Modularized multi-lever converter with direct-current fault ride-through capacity
A modular multi-level, DC fault ride-through technology, applied in electrical components, power transmission AC networks, emergency protection circuit devices, etc., can solve problems such as device damage, DC side current increase, system danger, etc. Strong, the same effect, the effect of reducing the production cost
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[0026] Such as Figure 4 As shown, a modular multilevel converter with DC fault ride-through capability, the converter includes A-phase upper and lower bridge arms, B-phase upper and lower bridge arms, and C-phase upper and lower bridge arms; sub-modules are divided into two types: The first module and the second module.
[0027] Among them, the first module includes a DC capacitor C1, a semiconductor switch T1, a semiconductor switch T2, a freewheeling diode D1, and a freewheeling diode D2. A freewheeling diode D1 is connected in series between the emitter and collector of the semiconductor switch T1, and a freewheeling diode D2 is connected in series between the emitter and the collector of the semiconductor switch T2. The emitter of the semiconductor switch T1 and the collector of the semiconductor switch T2 are connected as the positive terminal A of the first module, the emitter of the semiconductor switch T2 serves as the negative terminal B of the first module, and the co...
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