Hierarchical control-based alternating current direct current hybrid microgrid parallel converter ring current suppression method

An AC/DC hybrid and layered control technology, applied in the direction of reversible conversion equipment, electrical components, etc., can solve the problems of switch asynchrony, device parameter differences, etc., and achieve the effect of suppressing the circulation

Active Publication Date: 2018-08-24
TAIYUAN UNIV OF TECH +1
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  • Abstract
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  • Claims
  • Application Information

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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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  • Hierarchical control-based alternating current direct current hybrid microgrid parallel converter ring current suppression method
  • Hierarchical control-based alternating current direct current hybrid microgrid parallel converter ring current suppression method

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Embodiment Construction

[0019] Specific implementation plan

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

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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 circulating current of parallel two-way power converters in an AC / DC hybrid microgrid, which can effectively control the circulating current problem when the two-way power converters are operated in parallel, and is specifically a parallel switching of an AC / DC hybrid microgrid based on hierarchical control Suppression method for circulating current of flow device Background technique [0002] Considering the requirements of microgrid stability and capacity, multiple two-way power converters are often required to operate in parallel. At this time, it is necessary to analyze the current sharing problem in multiple parallel connections. Unlike the parallel operation of multiple inverters, two-way power converters need to be operated in parallel. The direct parallel mode using the common DC bus will provide a path for the zero-sequence circulating current. The circulating current between parallel modules wi...

Claims

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Application Information

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Patent Type & Authority Applications(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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