基于DSP的在线式UPS数字化控制技术

【作者】 许道飞；

【导师】 吴燮华；

【作者基本信息】 浙江大学 ， 电力电子与电力传动， 2003， 硕士

【摘要】 近年来，UPS(Uninterruptible Power Supply)电源系统被越来越广泛的使用，对其性能指标的要求也越来越高。除了主功率拓扑以外，UPS的控制部分对其整体性能的影响也是至关重要的，数字化控制技术是当前UPS研究领域的一个热点。 本文首先介绍在线式UPS的基本原理以及逆变器的SPWM调压方法，研究死区对逆变器输出电压的影响及其补偿方法。在分析单相全桥逆变器数学模型的基础上，比较数字PID控制、无差拍控制、重复控制、模糊控制以及神经网络元控制等多种控制方法的优劣；重点研究UPS逆变器的数字PID控制和重复控制，最后提出一种对硬件设备要求低、鲁棒性好、动态响应快的UPS逆变器控制方案。该方案先对输出电压误差进行PI调节，在此基础上引入相当于输出电压微分的电容电流反馈信号构成双环控制，使逆变器输出电压具有良好的静态特性和动态特性。 本文注重理论与工程实际应用的结合，以数字信号处理芯片TMS320F240为核心完成对一台3kVA在线式UPS的控制，取得了良好的控制效果。更多还原

【Abstract】 Nowadays, with more and more applications of UPS, the requirements for its performance get improved. Except for its main circuit, the control of UPS is very important to achieve perfect performance. The digital control technologies have now become the hotspot on the research of UPS technologies.This dissertation introduces the principle of the on-line UPS, and the SPWM technology for the UPS inverter is also discussed. The effect of blanking time on the output voltage in PWM inverters and the methods to eliminate it is described. The mathematical model of the single-phase full-bridge inverter is mentioned, and then the efficacy of PID control, deadbeat control, repetitive control, fuzzy control together with neural networks control for the UPS inverter is compared. The PID control and repetitive control for the UPS inverter are mainly focused. Finally, a control scheme which requires ordinary hardware, with good robustness and high dynamic response is presented. In this control scheme, the voltage error is processed by PI algorithms first, and then the current of the capacitor which equal to the differential of the voltage is imported to compose a two-loop control. The inverter with the proposed control scheme achieves nice performance.To realize the combination of theory and practice, the control of a 3kVA on-line UPS is well finished with the main processor TMS320F240.更多还原