Five-level clamping cross type sub-module topological structure of modular multi-level converter

A modular multi-level, topological structure technology, applied in power transmission AC network, AC power input conversion to DC power output, electrical components, etc. It solves the problems of heavy load on the device, and achieves the effect of safe and reliable operation of the topology, reducing hardware costs, and reducing the burden.

CN113300622APending Publication Date: 2021-08-24KUNMING UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2021-08-24

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Abstract

The invention relates to a five-level clamping cross type sub-module topological structure of a modular multilevel converter, and belongs to the technical field of flexible direct-current power transmission. The MMC sub-module topology comprises an MMC sub-module topology, the MMC sub-module topology comprises sub-module output ends, the sub-module output ends are a voltage anode output end and a voltage cathode output end, the MMC sub-module topology further comprises a left half-bridge and a right half-bridge which are the same in structure, and the two half-bridges are connected through a power switch group S7 and a power switch group S8 which are crossed. The method has the rapid DC fault clearing capability, an AC switch does not need to be tripped off, the problems of capacitor voltage divergence possibly caused by long-time locking and action of an AC circuit breaker are avoided, and the non-locking mode is beneficial to rapid recovery of stable operation after the MMC breaks down.
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Description

Technical field

[0001] The present invention relates to a modular multilevel converter five-level clamp cross-type sub-module topology, in particular to a modular multilevel converter (Modular Multilevel Converter, MMC) with DC fault clearing capability. The five-level clamped cross-type sub-module topology belongs to the field of flexible DC transmission technology. Background technique

[0002] The modular multi-level converter MMC type flexible DC grid based on overhead lines has the advantages of no commutation failure, small harmonic content and flexible controllability. It is expected to be used in new energy collection, distributed power supply access and cross-regional interconnection. play an important role. When a short-circuit fault occurs in the DC side line of the overhead line flexible DC grid, lower damping will cause the current to rise faster. Since the current does not cross zero, the fault clearing is more difficult than in the AC system. There are curre...

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Embodiment Construction

[0090] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0091] like figure 1 As shown, a five-level clamped cross-type sub-module topology structure of a modular multi-level converter with DC fault clearance capability includes an MMC sub-module topology, and the MMC sub-module topology includes a sub-module output end, so The output terminals are the voltage positive output terminal and the voltage negative output terminal, and the sub-module structure also includes two left and right half bridges with the same structure, and the two half bridges pass through the crossed power switch group S. 7 and S 8 connected, the switch group S 7 is composed of an insulated gate bipolar transistor T 7 and its anti-parallel diode D 7 Switches and Insulated Gate Bipolar Transistors T 9 and its anti-parallel diode D 9 The switches are set up in series; the switch group S 8 is composed of an insulated gate bip...