基于DSP风机变频调速系统设计.docxVIP

基于DSP风机变频调速系统设计摘要本文分析了变频器的工作原理和异步电机各种控制策略，根据系统设计要求，选用了先进的SVPWM技术，该技术控制模型简单，便于微处理器实时处理，能够减少逆变器输出电流的谐波，降低转矩脉动，提高电压利用率。该变频调速系统以TI公司推出的电机专用微处理器TMs320LF2407ADsP为控制核心，其内部集成的电机控制功能模块使得外围电路的设计大大减少；以智能功率模块(IPM)为主功率器件，其内置的各种保护电路提高了系统的可靠性；对主电路、控制电路、保护电路、检测电路和输入输出电路进行优化设计；使用汇编语言对软件部分进行编写，语法简单、可靠性好、执行效率高；分析了系统软硬件干扰问题并进行了抗干扰设计。死区是变频设计中必须解决的问题，本文分析了功率因数角、载波频率、死区时间、调制比与死区效应的关系，提出了一种新型的软硬件结合的死区补偿方法，该方法硬件成本低，实时性高，有效改善了死区引起的电流畸变。关键词：空间矢量脉宽调制；死区补偿；数字信号处理器；变频器The Research on Voriable Frequency Technology of BlowerVoriable-speed System Based on DSPAbstractThe workprinciple of inverter is controlled several typical AC control strategies are analyzes and compared in this paper．SVPWM is used because of its excellent performance．Ithas simple control model and high voltage utilization，and call be controlled easily by DSP，andcan reduce the current harmonic waves and torque ripples．TMS320LF2407A DSP with integrate modules for motor control developed by TI Co．is the core controller of this system，which reduces the periphery circuit greatly．The built-in protective circuits of IPM make thesystem more stable．The hardware structure mainly includes main circuit，control circuit，protect circuit and input and output circuit．The software system uses assemble 1anguagecompile the whole program．Moreover，some measures are adopt to reduce the distortion bothhardware and software．The effects of Dead-time must be settled in the design of inverter．This paper analyzesthe relationship between power factor-angle，carrier-frequency modulate ration and dead-timedistortion．A new dead-time compensation method on base of the programmable dead-timecontrol function of TMS320LF2407A is and proposed．This method realizes the combinationof the software and hardware，and has low cost and highly real-time capability and correctscurrent distortion effectively．Key Words：SVPWM；Dead-time compensation；DSP；Inverter目录摘要IAbstractII1绪论11．1交流变频调速技术的发展11．1．1电力电子技术的发展11．1．2 PWM技术及其发展11．1．3交流调速的控制方法21．1．4数字控制技术的应用21．2 国内外研究现状及发展趋势31．3 课题的研究方法