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Circulation Suppression Method for Parallel Converters in Hybrid Microgrid Based on Hierarchical Control

A technology of layered control and circulating current suppression, applied in the direction of inverting conversion equipment, electrical components, etc., can solve the problems of asynchronous switching and device parameter differences, and achieve the effect of suppressing circulating current.

Active Publication Date: 2020-04-28
TAIYUAN UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the circulation problem of the AC / DC hybrid microgrid parallel converter due to switch asynchrony and device parameter differences, the present invention provides a hierarchical control-based method for suppressing the circulation of the AC / DC hybrid microgrid parallel converter

Method used

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  • Circulation Suppression Method for Parallel Converters in Hybrid Microgrid Based on Hierarchical Control
  • Circulation Suppression Method for Parallel Converters in Hybrid Microgrid Based on Hierarchical Control

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Embodiment Construction

[0019] specific implementation plan

[0020] The parallel main circuit of the converter includes a three-phase three-leg converter. The AC side of the three-phase three-leg converter is connected to the AC microgrid through the filter inductor, parasitic resistance and filter capacitor, and the DC side is connected to the DC through the DC capacitor. Microgrid. It also includes an AC voltage acquisition module for acquiring AC voltage measurement, an AC current acquisition module for acquiring AC measurement current, and a DC voltage acquisition module for acquiring DC bus voltage. The output end of the AC voltage acquisition module is connected to the input end of the positive sequence component extraction module, the PLL phase-locked loop module and the autonomous operation control module, the output end of the AC current acquisition module is connected to the input end of the coordinate transformation module, and the output end of the DC voltage acquisition module terminal...

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Abstract

The invention relates to an alternating current direct current hybrid microgrid parallel converter ring current suppression method. An alternating current direct current hybrid microgrid consists of an alternating current sub grid and a direct current sub grid, and the two sub grids are connected through a parallel bidirectional power converter. By adoption of the control method, power interactionof the alternating current sub grid and the direct current sub grid can be realized for mutual power support, and smooth switching of grid connection and island mode can be carried out; and the control links mainly comprise automatic operation control and ring current suppression control. The automatic operation control link is specific to different characteristics of alternating current direct current bus voltages, and performs normalization processing thereon according to the sub grid voltage allowable fluctuation range to realize power bidirectional smooth transmission between the alternating current sub grid and the direct current sub grid; the ring current suppression link adopts dq0 three-axis control to replace the conventional dq two-axis control, and proposes a positive sequencecomponent extraction-based ring current suppression method specific to the ring current problem caused by switch action desynchrony, device model difference and the like, so that ring current generation between the parallel bidirectional converters can be suppressed effectively.

Description

technical field [0001] The invention relates to a method for suppressing the circulation of parallel bidirectional power converters in an AC / DC hybrid microgrid, which can effectively control the circulation problem when the bidirectional power converters are running in parallel, specifically the AC / DC hybrid microgrid parallel switching method based on layered control. Circulator circulation suppression method. Background technique [0002] Considering the stability and capacity requirements of the microgrid, it is often necessary to run multiple bidirectional power converters in parallel. At this time, it is necessary to analyze the current sharing problem of multiple parallel connections. The direct parallel mode of the common DC bus will provide a path for the zero-sequence circulating current. The circulating current between the parallel modules will distort the grid-connected current, increase losses, increase the stress of power devices, and reduce the reliability and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J5/00H02M7/81
CPCH02J5/00H02M7/81
Inventor 张佰富韩肖清王金浩雷达常潇李慧勇张世峰
Owner TAIYUAN UNIV OF TECH
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