全晓明,申群太

摘 要:随着高性能数字信号处理器的广泛应用,传统模拟控制的逆变技术被数字化电源取代已成为必然趋势。逆变电源因非线性负载等因素引起的干扰,采用常规控制难以获得理想的控制效果。提出一种基于DSP实现的PI控制和无差拍控制方法相结合的数字双闭环控制方法。逆变器控制电路的电流内环采用优化了的数字PI控制方法;电压外环采用干扰预测型无差拍控制方法。该方案将无差拍控制的瞬时响应快,精度高和PI控制简单,参数易整定,鲁棒性好等优点相结合,能够得到更优的控制效果。最后的仿真试验表明,采用数字双闭环控制方法的逆变器具有输出波形好,响应快和负载适应能力强等优点。

关键词:逆变器;双闭环控制;无差拍控制;DSP

中图分类号:TP274文献标识码:A

文章编号:1004-373X(2009)12-189-03

Research of Deadbeat Control Inverter Based on DSP

QUAN Xiaoming,SHEN Quntai

(School of Information Science and Engineering,Central South University,Changsha,410083,China)

Abstract:With the wide use of high-performance digital signal processor,it is a natural trend that the traditional analog control of the inverter can be replaced by digital technology.Because the nonlinear loads cause the interference,inverter is hard to receive ideal control.This paper introduces a control method based on PI control strategy and non-deadbeat control method:Inverter control circuit of the current inner loop choose the optimized digital PI control methods,the voltage loop choose the no deadbeat control methods.This method combines the advantages of PI control and non-deadbeat control.Deadbeat control has good performance at transient state.And PI control is simple,easy parameter setting and robust.Finally,the simulation and test figures show that double-loop control method of the inverter receives a lot of advantage such as output waveform with a good,fast response,and better capacity adapt to the different loads.

Keywords:inverter;double-loop control;deadbeat control;DSP

0 引 言

随着高性能DSP控制器的出现,采用数字化控制的UPS电源已成为现在研究的热点[1]。基于DSP实现的数字双闭环控制能有效提高电源系统的抗干扰能力,降低噪声,提高效率和可靠性,进一步有利于电源的智能化管理、远程维护和诊断。在逆变器的多种控制策略中,重复控制技术能有效消除非线性负载和干扰引起的波形畸变;滑模变结构控制方法能使系统运行于一种滑动模态,能保证系统的鲁棒性;模糊控制和神经网络控制等智能控制不依赖控制对象的数学模型,适应于非线性系统;无差拍控制能够瞬时控制电压,对负载有很强的适应能力,有输出总谐波畸变少,损耗少等优点;PID控制简单,并具有好的可靠性;新型数字化PID控制更能取得满意的控制效果。……