Photovoltaic MPPT device using improved particle swarm algorithm

Abstract

The invention discloses a photovoltaic MPPT device using an improved particle swarm algorithm, belonging to the technical field of photovoltaic power generation. The device comprises a DSP control unit, a data acquisition unit, an execution unit, a solar photovoltaic array input unit, a monitoring display unit and a load, wherein the DSP control unit comprises a switching value module, an analog quantity input module, an analog quantity output module, a central processor and a PSO controller with a PSO improved algorithm; and the execution unit comprises a PWM controller, a duty ratio unit and a Boost DC / DC circuit which are connected in sequence. According to the invention, parameters such as voltage and current output by a photovoltaic array are sampled, the PSO improved algorithm is adopted to carry out iterative search on the parameters, optimal data are transmitted to the PWM controller, and the PWM controller automatically optimizes and outputs a duty ratio signal, continuously adjusts the duty ratio, controls the conduction of a switching tube in the Boost DC / DC circuit and adjusts output voltage to allow the power working point of the photovoltaic array to change.

Description

Technical field [0001] The present invention belongs to the technical field of photovoltaic power generation, particularly, to an improved particle swarm photovoltaic MPPT device. Background technique [0002] Solar energy is clean, safe, inexhaustible and unlimited features, has become one of the hot new energy research. However, solar PV power is not high stability, temperature, illumination and load changes will cause a change in output power of solar photovoltaic cells. In order to improve the efficiency of solar energy utilization, it needs to be the maximum power point tracking (MaximumPower Point Tracking, referred to as MPPT). In the actual process of solar power, photovoltaic (Photovoltaic, referred to as PV) module in order to obtain a large output voltage, typically take the form of a plurality of photovoltaic modules connected in series to form a photovoltaic array. If the PV array, each photovoltaic module are subject to the same solar radiation, then the maximum pow...

AI Technical Summary

Problems solved by technology

However, the current PSO photovoltaic MPPT control mostly uses fixed inertia weights and learning factors, which often suffer from insufficient convergence speed, local optimization and low search accuracy.

Images