Simulation Of Wave Energy Generation Process And Stability Of Electric Energy Conversion

In order to alleviate the contradiction between supply and demand of energy,solving the excessive emission of CO2 caused by environmental problems,developing and developed countries in the development of ocean energy,reducing carbon emissions,and promote the transformation of energy consumption structure on the agreement,including wave energy because of its high power density,big can be mined,is a hot spot in the government and the scientific research at home and abroad.The research object of this paper to adopt hydraulic transmission,hydraulic cylinder,accumulator,hydraulic motor)oscillation can float type wave power generation device,for its widespread system under different wave conditions hit big and the output rotational speed fluctuation,the output power unstable problem,using the software of modeling and simulation method to simulate the process of energy conversion,explore under different wave conditions remain stable output power system control strategyFirst of all,this paper introduces the present situation of development of wave energy and different types of typical wave energy device both at home and abroad,and then put forward the main research content of the subject for hydraulic PTO(Power Take-Off)system and AC-DC stability.Secondly,based on the principle of the oscillating float type wave power generation device,the AMESim simulation model of wave power generation with the maximum power of 5kW is designed,and the energy transfer process of the actual wave power generation device is simulated with regular waves as input.Through the simulation analysis of the accumulator and other key parameters on the influence of the wave energy power generation energy transfer process,and put forward according to different wave conditions a variable damping control strategy,the simulation analysis verified the good control effect,make the wave energy power generation device smaller internal shocks in the process of energy conversion,the output power is more stable.Then,in view of the hydraulic PTO system output alternating current quality is poor,can not directly use of the characteristics of the design of the wave energy power generation device PMSG-PWM rectifier voltage regulation system,established the mathematical model of AC-DC circuit,on the basis of the introduced this system uses the voltage control strategy of voltage loop can inhibit the effects of voltage disturbance,current inner loop decoupling algorithm can eliminate the coupling relationship between d and q axis,and play a key role for current control of SVPWM algorithm builds,encapsulation.Finally,PMSG-PWM rectifier voltage regulator of wave energy power generation device is established in simulation model,and its important simulation parameters are calculated and set,and then according to the output characteristics of the hydraulic system under different wave conditions set the variable resistance load,variable DC bus voltage and change the input speed in three different conditions are simulated and verified the double loop based on the current feed-forward decoupling controller can stabilize the DC bus voltage,and keep the power factor in ac side is 1,improve the output quality of electric power.By means of theoretical calculation and simulation analysis,this paper studies the energy conversion rule of wave power generation device and summarizes the regulation rule under different simulated wave conditions,which has certain guiding significance for practical device design.