Research On Photovoltaic Power Generation And Energy Storage Technology Based On Voltage Reference Variable Step Size Algorithm And DC Decoupling

As a clean energy power generation method,photovoltaic power generation can provide power to coal mines and other enterprises,but pure photovoltaic power generation drive motors may have problems such as a single power supply form and insufficient power generation.During work,the energy feeding phenomenon of the motor frequently occurs,and the use of resistance consumption is not conducive to the effective use of energy.In view of the above problems,this article takes the independent photovoltaic power generation system driving the motor and the practical energy router as the research background,and studies the technology that combines photovoltaic power generation and energy storage,including photovoltaic maximum power point tracking and three-port full-bridge DC/DC converter decoupling.Control strategies to improve system stability and efficiency.First,in order to solve the problem of unsatisfactory tracking stability caused by improper control of the tracking step on the right side of the maximum power point in the existing photovoltaic control algorithms.This paper proposes a photovoltaic maximum power point tracking control algorithm that optimizes the right step adjustment coefficient,which is based on the existing variable step increment method.The modified step adjustment coefficient is used for variable step tracking.While ensuring fast and errorfree tracking of the maximum power point,the stability of the tracking process is increased,and the power oscillation is better reduced.This algorithm is simulated by Matlab/Simulink.The simulation results prove the correctness and effectiveness of the algorithm.Secondly,for the existing three-port full-bridge DC/DC converter decoupling control method,there is a problem of large power oscillation when controlling the DC port power transmission.This paper combines the characteristics of series and parallel resonance circuits,and proposes an improved decoupling control strategy for a three-port converter combined with a composite resonance network,which is based on the existing decoupling control methods.This method uses a composite resonance composed of parallel resonance and series resonance.The network participates in the decoupling control,which not only realizes the decoupling control of the three-port converter,provides support for recovering the energy feed of the motor,but also reduces the oscillation amplitude of the transmitted power at the DC port of the converter and reduces the oscillation loss.Simulation results verify the feasibility and reliability of the improved method.Thirdly,using the principle and algorithm of variable-frequency driving of threephase asynchronous motors,combined with the working process of photovoltaic power generation driving motors,the process of driving three-phase asynchronous motors by combining the photovoltaic power generation and energy storage technologies studied in this paper with three-phase inverter circuits.At the same time,simulation experiments verify that the researched control strategy has effective conditions for driving the motor and recovering the energy fed by the motor.Finally,the experimental platform for the research of photovoltaic power generation and energy storage technology was constructed,and the corresponding hardware circuits and software were designed.The experiments further verified that the proposed variable step photovoltaic PVPT algorithm on the right side of the voltage reference and the DC decoupling method can improve transmission Power stability.