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

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. ...

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

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