Variable voltage control method of photovoltaic cell

A photovoltaic cell and voltage transformation control technology, which is applied in the direction of photovoltaic power generation, electric variable adjustment, control/regulation system, etc., can solve the problems affecting the control accuracy of the control system, and achieve the effect of strong practicability, few changes, and easy implementation

Active Publication Date: 2016-04-20
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

This patent takes the output current of the Boost converter as the inner loop and the output voltage as the outer loop to form a doubl...

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  • Variable voltage control method of photovoltaic cell

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Embodiment Construction

[0038] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0039] The structure of the photovoltaic system involved in the present invention is as figure 1 As shown, the photovoltaic system is mainly composed of photovoltaic cells, transformer controllers, Boost converters, busbars and loads. The photovoltaic cells are connected to the busbar through the Boost converter and output power to the busbar. The load is connected to the busbar and consumes the power on the busbar. , figure 1 Among them, PV means a photovoltaic cell, BOOST means a Boost controller, and R means a load. The key content involved in the present invention is the design o...

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Abstract

The invention relates to a variable voltage control method of a photovoltaic cell. The variable voltage control method comprises the following steps: (1) external loop control: acquiring voltage of a bus bar in real time; obtaining a bus bar voltage regulation and control value according to bus bar voltage and a bus bar voltage rated value; obtaining a photovoltaic cell output voltage reference value according to the bus bar voltage regulation and control value and photovoltaic maximum power point voltage; (2) internal loop control: acquiring photovoltaic cell output voltage in real time, and obtaining a switch-off ratio of a Boost converter according to the photovoltaic cell output voltage reference value and the photovoltaic cell output voltage; (3) regulating and controlling output power and output voltage of the photovoltaic cell according to the switch-off ratio of the Boost converter. Compared with the prior art, the variable voltage control method adopts voltage double-closed-loop control so that all points on a P-U characteristic curve of the photovoltaic cell can be stabilized at stable points of a photovoltaic system; the variable voltage control method has the advantages of high control precision, good anti-interference performance, high practicability and the like.

Description

technical field [0001] The invention relates to the field of photovoltaic energy storage, in particular to a method for controlling voltage transformation of photovoltaic cells. Background technique [0002] In recent years, with the development of my country's economy, the two major problems of energy shortage and environmental pollution have become increasingly prominent. These two problems are mainly caused by the consumption and extensive use of fossil energy. Therefore, the development of clean, efficient and pollution-free energy has become a solution. The most effective way to solve these two problems. [0003] Among various renewable energy sources, solar energy is undoubtedly one of the most widely distributed energy sources. Because photovoltaic cells have the advantages of safety and reliability, no geographical restrictions, easy maintenance, short construction period, random scale, and can be easily combined with buildings, photovoltaic cell power generation is ...

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Application Information

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IPC IPC(8): H02J3/38H02M3/155
CPCH02J3/383H02M3/155Y02E10/56
Inventor 程启明杨小龙褚思远张强黄山张海清
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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