Method and circuit for improving output power of photovoltaic module

Abstract

The invention discloses a method for improving output power of a photovoltaic module; serial-connected photovoltaic cell elements in the photovoltaic module are divided into groups uniformly, the output voltage ratio of the two adjacent photovoltaic cell element groups is ensured to be equal to the voltage ratio of the maximum power points of the adjacent photovoltaic cell element groups. According to the condition that the photovoltaic cell elements are divided into two groups uniformly, a correcting circuit is provided; the correcting circuit comprises a P channel MOSFET pipe, an N channel MOSFET pipe, an inductor and two capacitors; wherein, the drain electrode of the P channel MOSFET pipe is serially connected with the drain electrode of the N channel MOSFET pipe for forming a MOSFET bridge arm, the two capacitors are serially connected into a capacitance bridge arm, the MOSFET bridge arm is connected with the capacitance bridge arm in parallel, the connecting point of the two MOSFET pipes is connected with the connecting point of the two capacitors by the inductor. The energy conversion efficiency of the photovoltaic module is effectively improved under the condition of local shadow; in the method of the maximum power point tracking of the photovoltaic module of the invention, a normal tracking method can be avoided from falling into a local extreme point.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a method and circuit for increasing the output power of a photovoltaic module, which is suitable for tracking the maximum power of the photovoltaic module. Background technique [0002] With the increasingly serious energy crisis and environmental problems, countries all over the world have begun to vigorously develop and apply clean renewable energy. Among them, photovoltaic power generation technology using sunlight as energy is an important strategy to solve energy crisis and environmental problems and achieve sustainable development. Extensive research and application. [0003] In the solar photovoltaic power generation system, the photovoltaic module converts solar energy into DC power, and then the power electronic converter converts the DC power into various forms of power required by the load. Since the current-voltage (I-V) and power-voltage (P-V) ...

AI Technical Summary

Problems solved by technology

People have also done some research work on the maximum power point (MPP) tracking of photovoltaic modules under partial shading conditions, and proposed some global maximum power tracking algorithms under partial shading conditions. These algorithms have a common deficiency: passive search photovoltaic modules The global maximum power point of the module, the implementation of the algorithm is more complicated, and the actual energy obtained is far less than the energy that can be output by the current photovoltaic module

Images