本文關(guān)鍵詞：AC-DC矩陣變換器調(diào)制與控制策略的研究　出處：《山東大學(xué)》2014年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： AC-DC矩陣變換器 空間矢量調(diào)制 共模電壓 電源電壓畸變 滑模變結(jié)構(gòu)控制 單周期控制 諧振抑制

【摘要】：AC-DC矩陣變換器是一種拓撲結(jié)構(gòu)新穎的降壓型通用整流裝置,由于無需大容量儲能元件,所以具有結(jié)構(gòu)緊湊、能量密度高、可靠性和可維護性好的優(yōu)點,非常適合對重量、體積、效率和可靠性要求較高的應(yīng)用場合。同時,其正弦輸入電流的功率因數(shù)可以自由調(diào)節(jié),最高可達1,具有天然的能量回饋能力,可以輸出雙極性電壓并導(dǎo)通雙向電流,允許負載四象限運行,符合理想整流器的基本要求。本文將理論分析、計算機仿真和樣機實驗相結(jié)合,系統(tǒng)、深入地研究了AC-DC矩陣變換器的空間矢量調(diào)制策略、新型非線性控制策略和諧振抑制方法等關(guān)鍵技術(shù)問題,為AC-DC矩陣變換器的實用化提供了理論支持和技術(shù)準備。 本文首先從AC-DC矩陣變換器的空間矢量調(diào)制策略出發(fā),深入分析了AC-DC矩陣變換器的變換關(guān)系。為了抑制共模電壓峰值和減少窄脈沖的產(chǎn)生,提出了一種利用有效電流矢量代替零電流矢量的改進型空間矢量調(diào)制策略及其優(yōu)化的開關(guān)調(diào)制模式。然后在考慮換流時間的基礎(chǔ)上,推導(dǎo)了使用傳統(tǒng)空間矢量調(diào)制策略搭配不同開關(guān)調(diào)制模式,及使用改進型空間矢量調(diào)制策略時,窄脈沖產(chǎn)生幾率與調(diào)制度和扇區(qū)角度的關(guān)系表達式。理論分析證明,所提算法不僅對共模電壓幅值、有效值和諧波含量有明顯的抑制效果,還可在更寬的調(diào)制度范圍內(nèi)獲得較優(yōu)的輸入、輸出性能。仿真和實驗結(jié)果驗證了算法的可行性和有效性。 針對AC-DC矩陣變換器抗電網(wǎng)畸變能力較差的問題,首先定量分析了AC-DC矩陣變換器在電源電壓幅值不平衡和波形非正弦情況下的工作特性,推導(dǎo)了輸入、輸出各電量的解析表達式。然后提出了一種αβ坐標系下空間矢量調(diào)制策略的通用實現(xiàn)方法,其特點是可以靈活構(gòu)造期望輸入電流矢量,改變AC-DC矩陣變換器的工作特性。最后以獲得平直的輸出直流電壓為目的,提出了一種期望輸入電流矢量的構(gòu)造方法,可以同時補償電源電壓矢量幅值和角速度不恒定造成的輸出直流電壓脈動。同時,該補償控制策略有效減少了開平方、三角函數(shù)和反三角函數(shù)等復(fù)雜運算的次數(shù),更利于工程實現(xiàn)。理論分析的正確性和算法的可行性得到了仿真實驗的驗證。 提出了一種基于空間矢量表達和滑模變結(jié)構(gòu)的非線性控制策略。推導(dǎo)了AC-DC矩陣變換器的誤差狀態(tài)空間模型,討論了滑模切換線的選取方法,給出了滑動模態(tài)的可到達條件并設(shè)計了開關(guān)表。著重研究了控制器參數(shù)對變換器性能的影響,從最大化滑模存在域?qū)挾群徒档烷_關(guān)頻率的角度出發(fā),給出了控制器參數(shù)選擇方法。實驗結(jié)果證明,基于本控制策略的AC-DC矩陣變換器具有算法簡單、無穩(wěn)態(tài)誤差、動態(tài)響應(yīng)速度快、抗網(wǎng)側(cè)干擾能力強和輸入功率因數(shù)高等優(yōu)點。 輸入LC濾波器是AC-DC矩陣變換器中不可或缺的重要組成部分,但是其固有的諧振特性易被電源電壓中的諧波污染或輸入電流中的諧波分量激發(fā),造成變換器無法正常工作。為了在抑制輸入濾波器諧振的同時,改善AC-DC矩陣變換器的運行特性,提出了一種兩相同步旋轉(zhuǎn)坐標系下的雙閉環(huán)反饋控制策略。分別利用單周期控制技術(shù)和經(jīng)典控制理論設(shè)計了輸入電流內(nèi)環(huán)控制器和負載電壓外環(huán)調(diào)節(jié)器,并從數(shù)學(xué)的角度討論了單周期控制策略與空間矢量調(diào)制策略的異同點。提出了一種具有選頻特性的主動阻尼控制策略,并將其與輸入電流內(nèi)環(huán)控制器相結(jié)合,避免了類似算法中復(fù)雜的歸一化和三角函數(shù)運算,降低了軟件復(fù)雜度。在考慮實際控制器延時的基礎(chǔ)上,分析了控制器參數(shù)對系統(tǒng)穩(wěn)定性的影響。提出了一種基于DSP和CPLD的單周期控制器實現(xiàn)方法,使得數(shù)字化單周期控制成為可能。實驗結(jié)果驗證了所提算法的有效性和數(shù)字單周期控制的可行性。 本文通過對AC-DC矩陣變換器調(diào)制策略和控制策略的研究,得出了一些有意義的經(jīng)驗和結(jié)論,為AC-DC矩陣變換器進一步的實用化研究提供了一定的技術(shù)基礎(chǔ)。
[Abstract]:AC-DC matrix converter is a novel topology of general step-down rectifying device, without the need for large capacity storage devices, so it has the advantages of compact structure, high energy density, reliability and maintainability good advantage, very suitable for weight, volume, efficiency and reliability of applications to higher requirements. At the same time, power the factor of sinusoidal input current can be adjusted up to 1, has a natural regenerative capacity, can output bipolar voltage and turn-on bidirectional current, allowing the load of four quadrant operation, meet the basic requirements of an ideal rectifier. In this paper, theoretical analysis, computer simulation and experiment combination system, in-depth study of the space vector modulation strategy of matrix converter AC-DC, the key technical problems of strategy harmonic suppression methods for nonlinear control model, AC-DC matrix converter provides theoretical support and practical Holding and technical preparation.
This paper from the space vector modulation strategy of matrix converter AC-DC based on in-depth analysis of the relationship between the AC-DC transformation matrix converter. In order to suppress the common mode voltage peak and reduce the narrow pulse generation, proposed switch modulation mode improved space vector modulation strategy is an effective use of current vector instead of zero current vector and then optimized. Considering the commutation time, derived using traditional space vector modulation strategy of different collocation switch modulation mode, and use the improved space vector modulation strategy, the relationship between expression of pulse generation and modulation rate and sector angle. Theoretical analysis proves that the proposed algorithm not only on common mode voltage amplitude, RMS suppression the obvious effect of harmonic content, can also get better input, while the modulation range of output performance. The simulation and experimental results verify the calculation The feasibility and effectiveness of the law.
