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Control method of virtual synchronous motor for AC/DC hybrid microgrid bidirectional power converter

A technology for virtual synchronous motors and power converters, applied to AC network circuits, reducing/preventing power oscillations, circuit devices, etc., can solve problems such as small inertia, low damping, and current-type control without frequency modulation and voltage regulation capabilities

Active Publication Date: 2021-03-02
TAIYUAN UNIV OF TECH
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  • 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 regulation capabilities, and cannot provide voltage and frequency support in isolated islands, the present invention provides a solution. A Virtual Synchronous Motor Control Method for AC-DC Hybrid Microgrid Bidirectional Power Converter

Method used

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  • Control method of virtual synchronous motor for AC/DC hybrid microgrid bidirectional power converter
  • Control method of virtual synchronous motor for AC/DC hybrid microgrid bidirectional power converter
  • Control method of virtual synchronous motor for AC/DC hybrid microgrid bidirectional power converter

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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 a virtual synchronous motor control method for a bidirectional power converter of an AC-DC hybrid micro-grid, and relates to the field of virtual synchronous motor control in an AC-DC hybrid micro-grid. The bidirectional power converter of the present invention is a three-phase voltage source PWM converter composed of IGBT switch tubes, and the AC side passes through LC Filter and Line Impedance Z ac Connected to the AC bus, the DC side passes through the DC capacitor C dc and line impedance Z dc Connected to the DC bus; through the frequency control unit, the virtual excitation control unit and the bidirectional power transmission control unit respectively, the two-way transmission of energy is realized. By directly controlling the AC frequency and DC voltage, the load balance of the AC and DC subnets is maintained, and the AC and DC subnets are fully utilized. , The throughput characteristics of various types of power sources and loads in the DC subnet provide inertia for the AC frequency and DC voltage, so that the bidirectional power converter exhibits a drooping characteristic in a steady state, and the key points are given by establishing a small signal model of the closed-loop system of the bidirectional power converter Parametric 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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Patent Type & Authority Patents(China)
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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