Direct-current micro-grid communication-free current sharing method based on virtual generator

A technology of DC microgrid and virtual generator, which is applied in parallel operation of DC power supply, DC network circuit device, DC power input conversion to DC power output, etc. System stability and other issues, to achieve the effect of simple structure, accurate distribution, and high economy

Active Publication Date: 2021-07-30
DALIAN MARITIME UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, only the stability of the cascaded system is considered, and the stability control and current distribution of the parallel system are not studied.

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  • Direct-current micro-grid communication-free current sharing method based on virtual generator
  • Direct-current micro-grid communication-free current sharing method based on virtual generator
  • Direct-current micro-grid communication-free current sharing method based on virtual generator

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Embodiment Construction

[0032] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordina...

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Abstract

The invention provides a direct-current micro-grid communication-free current sharing method based on a virtual generator, which is applied to a virtual direct-current generator structure, the virtual direct-current generator structure comprises a plurality of power supplies arranged in parallel, and any power supply is connected to a direct-current bus through a bidirectional DC / DC converter. A line impedor is arranged between the DC / DC converter and the DC bus; the method comprises the steps that armature electromotive force in virtual direct-current generator structure control is fed forward to a voltage control link to enable the armature electromotive force to be kept at a constant value in a steady state, so that the droop effect of virtual impedance is recovered, and current adjustment is achieved. According to the method, the accurate distribution of the load current can be realized while the operation stability of the system is improved, and communication between the converters is not needed during adaptive adjustment of the virtual impedance in the method.

Description

technical field [0001] The present invention relates to the technical field of DC micro-grid operation control, in particular to a method for current sharing of DC micro-grid without communication based on a virtual generator. Background technique [0002] Compared with AC microgrids, DC microgrids are more suitable for flexible access to various distributed energy sources, can reduce losses and costs, improve power generation and distribution efficiency, and have no frequency and phase problems. Its development has received extensive attention. In a DC microgrid, most distributed generation units are connected to a common bus through power electronic converters. How to achieve accurate current sharing between converters while ensuring the stability of the bus voltage is a key issue in DC microgrids. [0003] Droop control is currently the most widely studied current sharing control strategy, which adjusts the current distribution by introducing a virtual impedance. As a t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/10H02J1/12H02M3/158
CPCH02J1/102H02J1/12H02M3/158
Inventor 张勤进张瀚文刘彦呈胡王宝王洪来于春来郭昊昊吕旭
Owner DALIAN MARITIME UNIVERSITY
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