Solar photovoltaic maximum power point tracking (MPPT) control system

Abstract

The invention discloses a solar photovoltaic maximum power point tracking (MPPT) control system, which comprises a battery voltage sampling circuit, a diode D1, a current sampling circuit and a load voltage sampling circuit, wherein the battery voltage sampling circuit is connected between a positive electrode and a negative electrode of a solar photovoltaic battery; an anode of the diode D1 is connected with the positive electrode of the solar photovoltaic battery, and a cathode of the diode D1 is connected with a drain of a transistor; the current sampling circuit is connected with a source of the transistor; the load voltage sampling circuit is connected with a load in parallel; output ends of the battery voltage sampling circuit, the current sampling circuit and the load voltage sampling circuit are respectively connected with a controller; the controller outputs a pulse width modulation (PWM) signal to a gate of the transistor; a disturbance current is generated by changing the duty ratio of the PWM signal; and the output of the solar photovoltaic battery is controlled by controlling the disturbance direction to reach a maximum power point. By adoption of the solar photovoltaic MPPT control system, the phenomena of low tracking speed and swinging around a maximum operating voltage in the conventional MPPT technology are avoided, and the output power of the solar photovoltaic battery is maximized.

Description

technical field [0001] The invention relates to a solar photovoltaic charging control technology, in particular to a solar photovoltaic MPPT control system. Background technique [0002] The development and application of new energy has become an inevitable trend in the development of the world today. Solar energy is a new energy source with great potential, and photovoltaic power generation is one of the main ways to utilize solar energy at present. Solar photovoltaic power generation is of great significance to alleviating the energy crisis and reducing environmental pollution, and has broad application prospects. [0003] Since the characteristics of the photovoltaic array are affected by the intensity of sunlight (or radiation intensity) and ambient temperature, the inverter must also meet the operating requirements of the photovoltaic array. The output voltage of the photovoltaic array must approach the output voltage of the maximum power point through the adjustment ...

AI Technical Summary

Problems solved by technology

[0006] The traditional voltage perturbation method uses a fixed step size to perturb the output voltage of the photovoltaic array, and there is a problem that the operating voltage swings near the maximum operating voltage of the photovoltaic array.

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