Research And Design On Electrical Conversion Systems Of Wave Power Generation Device

The demand of world energy is increasing and the reserves of natural resources becomesmore and more less, both of them are the reasons why we have to develop new energy. Inrecent years, many countries pay more attention on the Wave energy, because the Waveenergy is renewable, no pollution and rich in storage compared with traditional energysources. Due to the randomness of the wave (wave height and frequency are time-varyingwith different sea conditions), the amplitude and frequency of multi-phase AC from thepermanent magnet linear generator are unstable and time-varying. So these energy can’t beused by load directly. Firstly, it must be transformated and processed. The unstable electricalenergy generated by the generator is converted to stable power for the user or device by thestage power conversion control system.The paper proposed one energy device processing system on the characteristics of wavepower generation system. Comprehensive comparison of the characteristics of the variousconversion topology, two-stage DC/DC converter system structure was taken. The front stageDC/DC converter was a Boost non-isolated converter and the second stage was a isolatedphase-shifted full-bridge device. To solve the control delay in traditional control method, onecycle control was taken in Boost converter for quickly tracking the input and adjusting in oneperiod. The double-current rectifier and phase-shifted full-bridge conversion topology wereused in secondary part. Compared with full-wave rectifier phase-shifted full-bridgezero-voltage soft switching converter, it can achieve a wide load range without duty loss.What’s more it can limit the diode voltage spike in the secondary and greatly improvedevice’s efficiency.The first three chapter introduce the research background of wave generation, the theoryof one cycle controlled Boost converter and phase-shifted full-bridge zero-voltage-switchedPWM converter. The small signal model was given after analyzing the current doublerrectifier phase-shifted full-bridge circuit for designing control system. At the same time, usethe Matlab simulation proves the advantages of double current rectifier PS-FB PWMconvertor.The hardware and software design were introduced in the chapter4. The parameterscalculation, the selection of the power device, transformer and control system design weregiven in hardware. The software design introduced the flow chart of the system andsub-module. At last, in order to verify the designed system, a matlab model and a48V/10A prototypewere built. The simulation and experiments verify the feasibility and reliability of powerconverter.