Bi-directional power converter control method based on virtual synchronous motor

A virtual synchronous motor and power converter technology, which is applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc., can solve the lack of rotational inertia of AC-DC hybrid microgrid and the penetration rate of renewable energy Improve, low frequency stability and other problems, to achieve the effect of improving dynamic response characteristics, improving inertia, and improving stability

Active Publication Date: 2018-03-30
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] In order to solve the problems of the lack of moment of inertia of the AC-DC hybrid micro-grid, the rapid response of the power electronic converter, the low frequency stability, the limitation of the increase of the penetrati

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  • Bi-directional power converter control method based on virtual synchronous motor
  • Bi-directional power converter control method based on virtual synchronous motor
  • Bi-directional power converter control method based on virtual synchronous motor

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Example Embodiment

[0045] The specific embodiments of the present invention will be described below in conjunction with the drawings.

[0046] This embodiment is mainly used for a bidirectional power converter in an AC / DC hybrid microgrid, such as figure 1 As shown, the AC / DC hybrid microgrid is composed of AC microgrid and DC microgrid. The AC microgrid contains AC distributed power sources and loads, and the DC microgrid contains DC distributed power sources and loads. The AC bus of the power grid is connected to the DC bus of the DC microgrid through a bidirectional power converter, and the AC microgrid is connected to the public grid through a transformer.

[0047] A control method of two-way power converter based on virtual synchronous motor. figure 2 As shown, the bidirectional power converter includes a three-phase three-leg structure composed of switch tubes, a DC side capacitor and an AC side filter inductor, so that the AC side output voltage of the bidirectional power converter is equival...

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Abstract

The invention discloses a bi-directional power converter control method based on a virtual synchronous motor, and relates to the field of bi-directional power control in alternating-current and direct-current mixed micro-grids. A bi-directional power converter is of a three-phase three-leg structure formed by a switch tube and provided with a direct-current-side capacitor and an alternating-current-side filter inductor, alternating-current-side output voltage of the bi-directional power converter is equivalent to exciting electromotive force of the synchronous motor, alternating-current-side grid voltage is equivalent to terminal voltage of the synchronous motor, filter inductance is equivalent to armature winding of the synchronous motor, the bi-directional power converter can serve as the virtual synchronous motor after equivalence is achieved, an inertia simulation unit of the bi-directional power converter is provided with the direct-current-side capacitor, bi-directional transmission of energy is achieved by the aid of a virtual frequency controller, a virtual excitation regulator and a virtual motor control unit, direct-current voltage variation and alternating-current frequency fluctuation are decreased, the bi-directional power converter has a certain inertia, dynamic response of a system is improved, and the stability of the system is improved.

Description

technical field [0001] The invention relates to the field of bidirectional control of an AC-DC hybrid microgrid, in particular to a bidirectional power converter control method based on a virtual synchronous motor, which is suitable for realizing bidirectional flow of energy between AC and DC microgrids. Background technique [0002] With the increase in the penetration rate of distributed power generation, microgrid, a technology that combines the advantages of different energy sources and has good controllability, is becoming more and more mature. Microgrids can be divided into AC microgrids, DC microgrids and AC / DC hybrid microgrids according to the nature of source-load. The AC-DC hybrid microgrid can connect the AC and DC microgrids in the same network in an orderly and independent manner, simplify the structure of the microgrid, save power conversion devices, reduce system losses, make the control more flexible, and improve the economy of the entire system and reliabi...

Claims

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Application Information

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IPC IPC(8): H02J5/00H02M7/797
CPCH02J5/00H02M7/797
Inventor 秦文萍李峰韩肖清王鹏王英贾燕冰孟润泉任春光王祺刘颖
Owner TAIYUAN UNIV OF TECH
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