【作者】 陈大卓；

【导师】 姜建国；

【作者基本信息】 上海交通大学 ， 电力电子与电力传动， 2009， 硕士

【摘要】 矿井提升机是矿山的重要运输设备,它的电气传动装置一直是各国电气传动领域的一个研究热点。目前,我国的矿井提升机的电力拖动方案主要为交流绕线式异步电机转子串电阻调速、晶闸管供电的直流电动机调速、晶闸管交—交变频方案等。针对矿井提升机的四象限运行,高可靠性,调速范围宽等要求,本文提出了将双PWM交—直—交变频调速系统运用于矿井提升机上的研究课题。本课题主要分为整流与逆变两大部分。其中整流侧采用PWM整流器,逆变侧采用PWM逆变的异步电机矢量控制。本文首先给出了异步电机在任意坐标系下的数学模型,并对其进行了标幺化。对于异步电机的矢量控制,详细分析了直接矢量控制方式以及间接矢量控制各自的优缺点,并采用了一种基于空间矢量调制(SVPWM)的改进间接矢量控制策略。其次分析了三相电压型PWM整流器(VSR)的工作原理,建立了三相VSR的一般数学模型与同步旋转坐标系下的模型。给出了PWM整流器的控制策略,该策略为按电网电压定向的矢量控制策略,电压外环电流内环的双闭环结构,引入了前馈解耦控制,能对有功和无功功率独立控制。再次给出了系统的总体结构,并针对其中每个部分进行了设计。包括主电路中电感,电容,功率器件的选型。控制器采用TMS320F2812 DSP,其强大的性能完全能够满足本系统的要求。设计了检测调理电路,包括电压,电流,转速的检测与调理。设计了光纤隔离驱动电路,采用2SD315A作为驱动芯片。设计了系统的硬件保护。编制了系统控制软件,包括转速检测,A/D变换,数字PI,SVPWM生成等子程序。最后使用Matlab/Simulink对整个系统进行了仿真,验证了控制策略的有效性。制作了实验样机,设计功率为15KW,通过实际实验,证实了双PWM变频调速系统能够实现单位功率因数,能量双向流动,四象限运行。具有对电网谐波污染小,动态性能好,调速范围大的特性,满足了设计要求,对我国矿井提升机调速系统的改进具有一定的的参考价值。更多还原

【Abstract】 The mine hoist is an important transport equipment during coal mine producing. Its electric driving and control devices are always the research focus in the electric driving field. At present, in our country the electric driving schemes applied to the mine hoist are rotor in series with resistor adjustable speed system, DC motor V-M reversible adjustable speed system, vector control system with thyristor AC-AC frequency conversion, etc. This paper proposes a research issue which applies dual-PWM AC-DC-AC frequency conversion scheme to the mine hoist regarding that the hoist requires high reliability, four-phase operation and wide range of adjustable speed. This research issue can be divided into rectification , which using PWM rectifier, and inverter, which using AC motor vector control.Firstly, the paper gives the mathematical model of asynchronous machine under arbitrary reference frames and the per-unit model is generalized. An improved indirect vector control scheme based on SVPWM has been proposed by combining direct and indirect vector control, whose merits and defects have been analyzed in details.Secondly, the analysis of working principle of three-phase voltage source PWM rectifier (VSR) system is given. The mathematical model of three-phase VSR is established in three-phase static and synchronous rotational reference frame. The control strategy of three-phase VSR is voltage-oriented vector control method based on dual-close-loop control using current inner loop and voltage outer loop. The independent control of active power and reactive power is obtained through the feed-forward decoupling method.Thirdly, the overall structure of the dual-PWM system is given. Each part of the system is designed. The main circuit includes choosing the inductance, capacitance and power switching device. The control device uses TMS320F2812 DSP, which is powerful enough to fulfill the requirements of the system. Sample and conditon circuit is designed, which is used to detect AC and DC voltages, AC currents and the machine rotor speed. The optical fiber isolated driving circuit is built, which chooses 2SD315A as the driving chip. The hardware protection circuit is also got designed. The system control program is composed, which includes rotor speed test, the digital PI regulator, A/D, SVPWM algorithm.Lastly, the dual-PWM frequency conversion system is simulated based on Matlab/Simulink, which verifies that the control system is correct and effective. The prototype of the experimental system has been built, power rating of which is 15KW. The system is proved to be capable of running in unity power factor, bi-direction powerflow and four-phase operation according to the experimental result. The system has the features of very small harmonic current, good system dynamic performance and wide speed range, which meets the design requirements. This research issue has some reference value to the improvement of mine hoister for our country.更多还原