2007年度CPA全国统一考试上海考区报名简章
2007-04-18
更新时间:2005-12-20 11:53:25作者:未知
关键词 功率因数校正;可逆变流器;滑模变结构控制;空间矢量;数字信号处理器
Abstract
Development survey of control strategy of voltage type reversible converter is summarized systematically. Control strategy is studied in detail. Direct current d-q change and sliding mode controls are regarded as control strategy of this paper on the basis of comparing of advantages and disadvantages varieties of control strategy.
Mathematics mode is set forth detailedly, including; current general mathematics mode; d-q change large signal mathematics model and d-q change small signal mathematics model. The system current loop is established according to d-q change large signal mathematics model. The voltage loop and its SMC are designed according to d-q change small signal mathematics model.
Space vector PWM is regarded as switch control strategy .Its essential principle is set forth detailedly and is simulated based on MATLAB. Voltage loop adopts variable structure control with sliding mode in order to improve with regard to conventional PID control, which is sensitive to system parameter. Close loop system simulation of SPWM and SVPWM is completed with neglecting high harmonics and without neglecting high harmonics based on MATLAB.
Because calculation speed of single chip microprocessor is slow and it realizes timing control poorly, digital signal processor TMS320F240 of TI Company is adopted to improve the calculation speed.
Flowchart of system software is designed according to control strategy of this paper. The double close loop program of current and voltage is complied. SVPWM wave of switch frequency (900Hz) is emitted based on TMS320F240.Open loop experimentation and close experimentation is completed according to theory analysis and practice process, validating feasibility of control strategy.
This paper obtains the sustainment of science and technology fund of committee of education in province HeBei and is the follow-up task of nature science fund of country and has the important value of economy and the guidance significance of theory.
Keywords power factor correction; reversible converter; variable structure control with sliding mode; space vector; digital signal processor
目 录
摘要……………………………………………………………………………Ⅰ
Abstract……………………………………………………………………Ⅱ
第1章 绪论…………………………………………………………………1
1.1 功率因数校正技术的发展概况………………………………………1
1.1.1 单个三相PFC电路………………………………………………2
1.1.2 电流断续状态下三相单开关变换器……………………………3
1.1.3 电流断续状态下的三相升压变换器……………………………4
1.1.4 电流连续状态下三相升压变换器………………………………4
1.1.5 三相降压整流器…………………………………………………5
1.2 电压型可逆变流器的开关控制策略…………………………………5
1.3 电压型可逆变流器的控制方案………………………………………6
1.3.1 间接电流控制……………………………………………………6
1.3.2 直接电流控制……………………………………………………7
1.4 可逆变流器控制策略的新发展………………………………………9
1.4.1 单周控制…………………………………………………………10
1.4.2 占空比控制………………………………………………………10
1.4.3 基于Lyapunov非线性大信号方法控制………………………10
1.4.4 神经网络和模糊逻辑控制………………………………………10
1.4.5 双电流控制………………………………………………………11
1.4.6 输出直流电压的优化前馈补偿控制……………………………11
1.5 本课题工作…………………………………………………………11
第2章 可逆变流器控制方案及数学模型…………………………13
2.1 可逆变流器数学模型概述…………………………………………13
2.2 系统数学模型的建立………………………………………………13
2.2.1 系统通用数学模型的建立………………………………………14
2.2.2 系统d-q数学模型的建立………………………………………16
2.2.3 系统小信号数学模型……………………………………………18
2.3 系统的控制方案……………………………………………………21
2.4 变流器电流环的设计………………………………………………22
2.5 滑模变结构控制理论………………………………………………25
2.5.1 滑模变结构控制的基本问题……………………………………26
2.5.2 滑模变结构控制的基本策略……………………………………26
2.5.3 滑模变结构控制系统的动态品质………………………………27
2.6 滑模控制器及电压环的设计………………………………………28
2.6.1 广义控制对象的确定……………………………………………28
2.6.2 滑模控制器的改进………………………………………………32
2.7 本章小结……………………………………………………………36
第3章 系统仿真研究……………………………………………………37
3.1 空间矢量PWM(SVPWM)的基本原理……………………………37
3.2 空间矢量的工作模式和时间的计算………………………………38
3.3 空间矢量调制比及其对系统的影响………………………………42
3.4 空间矢量的MATLAB仿真………………………………………43
3.5 控制系统仿真研究………………………………………………45
3.5.1 不忽略高次谐波下的总系统SPWM仿真……………………49
3.5.2 不忽略高次谐波下的总系统空间矢量仿真……………………50
3.6 本章小结……………………………………………………………52
第4章 基于DSP软件实现……………………………………………53
4.1 TMS320F240的结构与汇编原理……………………………………53
4.2 TMS320F240的中断结构……………………………………………54
4.3 TMS320F240的定点运算……………………………………………55
4.4 系统控制的硬件和软件设计………………………………………56
4.4.1 系统硬件设计……………………………………………………57
4.4.2 系统软件设计……………………………………………………58
4.5 本章小结……………………………………………………………60
第5章 系统实验…………………………………………………………61
5.1 开环实验……………………………………………………………62
5.2 闭环实验……………………………………………………………64
5.2.1 电流闭环实验……………………………………………………64
5.2.2 电压闭环实验……………………………………………………67
5.3 实验注意事项………………………………………………………69
5.4 本章小结……………………………………………………………69
结论……………………………………………………………………………71
参考文献………………………………………………………………………72
攻读硕士学位期间所发表的论文……………………………………………77
致谢……………………………………………………………………………78