Layered coordinated voltage control method suitable for DC micro grid

A DC microgrid and coordinated control technology, applied in the direction of DC network circuit devices, electrical components, circuit devices, etc., can solve problems such as deviating from the rated value, unfavorable equipment normal operation, DC voltage deviation, and DC microgrid system operation impact, etc.

Inactive Publication Date: 2018-08-17
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Description
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Problems solved by technology

However, after the DC bus voltage reaches a steady state through mediation, excessive deviation from the rated value is not conducive to the normal operation of equipment with strict voltage requirements. Therefore, it is necessary to improve the existing control method to restore and maintain the voltage at the rated value
[0017] This control method does not require communication and has higher reliability. However, there is also the problem that after power adjustment, the DC voltage deviates and cannot be maintained at the rated value, which has a certain impact on the operation of each end of the DC microgrid system.

Method used

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  • Layered coordinated voltage control method suitable for DC micro grid
  • Layered coordinated voltage control method suitable for DC micro grid
  • Layered coordinated voltage control method suitable for DC micro grid

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Embodiment 1

[0038] The following describes the technical solutions in the embodiments of the present invention clearly and completely with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0039] In the following description, many specific details are explained in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described here, and those skilled in the art can do it without departing from the connotation of the present invention. Similar promotion, therefore, the present invention is not limited by the specific embodiments disclosed below.

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Abstract

The invention discloses a layered coordinated voltage control method suitable for a DC micro grid. The method comprises the following steps that when different layers of the DC micro grid generate a DC voltage deviation under sagging control, improved layered coordinated voltage control is started, the intercept of a DC voltage-active power sagging characteristic curve of the corresponding layer of each end transverter is changed, the converter charges and discharges a DC bus capacitor by increasing or absorbing power, and a DC voltage is recovered to and kept in the rated value. Via the method, the deviated voltage of sagging control of each layer is returned to the rated value, the DC voltage is adjusted without difference, and the multi-end DC micro grid runs more stably.

Description

Technical field [0001] The invention relates to the technical field of a voltage control method suitable for a direct current microgrid, in particular to a voltage layered coordinated control method suitable for a direct current microgrid, and belongs to the technical field of direct current microgrid. Background technique [0002] At present, traditional energy sources are increasingly depleted and environmental problems are becoming more and more serious. Renewable clean energy, mainly wind energy and solar energy, will account for an increasing proportion of the future energy structure; at the same time, renewable energy-based Distributed power generation will also serve as a useful supplement to traditional power generation and will be widely used. The microgrid composed of small distributed power sources and loads is more suitable for connection with DC transmission lines according to the characteristics of the distributed power sources connected to it. Compared with AC mic...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/00
CPCH02J1/00
Inventor 王慧施凯伦孟建辉王毅王琛
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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