Photovoltaic power generation system performing maximum power point tracking for each unit group

Abstract

The present invention relates to a photovoltaic power generation system performing maximum power point tracking for each unit group which performs separate maximum power point tracking for each photovoltaic string, maximizes the inversion efficiency of an inverter by maintaining uniform input voltage from the inverter regardless of the difference between generated energy and generated voltage for each photovoltaic string, and thus improves the photovoltaic power generation efficiency. A photovoltaic power generation system performing maximum power point tracking for each unit group according to the present invention comprises: a plurality of photovoltaic strings formed by connecting a plurality of photovoltaic modules; a string optima for converting voltage generated from each of the plurality of photovoltaic strings into an output voltage of a uniform size, and controlling, for the conversion of the generated voltage, the maximum power point tracking for each photovoltaic string; and an inverter for converting the output voltage from the string optima into alternating voltage and supplying the power system therewith.

Description

technical field [0001] The present invention relates to a photovoltaic power generation system that converts DC power generated by solar cells into AC power to supply the converted AC power to a power system, and more particularly, to a photovoltaic power generation system that performs maximum power point tracking for each unit group A power generation system that performs individual maximum power point tracking for each photovoltaic string and makes the inverter's The conversion efficiency is maximized, thereby improving the efficiency of photovoltaic power generation. Background technique [0002] Since solar cells currently used for photovoltaic power generation have a very small output, a photovoltaic module (PV module) configured by connecting many solar cells in series is used to efficiently obtain required power. One such photovoltaic module can be used as a power source for the operation of street lamps or small electronic devices, however, it is difficult for the ...

AI Technical Summary

Problems solved by technology

[0011] However, although the conventional control algorithm for power tracking has the advantage of simplifying and easily controlling the control system in the case of simple control, it is difficult to quickly respond to the case of large output changes, and it is difficult to control in response to environmental factors

[0012] In addition, although complex control algorithms, such as purification control, have the advantage of being able to improve power generation efficiency, they are not easy to apply due to the high performance of the control circuit and the increase in algorithm complexity

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