【摘要】：數(shù)字控制不僅具有高靈活性、可編程性等特點(diǎn)，而且可以采用更先進(jìn)的控制算法來提高功率開關(guān)變換器的綜合性能。因此，功率開關(guān)變換器由模擬控制轉(zhuǎn)向數(shù)字控制成為電力電子功率變換器的一種發(fā)展趨勢。由于數(shù)字控制DC-DC開關(guān)變換器會(huì)受到時(shí)間延遲、采樣和量化誤差等因素的影響，，其切換非線性特性的分析過程更復(fù)雜。因此，建立數(shù)字控制DC-DC開關(guān)變換器的模型至關(guān)重要。 本論文工作屬于導(dǎo)師主持的國家自然基金項(xiàng)目(編號(hào)：51077057)——“數(shù)字控制的開關(guān)功率變換器的建模、穩(wěn)定性分析及其應(yīng)用的研究”的部分內(nèi)容。論文對(duì)數(shù)字電流�？刂频腄C-DC變換器的建模及穩(wěn)定性進(jìn)行了深入研究，主要研究內(nèi)容為： (1)建立了數(shù)字控制DC-DC開關(guān)變換器的采樣量化模型，分析了其量化效應(yīng)。并基于此模型進(jìn)行了實(shí)例仿真分析，仿真結(jié)果表明：DPWM模塊的分辨率決定數(shù)字控制系統(tǒng)的最高性能。 (2)建立了數(shù)字電流�？刂艱C-DC開關(guān)變換器的更加完整的離散z域模型。本文首先對(duì)比分析了數(shù)字峰值電流�？刂扑惴ǖ男阅�；然后基于狀態(tài)空間平均法及交流小信號(hào)模型，求解出了其主功率級(jí)電路模型、峰值電流控制器及控制方式算法模型；最后考慮了環(huán)路中的時(shí)間延遲、采樣量化等因素，對(duì)系統(tǒng)進(jìn)行離散化處理，推導(dǎo)出了系統(tǒng)離散z域模型。 (3)理論分析了采樣保持環(huán)節(jié)和延遲環(huán)節(jié)對(duì)數(shù)字電流�？刂艱C-DC變換器的穩(wěn)定性的影響。理論分析表明：數(shù)字電流�？刂艱C-DC變換器的穩(wěn)定性不僅與電路參數(shù)有關(guān)，還受限于采樣周期T；延遲環(huán)節(jié)使系統(tǒng)相位產(chǎn)生滯后，進(jìn)而影響系統(tǒng)的穩(wěn)定性。 (4)設(shè)計(jì)出了數(shù)字化PI控制器，搭建了系統(tǒng)matlab/Simulink仿真模型，并對(duì)其進(jìn)行了穩(wěn)態(tài)、負(fù)載擾動(dòng)等仿真分析，仿真結(jié)果表明了數(shù)字電流�？刂频腄C-DC變換器具有良好的穩(wěn)態(tài)、抗負(fù)載擾動(dòng)性能，并檢驗(yàn)了系統(tǒng)模型的有效性和準(zhǔn)確性，驗(yàn)證了系統(tǒng)穩(wěn)定性的理論分析的正確性。 (5)仿真發(fā)現(xiàn)了數(shù)字電流�？刂艬oost變換器潛在的低頻振蕩現(xiàn)象，提出了利用閉環(huán)系統(tǒng)的特征根的方法更清晰、直觀地來揭示該現(xiàn)象產(chǎn)生的機(jī)理，并進(jìn)行了實(shí)例分析。
[Abstract]:The digital control not only has the characteristics of high flexibility, programmability and the like, but also can adopt more advanced control algorithm to improve the comprehensive performance of the power switch converter. Therefore, the power switch converter is a developing trend of the power electronic power converter by the analog control and steering digital control. Because the digital control DC-DC switching converter can be influenced by time delay, sampling and quantization error, the analysis process of switching nonlinear characteristics is more complex. Therefore, a model for establishing a digital control DC-DC switching converter is critical. The work of this paper is part of the national natural fund project (No.:51077057) _ "Modeling, stability analysis and application of digital-controlled switched-power converter" hosted by the tutor In this paper, the modeling and stability of the DC-DC converter controlled by digital current mode are studied in detail. In order to: (1) establish the sampling and quantization model of the digital control DC-DC switch converter, and analyze the quantity The simulation results show that the resolution of the DPWM module determines the most important of the digital control system. High performance. (2) The digital current mode is established to control the more complete separation of the DC-DC switch converter. This paper first compares the performance of the digital peak current mode control algorithm, and then, based on the state space average method and the AC small signal model, the main power level circuit model, the peak current controller and the control mode algorithm model are solved. Finally, the loop is considered The system is discretized and the system is deduced from the factors such as time delay, sampling and quantization. (3) The digital current mode control DC-DC converter is analyzed by the theory of the sample-hold and the delay. The theoretical analysis shows that the stability of the DC-DC converter is not only related to the circuit parameters but also the sampling period T. The delay link delays the phase of the system. In this paper, the digital PI controller is designed, the system matlab/ Simulink simulation model is set up, and the simulation and analysis of the steady state and the load disturbance are carried out. The simulation results show that the DC-DC converter with digital current mode control has good stability. State, anti-load disturbance performance, and verify the effectiveness and accuracy of the system model, and verify the stability of the system The correctness of the theory analysis is the correctness of the theoretical analysis. (5) The simulation shows that the potential low-frequency oscillation of the Boost converter is controlled by the digital current mode, and the method of using the characteristic root of the closed-loop system is more clear and intuitive to reveal the phenomenon.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM46

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