Array Piezoelectric Wind Energy Harvesting System Based On Vortex-induced Vibration

With the rapid development of integrated circuits and wireless sensor technology,the application scenarios of micro-electronic devices based on MEMS(Micro Electro Mechanical System)are growing.The micro wind energy harvesting device can convert wind energy into electrical energy to supply power for microelectronic devices.While increasing the utilization efficiency of clean energy,it also contributes to the great journey of ’carbon peak,carbon neutrality’.Microelectronic devices are mostly used in towns,while large wind turbines are mostly installed in remote areas,and the cost of power transportation is high.Micro wind energy harvesting device has the advantages of small size and low cost,which can supply energy for micro electronic equipment and fill the shortage of wind power generation.The micro wind energy harvesting device has low output voltage and low power density at low wind speed.By optimizing the structure of the piezoelectric wind energy harvesting device,the resistance fluid is added behind the vibrating bluff body to improve the wind energy-mechanical energy conversion efficiency of the piezoelectric wind energy harvesting device.The energy recovery interface circuit is combined with the piezoelectric wind energy harvesting device to improve the energy recovery efficiency.Firstly,the research significance and research status of wind power generation and piezoelectric energy recovery are introduced.Based on the existing research,according to the principle of vortex-induced vibration and piezoelectric effect,an array piezoelectric wind energy harvesting device is designed,and the electromechanical coupling model of the piezoelectric wind energy harvesting device is analyzed.The ANSYS software is used to simulate and analyze the single piezoelectric wind energy harvesting device and the array piezoelectric wind energy harvesting device.The arrangement of the array piezoelectric wind energy harvesting device is changed to study the variation characteristics of the lift.The experimental platform is established and the simulation results are verified by experiments.Secondly,the energy recovery interface circuit is studied.The energy recovery interface circuit adopts standard energy harvesting(SEH)circuit,synchronized switch harvesting on capacitor(SSHC)circuit and parallel synchronized switch harvesting on inductor(P-SSHI)circuit.Multisim software is used to simulate and analyze the three energy recovery interface circuits.Through the study of the voltage flip characteristics of SSHC circuit and P-SSHI circuit,the control schemes of SSHC circuit and P-SSHI circuit are designed respectively,which improves the output power of the circuit.Finally,the array piezoelectric wind energy harvesting device is connected with SEH circuit,SSHC circuit and P-SSHI circuit respectively.The wind speed is selected as 5m/s,6m/s,7m/s,8m/s and 9m/s.The arrangement of the array wind energy harvesting device is optimized,and the optimal arrangement of each wind speed is analyzed.By measuring the output voltage on the load of the interface circuit,the output power is calculated and compared.The experimental results show that the output power of the three energy recovery interfaces circuit increases with the increase of wind speed.When the wind speed is 5m/s,the output power of the SSHC circuit is the highest,which is 38.51% higher than the SEH circuit and 50.27% higher than the P-SSHI circuit.When the wind speed is greater than 5m/s,the output power of the PSSHI circuit is higher than that of the SEH circuit and the SSHC circuit.When the power is the highest,it can be 89.58% higher than the SEH circuit and 7.8% higher than the SSHC circuit.