Unified power flow controller in modular structure

A power flow controller and modular technology, which is applied in the direction of climate change adaptation, power transmission AC network, single-network parallel feeding arrangement, etc., can solve the problems of increased circuit complexity of clamped multi-level converters, etc. To achieve the effects of voltage equalization control, fast bypass capability, and reduced voltage change rate

Active Publication Date: 2013-08-07
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

The circuit complexity of clamped multi-level converters increases sharply with the increase of the number of levels. In actual large-capacity applications, it generally does not exceed three levels. The bottleneck of development is still the device series technology.

Method used

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  • Unified power flow controller in modular structure
  • Unified power flow controller in modular structure
  • Unified power flow controller in modular structure

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Embodiment Construction

[0041] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0042] The new unified power flow controller proposed in this embodiment adopts three single-phase bridge modular multilevel converters, its structure is as follows figure 1 As shown, including converter I (shown as 2 in the figure), converter II (shown as 9 in the figure), transformer I (shown as 5 in the figure) and transformer II (shown as 6 in the figure ); one end of the converter I is connected to the transformer I and then connected to the grid, and the other end is connected to the converter II through the positive and negative busbars; the other end of the converter II is connected to the grid through the transformer II; and the inverter of this embodiment The structures of converter I and converter II are three single-phase bridge modular converters, which are composed of 12 three-phase bridge arms, and the thr...

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Abstract

The invention relates to the technical field of power electronics and discloses a unified power flow controller in the modular structure. A structurally modified modular multilevel converter is organically combined with a unified power flow controller so that direct-current voltage of the unified power flow controller is halved and the unified power flow controller is imparted with individual phase control capacity; a power electronic bypass switch on the serial side of the unified power flow controller provides higher safety, and the requirement on converter switching devices is lower. In addition, the unified power flow controller has the advantages of compact structure of the modular multilevel converter, flexibility in voltage and power level change, low switch frequency, low loss, low content of output waveform harmonic and the like.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a unified power flow controller adopting a modular structure. Background technique [0002] The unified power flow controller (UPFC) is a series-parallel hybrid FACTS device based on voltage source converters, which can flexibly control multiple electrical parameters and is an effective means to improve the controllability of the power grid. Immediately after the concept of UPFC was put forward, there was an upsurge in research and application. Three foreign projects have been put into operation one after another, all of which continued the early flexible AC transmission system (FACTS) field commonly used to replace the three-phase square-wave voltage source with The multiple topology of phase-shifting superposition of the converter unit through the transformer, and the GTO device series connection and diode-clamped three-level converter technology are adopt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/38
CPCY02E60/60Y02A30/60
Inventor 荆平周飞邱宇峰宋洁莹
Owner STATE GRID CORP OF CHINA
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