Control device based on photovoltaic maximum power point tracking

Abstract

The invention provides a control device based on photovoltaic maximum power point tracking. The control device includes a sensor unit, a voltage detection sampling unit, a current detection sampling unit, a PLC controller and an execution mechanism. The execution mechanism includes a Boost circuit and a photovoltaic cell, the photovoltaic cell is connected with the Boost circuit through a filter circuit, the Boost circuit is in parallel with a load RL, the sensor unit includes a light sensor and a temperature sensor, the light sensor and the temperature sensor are arranged on the photovoltaic cell, the light sensor and the temperature sensor are connected to the input end of the PLC controller, the output end of the PLC controller is connected to the control end of a Boost converter, and the input end of the PLC controller is connected with the photovoltaic cell through the voltage detection sampling unit and the current detection sampling unit. The device acquires the detection data through temperature, light, voltage, and current, makes full use of the PLC programming advantages, programs the PLC procedures through an intelligent algorithm, and outputs the duty ratio of a Boost circuit switch tube, thereby realizing the MPPT intelligent tracking.

Description

technical field [0001] The invention relates to a control device based on photovoltaic maximum power point tracking. Background technique [0002] Since photovoltaic power generation technology can convert non-polluting and renewable solar energy into conveniently stored electrical energy, it has attracted increasing attention and attention in today's global energy shortage and serious environmental pollution. However, photovoltaic power generation has been facing the problem of low conversion efficiency. Maximum power tracking technology is currently recognized as an effective means to improve the efficiency of photovoltaic cells. [0003] At present, photovoltaic MPPT widely uses single-chip microcomputer as the core controller, and adopts two basic tracking methods: observation perturbation method and conductance incremental method. There are some disadvantages: First, the two basic methods adopt a single open-loop structure for the output power, which does not take into...

AI Technical Summary

Problems solved by technology

There are some disadvantages: First, the two basic methods adopt a single open-loop structure for the output power, which does not take into account the dynamic coupling between the influencing factors, resulting in reduced tracking efficiency; second, the core controller does not have good reliability and is easy to program. The function can realize the programmable logic controller PLC of intelligent control, resulting in the reduction of tracking accuracy

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