Research On Modeling And Synchronous Transmission Of Signal/Power Strategy For Wind/PV Hybrid DC Microgrid

Wind/PV Hybrid DC Microgrid integrates Wind/PV complementary power generation system,Energy Storage System and local load into a controllable autonomous system.Take advantage of the characteristics of seasonal complementation and day and night complementation of scenery.The Energy Ctorage Systems can reduce the intermittency and volatility of wind power generation.DC Microgrid has many advantages,such as low cost,no need to consider the power and phase,supply large capacity power.In this thesis,research on modeling and synchronous transmission of Energy/Signal strategy for Wind/PV hybrid DC MicrogridFirst,In order to make full use of Wind and PV,adopt Maximun Power Point Tracking(MPPT)strategy.Based on the power balance in the system and the energy storage system,the charge and discharge control strategy of the energy storage system is designed.Secondly,In order to maintain the voltage stability of DC bus and the power balance of the system,the coordinated control strategy of DC microgrid system is designed.The operation conditions of DC microgrid are classified and the switching conditions and coordination control methods are set to ensure the stable operation of the system under different working conditions.Wind/PV Hybrid DC Microgrid simulation model was built on the MATLAB/Simulink simulation platform to verify the different working conditions.Third,the theoretical basis of data-electric composite modulation is analyzed.DC microgrid contains a variety of converters.By stacking data signals in the control loop,power regulation can be carried out while data signals are carried out.Based on the combined modulation method of power modulated wave and power carrier,the strategies of signal modulation and demodulation are analyzed.Finally,Frequency Shift Keying(FSK)is used for compound modulation of power transmission,and fast Fourier transform(FFT)technology is used to demodulate the signal.The simulation verifies the feasibility of synchronous transmission of power and signal in DC microgrid.