Synchronization modulation strategies based on space vector PWM

This paper first discusses the required space vector modulation synchronization symmetry (three-phase symmetrical, half-wave symmetry, quarter symmetry), and analysis the relationships between these symmetry and the inverter states. Then apply these inverter states to conventional synchronous SVPWM strategy and voltage clamping strategies. From summarizing these two strategies and comparing the number of output pulses, this paper assuming that the premise of maintaining the symmetry, the new strategy could be to send the required number of pulses. To derive asymmetric “zero state transformation” strategy. At last through simulation and harmonic analysis, the result analysis shows that voltage clamp vector strategy and the “zero state transformation” strategy can complementary the traditional SVPWM synchronization strategy, use of these three strategies we can send out any odd-pulse sequence; harmonic analysis showed that under the same conditions, the new modulation strategy has a lower harmonic content.