基于DSP控制的变频电源设计

发布时间：2018-05-09 00:28

本文选题：变频电源 + APFC　；参考：《西安电子科技大学》2014年硕士论文

【摘要】：变频电源要有较高的稳态性能和较快的动态响应能力,数字化控制技术可以有效满足该要求。以实际需求为背景,本文设计了一台以DSP为控制核心的,输入为单相工频交流电,输出电压和频率可调的变频电源。深入研究了变频电源的相关理论,分析了变频电源基本原理,正弦脉宽调制技术,死区效应及补偿方法,数字化PID控制技术等,依据工程实际需求,确定了系统性能指标,给出了变频电源系统结构设计方案。主电路选用电压型交直交结构,并通过电路参数的优化设计实现了对开关管耐压要求低,输出电压脉动小的基本要求;为提高输入端功率因数,减小电流谐波,整流电路采用有源功率因数校正技术,达到稳定输出电压,输入端电流接近正弦波的作用;针对基于DSP控制的单相全桥逆变电路,采用数字化控制策略,将SPWM波形生成、AD采样和PID调节的控制算法完全数字化,实现变频电源的灵活控制,提高系统整体动态性能。使用Saber和MATLAB/Simulink软件对APFC电路和逆变电路进行建模仿真,验证了系统设计方案的正确性和有效性。电路仿真结果表明,输入电流波形与输入电压波形跟随好,功率因数到达0.97,满足系统要求,整流输出电压稳定在400V,逆变电路实现系统变频变压功能。
[Abstract]:The frequency conversion power supply must have high steady performance and fast dynamic response ability, digital control technology can meet this requirement effectively. Under the background of actual demand, this paper designs a variable frequency power supply with DSP as the control core, single phase power frequency alternating current and adjustable output voltage and frequency. This paper deeply studies the related theory of frequency conversion power supply, analyzes the basic principle of frequency conversion power supply, sinusoidal pulse width modulation technology, dead-time effect and compensation method, digital PID control technology and so on. According to the actual requirements of engineering, the system performance index is determined. The structure design scheme of frequency conversion power supply system is given. The main circuit adopts the voltage type AC / DC structure and realizes the basic requirements of low voltage resistance and low output voltage pulsation through the optimization design of circuit parameters, in order to improve the input power factor and reduce the current harmonics, The rectifier uses active power factor correction (APFC) technology to stabilize the output voltage, and the input current is close to sine wave, and the digital control strategy is adopted for the single-phase full-bridge inverter circuit based on DSP control. The control algorithm of SPWM waveform generation AD sampling and PID regulation is completely digitized to realize the flexible control of frequency conversion power supply and to improve the overall dynamic performance of the system. Saber and MATLAB/Simulink software are used to model and simulate the APFC circuit and the inverter circuit. The correctness and validity of the system design scheme are verified. The circuit simulation results show that the input current waveform and the input voltage waveform follow well, the power factor reaches 0.97, which meets the system requirements, and the rectifier output voltage is stable at 400V. The inverter circuit realizes the variable frequency voltage function of the system.
【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

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