Modular full direct current photovoltaic system and control method thereof

A photovoltaic system and control method technology, applied in the field of solar photovoltaic power generation research, can solve problems such as large line loss and long low-voltage lines, and achieve the effects of reducing line loss, improving power density, and high conversion efficiency

Active Publication Date: 2014-10-22
XI AN JIAOTONG UNIV
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Problems solved by technology

[0004] The centralized photovoltaic power generation and transmission operation mode has the advantages of mature technology and low cost. However, with the continuous increase of new energy generation capacity and the continuous improvement of power transmission and distribution technology, this solution has long low-voltage lines and large line losses. problem, and with the increasing scale of photovoltaic power generation, this problem will be further highlighted

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  • Modular full direct current photovoltaic system and control method thereof
  • Modular full direct current photovoltaic system and control method thereof
  • Modular full direct current photovoltaic system and control method thereof

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Embodiment Construction

[0027] The modular full DC photovoltaic power generation system of the present invention includes n solar photovoltaic arrays and n DC-DC converter modules, where n is a natural number greater than 1, wherein the input end of each DC-DC module is connected to a photovoltaic array respectively, The output ends of n DC-DC converters are connected in series to build a DC bus, and the DC bus is then connected to the grid for power generation through an MMC grid-connected inverter device.

[0028] There is no control signal interconnection line between the n DC-DC converter modules, and there is no signal interconnection line between the n DC-DC converter modules and the MMC inverter.

[0029] see image 3 As shown, a single DC-DC converter module in the present invention is connected with its own control loop, and the control loop includes a maximum power tracking unit. The input terminal of the DC-DC converter module (that is, the terminal connected to the photovoltaic array) de...

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Abstract

The invention discloses a modular full direct current photovoltaic system and a control method thereof. The system comprises n DC (direct current)-DC converter modules and an MMC (Multi Media Card) centralized inverter, and every DC-DC converter module is connected with an independent control loop and a maximum power tracking control function so as to ensure that a photovoltaic battery pack connected with every DC-DC converter works on the highest point of the output power. According to the modular full direct current photovoltaic system and a control method thereof, a direct current bus is formed by connecting the output ends of a plurality of DC-DC converter modules in series, and the high-power grid-connected power generation function is achieved through the centralized MMC inverter. The direct current bus can effectively reduce the operating loss of the entire system and structurally improve the operating efficiency of the system.

Description

【Technical field】 [0001] The invention belongs to the research field of solar photovoltaic power generation, and in particular relates to a modularized full DC photovoltaic system and a control method thereof. 【Background technique】 [0002] With the increasing scale of photovoltaic power generation, photovoltaic production capacity is no longer limited to supplementary energy, but is moving towards the direction of alternative energy. Research on large-scale photovoltaic power generation has also attracted widespread attention. [0003] The current concept of photovoltaic power generation, the structure of photovoltaic electric field, grid-connected power generation devices and corresponding operating technologies are increasingly unable to cope with the consumption of renewable new energy that is gradually increasing in scale. The structure of the current mainstream photovoltaic electric field is as follows: figure 1 As shown, solar panels are connected in series and para...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02S40/30
CPCY02E10/56
Inventor 王丰卓放易皓刘伟增
Owner XI AN JIAOTONG UNIV
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