Research On Control Strategy Of Hydrogen Generation System Of Photovoltaic Power Generation With Hybrid Energy Storage

Based on the national establishment of the world-class Energy Internet,vigorously develop renewable energy applications,take more complementary sustainable development strategy background,improve the utilization of renewable energy and expand consumer channels has become the focus of many scholars research direction.But renewable energy photovoltaic power generation randomness and power quality seriously affected the photovoltaic power utilization and consumptive approach,and hydrogen energy preparation equipment for power supply quality adaptability,the photovoltaic power and clean and efficient hydrogen energy combined,is an effective way to solve the bottleneck of the development of renewable energy.The hybrid energy storage system,combined with battery and super capacitor with complementary energy storage characteristics,can effectively counteract the complex power fluctuations in the integrated system and increase hydrogen production capacity.Therefore,the photovoltaic power generation hydrogen production system studied in this paper has profound theoretical significance and practical engineering value.This paper is based on the existing Photovoltaic power generation system,combined with Hydrogen Production System Research.The components of photovoltaic power generation hydrogen production system with mixed energy storage,including Photovoltaic power generation,mixed energy storage,hydrogen production load and auxiliary controller,are analyzed and simulated.First,the photovoltaic system based on the system power demand mode switching maximum power point tracking(maximum Power Point Tracking,MPPT)control model and constant voltage(Constant Voltage Control,CVC)control model is established,the control of traditional disturbance observation method and improved variable step disturbance observation method for comparative analysis,The simulation results show that the tracking speed is faster and the system output is more stable than the traditional tracking method.Then,we carry out the establishment of the real-time state of Charge-based battery and super capacitor model.Taking into account the complex power fluctuations within the integrated system and the working life of the energy storage system,the use of low-pass filter super capacitor and battery of different frequency dynamic power within the system for fast response,and according to their own state of Charge operating mode switching,The simulation shows that the mixed energy storage can be used for power exchange withthe system under different working conditions.At the same time,the hydrogen-producing load cell is used to replace the traditional load for power consumption,and the hydrogen-producing load is analyzed in principle and modeled to obtain the output characteristics of the hydrogen-producing load at different operating temperatures,and the hydrogen-producing load control mode is determined.Finally,the overall structure of photovoltaic power generation hydrogen production system containing mixed energy storage is established,and various parts of the system are coordinated and controlled by the Integrated Control Center.Based on the overall system operating state requirements and operating characteristics of each unit under each operating condition,the system is divided into four operating modes,classified according to the power flow and Hybrid energy storage System state of Charge in each mode of the system,the system may be in a working Operating state analysis.Through the Matlab /Simulink simulation platform,the system may be in the operating state of the simulation analysis,verify that the control strategy can be based on the system needs to switch mode and stable operation.