Independent photovoltaic power generation system and working method for tracking maximum power thereof

Abstract

An independent photovoltaic power generation system comprises a solar cell component, a DC converter and a storage battery. A working method for the tracking maximum power of the independent photovoltaic power generation system is characterized in that the method comprises the following steps: establishing the independent photovoltaic power generation system and determining the composition of the system; determining the input signal and the output signal of the DC converter; determining the relationship between the action for tracking the maximum power of the solar cell component and the action of the DC converter; and determining the work plan for tracking the maximum power of the system. The invention has the following advantages: (1) the structure is structure and has various loads; (2) the adoption of tracking method of maximum power can improve the working efficiency of the solar cell to ensure that the maximum electric energy can be supplied to the load; (3) simultaneously, a DC booster transformer is installed between the solar cell and the load to improve the output voltage of the photovoltaic cell so as to meet the requirements for voltage of the load.

Description

(1) Technical field: [0001] The invention belongs to the technical field of photovoltaic power generation and power electronics, in particular to an independent photovoltaic power generation system and a working method for tracking its maximum power. (two) background technology: [0002] With the implementation of the national new energy power generation strategy, the development and utilization of clean energy such as photovoltaic power generation has broad prospects. At present, photovoltaic grid-connected power generation systems and large-scale photovoltaic power plants have been established. The photovoltaic roof plan under development has also been vigorously supported by national policies. support. The problem of photovoltaic power generation is that the output characteristics of photovoltaic cells are greatly affected by the external environment. The intensity of light and temperature have a relatively large impact on the output of solar cells. Photovoltaic cells can...

AI Technical Summary

Problems solved by technology

The problem of photovoltaic power generation is that the output characteristics of photovoltaic cells are greatly affected by the external environment. The intensity of light and temperature have a relatively large impact on the output of solar cells. Photovoltaic cells cannot always output the maximum power, so there is a gap between the solar cell and the load. Set the DC converter to realize the tracking of the maximum power point, ensure that the solar cell always outputs the maximum power, and improve the overall working efficiency of the photovoltaic system

At present, there are many schemes for maximum power tracking control of photovoltaic systems, such as constant voltage tracking method, interference observation method, etc., these methods have certain limitations, and have the disadvantage of repeated oscillation of output power in a stable state

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