Research On Semi-physical Real-time Simulation Model Of Synchronous Generator Based On DSP

Synchronous generator excitation system is an important part of the power system.Its performance directly determines the reliability and stability of the power system.However,the control system is so complex that the determination of transfer function and equipment parameters needs a lot of mathematical derivation and analysis of actual working conditions.At present,the parameters of excitation regulator are finally tuned on the real unit,which often has a greater impact on the real unit with a certain risk.Moreover,some tests,such as short-circuit fault test and system stability test,can not be realized in practice.Therefore,this paper presents a hardware-in-the-loop simulation method to verify the correctness of the actual excitation device control algorithm and the perfection of the protection function.In the semi-physical simulation process,the excitation regulator in the power system is a real object,and the rest units are virtual mathematical models.As the core of mechanical energy conversion to electric energy,synchronous generator is an indispensable component of power system.The accuracy of its mathematical model is of great significance for analyzing the dynamic characteristics of the entire power system.The mathematical modeling of synchronous generators has been studied in this paper,which focuses on the mathematical model and simulation model of the entire power system including synchronous generators,prime movers and governors.In order to correctly simulate the working conditions of large synchronous generators,this paper firstly analyzes the most detailed ninth-order mathematical model of synchronous generators.In the mathematical modeling process,starting from the original equation of the synchronous generator,the equation in the dq0 coordinate system is derived.By analyzing the selection rules of the standard value system,the base value is appropriately selected and the standard of the equation is completed.We can get a very simple mathematical model.Then,by analyzing the relationship between the mathematical model and the practical parameters,the parameters of the simulation model are established.Secondly,in order to improve the power system and verify the correctness of synchronous generator model,simulation models of excitation regulator,prime mover,governor and load should be established to simulate the whole power system.Among them,the typical excitation system model is used to simulate the excitation regulator,and the power-frequency electro-hydraulic governor model is used to simulate the prime mover and governor.The load is a single machine-infinite power grid system with double-loop power supply.Finally,a hardware-in-the-loop real-time simulation system experiment platform based on TMS320C6657 DSP is built.The simulation model is converted into embedded C code by RTW tool in MATLAB/Simulink,and the code optimization scheme is given.After compiling and debugging the software algorithm of the whole simulation system,it is downloaded to the DSP,and the accuracy of the mathematical model of synchronous generator is verified by relevant experiments using this platform.