毕业设计（论文）-三闭环调速系统的matlab计算算及仿真.doc

闭环直流调速系统的matlab的计算及仿真 摘要：直流电动机因其良好的调速性能在电力拖动中得到广泛应用，因此在今后相当长的一段时期内直流调速和交流调速并存，未来直流调速系统还将获得更大的发展并发挥重要的作用。直流电动机电流、转速双闭环调速系统存在当转速上升时，电流变化率高，使电动机换向条件恶化的问题，而三环调速系统是在电流、转速双闭环直流控制系统中，再加上一个电流变化率内环，在众多的控制方式中，三环调速系统是性能最佳的控制方式。本文对直流电动机三闭环调速系统做了仿真分析，结果表明它具有更好的整体性能。 本文在分析三闭环直流调速系统原理基础上，根据系统的动、静态性能指标采用工程设计方法设计调节器参数，并运用Matlab 的Simulink 和Power System 工具箱、面向系统电气原理结构现了转速电流三闭环直流调速系统的建模与仿真；重点介绍了电流变化率环建模、转速环和电流环等参数的设置，给出了直流可逆调速系统的仿真模型和结果，仿真结果验证了仿真模型图的仿真方法，实及参数设置的正确性，表明电流变化率得到抑制，同时又能保持允许的最大变化率，使整个电流波形更接近于理想波形。 关键词：直流电动机,三闭环调速系统,参数设置,MATLAB,系统仿真 Loop DC speed control system matlab calculation and simulation Abstract: DC motor speed control because of its good performance in electric drive has beenwidely used, so in the future for a long period of time, AC variable speed DC drive and coexistence, the future DC speed control system will achieve greater development and play an important role. DC motor current, speed dual-loop speed control system exists when the speed increases, the current change rate, the motor commutation condition worsening problem, and tricyclic speed control system is current, speed Double Loop DC control system, coupled with current rate of change on an inner ring, in many control mode, the ring system is the best performance speed control mode. In this paper, three closed-loop DC motor speed control system to do a simulation analysis, the results show that it has better overall performance. This paper analyzes the three principles of the closed-loop DC speed control system based on the system dynamic and static performance indicators engineering design methods using the control parameters, and the use of Matlab Simulink and Power System Toolbox, system-oriented electrical schematic diagram of the simulation method to achieve a speed of current three-Loop DC speed control system modeling and simulation; focuses on the current rate of change modeling loop, speed loop and current loop parameters such settings, gives the DC SR system simulat