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Steady-state energy-supplementation control strategy of hybrid high voltage DC circuit breaker

A high-voltage DC, control strategy technology, applied in emergency protection circuit devices, emergency power protection, electrical components, etc., can solve problems such as limiting the application of DC circuit breakers, achieve simple and easy control strategies, prevent power supply reliability, and avoid insulation. and the effect of pressure resistance

Active Publication Date: 2017-12-08
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above circuit breakers all use external power supply to supply energy to the IGBT drive circuit in the circuit breaker, but since the circuit breaker needs to be connected in series in the DC line, and the DC voltage level is high, the insulation and withstand voltage of the external power supply circuit Capability puts forward higher requirements, this defect greatly limits the application of DC circuit breakers in the field of high voltage technology

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  • Steady-state energy-supplementation control strategy of hybrid high voltage DC circuit breaker

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Embodiment Construction

[0031] In order to describe the present invention in more detail, the technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] The research object of the present invention is figure 1 The hybrid high-voltage DC circuit breaker shown is composed of a daily flow-through branch and a fault cut-off branch; among them, the daily flow-through branch includes an ultra-fast mechanical switch and a load transfer switch; the fault cut-off branch is a main circuit breaker. The circuit breaker and the arrester are connected in parallel. Both the load transfer switch and the main circuit breaker in the hybrid high-voltage DC circuit breaker are composed of several improved full bridge sub-modules (IFBSM) in series.

[0033] The IFBSM used in the present invention is composed of 2 IGBTs, 4 diodes and 1 sub-module capacitor. The improved full-bridge sub-module mainly includes two switch states, n...

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Abstract

The invention discloses a steady-state energy-supplementation control strategy of hybrid high voltage DC circuit breaker. According to the invention, through a reasonable switch action time sequence, capacitor voltage of an improved full-bridge sub module can be made to fluctuate within a manually set threshold value range, so that energy stability is ensured and influence on power supply reliability of a drive circuit of the full-bridge sub module due to violent fluctuation of the capacitor voltage is prevented. Besides, since a load transfer switch and a main circuit breaker get energy through capacitors of sub modules of themselves respectively, external power supply is not needed, so that problems of insulation of voltage resistance in projects are avoided; design, manufacture and construction difficulties are reduced; and application of the circuit breaker typology in a high voltage DC power grid is facilitated.

Description

Technical field [0001] The invention belongs to the technical field of power electronic systems, and specifically relates to a steady-state energy compensation control strategy for a hybrid high-voltage DC circuit breaker. Background technique [0002] In order to solve the problem of cross-regional, large-scale power transmission and improve the capacity of distributed new energy, the flexible DC grid technology based on modular multi-level converters is gradually becoming one of the important directions for the future development of my country's power grid. Compared with AC transmission and traditional DC transmission technology, flexible DC transmission has the advantages of decoupling control of active power and reactive power, no reactive power compensation device, small footprint, and good output voltage waveform quality. However, although it has significant advantages in steady-state operation, there are still major technical difficulties in DC fault protection and process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H1/06
CPCH02H1/06H02H7/268
Inventor 徐政肖晃庆徐雨哲王世佳
Owner ZHEJIANG UNIV
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