本文關(guān)鍵詞：基于三電平DC-DC變換器的風儲雙極性直流微電網(wǎng)運行控制策略研究　出處：《太原理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 雙極性直流微電網(wǎng) 三電平DC-DC變換器 充放電分離 電壓分區(qū)間控制 中點電位平衡

【摘要】：直流微電網(wǎng)作為新的能源結(jié)網(wǎng)形式,集成風力、光伏等新能源發(fā)電單元、儲能單元及本地負荷,實現(xiàn)可再生能源的高效利用,成為當前國內(nèi)外研究熱點。目前直流微電網(wǎng)主要采用單極性結(jié)構(gòu),系統(tǒng)的運行效率較低。本文研究了基于三電平DC-DC變換器接入的雙極性直流微電網(wǎng)結(jié)構(gòu),該結(jié)構(gòu)減小了母線對地電壓,提高了系統(tǒng)運行效率,且可滿足不同變換器和負荷對各電壓等級的要求,并基于此結(jié)構(gòu)提出了相應(yīng)的運行控制策略,主要研究內(nèi)容包括:第一,詳細研究了雙極性直流微電網(wǎng)中三電平變換器的拓撲結(jié)構(gòu)和工作原理,根據(jù)能量雙向流動特性將其分為三電平Boost變換器和三電平Buck變換器,并分析其工作狀態(tài)與輸入輸出關(guān)系。研究了風電單元中的三電平Boost變換器,同時建立該變換器的狀態(tài)空間數(shù)學(xué)模型。第二,重點研究了基于三電平Boost變換器的風電單元控制策略。建立了風電單元中各部分的模型,分析了風電機組在不同風速下的運行特性。在此基礎(chǔ)上,提出風能利用系數(shù)恒定區(qū)域的最大功率跟蹤控制(maximum power point tracking,MPPT)與高風速區(qū)域的恒轉(zhuǎn)速、恒功率控制策略。根據(jù)三電平Boost變換器輸出特性,設(shè)計了中點電位平衡控制以保證分裂電容電壓平衡。最后通過Matlab/Simulink仿真驗證了風電單元策略的有效性。該控制策略保證了風機在各個風速區(qū)域內(nèi)穩(wěn)定運行,實現(xiàn)了區(qū)域間平滑切換,提高了風能的利用效率。第三,著重研究了基于三電平雙向DC-DC變換器的儲能單元控制策略。分析了超級電容器的工作原理和等效電路模型,建立了電壓下垂特性關(guān)系。根據(jù)直流母線電壓波動范圍,將超級電容器的運行分成不動作、下垂控制、恒流充放電三個階段,并提出一種充放電模式分離的控制策略。最后通過Matlab/Simulink仿真驗證了儲能單元控制策略的合理性。該控制策略在充電模式或放電模式時只需兩個開關(guān)管導(dǎo)通,降低了控制的復(fù)雜性。第四,提出了風儲雙極性直流微電網(wǎng)母線電壓分區(qū)間運行控制策略。分析了風儲雙極性直流微電網(wǎng)結(jié)構(gòu)和功率平衡關(guān)系,并根據(jù)微電網(wǎng)不同狀態(tài)將母線電壓分成四個運行區(qū)間。通過風電單元的風電特性控制與基于下垂特性的限功率控制、儲能單元的充放電分離控制配合負荷單元的減載控制,實現(xiàn)了各狀態(tài)的穩(wěn)定運行與各區(qū)間的平滑切換。第五,搭建了含風電單元、超級電容儲能裝置和直流負荷的雙極性直流微電網(wǎng)實驗平臺,通過實驗驗證了控制策略在不同母線電壓下運行與不同狀態(tài)間切換的表現(xiàn)。結(jié)果表明,母線電壓分區(qū)間運行控制策略可以調(diào)節(jié)母線電壓和平衡系統(tǒng)功率,從而確保了風儲雙極性直流微電網(wǎng)穩(wěn)定運行。
[Abstract]:DC microgrid as a new form of energy grid integration of wind photovoltaic and other new energy generation units energy storage units and local load to achieve the efficient use of renewable energy. At present, DC microgrid mainly adopts unipolar structure. The structure of bipolar DC microgrid based on three-level DC-DC converter is studied in this paper, which reduces the bus voltage to the ground and improves the efficiency of the system. And it can meet the requirements of different converter and load on each voltage level. Based on this structure, the corresponding operation control strategy is proposed. The main research contents are as follows: first. The topology and working principle of three-level converter in bipolar DC microgrid are studied in detail. According to the characteristics of bi-directional energy flow, it is divided into three-level Boost converter and three-level Buck converter. The three-level Boost converter in wind power unit is studied, and the state space mathematical model of the converter is established. Second, the relationship between the operation state and the input and output of the converter is analyzed. Second, the three-level Boost converter in the wind power unit is studied. The control strategy of wind power unit based on three-level Boost converter is studied emphatically. The model of each part of wind power unit is established, and the operating characteristics of wind turbine unit under different wind speed are analyzed. The maximum power point tracking control (MPPT) in the region of constant wind power utilization coefficient and constant speed in high wind speed region are proposed. Constant power control strategy. According to the output characteristics of three-level Boost converter. The midpoint potential balance control is designed to ensure the voltage balance of split capacitor. Finally, the effectiveness of wind power unit strategy is verified by Matlab/Simulink simulation. Stable operation in the wind speed zone. The smooth switching between regions is realized and the utilization efficiency of wind energy is improved. Third. The control strategy of energy storage unit based on three-level bi-directional DC-DC converter is studied, and the working principle and equivalent circuit model of supercapacitor are analyzed. According to the voltage fluctuation range of DC bus, the operation of supercapacitor is divided into three stages: no action, droop control, constant current charge and discharge. A control strategy of charging and discharging mode separation is proposed. Finally, the rationality of the control strategy of energy storage unit is verified by Matlab/Simulink simulation. The control strategy is in charge mode or discharge mode. It only takes two switches to switch on. The complexity of the control is reduced. In 4th, the operation control strategy of wind storage bipolar DC microgrid bus is proposed, and the structure of wind storage bipolar DC microgrid and the power balance relationship are analyzed. According to the different states of microgrid, the bus voltage is divided into four operation areas. The wind power characteristic control of wind power unit and the power limit control based on droop characteristic are carried out. The charge / discharge separation control of the energy storage unit and the load reduction control of the load unit realize the stable operation of each state and the smooth switching of each interval. 5th, the wind power unit is built. The performance of the control strategy under different bus voltages and switching between different states is verified by experiments on supercapacitor energy storage device and bipolar DC microgrid with DC load. The busbar voltage division operation control strategy can adjust the bus voltage and balance the system power, thus ensuring the stable operation of the wind storage bipolar DC microgrid.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM46;TM727

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