Photovoltaic power generating device based on direct current bus

Abstract

The invention discloses a photovoltaic power generating device based on a direct current bus. The photovoltaic power generating device comprises a current acquiring unit, a voltage acquiring unit, a control unit, a mode control unit, a driving circuit and a plurality of photovoltaic battery pack string units respectively connected with the direct current bus in parallel; each photovoltaic battery pack string unit comprises a battery pack string and a boost circuit; the battery pack string is connected with the direct current bus through the boost circuit; an input end of each of the current acquiring unit and the voltage acquiring unit is connected with the battery pack string; and an output end of each of the current acquiring unit and the voltage acquiring unit is connected with an input end of the control unit; an output end of the control unit is connected with the mode control unit; and an output end of the control unit is connected with a switching tube of the boost circuit through the driving circuit. The photovoltaic power generating device has the advantages of high generating efficiency, less power consumption, flexible system structure and good sunlight intensity and thermal adaptability.

Description

technical field [0001] The invention relates to the technical field of solar photovoltaic power generation, in particular to a photovoltaic power generation device based on a direct current bus. Background technique [0002] Solar energy is a clean and efficient green energy. The promotion and application of solar energy is of great significance to the sustainable development of the world economy. Converting solar energy into electrical energy through photovoltaic grid-connected power generation systems is currently one of the main solar energy utilization methods. According to the combination of photovoltaic cell modules, the current photovoltaic grid-connected power generation system mainly includes three types: centralized type, string (multi-string) type, and module integrated type. [0003] The centralized photovoltaic grid-connected power generation system is mainly composed of photovoltaic arrays, inverters and DC buses. It is the earliest form of grid-connected photo...

AI Technical Summary

Problems solved by technology

However, this kind of AC inverter integrated photovoltaic module has two defects: if the inverter module uses a DC / AC inverter, it is necessary to realize the MPPT of a single module and the unit power factor of the grid side, and the control is complicated

However, in the case of higher power, more DC integrated photovoltaic modules are also required, and the price is higher

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