Circuit structure for photovoltaic power generation system

Abstract

The invention discloses a circuit structure of a photovoltaic power generation system. A negative output terminal of a first DC power unit is connected with a positive output terminal of a neighboring DC power unit, and the positive output terminal of the first DC power unit is connected with a positive input voltage terminal of a common DC bus of an AC power unit; the negative output terminal of a last DC power unit is connected with a negative input voltage terminal of the common DC bus of the AC power unit; the negative output terminals of all the AC power units which are connected in parallel are connected with the negative input voltage terminal of the common DC bus of the AC power unit; the positive output terminals of all the AC power units which are connected in parallel are connected with the positive input voltage terminal of the common DC bus of the AC power unit. The circuit structure solves other new problems of the photovoltaic power generation system which are caused while solving the problem of tracking the maximum power point of a branch circuit affected by shadows.

Description

technical field [0001] The invention belongs to the technical field of solar power generation, and in particular relates to a circuit structure of a photovoltaic power generation system. Background technique [0002] With global warming and the continuous consumption of natural energy, the world is facing unprecedented energy crisis and challenges. Therefore, renewable new energy such as solar energy has been paid more and more attention by people. For large-scale photovoltaic power generation systems, the centralized photovoltaic power generation system has a very large advantage considering the hardware cost. However, since the photovoltaic array is directly connected in series and parallel, the partial shadow caused by clouds and tall buildings will cause the overall output power of the photovoltaic array to drop, and the photovoltaic cells affected by the shadow will also have hot spots. Overcoming the partial shadow problem has become one of the hotspots of people's re...

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide a circuit structure of a photovoltaic power generation system, which not only solves the problem of maximum power point tracking affected by shadows, but also solves other problems caused by existing photovoltaic power generation systems when dealing with partial shadows, reducing It eliminates the power loss caused by the usual DC / DC conversion circuit working all the time, makes the DC / DC conversion circuits independent of each other, improves the system performance and safety reliability, reduces the cost of hardware, and improves the efficiency of the system

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