【摘要】：常規(guī)重復控制提供了一種精確波形控制方案,可以實現(xiàn)任何已知整數(shù)周期信號的零穩(wěn)態(tài)誤差跟蹤,以補償由參量變化特別是非線性負載引起的諧波失真。其中,重復控制系統(tǒng)要求外部控制信號周期必須是采樣周期的整數(shù)倍,然而,它不總是滿足于實際應(yīng)用。當延遲指數(shù)項出現(xiàn)分數(shù)階時,常規(guī)重復控制不能精確地跟蹤控制周期信號,引起電力電子器件控制性能的顯著下降。為此,本文采用內(nèi)嵌拉格朗日插值算法的低通濾波器逼近分數(shù)階指數(shù),提出了基于內(nèi)模原理的分數(shù)階相位補償重復控制技術(shù)。在固定采樣頻率下,所述分數(shù)階相位補償重復控制為滯后非整數(shù)項提供了解決方案。論文以電壓型單相全橋恒壓恒頻PWM逆變器的波形控制為研究平臺,首先建立和分析逆變器狀態(tài)空間方程,給出了濾波電路參量的選擇條件。然后闡述線性反饋控制的控制原理,論述常規(guī)重復控制原理,并分析其系統(tǒng)特性,以此為基礎(chǔ),引入分數(shù)階相位補償重復控制器,繼而詳細分析分數(shù)階相位補償重復控制系統(tǒng)的設(shè)計原理及系統(tǒng)特性。為了驗證所提分數(shù)階相位補償重復控制器的精準性和優(yōu)越性,在仿真環(huán)境中分別進行了線性反饋控制系統(tǒng)、常規(guī)重復控制系統(tǒng)和所提控制系統(tǒng)的對比仿真實驗。此外,搭建了以DSP為控制系統(tǒng)的單相PWM逆變器實驗平臺,并介紹包含采樣電路、驅(qū)動電路等硬件電路的選取分析,同時分析包含主程序、ADC采樣、SPWM產(chǎn)生及控制器程序的軟件設(shè)計。最后,實驗波形和數(shù)據(jù)驗證了分數(shù)階相位補償重復控制器的精準性和優(yōu)越性。
[Abstract]:Conventional repetitive control provides an accurate waveform control scheme which can track the zero steady-state error of any known integer periodic signal to compensate the harmonic distortion caused by the variation of parameters especially the nonlinear load. The repetitive control system requires that the period of the external control signal must be an integer multiple of the sampling period, but it is not always satisfied with the practical application. When the delay index term appears fractional order, the conventional repetitive control can not accurately track the control periodic signal, which results in the significant degradation of the control performance of power electronic devices. In this paper, the low-pass filter with embedded Lagrangian interpolation algorithm is used to approximate the fractional exponent, and a fractional phase compensated repetitive control technique based on the internal model principle is proposed. At a fixed sampling frequency, the fractional phase compensated repetitive control provides a solution for the delay non-integer term. Based on the waveform control of the voltage-type single-phase full-bridge constant-voltage and constant-frequency PWM inverter, the state space equation of the inverter is established and analyzed firstly, and the selection conditions of the filter circuit parameters are given. Then the control principle of linear feedback control is expounded, and the principle of conventional repetitive control is discussed, and the characteristics of the system are analyzed. On the basis of this, fractional phase compensated repetitive controller is introduced. Then the design principle and characteristics of fractional phase compensated repetitive control system are analyzed in detail. In order to verify the precision and superiority of the proposed fractional phase compensated repetitive controller, the comparative simulation experiments of the linear feedback control system, the conventional repetitive control system and the proposed control system are carried out in the simulation environment. In addition, the experiment platform of single-phase PWM inverter with DSP as control system is built, and the selection and analysis of hardware circuits including sampling circuit, driving circuit and so on are introduced. At the same time, the main program, ADC sampling, and so on are analyzed. SPWM generation and software design of controller program. Finally, the experimental waveform and data verify the precision and superiority of the fractional phase compensation repetitive controller.
【學位授予單位】：安徽工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM464

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