Research On Hardware-in-the-loop Simulation Of Power Electronics On FPGA

With the development of power electronic technology,the use of power electronic equipment is becoming more and more frequent in the automotive industry,navigation,aerospace industry,and the control system is becoming more and more complex.Generally speaking,the power electronic system is more complex,which has the characteristics of nonlinear and time-varying,so it is difficult to design and develop the power electronic system.Usually,the simulation test is needed to assist the design of the product,which can shorten the development time,reduce the development cost and improve the reliability of the product.Hardware in the loop(HIL)simulation is widely used in the development and design of power electronic systems,such as wind power,solar photovoltaic power generation,new energy vehicles and other fields.This paper mainly focuses on the following parts of the hardware in the loop simulation:Firstly,the research on the current situation of power system simulation at home and abroad,the development of real time power system simulation technology;research on the hardware in the loop simulation technology development and advantages of several industry commonly used hardware in the loop simulation platform: Simulink real time system simulation platform,simulation platform of ADI system,RT-LAB system,dSPACE system simulation platform,simulation platform of RTDS system are introduced in detail.It provides a convenient and quick reference for the researchers to select the appropriate system simulation platform for system design and simulation.Secondly,this paper studies the numerical solution of the ordinary differential equation in the simulation of power electronic system and the construction of the circuit equation.Detailed description of the numerical solution of several ordinary differential equations and the numerical stability are analyzed;and this paper studied the System Generator Field Programmable Gate Array(FPGA)development methods and tools based on power electronics;finally to typical Buck circuit as an example,using the trapezoidal integration method and establish the mathematical model for the simulation of the modified node method,simulation operation and realize the circuit model in FPGA,compared with the model simulation results verify the feasibility of building SimPowerSystems,FPGA power electronic hardware in the loop simulation.Thirdly,based on the current in the Direct Current(DC)transmission in the use and research of Modular Multilevel Converter(MMC)topology is widely used as an example,Thevenin theorem and trapezoidal integration method to establish the mathematical model of equivalent Thevenin MMC sub-module.Use the System Generator modular design tools to achieve the equivalent mathematical model in FPGA,set up a single sub-module and single phase 20 level module in MMC FPGA simulation model,compared with the physical simulation model constructed by SimPowerSystems respectively,verify the correctness of the mathematical model,and the simulation results verify the feasibility of the use of FPGA power electronics the hardware in the loop simulation.