Harmonic characteristic analytical method of MMC (Modular Multilevel Converter)
An analytical method and technology of harmonic characteristics, applied in the field of harmonic characteristics analysis of MMC, can solve problems such as calculation accuracy influence and error
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[0065] 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.
[0066] figure 1 (a) is a schematic diagram of a modular multilevel converter type DC transmission single-phase topology, the bridge arm of the converter adopts figure 1 (b) The half-bridge sub-modules (submodule, SM) shown in (b) are cascaded. Each bridge arm is composed of N sub-modules and a series reactor L.
[0067] In order to simplify the analysis and facilitate understanding, the theoretical derivation of this embodiment is based on the following assumptions
[0068] 1) MMC adopts real-time trigger mode. Real-time triggering can be regarded as a trigger method to control the infinite frequency;
[0069] 2) All submodules are identical;
[0070] 3) Before the MMC is officially put into operation, the pre-charge voltage of the sub-module is V d...
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