| With the rapid development of human society and economy,the energy shortage and environmental pollution problems become increasingly serious,renewable energy is a clean,pollution-free,inexhaustible energy,which can meet the energy needs of the human social development.Wave energy is a renewable energy,and it has high power density,rich reserves,predictability and other advantages,the rational development and utilization of wave power generation can effectively alleviate the current world energy crisis and environmental pollution issues.the linear permanent magnet generator as the generator is used in the direct-drive wave power generation,the wave fluctuates directly on the translator of the linear generator,the wave energy can be transformed directly into electricity power,which can reduce the power losses and improve the utilization of the wave energy.In this paper,the wave energy optimal energy capture control strategy has been researched based on the direct-drive wave energy generation system,the simulation and hardware experiment are carried out to test and verify the correctness and flexible of the control strategy.The main contents of this paper are shown as the following:1)The background and significance of wave power generation are introduced in detail.At the same time,the research status of control strategy of direct drive type wave power generation system is analyzed,and the different control strategies are briefly analyzed.2)The basic structure of the linear permanent magnet generator is studied,and the working principle of the linear permanent magnet is introduced.The mathematical model of the linear permanent magnet and the formula of coordinate transformation are also given.Besides,The design structure of the linear permanent magnet is experimentally analyzed,and the simulation waveform of the prototype is analyzed.3)The control strategy of the generator-side rectifier of the direct-drive wave power generation system and the control strategy of the grid-side inverter are studied.The energy tracking control strategy of the generator-side rectifier and the voltage-oriented vector control strategy of the grid-side inverter are proposed.The structure of the rectifier and the inverter are also designed.At the same time,the working principle and control algorithm of SVPWM space vector pulse width modulation are introduced.4)Based on the proposed generator-side rectifier and the grid-side inverter control strategy,the simulation model of the generator-side rectifier and the grid-side inverter system is set up respectively.After the two simulation models are debugged successfully,the two parts are connected with each other,and the simulation results are analyzed in details.5)The hardware circuit of the experimental platform of the direct drive type wave power generation system is designed,which includes the experimental generator,the linear hall sampling circuit board and the control circuit,and a method based on the direction of motion detection without position detection is proposed.In this paper,the software programming is also introduced,and the hardware circuit and software program are debugged accordingly.6)Finally,the hardware platform of the direct-drive wave energy generation system is experimented,in order to ensure the safety of the experiment and protect the structure of the linear permanent magnet generator,besides,in order to reduce the grid impact,firstly,grid-side inverter is tested,when the DC side voltage is controlled to be stability,the generator-side rectifier is connected to the grid-side inverter,and the experimental results were studied and analyzed. |
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