本文關(guān)鍵詞：基于下垂控制的三相逆變器并聯(lián)技術(shù)研究　出處：《南京航空航天大學》2014年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 三相逆變器 下垂控制 改進型下垂 建模分析

【摘要】：近年來，分布式新能源發(fā)電由于其具有安全可靠、節(jié)能環(huán)保、技術(shù)先進等優(yōu)點，并且分布式發(fā)電與大電網(wǎng)相結(jié)合還能提高系統(tǒng)的安全性與靈活性，被能源和電力專家一致認為是21世紀電力工業(yè)的主要發(fā)展模式。隨著分布式發(fā)電技術(shù)的不斷發(fā)展，對其容量、穩(wěn)定性、可擴展性等提出了更高的要求，逆變器并聯(lián)是一種行之有效的解決措施，是實現(xiàn)上述要求的基礎(chǔ)。此外，在航空場合，隨著多電飛機及全電飛機的推廣，機載電子設(shè)備的不斷增加，逆變器并聯(lián)技術(shù)也表現(xiàn)出了很好的應(yīng)用前景，可解決機載電源系統(tǒng)對容量、穩(wěn)定性、可靠性和可擴展性等方面的需求。因此，研究逆變器并聯(lián)技術(shù)具有重要意義。 本文首先回顧總結(jié)了現(xiàn)有逆變器并聯(lián)系統(tǒng)的結(jié)構(gòu)和控制方法，相比而言，下垂控制方法具有抗干擾能力強、擴容和維護方便、運行可靠等突出優(yōu)點而被廣泛關(guān)注，是當前的研究熱點和重點。但是，采用下垂控制的逆變器并聯(lián)系統(tǒng)穩(wěn)定性及系統(tǒng)參數(shù)設(shè)計還有待深入分析。因此，本文選擇基于下垂控制策略的三相逆變器并聯(lián)系統(tǒng)展開研究，旨在深入探討并聯(lián)系統(tǒng)的穩(wěn)定性，優(yōu)化設(shè)計系統(tǒng)的各項參數(shù)，提高系統(tǒng)的性能指標，為下垂控制策略的優(yōu)化設(shè)計提供理論指導。 隨后，本文利用動態(tài)相量法對采用傳統(tǒng)下垂控制的逆變器并聯(lián)系統(tǒng)進行小信號建模。在此基礎(chǔ)上，通過對有功-頻率下垂系統(tǒng)及無功-幅值下垂系統(tǒng)的穩(wěn)定性進行深入的分析，推導了能維持系統(tǒng)穩(wěn)定運行的頻率及電壓幅值下垂系數(shù)的取值范圍，并給出了優(yōu)化設(shè)計的方法，為工程設(shè)計奠定了理論基礎(chǔ)。并針對傳統(tǒng)下垂控制方式存在的動態(tài)性能較差、具有靜態(tài)誤差等缺點，論文介紹了一種改進的下垂控制方式。通過對該改進型下垂控制方式進行小信號建模分析，，找出了下垂方程中各項參數(shù)對系統(tǒng)性能影響的規(guī)律，從而給出了各個參數(shù)的優(yōu)化設(shè)計方法，為后續(xù)研究提供了理論基礎(chǔ)。 其次，論文基于MATLAB/Simulink平臺，分別搭建了采用傳統(tǒng)下垂控制方式和改進型下垂控制方式的逆變器并聯(lián)系統(tǒng)仿真模型。同時，設(shè)計了一套基于TMS320F28335的三相逆變器并聯(lián)實驗平臺，給出了系統(tǒng)的硬件設(shè)計和軟件設(shè)計，并在此平臺上對上述理論進行了實驗驗證。仿真和實驗結(jié)果表明采用下垂控制策略的逆變器并聯(lián)系統(tǒng)能夠很好地實現(xiàn)電流及功率的均分，動態(tài)響應(yīng)良好，驗證了理論分析的正確性和可行性。
[Abstract]:In recent years, distributed new energy generation has the advantages of safety and reliability, energy saving and environmental protection, advanced technology, and the combination of distributed generation and large power grid can also improve the security and flexibility of the system. In 21th century, energy and power experts agree that it is the main mode of development of power industry. With the continuous development of distributed generation technology, the capacity, stability, scalability and so on put forward higher requirements. Parallel inverter is an effective solution, is the basis to achieve the above requirements. In addition, in aviation, with the promotion of multi-electric aircraft and all-electric aircraft, the number of airborne electronic equipment continues to increase. Parallel inverter technology also shows a good application prospects, can solve the airborne power system for capacity, stability, reliability and scalability, and so on. It is of great significance to study the parallel technology of inverter. In this paper, the structure and control methods of the inverter parallel system are reviewed firstly. Compared with the traditional control method, the droop control method has the advantages of strong anti-interference ability, easy to expand and maintain. The stability and system parameter design of parallel inverter with droop control is still to be analyzed deeply because of its outstanding advantages such as reliable operation and wide attention, which is the focus and focus of current research. In this paper, a three-phase inverter parallel system based on droop control strategy is selected to discuss the stability of the parallel system, optimize the parameters of the system, and improve the performance of the system. It provides theoretical guidance for optimal design of droop control strategy. Then, the dynamic phasor method is used to model the inverter parallel system with traditional droop control. Through the deep analysis of the stability of active power-frequency droop system and reactive power-amplitude droop system, the range of frequency and voltage sagging coefficient which can maintain the stable operation of the system is deduced. The method of optimal design is given, which lays a theoretical foundation for engineering design, and aims at the disadvantages of poor dynamic performance and static error in the traditional droop control mode. In this paper, an improved droop control method is introduced. Through the small signal modeling and analysis of the improved droop control mode, the law of the influence of the parameters in the droop equation on the performance of the system is found out. Thus, the optimal design method of each parameter is given, which provides a theoretical basis for further research. Secondly, based on MATLAB/Simulink platform, the simulation model of inverter parallel system using traditional droop control mode and improved droop control mode is built. A parallel experiment platform of three-phase inverter based on TMS320F28335 is designed. The hardware design and software design of the system are given. The simulation and experimental results show that the parallel inverter system with droop control strategy can achieve the average current and power distribution, and the dynamic response is good. The correctness and feasibility of the theoretical analysis are verified.
【學位授予單位】：南京航空航天大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM464

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本文編號：1414907