Control method for improving output utilization rate of photovoltaic cell panel

Abstract

The invention discloses a control method for improving the output utilization rate of a photovoltaic cell panel. The control method is based on a direct-current-side switching topological structure ofa photovoltaic grid-connected system. The overall topological structure of the photovoltaic grid-connected system is as follows: a photovoltaic array and an inverter are connected by a switching device including an on-off device, a controller, and a signal acquisition processor. The control method comprises: a photovoltaic system parameter and a direct-current-side real-time current and voltage are obtained; numerical values of output powers of N series of cell panels are grouped and a cell panel output utilization rate objective function is constructed; and the switching device switches theinverter path number automatically based on the objective function, so that the photovoltaic system works in an optimal state all the time. According to the invention, in order to solve the low illumination problem and partial shadow problem of the cell panel, the control method enables the direct-current-side circuit to be switched to improve the output utilization rate of the photovoltaic cell panel.

Description

Technical field [0001] The invention relates to the technical field of photovoltaic power generation system planning, in particular to a control method for improving the output utilization rate of a photovoltaic battery panel. Background technique [0002] In recent years, photovoltaic power generation technology is one of the rapidly developing renewable clean energy technologies. The two main power generation methods of photovoltaic power generation are distributed power generation and centralized power generation, and the former is becoming more and more popular in the international market. Distributed power generation mainly uses string inverters to generate power. Under the influence of changes in illumination, there are still problems such as low power generation efficiency, high grid-connected harmonic distortion rate, and large system losses, which reduce economic benefits to a certain extent , Increase the instability of the grid; [0003] At present, improving the opera...

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Problems solved by technology

Distributed power generation mainly uses string inverters to generate power. Under the influence of light changes, there are still problems such as low power generation efficiency, high grid-connected harmonic distortion rate, and large system loss, which reduces economic benefits to a certain extent. , increasing grid instability;

[0003] At present, most of the improvement of photovoltaic system performance is to optimize the photovoltaic system equipment, etc., and the optimization of the matching connection between the photovoltaic array and the inverter on the DC side is still immature

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