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Equivalent circuit of a bridge arm of a modular multilevel converter with full bridge structure

A modular multi-level, full-bridge structure technology, applied in the field of effective circuits, can solve the problems of increasing complexity and failure to simulate bridge arm faults

Active Publication Date: 2017-10-20
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

Patent CN103593521A proposes that in the blocking stage of the full-bridge modular multilevel converter, an additional switching device is processed for the problem that the conduction state of the switching device changes between two simulation times. The switching between the controlled state and the non-controlled state increases the complexity, and it is impossible to simulate the working condition that a few modules in the bridge arm fail

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  • Equivalent circuit of a bridge arm of a modular multilevel converter with full bridge structure
  • Equivalent circuit of a bridge arm of a modular multilevel converter with full bridge structure
  • Equivalent circuit of a bridge arm of a modular multilevel converter with full bridge structure

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Embodiment Construction

[0032]The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0033] figure 1 Shown is the structure of a full-bridge modular multilevel converter (Modular Multilevel Converter, MMC). Each phase of the AC side of the modular multilevel converter consists of upper and lower bridge arms, and each bridge arm is composed of several full-bridge power modules and reactors connected in series. For example the AU bridge arm includes a reactor X AU and N power modules AU connected in series 1 -AU N , N≥1.

[0034] figure 2 Shown is the internal circuit principle of the full bridge power module. Such as figure 2 As shown, the full-bridge power module includes energy storage capacitor C, four switching devices K 1 、K 2 、K 3 、K 4 , and four diodes D 1 、D 2 、D 3 、D 4 . Among them, the first switching device K 1 The collector and the third switching device K 3 The collector of the energy storage capa...

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Abstract

The invention discloses an equivalent circuit of a bridge arm of a modular multilevel converter with a full-bridge structure. The equivalent circuit of the bridge arm classifies the full-bridge power modules in the bridge arm into two types: a controlled module and an uncontrolled module. , all controlled modules in the bridge arm are equivalent to the second voltage source (S2), and all uncontrolled modules in the bridge arm are equivalent to four diodes (D1, D2, D3, D4) and the first voltage source (S1). The equivalent circuit of the bridge arm can simulate the electromagnetic transient process under the condition that the bridge arm contains both uncontrolled modules and controlled modules, so as to realize the full-bridge structure modular multilevel converter in the uncontrolled state and controlled state. state, fast simulation of a few block failure states.

Description

technical field [0001] The invention relates to a bridge arm equivalent circuit of a full bridge structure modular multilevel converter. Background technique [0002] The high-voltage flexible DC transmission system (VSC-HVDC) based on the Modular Multilevel Converter (MMC) has many advantages such as four-quadrant operation, small filter, and the ability to supply power to passive networks. received widespread attention. There are two types of existing modular multilevel converter circuit topologies: half-bridge structure and full-bridge structure. [0003] For a modular multilevel converter with a half-bridge structure, when a short-circuit fault occurs on the DC side, the AC power supply, the anti-parallel diode of the insulated gate bipolar thyristor (IGBT) and the DC short-circuit point will form a short-circuit loop, resulting in a modular multilevel converter. The level converter system is severely overcurrent. Since the current high-voltage DC circuit breaker tech...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 徐飞李耀华王平李子欣高范强
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI