单周期控制PFC技术及其数字化控制研究

发布时间：2018-06-23 03:58

  本文选题：功率因数校正 + 单周期　； 参考：《西安电子科技大学》2014年硕士论文

【摘要】：开关电源是电网与用电设备之间的桥梁,而功率因数校正电路作为所有开关电源的第一级,担负着抑制谐波电流注入电网的重要作用,其性能的优劣直接影响电网的安全和电能的质量。现代开关电源技术正在朝着高频化、模块化和智能化的方向发展,而传统的模拟控制方案由于自身的局限性,已不再能够满足当前的市场需求。因此本文在研究了开关电源原理和结构的基础上,设计了一款输入为电网220V交流电压,输出为直流400V的,由单周期原理控制的有源功率因数校正Boost-APFC电路,并且对单周期控制系统给出了数字化的解决方案。本文对开关电源和功率因数校正的原理进行了阐述,通过对拓扑结构、控制策略和采样算法三个方面的分析,给出了适用于功率因数校正电路的参数方案。利用PSpice、Simulink和SIMPLIS完成了Boost变换器的数学模型建模,仿真结果表明,建模得到的传递函数和实际开关电路具有较高契合度。针对Boost变换器,设计了双环控制的电流环控制系统,利用Sisotool对控制回路进行了频率补偿,对系统的稳定性和响应速度进行了优化。在Boost变换器设计的基础上增加了功率因数校正功能,使用单周期控制策略在PSim中完成了仿真和优化,通过调试,最终使得功率因数值PF达到了99.7%以上,总谐波畸变率THD下降到了5%以下。针对单周期控制策略的特点,设计了适合于DSP/ARM控制的数字化PI模块和数字化采样模块,摒弃了传统的前后台嵌入式系统,基于uC/OSII实时操作系统设计了多任务调度策略,并成功的在以ARM920T为核心的mini2440开发板上进行了验证性实验。
[Abstract]:Switching power supply is a bridge between power grid and power equipment. As the first stage of all switching power supply, power factor correction circuit plays an important role in restraining harmonic current injection into power grid. Its performance directly affects the security of power grid and the quality of power. The modern switching power supply technology is developing towards the direction of high frequency modularization and intelligence while the traditional analog control scheme is no longer able to meet the current market demand due to its own limitations. On the basis of studying the principle and structure of switching power supply, this paper designs an active power factor correction Boost-APFC circuit with 220 V AC voltage and 400V DC output, which is controlled by single cycle principle. The digital solution of single cycle control system is also given. In this paper, the principle of switching power supply and power factor correction is described. Through the analysis of topology, control strategy and sampling algorithm, a parameter scheme suitable for power factor correction circuit is given. The mathematical model modeling of boost converter is completed by using PSpice Simulink and SIMPLIS. The simulation results show that the proposed transfer function has a high consistency with the actual switching circuit. A two-loop current loop control system is designed for boost converter. Sisotool is used to compensate the frequency of the control loop. The stability and response speed of the system are optimized. Based on the design of boost converter, the power factor correction function is added, and the simulation and optimization of PSim with single cycle control strategy are completed. Through debugging, the power factor value PF reaches more than 99.7%. The total harmonic distortion rate (THD) decreased to less than 5%. According to the characteristics of single cycle control strategy, a digital Pi module and a digital sampling module are designed for DSP / arm control. The traditional embedded system is abandoned, and a multi-task scheduling strategy based on UC / OSII real-time operating system is designed. The verification experiments are successfully carried out on the mini2440 development board with ARM920T as the core.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46

【共引文献】

中国期刊全文数据库 前1条

1 王明霞;都洪基;;基于IR1150S芯片的Boost PFC变换器分析与设计[J];电源世界;2014年11期

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本文编号：2055656