| With the accelerated development of the current society,high-quality life has been pursued by people.There are growing problems between energy supply and demand.Among all the energy and related technologies,power grid is one of the most important fields.In recent years,As the direction of future power grid development,Smart grid has significant research values.In the smart grid,the most critical link is the micro-grid which can self-distribute grid energy to maximize the use of grid energy.In this thesis,the single-phase full-bridge inverter circuit is first provided which plays a vital role in the micro-grid.On the basis of this single-phase full-bridge inverter circuit,the full-bridge inverter topology is innovation presented.By constructing a simulation system combining the experimental platform,the proposed method and design in this thesis is verified.The specific research work is as follows:1)Study on the design of single-phase full-bridge voltage inverters.Firstly,this thesis introduces the inverter of the energy conversion device of the microgrid,and analyzes the topology structure and the working principle of the single-phase full-bridge inverter circuit in detail.Based on the calculation method of the modulation quantity of the unipolar modulation technology,the mathematical model of single-phase full-bridge inverter circuit is constructed.The corresponding controller is designed for the mathematical model,and the parameters of the voltage outer loop and current inner loop of the controller are set.Then the hardware design and software design of single-phase full bridge inverse are introduced;Finally,the simulation experiment is carried out on the single-phase full-bridge inverter circuit with pure resistive load and non-linear load through the simulation environment.The experimental results verify the feasibility of the controller design.2)Research on the distributed power grid-connected technology of the microgrid.Based on the single-phase full-bridge inverter circuit,this thesis proposes an improved interleaved parallel inverter topology.The interleaved parallel full-bridge inverter has three high-frequency outputs,and its carrier is 120° out of phase.The interleaving and parallel connection can effectively reduce the current ripple.Finally,using the Simulink module in MALAB,the inter-parallel full-bridge inverter topology simulation is built.Combined with the actual platform of the laboratory,the inverters are tested withdifferent loads,and the correctness of the theoretical analysis of the experimental waveform verification is recorded.3)Study on the energy optimization algorithm for fast plugging microgrid group.Aiming at the problem of energy scheduling optimization in microgrid group,this thesis proposes an optimization algorithm.The specific steps are as follows: firstly,establish the mathematical model of a single microgrid;then combine the benefit function of local microgrid,distributed power supply and energy of energy storage battery,etc.Aiming at the influence of constraints,a micro-grid quick-swap optimization algorithm is proposed.By adjusting the auxiliary polymerization constant and penalty factor,the sub-grid can be quickly plugged and unplugged.Under this model,the local sub-grid can flexibly choose to connect with the microgrid cluster or weaken the participation in the cluster operation,allowing users to have more independent choices and achieve optimal control of energy.The single-phase full-bridge inverter has been widely used because of its simple topology and high reliability.However,the output of the full-bridge inverter usually needs to be connected with a large inductor and capacitor for filtering.Therefore,on the basis of single-phase full-bridge inverter circuit,and this research aims to adopt full-bridge inverter topology based on staggered parallel type,which can reduce the inductance and capacitance volume.Finally,aiming at the energy dispatching problem of microgrid,a micro-grid group fast-swapping optimization scheduling algorithm is proposed to realize the optimal scheduling of micro-grid group energy. |
