DC bus voltage adjusting and MPPT unified control system and method of photovoltaic microgrid

A technology of DC bus voltage and control method is applied in photovoltaic power generation, irreversible DC power input conversion into AC power output, single-grid parallel feeding arrangement, etc., which can solve the problem of high unit investment cost and economical operation of photovoltaic microgrid system. In order to improve the efficiency of grid connection

Active Publication Date: 2015-09-02
STATE GRID CORP OF CHINA +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In most photovoltaic microgrids currently using DC bus topology, in order to realize the decoupling of DC bus voltage regulation and MPPT (Maximum Power Point Tracking, Maximum Power Point Tracking) The DC / DC converter realizes the MPPT control of the photovoltaic modules through the DC / DC link, and then realizes the adjustment and control of the DC bus voltage through the DC / AC link, but this will reduce the photovoltaic grid-connected efficiency. The higher unit investment cost (compared with the photovoltaic power station without energy storage link), will further lead to poor operating economy of the photovoltaic microgrid system

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  • DC bus voltage adjusting and MPPT unified control system and method of photovoltaic microgrid
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  • DC bus voltage adjusting and MPPT unified control system and method of photovoltaic microgrid

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Embodiment Construction

[0016] The technical scheme of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

[0017] A unified control system for photovoltaic microgrid DC bus voltage regulation and MPPT, such as figure 1 As shown, it includes photovoltaic components, DC / AC modules, and bidirectional DC / DC modules connected to the DC bus. The bidirectional DC / DC module transmits electric energy to the DC bus through the first switch. The photovoltaic components and the DC / AC module An MPPT controller and an AC current loop are sequentially connected between them, and the input end of the AC current loop is also connected with a reactive current reference signal (when running at unity power factor ), the bidirectional DC / DC module is respectively connec...

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Abstract

The invention discloses a DC bus voltage adjusting and MPPT unified control system and method of a photovoltaic microgrid, for the purposes of realizing unified control of MPPT control and DC bus voltage adjustment of a photovoltaic grid-connected inverter, improving the photovoltaic grid-connected efficiency and decreasing the operation cost of a photovoltaic microgrid system. According to the invention, unified control of the DC bus voltage adjustment and MPPT of the photovoltaic grid-connected inverter free from a DC/DC link and an energy storage apparatus comprising a DC/DC link under the condition of a common DC bus can be realized, the grid-connected efficiency of the photovoltaic inverter is improved, and the system and method provided by the invention is applied to the field of the photovoltaic microgrid.

Description

technical field [0001] The invention relates to a unified control system and method for photovoltaic microgrid DC bus voltage regulation and MPPT. Background technique [0002] Due to the advantages of renewable energy, cleanliness, and energy dispatchability, photovoltaic microgrids have received more and more attention from countries all over the world. In most photovoltaic microgrids currently using DC bus topology, in order to realize the decoupling of DC bus voltage regulation and MPPT (Maximum Power Point Tracking, Maximum Power Point Tracking) The DC / DC converter realizes the MPPT control of the photovoltaic modules through the DC / DC link, and then realizes the adjustment and control of the DC bus voltage through the DC / AC link, but this will reduce the photovoltaic grid-connected efficiency. The higher unit investment cost (compared with the photovoltaic power station without energy storage link), will further lead to poor operating economy of the photovoltaic micro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02M7/48
CPCY02E10/56
Inventor 谢磊韦徵王彤宋飞
Owner STATE GRID CORP OF CHINA
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