基于涡激振动的压电式微型风力发电系统

Piezoelectric micro wind power generation system based onvortex-induced vibration

针对传统桨叶风力发电系统体积庞大、不适用于微小型电子系统的问题,利用压电材料、钝体、接口电路,设计了一种微型风力发电系统。基于涡激振动原理改进了发电装置的能量回收电路,既可对风能进行有效回收,又能输出较高电压,解决了微电子器件的供能需求。分析了装置的固有频率,对两种接口电路进行了仿真分析,通过实验研究了装置使用VD接口电路后,在不同风速下的输出电压特性,以及在不同负载、不同风速的条件下的输出电压与输出功率特性。实验结果表明:输出电压、功率随风速增加而增加,在风速22 m/s时,最大开路电压有效值为36.2 V,存在最优负载使得输出功率最高,实测为560 kΩ,最高输出功率为375.5μW,相比标准(Standard)电路提升了7.07%,可独立对微电子器件供能。

Aiming at the problem that traditional blade wind power generation system is bulky,which is not suitable for micro electronic system,a micro wind power generation system is designed by using piezoelectric material,blunt body and interface circuit.Based on the principle of vortex induced vibration,the energy recovery circuit of power generation device is improved,which can not only effectively recover the wind energy,but also output high voltage,and solve the energy supply demand of microelectronic devices.The natural frequency of the device is analyzed,and two kinds of interface circuits are simulated.The output voltage characteristics of the device under different wind speeds,and the output voltage and output power characteristics under different loads and wind speeds are studied through experiments.The experimental results show that the output voltage and power increase with the increase of wind speed.When the wind speed is 22 m/s,the maximum open circuit voltage effective value is 36.2 V.There is an optimal load that makes the output power the highest.The measured value is 560 kΩ,the maximum output power is 375.5μW,which is 7.07%higher than the standard circuit.It can supply energy to microelectronic devices independently.