Rapid voltage-sharing method of cascaded multilevel converter
A technology of cascading multi-level and converters, which is applied in the direction of electrical components and output power conversion devices, can solve the problems of large switching loss of sub-modules, high switching frequency of carrier stacked modulation strategy, and high harmonic content of output current. Achieve the effects of avoiding high harmonic content of output current, fast equalization of bridge arm capacitor voltage, and high equivalent switching frequency
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[0025] The technical solutions provided by the present invention will be described in detail below with reference to the drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and not to limit the scope of the present invention.
[0026] The method of the invention discloses a fast voltage equalization method for cascaded multilevel converters, which defines the reference voltage modulation wave signal of a certain phase bridge arm as U ref . It includes the following steps:
[0027] Step (1): Bridge arm reference voltage modulation wave signal U ref versus N After comparing two phase-shifted triangular carriers, the drive signals of all switching devices in each sub-module are obtained G j1 , G j2 , G j3 ,… G jM ,among them, M Is the number of switching devices in each sub-module, j =1,2... N , N The value of is obtained based on the AC side voltage amplitude, the sub-module capacitor vol...
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