可控硅中频电源启动过程建模与控制参数优化

发布时间：2018-01-02 21:30

本文关键词：可控硅中频电源启动过程建模与控制参数优化　出处：《重庆大学》2016年硕士论文　论文类型：学位论文

【摘要】：并联谐振型可控硅中频电源在锻造行业中有着重要应用,但启动问题一直困扰其性能的提升,为了解决在复杂工况下电源的启动成功率低与启动性能不够优越的问题,文中基于电源的启动过程与负载回路特性分析,建立了可控硅中频电源的启动过程模型,并提出了启动控制参数的优化方法。在课题研究中,主要完成了以下工作:基于对可控硅中频电源启动过程的剖析,指出了并联谐振型电源难于启动的原因,针对性地提出了几种可能增强启动能力的措施。利用解析法推导了感应器等效参数的计算公式,同时分析了等效负载回路特性,建立了可控硅中频电源启动过程的数学模型。在MATLAB/Simulink环境中,对所建数学模型进行了开环与闭环系统的阶跃响应实验,验证了所建立数学模型的正确性。基于中频电源的数学模型,导出了电源启动控制参数的选取条件以得到较好的启动性能。针对不同负载的启动情况,在整流触发角选取策略方面,进一步推导出了不同负载衰减因子下电源启动的整流触发角范围,并最终给出了电源启动控制的步骤。基于MATLAB/Simulink的仿真平台,建立了适合具有初始能量的中频电源启动仿真模型,在优选后的控制参数下与不同衰减因子时整流角选取条件下,分别做了启动仿真实验,验证了启动控制参数优选条件与启动策略的正确性。仿真实验结果表明,文中提出的中频电源数学模型与启动控制参数优选策略是合理的,并较负载串并联启动与IGBT辅助桥启动方法具有更强的启动能力。所建立的电源系统数学模型,对研究中频电源的后续问题,如电源控制、电能质量改善等,具有一定的参考价值。
[Abstract]:Parallel resonant thyristor intermediate frequency power supply has an important application in the forging industry, but the startup problem has been puzzling its performance improvement. In order to solve the problem of low success rate and insufficient performance of power supply under complex operating conditions, this paper analyzes the characteristics of power supply starting process and load loop. The start-up process model of thyristor intermediate frequency power supply is established, and the optimization method of startup control parameters is proposed. In the research of the subject, the following work is accomplished: based on the analysis of the start-up process of the thyristor intermediate frequency power supply. This paper points out the reason why the parallel resonant power supply is difficult to start, and puts forward several measures to enhance the starting ability. The formula of equivalent parameters of inductor is deduced by analytic method. At the same time, the characteristics of equivalent load loop are analyzed, and the mathematical model of thyristor intermediate frequency power supply start-up process is established. In MATLAB/Simulink environment. The step response experiments of the open loop and closed loop systems are carried out to verify the correctness of the established mathematical model, which is based on the mathematical model of intermediate frequency power supply. The selection conditions of power supply startup control parameters are derived to obtain better startup performance. For different load start-up conditions, the selection strategy of rectifier trigger angle is presented. Furthermore, the range of rectifier trigger angle under different load attenuation factors is deduced, and finally, the steps of power start control are given. The simulation platform based on MATLAB/Simulink is presented. The start-up simulation model of intermediate frequency power supply with initial energy is established. Under the optimal control parameters and the different attenuation factors, the starting simulation experiments are done respectively under the condition of rectifying angle selection. The simulation results show that the mathematical model of if power supply and the optimization strategy of startup control parameters are reasonable. The mathematical model of the power supply system is more powerful than the load series-parallel startup and IGBT auxiliary bridge starting method. The mathematical model of the power supply system is used to study the follow-up problems of if power supply, such as power supply control. The improvement of power quality has certain reference value.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN34

【参考文献】