Research Of Photovoltaic Power Generation System Based On The Super Capacitor Energy Storage

With the gradual depletion of fossil fuels, the development of renewable energy has become the only way to solve the world’s energy problems. In a number of renewable energy, solar energy is undoubtedly one of the most promising new energy, because it is inexhaustible, inexhaustible, does not pollute the environment and destroy the ecological balance. Thus, the development of solar energy has a huge market prospects. With the continuous development of modern science and technology, more and more national attention photovoltaic technology as solar the main form of solar energy utilization. It will certainly be a rapid development of applications in the coming decades.Stand-alone photovoltaic power generation system for the study, conducted a comprehensive theoretical analysis of the various components of the system. From the overall structure of the system, the maximum power point tracking, the super capacitor energy storage system to the inverter control strategy and parameters selection, the key technologies have made a detailed analysis and design. The main content of this paper is as follow.(1) This paper first introduces the composition and classification of the photovoltaic power generation system, and then analyze the independent system, and the structural characteristics of network systems and hybrid systems and their applications. Finally, the photovoltaic power generation system architecture of this article is proposed.(2) Introduction of photovoltaic battery classification and commonly used types of photovoltaic cells, and then analyze the output characteristic curve and work status under different ambient temperature of the photovoltaic cells of different light intensities. This paper constructs practical simulation mathematical model by improving the existing mathematical model of photovoltaic cells. Simulation results demonstrate the high accuracy and module versatility of the constructed model and close to the actual photovoltaic cell output characteristic curve which provide a theoretical basis for the operating characteristics analysis and engineering design of photovoltaic cells.(3) Commonly used in the maximum power point tracking algorithm principle is to analyze and compare their respective advantages and disadvantages. Fast dynamic response and steady state accuracy of the disturbance observation method was chosen as the maximum power point tracking control method of this article. Designing MPPT tracking controller is based on Boost converter, and simulation results show the maximum power point tracking photovoltaic system plays an important role.(4) Super capacitor energy storage principle and energy storage advantage is introduced, and a super-capacitor equivalent circuit model is established. Simulation is used to analyze the common super-capacitor in series equalizing circuit. Buck/Boost bidirectional converter and derive small-signal mathematical model is focused on the design. Voltage of the outer ring current inner bicyclic control method is based on the small signal transfer function. Building a simulation model of the charging and discharging of the super capacitor energy storage system in Matlab/Simulink, simulation results demonstrate the dual-loop control strategy to achieve the validity and reliability of the super capacitor to charge and discharge function.(5) DC/AC inverter control technology of independent photovoltaic power generation system is studied. Inverter circuit topology is analyzed and the LC low-pass filter is designed to filter out the high harmonics. Through the derivation of the mathematical model of the single-phase inverter, state feedback control is proposed based on the state space theory. The poles of the closed-loop system is configured to any desired position and optimized the allocation by state feedback control. Drawing the Bode diagram of control system theory analyze the stability of the system. Building a pole placement controller and pole optimal allocation of the simulation model, simulation results demonstrate that the significant feedback control system based on the state of the theory of state space has superiority and reliability.