Common-mode-injection-based nearest level modulation method for MMC
A technology of recent level approximation and modulation method, applied in the direction of irreversible AC power input conversion to DC power output, etc., can solve problems such as high cost and difficulty, achieve reasonable total loss, total loss optimization, and reduce conduction loss. Effect
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[0032] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0033] Such as figure 1 As shown, the basic unit of a single-ended three-phase modular multilevel converter (MMC) is a sub-module (Sub-Module, SM). N sub-modules are cascaded and a bridge arm inductor is connected in series to form a bridge arm. The bridge arms are connected in series to form a phase unit. The three-phase MMC converter contains three phase units, six bridge arms, and 6N sub-modules. DC side bus voltage is U dc , the three-phase phase voltages on the AC side are respectively u a , u b and u c . Point O is the zero potential reference point.
[0034] The modulation method of the MMC converter is derived from the PWM modulation method of the multi-level converter. MMC also has the characteristics of a large number of levels. In actual...
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