A kind of mppt algorithm and its hardware structure

Abstract

The invention discloses a novel MPPT algorithm and a method for obtaining hardware for the novel MPPT algorithm. The novel MPPT algorithm comprises the steps that the open-circuit voltage of a solar cell panel and the battery voltage at present are sampled and measured; when the open-circuit voltage of the solar cell panel is higher than the battery voltage, tracking is started, and a master control unit outputs PSMC1A, PSMC1B and PSMC2A; the PSMC1A outputs PWM1 through an AND logic circuit, and the PSMC1B and PSMC2A output PWM2 through the AND logic circuit; the PWM1 and the PWM2 output PWMH and PWML respectively through a driving circuit unit; a synchronous rectification unit is driven by the PWMH and the PWML to scan the P-V curve of the solar cell panel, and the maximum power point of the solar cell panel is obtained by sampling output current in real time through a comparison current sampling unit. According to the novel MPPT algorithm and the method for obtaining the hardware for the novel MPPT algorithm, the maximum power point of the solar cell panel can be found accurately and rapidly, limitation of the environmental factors such as illumination, temperature and shadow shading is avoided, the tracking speed is high, and the efficiency is high.

Description

technical field [0001] The invention relates to the technical field of maximum power point tracking of solar panels, in particular to an MPPT algorithm and its hardware structure. Background technique [0002] Since the output characteristics of solar panels are nonlinear and are mainly affected by the external environment such as light intensity and temperature, the maximum power point often changes. The purpose of the MPPT controller is to improve the system efficiency, and strive to adjust the system parameters in real time according to different conditions, so that the solar panels can always work near the maximum operating power point. [0003] At present, the relatively mature MPPT algorithms mainly include the perturbation and observation method, the incremental conductance method, and the constant voltage method. These technologies are generally adjusted with voltage as a reference value. The most widely used method is the perturbation and observation method, which ...

AI Technical Summary

Problems solved by technology

The most widely used method is the perturbation and observation method, which is widely used because of its simple algorithm, easy implementation and low technical requirements, but it also has obvious shortcomings. The principle of the perturbation and observation method is to perturb the output voltage of the battery panel, and follow The principle of increasing the output power is used to control the system. In the steady state, the system will oscillate near the maximum power point, resulting in power loss, and the system is prone to misjudgment when the light intensity or temperature changes rapidly.

In addition, when part of the solar panel is shaded, the P-V curve of the solar panel will have multiple power peak points. In this case, the traditional tracking algorithm cannot determine which peak is the maximum power point.

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