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Three-port energy control device based on MMC structure

An energy control, three-port technology, used in circuit devices, harmonic reduction devices, AC network circuits, etc., can solve problems such as poor controllability and long recovery time for AC distribution network faults, to improve reliability and ensure normal operation. running effect

Active Publication Date: 2020-02-18
GUANGDONG POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are many problems in the operation of the AC distribution network, such as long fault recovery time and poor controllability, etc., while the DC distribution network has been greatly improved in terms of controllability and debugging, and can realize the complete integration of active and reactive power. Decoupling control, especially in improving power flow optimization and fast power support between multi-terminal feeders in distribution network, has natural advantages

Method used

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  • Three-port energy control device based on MMC structure
  • Three-port energy control device based on MMC structure
  • Three-port energy control device based on MMC structure

Examples

Experimental program
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Embodiment 1

[0032] Such as figure 1 The shown three-port energy control device based on the MMC structure, figure 1 Represents the structural principle block diagram of the three-port energy control device based on the MMC structure, see figure 1 , the three-port energy control device includes: a coordination controller, a three-port MMC converter, a control protection unit, an AC feeder and a DC bus, and the AC feeder includes the first AC feeder, the second AC feeder and the third AC feeder; the three-port MMC The converter includes a first-port MMC converter, a second-port MMC converter, and a third-port MMC converter; the control and protection unit includes a first control and protection unit, a second control and protection unit, and a third control and protection unit; The coordinating controller communicates with one end of the first control and protection unit, one end of the second control and protection unit and one end of the third control and protection unit, and each of the...

Embodiment 2

[0039] The three-port MMC converter is connected on the DC bus side through a positive DC switch and a negative DC switch. When a short-circuit fault occurs on the DC bus, the control and protection unit adopts fault blocking to isolate the fault through the positive DC switch and the negative DC switch, and the fault is blocked. After isolation, the rest of the non-fault ends can continue to operate normally, that is, the control and protection unit can detect and locate the fault point of the DC bus, and the MMC converter with a mixed structure of the full-bridge module and the half-bridge module can self-block the fault current , After the fault point is isolated by the DC switch, the three-port energy control device will automatically restart, and the non-fault end can operate normally, improving the reliability of power supply.

[0040] The working modes of each port of the three-port energy control device include power control mode, DC voltage control mode, V / F control mo...

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Abstract

The invention discloses a three-port energy control device based on a MMC structure, comprising: a coordinate controller, a three-port MMC converter, a control protection unit, an AC feeder line, anda DC bus. The coordinate controller is communicatively connected to one end of the control protection unit. The other end of the control protection unit is communicatively connected to the three-portMMC converter. One end of the three-port MMC converter is electrically connected to the AC feeder line, and the other end of the three-port MMC converter is electrically connected to the DC bus. The three-port energy control device, in view of the application trend of a future DC distribution network, improves the power flow controllability of an AC / DC hybrid distribution network, can realize apower quality management function, improves the power supply reliability of the distribution network and the scalability of a DC interface load.

Description

technical field [0001] The invention relates to the technical field of power electronic control, and more particularly, to a three-terminal energy control device based on an MMC structure. Background technique [0002] In recent years, with the advancement of power electronics technology, and based on the development of flexible DC converter valves and their control technology, people have also begun to explore the possibility of DC application in distribution networks. The application of DC distribution networks has been widely recognized at home and abroad. focus on. [0003] At present, there are many problems in the operation of the AC distribution network, such as long fault recovery time and poor controllability, etc., while the DC distribution network has been greatly improved in terms of controllability and debugging, and can realize the complete integration of active and reactive power. Decoupling control, especially in improving the power flow optimization and fas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/46H02J3/18H02J3/01
CPCH02J3/01H02J3/1842H02J3/36H02J3/46Y02E40/30Y02E40/40Y02E60/60
Inventor 欧繁王俊丰彭涛戚建平曾永浩孔令生范心明彭元泉董镝宋安琪李新邱太洪黄伟叶家雄杨启明潘志图王皆庆康成
Owner GUANGDONG POWER GRID CO LTD
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