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  本文選題：含光儲能微電網(wǎng)　切入點：比例諧振控制　出處：《西南交通大學(xué)》2014年碩士論文

【摘要】：微電網(wǎng)是實現(xiàn)新能源利用的有效途徑,微電網(wǎng)運行控制研究對提高新能源的利用率,增強微電網(wǎng)的靈活性和穩(wěn)定性有著重要意義。微電網(wǎng)平滑切換控制和孤島檢測方法是微電網(wǎng)控制技術(shù)的重要組成部分,本文以含光儲能系統(tǒng)的微電網(wǎng)為研究對象,對微電網(wǎng)的平滑切換控制策略和孤島檢測方法進(jìn)行研究。 首先,分析了光伏電源和蓄電池的控制方法和數(shù)學(xué)模型,利用MATLAB/Simulink搭建了光伏電源控制模型和蓄電池充放電控制電路模型,實現(xiàn)了光伏電源的最大功率跟蹤和蓄電池的恒電壓充放電控制。 其次,在分析微電網(wǎng)的運行控制方式及控制策略的基礎(chǔ)上,研究了逆變器的控制電路和數(shù)學(xué)模型。將比例諧振控制器引入到電流內(nèi)環(huán)控制中,使控制更簡單、抗電網(wǎng)電壓干擾能力更強,消除了坐標(biāo)變換和功率解耦控制。 然后,利用含光儲能系統(tǒng)的微電網(wǎng)對微電網(wǎng)平滑切換控制進(jìn)行研究,引入狀態(tài)跟隨器有效改善了控制切換過程。對切換控制器和切負(fù)荷的先后順序進(jìn)行了仿真研究,將3區(qū)域切負(fù)荷控制策略引入到含光儲能系統(tǒng)的微電網(wǎng),仿真結(jié)果表明該控制策略可有效降低切負(fù)荷帶來的暫態(tài)振蕩。 最后,在分析孤島檢測原理的基礎(chǔ)上,改進(jìn)了有功-電壓孤島檢測算法,設(shè)置逆變器輸出有功功率為公共耦合點處電壓與電網(wǎng)額定電壓差值的正反饋函數(shù)。并與無功-頻率孤島檢測算法進(jìn)行了對比研究,對檢測原理進(jìn)行了分析并設(shè)計了反饋參數(shù),最后進(jìn)行了仿真驗證。 理論分析和仿真驗證表明,采用比例諧振電流內(nèi)環(huán)控制器的光伏電源具有較強的抗電網(wǎng)電壓干擾能力；狀態(tài)跟隨器和3區(qū)域切負(fù)荷控制可以有效降低微電網(wǎng)切換過程的暫態(tài)振蕩；改進(jìn)的有功-電壓正反饋擾動孤島檢測算法檢測速度快、對并網(wǎng)電能質(zhì)量影響小、沒有檢測盲區(qū),本文的研究成果對微電網(wǎng)運行控制有一定的參考價值。
[Abstract]:Microgrid is an effective way to realize the utilization of new energy. It is of great significance to enhance the flexibility and stability of microgrid. Smooth switching control and islanding detection are important parts of microgrid control technology. The smooth switching control strategy and islanding detection method of microgrid are studied. Firstly, the control methods and mathematical models of photovoltaic power supply and battery are analyzed, and the control model of photovoltaic power supply and battery charge and discharge control circuit are built by using MATLAB/Simulink. The maximum power tracking of photovoltaic power supply and the constant voltage charge and discharge control of battery are realized. Secondly, on the basis of analyzing the operation control mode and control strategy of microgrid, the control circuit and mathematical model of inverter are studied. The proportional resonant controller is introduced into the current inner loop control to make the control simpler. The ability of resisting grid voltage interference is stronger, eliminating coordinate transformation and power decoupling control. Then, the smooth switching control of microgrid is studied by using the microgrid with optical energy storage system, and the switching process is improved effectively by introducing the state follower. The switching controller and the sequence of load shedding are simulated. The three-region load shedding control strategy is introduced to the micro-grid with optical energy storage system. The simulation results show that the proposed control strategy can effectively reduce the transient oscillation caused by the shedding load. Finally, on the basis of analyzing the principle of islanding detection, the active power-voltage islanding detection algorithm is improved. The output active power of the inverter is the positive feedback function of the difference between the voltage at the common coupling point and the rated voltage of the power network. The detection principle is analyzed and the feedback parameters are designed and compared with the reactive power-frequency islanding detection algorithm. Finally, the simulation is carried out. The theoretical analysis and simulation results show that the photovoltaic power supply with proportional resonant current inner loop controller has strong resistance to grid voltage interference. The state follower and 3-region load shedding control can effectively reduce the transient oscillation in the switching process of microgrid, and the improved active power-voltage positive feedback disturbance islanding detection algorithm has the advantages of fast detection speed, little influence on the power quality of grid-connected power, and no blind spot detection. The research results of this paper have certain reference value for microgrid operation control.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM727

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