Photovoltaic maximum power control system and method

Abstract

The invention provides a photovoltaic maximum power control system and method, and belongs to the technical field of solar photovoltaic power generation. The system comprises a Boost circuit, an MPPTcontroller and a pulse generator, wherein the MPPT controller selects different MPPT control methods to stabilize the photovoltaic system at the maximum power point by continuously sampling the outputcurrent I and the output voltage U of the photovoltaic array and judging the external environment; and the MPPT controller sends the obtained voltage corresponding to the maximum power point to a pulse generator, and the pulse generator generates a PWM signal to a maximum power control main circuit so as to enable the photovoltaic array to operate at the maximum power point. According to the method and the system, the technical problems of more random physical quantities, easiness in falling into local optimal points, low tracking precision and the like are solved.

Description

technical field [0001] The invention relates to the technical field of solar photovoltaic power generation, and in particular designs a photovoltaic maximum power control system and method. Background technique [0002] With the gradual depletion of fossil energy and the increasingly prominent environmental problems, new energy power generation technologies represented by scenery have gradually become the focus of research in various countries. Photovoltaic power generation has attracted the attention of researchers because of its advantages such as no pollution, easy installation, and renewable. Maximum power tracking technology is one of the key technologies in photovoltaic research. This technology can maximize the use of solar energy for power generation, improve power generation efficiency, facilitate the promotion and application of photovoltaic power generation projects, and alleviate energy depletion and environmental pollution. The photovoltaic array is under unifo...

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Problems solved by technology

[0004] In order to overcome the deficiencies of the above-mentioned technologies, the present invention provides a photovoltaic maximum power control system and method, which adopts the compound control method of the improved bacterial foraging method and the disturbance observation method, no matter whether the photovoltaic array is under uniform illumination conditions or under shading conditions, It can quickly and accurately find the maximum power point, and can solve the technical problems of the existing technology that there are many random physical quantities, it is easy to fall into a local optimum, and the tracking accuracy is not high

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