AC-DC hybrid micro grid bidirectional power converter virtual synchronization motor control method

A technology of virtual synchronous motor and power converter, applied in AC network circuits, reducing/preventing power oscillation, circuit devices, etc., can solve the problems of small inertia, low damping, and current-type control without frequency regulation and voltage regulation capabilities.

Active Publication Date: 2018-11-16
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of small inertia, low damping and single source of inertia in drooping control of AC/DC hybrid micro-grid, current-type control does not have frequency modulation and voltage regulatio...

Method used

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  • AC-DC hybrid micro grid bidirectional power converter virtual synchronization motor control method
  • AC-DC hybrid micro grid bidirectional power converter virtual synchronization motor control method
  • AC-DC hybrid micro grid bidirectional power converter virtual synchronization motor control method

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Embodiment Construction

[0059] The present invention will be further described below in conjunction with specific examples.

[0060] This embodiment is mainly used for bidirectional power converters in AC-DC hybrid microgrids, such as figure 1 As shown, in the AC-DC hybrid microgrid, the AC subnet and the DC subnet are connected through one or more bidirectional power converters, and the AC subnet is connected to the large power grid through a circuit breaker at the common connection point. device is disconnected. In the AC and DC sub-networks, different types of distributed power sources, energy storage devices and local loads are connected to the AC bus and DC bus respectively through corresponding power electronic converters.

[0061] A virtual synchronous motor control method for a bidirectional power converter of an AC / DC hybrid microgrid, including a bidirectional power converter, the structure of which is as follows figure 2 As shown, it is a three-phase voltage source PWM converter compose...

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Abstract

The invention discloses an AC-DC hybrid micro grid bidirectional power converter virtual synchronization motor control method, and relates to the AC-DC hybrid micro grid virtual synchronization motorcontrol field; the bidirectional power converter is a three-phase voltage source type PWM converter formed by IGBT switch tubes; the AC side is connected to a AC bus via a LC filter and a line impedance Z ac; the DC side is connected to a DC bus via a DC capacitor Cdc and an line impedance Zdc; the energy bidirectional transmission can be realized respectively via a frequency control unit, a virtual excitation control unit and a bidirectional power transmission control unit; the AC frequency and DC voltage can be directly controlled so as to keep AC-DC subnet load balancing; throughput characteristics of various types of power supplies and loads of the AC-DC subnet can be fully utilized so as to provide inertia for the AC frequency and DC voltage, thus enabling the bidirectional power converter to present sagging characteristics under a stable state, and building a bidirectional power converter closed loop system small signal model so as to provide a key parameter design method.

Description

technical field [0001] The invention relates to the field of virtual synchronous motor control of AC / DC hybrid microgrid, in particular to a virtual synchronous motor control method for AC / DC hybrid microgrid bidirectional power converter, which is suitable for balancing the load of AC / DC hybrid microgrid, so that the bidirectional power converter exhibits Similar to the dynamic frequency regulation characteristics of synchronous motors. Background technique [0002] The increase in the penetration rate of distributed power sources poses new challenges to the operation and control of the power system. The micro-grid technology that integrates multiple renewable energy sources, energy storage, and loads can be used as a self-operation and self-management unit of the power system. The advantages of effectively avoiding the uncertainty of distributed new energy output and the impact of load randomness on the power system will become an important part of the future smart grid. ...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/48H02J3/50H02J3/24
CPCH02J3/24H02J3/38H02J3/48H02J3/50H02J2203/20
Inventor 秦文萍李峰韩肖清王鹏贾燕冰孟润泉任春光王祺周一雄刘龙峰
Owner TAIYUAN UNIV OF TECH
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