A simple start-up method for clamped twin-submodule modular multilevel converters
A modular multi-level, clamping twin module technology, applied to electrical components, output power conversion devices, etc., can solve problems such as module capacitor voltage overcharge
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[0032] The present invention will be described in further detail below with reference to the accompanying drawings.
[0033] Clamping two sub-module topologies such as figure 2 As shown, it consists of two half-bridge sub-module units connected via two clamping diodes and a bootstrap IGBT (To).
[0034] Each half-bridge sub-module unit has 3 switch states, input state (T11 on, T12 off; T21 on, T22 off), cut-out state* (T11 off, T12 on; T21 off, T22 on), blocking state ( Both tubes are off); the guide IGBT is divided into two states of on and off. The aforementioned "cut off" refers to controlling the output voltage of the sub-module or half-bridge sub-module unit to zero, that is, to achieve the effect that the module capacitor does not participate in charging; because when the IGBT is turned off, the bridge arm current is negative, and the half-bridge sub-module is negative. The module unit is in the cut-out state and cannot produce the cut-out effect, so the state where T...
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