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Microgrid system and hierarchical control system thereof

A layered control system, micro-grid technology, applied in the direction of system integration technology, information technology support system, electrical components, etc., can solve the problem of low power quality and achieve the effect of improving power quality

Active Publication Date: 2018-11-06
HEFEI SUNGROW RENEWABLE ENERGY SCI & TECH CO LTD
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  • Abstract
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Problems solved by technology

[0005] The invention provides a microgrid system and its layered control system to solve the problem of low power quality in the prior art

Method used

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  • Microgrid system and hierarchical control system thereof
  • Microgrid system and hierarchical control system thereof
  • Microgrid system and hierarchical control system thereof

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Embodiment Construction

[0052] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

[0053] The invention provides a layered control system of a micro-grid system to solve the problem of low power quality in the prior art.

[0054] see figure 1 , the microgrid system includes multiple sub-microgrids, and each sub-microgrid passes through the corresponding sub-microgrid grid-connection point (such as figure 1 PCCA, PCCB and PCCC shown in ) are connected to the power grid or corresponding transformers; each sub-microgrid includes: distributed micro-sources (photovoltaic modu...

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Abstract

A microgrid system and a hierarchical control system thereof are provided, at the primary droop control base on a droop control theory, as the distribution of the output power of the corresponding distributed micro-source energy conversion device is realized, the frequency and amplitude fluctuations of the output voltage of the corresponding distributed micro-source energy conversion device introduced by the droop control are compensated by a secondary micro-source controller, and then the bus voltage of the corresponding sub-micro-grid connection point is regulated and controlled by a three-stage coordination controller through a PI closed-loop feedback control according to the voltage of the main grid connection point; furthermore, the voltage amplitude and frequency fluctuation caused by droop control are repaired, and the power quality of microgrid is improved.

Description

technical field [0001] The invention relates to the technical field of micro-grid control, in particular to a micro-grid system and a layered control system thereof. Background technique [0002] At present, there are mainly constant voltage and constant frequency mode (V / F mode), constant power mode (P / Q mode) and droop control mode for micro-source control in microgrid. [0003] Among them, when the micro-grid is in the island operation state, the micro-source maintains the voltage and frequency of the micro-grid system at constant voltage and constant frequency through constant voltage and constant frequency mode control; when the micro-grid is in the grid-connected operation mode, the system voltage depends on large The main grid support is controlled by the constant power mode to make the micro-sources output at a constant power; the droop control mode is to change the active and reactive output changes of the micro-sources by adjusting the voltage amplitude and frequen...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J13/00
CPCH02J3/381H02J13/00019Y02E40/70Y04S10/12
Inventor 葛木明陈亚东邹绍琨胡兵
Owner HEFEI SUNGROW RENEWABLE ENERGY SCI & TECH CO LTD
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