Double-carrier-wave modulation method of modular multilevel converter
A modular multi-level, dual-carrier modulation technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc. question
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[0026] see image 3 , is a flow chart of the dual-carrier modulation strategy and the capacitor-voltage balance control method, including the following steps:
[0027] 1) The number of sub-modules that need to be invested in the upper and lower arms of the three-phase a, b, and c phases is obtained through the dual-carrier modulation strategy. and (in the subscript p represents the upper bridge arm, n represents the lower bridge arm, j∈[a,b,c], and the superscript dcm represents dual-carrier modulation), and further obtains the change in the number of sub-modules that needs to be invested in the kth control cycle ;
[0028] 2) Detect the capacitor voltage and bridge arm current of each sub-module, and realize the capacitor voltage balance control according to the voltage balance control method.
[0029] and represent the reference voltages of the upper and lower arms of the j-phase, respectively. In order to facilitate the analysis of the harmonic characteristics of t...
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