| With the gradual depletion of fossil fuel energy,the green energy revolution in the development and utilization of renewable energy has started worldwide,and wave energy is an important part of green energy.Aiming at working characteristics for buoys,this paper proposes a wave power generation device that can be mounted on a buoy and studies its electromechanical characteristics.The main research work is as follows:Firstly,a new floating wave power generation device based on a single pendulum and vibration pick-up spring is proposed,and its power generation principle and working process are analyzed theoretically.The vibration pick-up spring mechanism can convert and enlarge the wave’s swaying excitation of the floating body into a swing of a single pendulum,thereby avoiding the energy loss and device damage caused by the linear motion inertia of the traditional vertical wave power generating device.Based on Lagrange’s equation and Hamilton energy law,the motion model of the device under wave excitation is established,and the output induced electromotive force of the device is calculated by combining the law of electromagnetic induction.Secondly,the electromechanical characteristic of the wave power generation device is simulated and analyzed.The motion laws of power generators and single pendulums under different wave steepness and frequency and different bending stiffness of vibration pick-up springs are studied through dynamic simulation.The magnetic field distribution results of the device are obtained through electromagnetic simulation,and the magnetic flux density under different stator and rotor air gaps are analyzed.According to the magnetic field distribution of the device,combined with the angular displacement of the pendulum and the law of electromagnetic induction,its output characteristics are analyzed.Based on the theory of fluid dynamics and wave motion energy,Kirchhoff’s law is used to solve the load equivalent circuit model of the power generating device,and the factors affecting the electromechanical conversion efficiency of the power generating device are analyzed theoretically.Finally,in order to test the actual power generation effect and load capacity of the floating wave power generation device,a prototype of the power generation device and an electric energy processing circuit board were produced.The output electromotive force tests under different wave conditions and bending stiffness of the vibration pickup spring are performed in the laboratory.The law obtained by the test is consistent with the simulation law,that is,the larger the wave steepness,the higher the wave frequency,and the smaller the bending stiffness of the vibration pickup spring,the larger the electromotive force output by the prototype.The embedded technology is used as the core to design the buoy locator,the hardware circuit and the running program are designed,and the One NET Io T cloud platform is used to realize the remote positioning.Combined with the electrical energy processing circuit,the light bulb with a rated voltage of 5 V and a power of 1 W and the buoy positioner are used as electrical loads to carry out a load test on the prototype.The test results show that the output voltage of the power processing circuit is a stable 5 V DC power,the light bulb and the positioner can work normally,and the positioning of the buoy is achieved successfully. |
