Maximum power point tracking (MPPT) control device of photovoltaic generating system

Abstract

The invention belongs to the field of photovoltaic power generation, and discloses a MPPT control device of a photovoltaic generating system, which comprises an oscillating circuit, an MPPT circuit, a comparison circuit, a PWM generating circuit, a DC-DC circuit, a current detection circuit and a voltage feedback circuit, wherein the output ends of the oscillating circuit and the comparison circuit are connected with the PWM generating circuit; the output end of the PWM generating circuit is connected with the DC-DC circuit; the output end of the DC-DC circuit is connected with an accumulator, the current detection circuit and the voltage feedback circuit; the output ends of the current detection circuit and the voltage feedback circuit are connected with the comparison circuit; and the input ends of the MPPT circuit and the DC-DC circuit are connected with a photovoltaic array. A hardware circuit (MPPT circuit) is used for searching the maximum power point, and the duty ratio of the PWM is controlled to regulate the load impedance of the photovoltaic array, so that the photovoltaic array can work at the maximum power point, thereby enhancing the utilization ratio of the photovoltaic array. The invention has the advantages of easy realization, high efficiency, high stability and low cost.

Description

technical field [0001] The invention relates to a maximum power point tracking control device applied to a photovoltaic power generation system, belonging to the field of photovoltaic power generation. Background technique [0002] Due to the clean and renewable advantages of solar energy, photovoltaic power generation technology has been widely valued, and how to maximize the preservation of electric energy generated by photovoltaic arrays has become the focus of attention. [0003] The output of the photovoltaic array presents nonlinear characteristics, and its output power is affected by temperature, radiation intensity and load. The increase in temperature will reduce the power output of the photovoltaic array, and the light intensity will increase the power output of the photovoltaic array. Under the same temperature and light intensity, different loads will also change the power output characteristic curve of the photovoltaic array. If the output of the photovoltaic ...

AI Technical Summary

Problems solved by technology

If the output of the photovoltaic array is directly connected to the battery, the output power is often not the maximum power point, resulting in energy loss

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