the reference voltage vector and the modulating ratio m; comparing a variable quantity ?f of the reference voltage vector angle ? and the output angle of three basic voltage vectors, and outputting corresponding basic voltage vectors according to the comparing result; synthesizing an output voltage in accordance with the reference voltage vector by the basic voltage vectors.