發(fā)布時間：2018-04-29 05:04

  本文選題：分布式發(fā)電系統(tǒng) + 并網(wǎng)逆變器�。� 參考：《燕山大學(xué)》2014年碩士論文

【摘要】：可再生能源用作發(fā)電源的分布式發(fā)電已成為當(dāng)今能源產(chǎn)業(yè)的發(fā)展方向，作為電網(wǎng)與分布式發(fā)電源之間的橋梁，逆變器成為了研究的熱點。本文以三相電壓源型并網(wǎng)逆變器系統(tǒng)為研究對象，研究了分布式發(fā)電系統(tǒng)并網(wǎng)運行狀態(tài)下的功率控制問題和直流母線電壓的控制問題。通過控制并網(wǎng)逆變器的輸出電流來控制其輸出功率，實現(xiàn)了對有功和無功功率的解耦控制，滿足了電網(wǎng)的功率需求。 首先，介紹了電壓源型逆變器的工作原理與數(shù)學(xué)描述。分析了并網(wǎng)逆變器系統(tǒng)的結(jié)構(gòu)組成，建立了系統(tǒng)在不同坐標(biāo)系下的數(shù)學(xué)模型，為后續(xù)章節(jié)的研究做好鋪墊。 其次，針對傳統(tǒng)三相電壓源型并網(wǎng)逆變器系統(tǒng)的非線性特性以及參數(shù)攝動、外部干擾帶來的不確定性，，采用自適應(yīng)控制策略。應(yīng)用自適應(yīng)Backstepping技術(shù)設(shè)計了具有干擾抑制功能的自適應(yīng)控制器，對逆變器的輸出功率進行控制，實現(xiàn)了系統(tǒng)的單位功率因數(shù)運行，同時保證了直流母線電壓的平穩(wěn)。理論分析與仿真實驗均驗證了所采用的控制策略的有效性。 最后，研究交流電網(wǎng)功率需求發(fā)生變化時的功率跟蹤控制問題。采用LCL型并網(wǎng)逆變器拓撲結(jié)構(gòu)，考慮到系統(tǒng)階次高的特點，運用Backstepping遞歸控制思想推導(dǎo)控制律，同時針對運行過程中系統(tǒng)的參數(shù)變化等不確定性因素，采用魯棒控制策略設(shè)計控制器。在控制并網(wǎng)有功功率的同時實現(xiàn)了對電網(wǎng)的無功功率的補償控制，保證了系統(tǒng)的穩(wěn)定運行。仿真研究表明所采取的控制策略可以實現(xiàn)對逆變器輸出功率的有效控制，并且克服了系統(tǒng)參數(shù)變化對系統(tǒng)性能的影響。
[Abstract]:Distributed generation of renewable energy as power generation has become the development direction of the energy industry. As a bridge between power grid and distributed generation, inverter has become a hot research topic. In this paper, a three-phase voltage source grid-connected inverter system is studied. The power control problem and the DC bus voltage control problem are studied under the condition of grid-connected operation of distributed generation system. The output power of grid-connected inverter is controlled by controlling the output current of grid-connected inverter. The decoupling control of active and reactive power is realized and the power demand of power grid is satisfied. Firstly, the working principle and mathematical description of voltage source inverter are introduced. The structure of grid-connected inverter system is analyzed, and the mathematical models of the system in different coordinate systems are established, which pave the way for the study of the following chapters. Secondly, the adaptive control strategy is adopted to solve the nonlinear characteristics of traditional three-phase voltage source grid-connected inverter system and the uncertainty caused by parameter perturbation and external disturbance. An adaptive controller with interference suppression function is designed by using adaptive Backstepping technology. The output power of the inverter is controlled. The unit power factor of the system is realized and the DC bus voltage is stable. The effectiveness of the proposed control strategy is verified by theoretical analysis and simulation experiments. Finally, the power tracking control problem is studied when the power demand of AC power system changes. Using the topology structure of LCL grid-connected inverter and considering the characteristic of high order of the system, the control law is deduced by using the idea of Backstepping recursive control. At the same time, the uncertain factors such as the change of system parameters during operation are considered. A robust control strategy is used to design the controller. The reactive power compensation control is realized while the active power connected to the grid is controlled, which ensures the stable operation of the system. Simulation results show that the proposed control strategy can effectively control the output power of the inverter and overcome the influence of the system parameters on the system performance.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM464

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