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AC-DC hybrid microgrid droop coefficient selection method based on power flow feasible region

An AC-DC hybrid, feasible technology, applied in the same frequency AC network with different sources, single-net parallel feeding arrangement, electrical components, etc., can solve the problems that have not yet collected data, found no instructions or reports, etc.

Pending Publication Date: 2020-06-30
SHANGHAI JIAO TONG UNIV +3
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Problems solved by technology

[0009] At present, there is no description or report of the similar technology of the present invention, and no similar data at home and abroad have been collected yet.

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  • AC-DC hybrid microgrid droop coefficient selection method based on power flow feasible region
  • AC-DC hybrid microgrid droop coefficient selection method based on power flow feasible region
  • AC-DC hybrid microgrid droop coefficient selection method based on power flow feasible region

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Embodiment Construction

[0131] The following is a detailed description of the embodiments of the present invention: this embodiment is implemented on the premise of the technical solution of the present invention, and provides detailed implementation methods and specific operation processes. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

[0132] The embodiment of the present invention provides a method for selecting the droop coefficient of the AC / DC hybrid microgrid based on the feasible region of the power flow, which includes the following steps:

[0133] S1. Establish a unified power flow calculation model for AC and DC hybrid microgrids;

[0134] S2, on the basis of the unified power flow calculation model of the AC-DC hybrid microgrid established in S1, calculate the feasible region of the power flow including the ...

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Abstract

The invention provides an AC / DC hybrid microgrid droop coefficient selection method based on a power flow feasible region. The method comprises the steps of S1, establishing an AC / DC hybrid microgridunified power flow calculation model; s2, on the basis of the AC-DC hybrid microgrid unified power flow calculation model established in the S1, calculating a power flow feasible region containing a droop coefficient; s3, based on the power flow feasible region obtained in S2, establishing a boundary convex-concave characteristic equation of the power flow feasible region, and obtaining a power flow feasible region approximate boundary containing a droop coefficient; and S4, based on the approximate boundary of the power flow feasible region obtained in the S3, selecting a droop coefficient enabling the AC-DC hybrid microgrid to operate stably. Meanwhile, the invention provides a terminal for executing the method. According to the method, the speed of solving the voltage stability criticalpoint is greatly improved, and the calculation efficiency is high; by deriving a boundary convex-concave characteristic equation of a high-dimensional power flow feasible region, the value range accuracy of the droop coefficient is improved; and a reference is provided for stable operation of the AC-DC hybrid microgrid.

Description

technical field [0001] The invention relates to the technical field of AC / DC hybrid microgrids, in particular to a method for selecting droop coefficients of AC / DC hybrid microgrids based on the feasible region of power flow. Background technique [0002] The distributed generators (Distributed Generators, DG) and loads in the microgrid are various. Because the AC-DC hybrid microgrid has the advantages of both the AC microgrid and the DC microgrid, the operation stability can be improved by optimizing the inverter control parameters. , with broad prospects for development. [0003] The energy storage and distributed energy in the AC / DC hybrid microgrid are connected through the inverter interface. The droop control method simulates a frequency modulation control, which can realize power distribution in proportion to the droop coefficient, and stabilize the system voltage and frequency without communication. It has better redundancy and scalability, so it is widely used in t...

Claims

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Application Information

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IPC IPC(8): H02J3/06H02J5/00H02J3/38
CPCH02J3/06H02J5/00H02J3/38
Inventor 庞磊韩蓓李国杰汪可友于德明刘海军杨士慧莫小林刘庆时李子衿
Owner SHANGHAI JIAO TONG UNIV
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