Research On The Inverter System Of Direct Drive Power Generation

Ocean waves contain a huge and sustainable clean energy.The research on the development and utilization of ocean wave energy will bring opportunities to the exploration of new energy.At present,the existing wave energy power generation technology generates electricity by transforming the wave energy and low speed motion into high speed rotation motion of the rotating generator through complex intermediate conversion devices.This kind of power generation system has many restrictions such as complex structure,high cost,low power generation efficiency and difficulty in maintenance.The direct drive wave power generation system needs no multistage conversion devices and directly transforms the wave energy into electric energy by linear motion,which could avoid many problems of traditional generation system.With the new generation system reverse grid connected,it will bring hope to the solution of electric resources shortage.What's more,the environmental pollution caused by power generation will be further controlled.In this paper,the mechanical structure,electromagnetic characteristics,mathematical model and operating principle of ABLSRG are introduced in detail.The design and characteristics of the mechanical structure of this new type of generator are expounded through the results of ANSYS Maxwell electromagnetic simulation,and the principle of power generation and the energy conversion mechanism of power generation system are briefly introduced in combination with the mathematical model.Then,based on the dSPACE platform,a single ABLSRG wave energy generation hardware system and software system are developed,and the voltage output performance of the single ABLSRG power generation system is tested when the control parameters change and the environment changes.Then,a single ABLSRG wave power generation system is designed and built on the basis of the single generator wave power generation system.The hardware and software systems of a single switched reluctance motor are designed and studied on the dSPACE platform.The single wave energy generation system is used as the generating terminal,and the inverter control system is used as the inverter end.The inverter system is integrated from the generating end to the inverter,and the single switched reluctance generation system is used to change the electricity when the parameters are changed.The output voltage of the inverter will work in an output range,and the output voltage of the single generator power generation system is converted into 220 V,50HZ output sine wave after the inverter control system.The inverter system is divided into two levels: the front stage boost stage and the rear stage inverter stage.The forward stage adopts a push-pull boost circuit based on SG3525,which pushes the output voltage of the generator to DC380 V,and the rear stage adopts the full bridge inverter circuit based on the single pole SPWM modulation based on PIC16F716 single chip,and invert DC380 V to the power frequency AC220 V.The device has input overvoltage,undervoltage protection,overcurrent protection,output overvoltage,undervoltage protection and over temperature protection.Finally,experiments show that the output waveform is low distortion,less harmonic and stable voltage.Finally,this paper builds a single line generator system based on a single line generator,and uses the hardware in the loop simulation dSPACE platform and Matlab/Simulink to experiment with the independent design of the inverter control system.