一种数字控制交交变频的起动技术研究  

Research on starting technology of digital AC frequency converter

作　　者：杨东磊 解存福 赵建阳 Yang Donglei;Xie Cunfu;Zhao Jianyang(North China Municipal Engineering Design Research&Institute,Tianjin 300000;China Energy Engineering Group Tianjin Electric Power Design Institute,Tianjin 300400)

机构地区：[1]中国市政工程华北设计研究总院有限公司,天津300000 [2]中国能源建设集团天津电力设计院有限公司,天津300400

出　　处：《电气技术》2020年第2期60-64,共5页Electrical Engineering

摘　　要：交直交变频技术在传动领域取得了丰硕的成果,但是可关断功率器件的性能限制了重载起动的能力。本文设计了基于数字控制技术的交交变频器,来解决矿用大功率刮板运输机的起动力矩需求大、易堵转、调速困难等问题。文中介绍变频器主电路结构形式和数字控制器组成,核心控制器CPU采用基于直接数字式频率合成器的通信采样原理和数字锁相环设计,实现了余弦交点法数字化,主从式三相独立控制发挥了机械结构柔性电控的优越性能。最后根据Simulink环境下的仿真结果,验证了刮板运输机在不同重载情况下都可以顺利起动。AC/DC/AC frequency converter technology has achieved fruitful results in the field of transmission.However,the performance of power-off device limites the ability to start at heavy loads.This paper designs an AC-AC converter based on digital control technology to solve the problems of large demand for starting moment,easy blocking and difficult speed regulation of high-power scraper conveyor in mine.This paper introduces the main circuit structure of the converter and the composition of the digital controller.The core controller CPU adopts the communication sampling principle based on DDS and the design of digital phase-locked loop,realizes the digitization of cosine intersection method.The master-slave three-phase independent control gives full play to the superior performance of the flexible electronic control of the mechanical structure.Finally,according to the simulation results in the simulink environment,it is verified that the scraper conveyor can start smoothly under different heavy load conditions.

关 键 词：重载起动 数字锁相环 主从式独立控制 机械结构柔性电控 

分 类 号：TD634.2[矿业工程—矿山机电] TM921.51[电气工程—电力电子与电力传动]