本文選題：逆變器　切入點：比例諧振　出處：《陜西科技大學》2017年碩士論文　論文類型：學位論文

【摘要】：傳統(tǒng)三相逆變器的基本控制思想是將三相靜止坐標系上的信號經(jīng)過兩次坐標轉(zhuǎn)換后,把交流信號等效成直流信號,用比例積分控制器進行控制。該控制策略雖然能夠達到一定的控制效果,但對逆變器輸出波形的諧波抑制效果有限。對于新的控制器,如無差拍控制,重復控制以及預測控制等,在實際應(yīng)用中各有優(yōu)缺點。本文以抑制電壓諧波為目的,對三相LC型獨立逆變器的雙閉環(huán)控制策略進行了研究,主要研究內(nèi)容如下:(1)比例諧振控制器的深入研究。通過增加截止頻率構(gòu)成準比例諧振控制器,防止控制器離散化過程導致跟蹤頻率偏移,從而在基波頻率的增益變小。逆變器采用準比例諧振控制器能夠得到較好的輸出特性,然而準比例諧振控制器對其他頻率點的諧波抑制效果不理想。通過增加準諧振控制器構(gòu)成多重準比例諧振控制器可對5次和7次諧波進行抑制。(2)比例復數(shù)積分控制器的深入研究。根據(jù)經(jīng)典控制理論中所述的系統(tǒng)輸出跟蹤輸入的原理,通過交流量穩(wěn)態(tài)誤差的求解方法,從線性系統(tǒng)疊加原理和頻域分析的角度出發(fā),詳細闡述了比例復數(shù)積分控制器在基波頻率處有無窮大增益的原理。在比例復數(shù)積分控制器的基礎(chǔ)上,通過增加截止頻率和積分環(huán)節(jié),提出了準比例復數(shù)積分加積分的控制器。(3)通過MATLAB/simulink軟件搭建了軟件仿真模型,分別對雙閉環(huán)比例積分控制策略、雙閉環(huán)多重準比例諧振控制策略、雙閉環(huán)準比例復數(shù)積分控制策略以及雙閉環(huán)準比例復數(shù)積分加積分的控制策略進行了仿真研究。(4)實驗平臺的搭建與實驗。在實驗室TLI-X00模塊化電力電子平臺的基礎(chǔ)上,設(shè)計并制作了一個LC濾波器,用于濾波和實時采集濾波器的電容電壓及電感電流的值。軟件實現(xiàn)了空間矢量脈寬調(diào)制過程。配置了TMS320F28335的e PWM模塊寄存器和ADC采樣模塊寄存器,從而產(chǎn)生PWM驅(qū)動信號和實現(xiàn)采樣功能。通過搭建的逆變實驗平臺對雙閉環(huán)多重準比例諧振控制策略和雙閉環(huán)準比例復數(shù)積分加積分的控制策略進行了實驗驗證。仿真和實驗結(jié)果表明,雙閉環(huán)準比例復數(shù)積分加積分的控制策略相比于研究的其余三種控制策略既能有效抑制諧波,又能有效抑制負載突變導致的電流擾動,達到良好的控制效果。
[Abstract]:The basic control idea of the traditional three-phase inverter is to convert the signals in the three-phase stationary coordinate system into DC signals after two coordinate conversions. Although the control strategy can achieve certain control effect, the harmonic suppression effect of inverter output waveform is limited. For the new controller, for example, no beat control, Repetitive control and predictive control have their merits and demerits in practical application. In this paper, the double closed-loop control strategy of three-phase LC independent inverter is studied in order to suppress voltage harmonics. The main research contents are as follows: (1) A further study of the proportional resonance controller. By increasing the cutoff frequency, the quasi-proportional resonant controller is constructed to prevent the discrete process of the controller from causing the tracking frequency deviation. As a result, the gain of the fundamental frequency becomes smaller, and the output characteristics of the inverter can be obtained by using the quasi-proportional resonant controller. However, the harmonic suppression effect of quasi-proportional resonance controller on other frequency points is not ideal. By adding quasi-resonant controller, multi-quasi proportional resonance controller can suppress the fifth and seventh harmonics. According to the principle of system output tracking input described in classical control theory, Based on the principle of superposition of linear system and the analysis of frequency domain, the steady-state error of AC quantity is solved. The principle that the proportional complex integral controller has infinite gain at the fundamental frequency is described in detail. On the basis of the proportional complex integral controller, the cutoff frequency and integral link are increased. In this paper, the controller of quasi-proportional complex integral plus integral is put forward. The software simulation model is built by MATLAB/simulink software. The control strategy of double closed loop proportional integral and double closed loop multiple quasi proportional resonance is proposed, respectively. The control strategy of double closed loop quasi-proportional complex integral and the control strategy of double closed loop quasi-proportional complex integral plus integral are simulated and studied. The experimental platform is built and tested. Based on the TLI-X00 modular power electronics platform in laboratory, the control strategy of double closed loop quasi-proportional complex integral and the control strategy of double closed-loop quasi-proportional complex integral plus integral are simulated. A LC filter is designed and fabricated, which is used to filter and collect the capacitance voltage and inductance current of the filter in real time. The space vector pulse width modulation process is realized by the software. The e PWM module register and the ADC sampling module register of TMS320F28335 are configured. The PWM driving signal is generated and the sampling function is realized. The control strategy of double closed loop multiplex quasi-proportional resonance control and double closed loop quasi-proportional complex integral plus integral is verified by using the inverter experimental platform. The simulation and experimental results show that, Compared with the other three control strategies, the double closed loop quasi-proportional complex integral plus integral control strategy can effectively suppress the harmonic and the current disturbance caused by the sudden change of load, and achieve a good control effect.
【學位授予單位】：陜西科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM464

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