[信息与通信]轧钢机变频调速系统.doc

目 录 摘要 ABSTRACT 引言……………………………………………………………………………1 1.1 前言………………………………………………………………………1 1.2 轧钢机变频调速系统研究的现状与存在的问题………………………1 1.3 本文的主要内容…………………………………………………………2 磁场定向矢量控制同步电机的数学模型…………………………………4 同步电机转子的dq轴系的数学模型……………………………………4 2.2 同步电机定子的MT轴系的数学模型…………………………………7 2.3 气隙磁链定向矢量控制同步电机的数学模型…………………………11 大功率电力电子变换器……………………………………………………14 交交变频器基本原理……………………………………………………14 3.2 交交变频器主回路设计…………………………………………………24 5000KW轧钢机变频调速系统设计…………………………………………30 4.1 热连轧主传动系统组成…………………………………………………30 4.2 交交变频器主回路………………………………………………………34 4.3 整流变压器………………………………………………………………36 4.4 交交变频同步电机控制系统……………………………………………37 轧制分析、无功补偿与谐波治理……………………………………………42 转矩、转速及功率分析……………………………………………………42 5.2 无功补偿与谐波治理……………………………………………………46 5.3 轧机机电振动的抑制……………………………………………………49 结论…………………………………………………………………………………52 致谢 参考文献 摘 要 本文对大型热连轧钢机主传动变频调速系统进行了设计，根据大型热连轧钢机主传动具有低速大功率传动、较高的动态响应和过载能力的特点，选择技术应用已经成熟的交交变频同步电机调速作为系统的设计方案，其中同步电机采用磁场定向矢量控制，交交变频调速装置采用大功率晶闸管元件组成多套大功率交交变频器，并对变频调速系统进行调试分析，主要是对轧制过程进行转矩、转速及功率分析，以及进行无功补偿与谐波治理。 关键词 轧钢机 热连轧 矢量控制 交交变频 ABSTRACT This article has carried on the design to the large-scale hot companymill main transmission frequency conversion velocity modulation system, main transmission had the low speed high efficiency transmission according tothe large-scale hot company mill, a higher dynamic response and theoverload capacity characteristic, the choice technology applicationalready the mature junction hands over the frequency conversion synchronous machine velocity modulation to take the system the designproposal, synchronous machine used the magnetic field direction detection vector control, handed over the alternation frequency speeder to use the high efficiency crystal thyratron part to composethe multi- wraps high efficiency junction to hand over the frequency changer, and carried on the debugging analysis to the frequency conversion velocity modulation system, mainly was carries on thetorque, the rotational speed and the power analysis to the rollingprocess, as well as carried on the idle work to co