| With the development of China's economy,the energy issues needs to be solved urgently.The development of environmentally friendly and sustainable new energy has long been part of China's energy development strategy.As one of the ocean energy forms,wave possesses a huge amount of potential energy.The research on the development and utilization of wave energy will usher in opportunities for the development of new energy.Compared with present wave energy exploitation schemes,the hydraulic and turbine wave energy harvest techniques,the direct drive energy generation device does not require any mechanical transmission and directly utilizes the vertical motion of the ocean waves to convert the captured wave energy into electrical energy.This energy generation device not only reduces the complexity and cost but also eliminates the losses caused by mechanical transmissions.Nevertheless,the single generator based direct drive system cannot obtain energy beyond the collection point,and the output capacity of the system is limited.If a certain number of direct drive generators can form a wave power generation network,the amount of total can be increased.However,the marine environment at different collection points is different and the energy output from each generator(unit)varies as well.Therefore,the storage capacity of the energy storage unit is unbalanced and the utilization efficiency of wave energy is limited.The energy scheduling between energy storage units is the key to solve this problem.The high energy storage units is dispatched to the low energy storage units through the direct current(DC)bus,so that can be transferred among the energy storage units,the energy balance of the energy storage unit can be achieved,the overall network utilization efficiency can be increased.This paper first performs related theoretical analysis of the wave power generation network,including a detailed introduction to the bilateral asymmetric linear switched reluctance generator,its structure,electromagnetic characteristics,mathematical model,and working principle,etc.;The working principle of Buck-Boost bidirectional circuit and theoretical analysis of component selection is investigated;modeling and analysis of energy storage devices of supercapacitors is carried out and analysis of wave power generation network is performed.Then the hardware of the proposed wave power generation network is introduced,which is mainly composed of two parts,the energy generation hardware and the energy storage hardware,respectively.For energy generation hardware,first,the design of the wave motion simulator and the power converter board is discussed;for energy storage hardware,the design of DC/DC conversion board and the energy storage unit is investigated.Next,the voltage control strategies of the wave power generation network are implemented,including the voltage output control for the unit and the network,respectively.The charge and discharge control strategies for single energy storage unit and multiple units are implemented as well.Last,a wave power generation network platform based on d SPACE and DSP(digital signal processor)is constructed and experiments are performed for the verification of the above control strategies.Under the initial conditions of 1.9 V,2.9 V and 3.9 V respectively,the three supercapacitors can conduct energy scheduling according to the proposed control scheduling strategies.The steadystate error of the three supercapacitors can be controlled not more than ±0.2 V in the end,and any relative voltage error among the capacitors can be controlled less than ±0.25 V.The experimental results show that the proposed energy scheduling control strategy in this paper is effective and the energy of multiple storage units can be dispatched through the DC bus,with the steady-state voltage error less than ±0.25 V. |
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