The invention discloses a high-efficiency low-
ripple frequency conversion modulation method, and belongs to the technical field of
power transmission. An
inverter composed of two high-frequency switching devices and six low-frequency switching devices is driven, the generation mode and
time sequence of a zero vector in a traditional
space vector modulation strategy are improved, the high-frequencyswitching devices
control bus voltage to be zero to replace the
zero voltage vector, meanwhile
zero voltage switching conditions are provided for the low-frequency switching devices, the low-frequency switching device only generates an effective
voltage vector, the switching action frequency is reduced, and the loss of the
inverter is reduced by utilizing the low switching loss characteristic ofthe high-frequency switching device, so that the available
switching frequency of the
inverter is improved, the current
ripple is reduced, the carrier period is adjusted in real time according to thepredicted value and the given value of the current
ripple, the current ripple is reduced, and the
electromagnetic compatibility of the
system is improved, according to the modulation
algorithm provided by the invention, higher
system working efficiency, lower current ripple output and higher current control precision can be obtained at the same time, and the modulation
algorithm has a certain application value.