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A topology DC power flow controller based on mmc converter station

A technology of power flow controller and DC power flow, applied in the electric power field, can solve the problems of complex structure, inappropriate cost and control efficiency, etc., and achieve the effect of reducing cost and reducing design cost.

Active Publication Date: 2022-07-29
LIYANG RES INST OF SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The expansion of this scheme to a multi-port DC power flow controller requires multiple DC-DC converters composed of double-ended MMCs and transformers, and the structure is relatively complex. The above improvements to the DC power flow controller technology are not suitable in terms of cost and control efficiency.

Method used

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  • A topology DC power flow controller based on mmc converter station
  • A topology DC power flow controller based on mmc converter station
  • A topology DC power flow controller based on mmc converter station

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Embodiment Construction

[0022] The circuit schematic diagram of a topology DC power flow controller based on MMC converter station proposed by the present invention is as follows: figure 1 As shown, it includes MMC converter station and topological DC power flow controller. The MMC converter station performs voltage output through the upper arm circuit and the lower arm circuit. The topological DC power flow controller includes a symmetrical upper arm power flow controller. and the power flow controller of the lower arm; the MMC converter station adopts conventional three-phase power supply, and the voltage output of each phase is filtered by the three-phase filter inductance and then connected to the corresponding arm inductance of the upper arm circuit and the lower arm circuit. In the bridge arm inductance, the upper bridge arm and the lower bridge arm are in an up-down symmetrical structure, and an equal number of three-phase multi-stage switch circuit sub-module groups are set inside, and each ph...

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Abstract

The invention discloses a topological DC power flow controller based on an MMC converter station, belonging to the field of electric power technology. Each single-port output terminal of the power flow controller is connected to a DC positive pole, and each single-port output terminal of the lower arm power flow controller is connected to a DC negative pole; the single-port power flow controller includes a three-phase multi-stage full-bridge circuit sub-module group, each The one-phase full-bridge circuit sub-module group is connected in series with the filter inductor, and the in-phase bridge arm of the topological DC power flow controller is directly connected with the in-phase bridge arm of the MMC converter station. The topology of the invention is simple, no additional transformers or passive devices are required, and the bidirectional control of the DC power flow is realized.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a topological DC power flow controller based on a modular multi-level converter MMC converter station. Background technique [0002] The future development trend of flexible DC transmission system is multi-terminal networking. Multi-terminal flexible DC transmission system contains multiple converter stations, which can realize multi-source power supply and multi-drop power reception. In a two-terminal DC transmission system, one end controls the DC voltage and the other end controls the power, so the power flow of the DC line is completely controllable. However, for the multi-terminal DC transmission system, the internal line power flow cannot be independently controlled due to insufficient control margin. In order to avoid the overload situation of the transmission line and ensure the safe operation of the system, it is necessary to introduce a DC power flow controller ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02J1/10H02M7/797
CPCH02J3/36H02J1/10H02J1/106H02M7/797
Inventor 章飞张远实
Owner LIYANG RES INST OF SOUTHEAST UNIV
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