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Microgrid operation control method

A technology for operation control and micro-grid, which is applied in the parallel feeding arrangement of single network, integration of power network operating system, electrical components, etc. It is easy to fail and other problems, and achieves the effect of frequency and voltage stability, high frequency control accuracy, and improved reliability.

Active Publication Date: 2020-11-24
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology

However, master-slave control needs to select one or more micro power sources as the main control unit, and provide voltage and frequency support to the micro grid system when the micro grid changes from grid-connected mode to island mode. The problem of strong dependence and easy failure of mode switching; in the peer-to-peer control method, all micro power sources are in the same position and do not depend on a certain main control unit and communication lines. This method is conducive to the plug and play of micro power sources and the The expansion of the power grid system does not take into account the restoration of frequency and voltage, which is differential frequency regulation

Method used

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Embodiment Construction

[0043] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with specific implementations and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the application. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present application.

[0044] figure 1 It is a flow chart of the microgrid operation control method of this application, image 3 It is a schematic diagram of the frequency grading response. It should be explained that the frequency grading response is that the microgrid controller performs power adjustment and load grading removal according to the different frequency adjustment thresholds set, so as to ensure that the frequency of the mi...

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Abstract

The invention discloses a microgrid operation control method. The method comprises the following steps: a microgrid comprises small hydro, wind, light, storage and other forms of distributed power supplies, when a main grid system fails, a microgrid control system disconnects a grid-connected switch, isolates a fault point and switches to an island mode for operation; in the island mode, a hydroelectric generating set is used as a main frequency modulation and voltage regulation power supply in the microgrid to support the frequency and voltage of the microgrid, and each distributed power supply quickly participates in frequency primary regulation to cooperatively support the frequency and voltage stability of the microgrid; a microgrid energy management system recovers frequency and voltage to a normal range through load hierarchical control and energy storage accurate output adjustment. According to the invention, the multi-source coordination control problem of the microgrid systemcontaining the small hydro in the island mode is solved, the frequency modulation and voltage regulation capabilities of the traditional hydropower unit are fully excavated, and the frequency and voltage stability of the microgrid is ensured. The method is especially suitable for power supply scenes of remote areas with rich water and electricity resources, and the load power supply reliability level can be remarkably improved.

Description

technical field [0001] The present application relates to the technical field of micro-grid operation control, in particular to a micro-grid operation control method. Background technique [0002] With the increasing proportion of distributed power generation, microgrid has received extensive attention. Microgrid refers to a small power generation system composed of distributed power sources, energy storage equipment, energy conversion devices, related loads and monitoring and protection devices, enabling an autonomous system that can realize self-control, protection and management, in which energy storage equipment It includes a plurality of energy storage units, and each energy storage unit includes an energy storage element and a PCS (that is, an energy storage DC / DC converter). [0003] The microgrid has two operating modes: grid-connected and islanded. The island mode means that the microgrid does not operate in parallel with the large power grid. Provide power; if th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/14H02J3/24H02H7/26H02J3/38H02J3/48H02J3/50
CPCH02J3/14H02J3/241H02H7/26H02J3/388H02J3/48H02J3/50Y02B70/3225Y04S20/222
Inventor 杨金东周伟张贵鹏王科吴万军伍绍鹏黄一腾
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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