According to the AC-DC matrix converter power grid anti distortion ability is poor, the quantitative analysis of AC-DC matrix converter in the power supply voltage unbalance and non sinusoidal condition characteristics and waveform, deduces the analytical expression of the output of each input power. Then a new method is proposed to realize the general vector modulation strategy of alpha beta coordinates. The space, which is characterized by flexible structure expected input current vector, change the operating characteristics of AC-DC matrix converter. Finally, in order to obtain the output DC voltage level for the purpose, proposed a method to construct the desired input current vector, the output DC voltage ripple compensation can also supply voltage vector amplitude and angular velocity is not constant cause at the same time, the compensation control strategy can effectively reduce the number of times square, complex calculation of trigonometric and inverse trigonometric function, more conducive to the realization of the project. The correctness of the analysis and the feasibility of the algorithm are verified by the simulation experiment.
This paper presents a nonlinear variable structure space vector expression and sliding mode control scheme based on error. The state space model of AC-DC matrix converter is deduced, the method of selecting the switching line, given the sliding mode reaching conditions and the design of the switching table. Emphatically studied the influence of controller parameters on the performance of the converter and from the maximum sliding domain width and reduce the switching frequency of the angle, gives the controller parameter selection method. Experimental results show that the AC-DC matrix converter control strategy based on a simple algorithm with no steady-state error, fast dynamic response, anti disturbance ability and network side input power factor is high.
The input LC filter is an important part of AC-DC matrix converter, but its inherent resonant characteristics are easily supply voltage harmonic pollution in or in the input current harmonic excitation, resulting in converter can not work normally. In order to suppress the resonance of the input filter at the same time, improve the working characteristics of AC-DC matrix converter. Put forward a double closed loop synchronous rotary coordinate feedback control strategy. Using one cycle control technique and classical control theory to design the input current loop controller and load voltage regulator, and from the angle of mathematics is discussed. One cycle control strategy and the space vector modulation strategy is proposed. The similarities and differences active damping has frequency selective properties of the control strategy, and combine it with the input current loop controller, avoiding the complex and similar normalization algorithm The operation of trigonometric function, reduce the software complexity. In consideration of the actual controller delay, analyzes the influence of controller parameters on the stability of the system. A new method is proposed to realize single cycle controller based on CPLD and DSP, the digital one cycle control possible. Experimental results verify the feasibility and effectiveness of the proposed algorithm. The digital one cycle control.
Based on the research of modulation strategy and control strategy of AC-DC matrix converter, some meaningful experiences and conclusions are obtained, which provide a technical basis for further practical research of AC-DC matrix converter.

【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TM46

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