一种脉冲强磁场电源的仿真与控制的实现

发布时间：2018-04-08 11:37

本文选题：串联谐振　切入点：F/V　出处：《电子科技大学》2014年硕士论文

【摘要】：近年来,随着分子级别的物质特性研究的不断深入,对磁场的要求越来越高,相应的对电源的要求也越来越高,表现为电流越来越高,底宽越来越大。在国内外,现在普遍存在的问题为电源体积很大,不适合多种场地实验的要求;放电电流小,不能满足多种强磁场研究的需要,研制出电流更高、磁场更强稳定性更好、体积小便于移动的的磁场电源系统的要求越来越迫切。众所周知,电流中的损耗与电流的平方成正比,所以要研制高于国内水平的大电流磁场电源有很大的难度。但与挑战并存的是机遇,对更大电流磁场的研究得到实现后,一定有其良好的市场竞争力,同时也可推动国内相关研究领域的发展。串联谐振充电是一种新型的充电技术,对于电容充电来说此种充电技术有着恒流充电的特性等优点,因此在近些年,LC串联谐振被广泛的应用于各类充电电源中,其可靠性优于其他类型的电源。而在控制方面,可编程逻辑控制器(PLC)的出现,使远程控制及实时监控进入到一个新的技术高度,随着其技术的不断发展,其逐渐可以扩展各种模块以加强其本身的功能,如通信功能不断强大、高速I/O口功能、模拟量输入输出等。这时功能都是对工业流程控制量身订做,对于各类电源来讲是提供了一个良好的监控平台,并通过供应商提供的软件来对工业产品进行方便的控制。此论文旨在研制一种强脉冲磁场电源,符合以下性能要求:1、本论文以LC串联谐振充电为主要的技术路线,对容量为20mF电容在20s内完成充电,充电电压4.5kV(max5kV);利用晶闸管对电容储能进行释放,放电形成底宽50ms,放电电流4kA,利用合适的负载实现5T的脉冲强磁场;2、以S7-200型工业PLC控制方案为可本控触发、遥控触发,并可在触发后一定时间内自动充电;3、通过软件实现电源的多种故障保护功能及电容电压泄放保护功能。4、用软件实现对充电电压的设置和对充电电压的实时采集,即F/V和V/F转换,以及软件实现系统加电流程的控制。论文中对于主要的原理及技术,利用Matlab仿真工具,对脉冲磁场电源原理进行仿真,并对其控制系统进行编程,以实现电源的正常工作及可靠保护。
[Abstract]:In recent years, with the further study of the material properties at molecular level, the demand for magnetic field and the corresponding power supply is becoming higher and higher, which shows that the current is higher and the base width is larger and larger.At home and abroad, the common problems at present are that the power supply is very large, which is not suitable for many kinds of site experiments, the discharge current is small and cannot meet the needs of many kinds of strong magnetic field research, and the current is higher and the magnetic field is stronger and more stable.The requirement of the magnetic field power system, which is small and easy to move, is more and more urgent.As we all know, the loss in the current is proportional to the square of the current, so it is very difficult to develop a high current magnetic field power supply which is higher than the domestic level.But the challenge is the opportunity. After the research on the larger current magnetic field is realized, it must have its good market competitiveness and promote the development of related research fields in China at the same time.Series resonant charging is a new charging technology, which has the advantages of constant current charging for capacitor charging, so it has been widely used in various charging power sources in recent years.Its reliability is superior to other types of power supply.In the aspect of control, the appearance of PLC (Programmable Logic Controller) brings remote control and real-time monitoring to a new level of technology. With the continuous development of its technology, it can gradually expand various modules to strengthen its own functions.For example, communication function is constantly powerful, high speed I / O port function, analog input and output, etc.At this time, the functions are tailor-made to the industrial process control, and it provides a good monitoring platform for all kinds of power supply, and through the software provided by the supplier to facilitate the control of industrial products.The purpose of this paper is to develop a strong pulsed magnetic field power supply, which meets the following performance requirements: 1. In this paper, LC series resonant charging is the main technical route, and the capacity of 20mF capacitor is charged in 20 s.The charging voltage is 4.5kV / m max5kVN, the capacitor energy storage is released by using thyristor, the bottom width of discharge is 50ms, the discharge current is 4kA, and the 5T pulsed strong magnetic field is realized by appropriate load. The S7-200 industrial PLC control scheme is used as the control trigger and the remote control trigger.It can be automatically charged within a certain time after trigger, and can realize various fault protection functions of power supply and capacitor voltage discharge protection by software. The software can also realize the setting of charging voltage and the collection of charging voltage in real time, that is, F/ V and V / F conversion.And software to control the system power flow.In this paper, the principle of pulse magnetic field power supply is simulated by using Matlab simulation tool, and its control system is programmed to realize the normal operation and reliable protection of power supply.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN86

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