本文選題：微電網(wǎng)　切入點(diǎn)：光伏發(fā)電　出處：《大連理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：近年來(lái),分布式發(fā)電以其能就地消化電力,減少集中輸電的線路損耗,與大電網(wǎng)供電互為補(bǔ)充,減少電網(wǎng)容量,可以減少對(duì)環(huán)境的污染等優(yōu)點(diǎn)受到了廣泛關(guān)注,尤其是光伏和風(fēng)力發(fā)電得到了快速發(fā)展。然而,隨著分布式電源接入大電網(wǎng)的數(shù)量不斷增加,其本身存在的單機(jī)接入成本高、對(duì)大電網(wǎng)是一個(gè)不可控源及并入電網(wǎng)的結(jié)構(gòu)限制等問題也日益凸現(xiàn)出來(lái),這在很大程度上限制了分布式電源的發(fā)展。為了協(xié)調(diào)分布式電源與大電網(wǎng)間的矛盾,充分挖掘分布式發(fā)電為電網(wǎng)和用戶所帶來(lái)的價(jià)值,美國(guó)、歐盟、日本等國(guó)相繼提出了微電網(wǎng)(Micro grid)的概念。微電網(wǎng)既突破了分布式電源的發(fā)展瓶頸,又增強(qiáng)了大電網(wǎng)的末端供電能力。但其改變了系統(tǒng)的結(jié)構(gòu)和性能,使得系統(tǒng)管理趨于復(fù)雜化,因此,微電網(wǎng)擁有獨(dú)特的能量管理系統(tǒng),光伏電源想要融入其中,必須在發(fā)電控制方面與其良好配合。并網(wǎng)運(yùn)行時(shí),微電網(wǎng)能量管理系統(tǒng)要求光伏電源以電流源形式運(yùn)行,中央管理器以程序指令方式統(tǒng)籌各個(gè)逆變器發(fā)送電能,同時(shí)要求各逆變器盡量減小輸出電能的諧波含量。本文在光伏逆變器并網(wǎng)建�；A(chǔ)上,提出空間矢量脈寬調(diào)制定功率控制策略,使光伏逆變器按中央管理器指令定功率發(fā)送電能。通過仿真結(jié)果和物理實(shí)驗(yàn)結(jié)果驗(yàn)證了所提控制策略的正確性和有效性。孤島運(yùn)行時(shí),由于失去大電網(wǎng)的支撐,母線電壓會(huì)產(chǎn)生波動(dòng)。這時(shí),微電網(wǎng)能量管理系統(tǒng)要求光伏電源轉(zhuǎn)變控制策略以電壓源形式運(yùn)行,動(dòng)態(tài)維持微電網(wǎng)內(nèi)能量平衡,穩(wěn)定母線電壓。本文提出光伏逆變器采用基于主從模式的下垂控制,維持微電網(wǎng)能量平衡,為其它分布式電源運(yùn)行提供支持,通過仿真和實(shí)驗(yàn)驗(yàn)證了所提控制策略的有效性。并網(wǎng)/孤島切換過程中,如果微電網(wǎng)內(nèi)旋轉(zhuǎn)負(fù)載比例過高,有可能會(huì)因?yàn)橹醒牍芾砥鞴聧u檢測(cè)時(shí)間過長(zhǎng)或線路傳輸延時(shí)等情形導(dǎo)致運(yùn)行狀態(tài)切換失敗。本文提出采用超級(jí)電容器和DC/DC斬波電路構(gòu)成儲(chǔ)能裝置,給切換過程提供能量支撐,穩(wěn)定逆變器直流側(cè)電壓,通過仿真驗(yàn)證了所提方法的正確性和有效性。
[Abstract]:In recent years, distributed generation with its in situ digestion power, reducing the transmission loss on transmission power, and complement each other, reduce the power capacity, it could reduce the pollution to the environment has attracted extensive attention, especially photovoltaic and wind power generation has been rapid development. However, as the number of distributed power grid increase in the cost of stand-alone access exist in itself, on the grid is not a controlled source and the grid structure limits and other issues are also increasingly prominent, which limits the development of distributed power supply to a great extent. In order to coordinate distributed power and the power system, to fully tap the power of distributed generation and users to bring value to the United States, European Union, Japan and other countries have put forward the micro grid (Micro grid). The concept of micro grid can break through the bottleneck of the development of distributed power supply, and Enhance the power supply capacity of large power grid at the end. But it changed the structure and performance of the system, makes the system management become more complicated. Therefore, the micro grid energy management system has a unique, photovoltaic power to integrate into one, must be in power control and good coordination. And network operation, micro grid energy management system for photovoltaic the power to run the current source, the central manager with overall program instructions of each inverter transmitting electric energy, and the inverter to reduce the harmonic content of the output power. Based on the modeling of photovoltaic grid connected inverter based on space vector PWM is proposed to make the power control strategy of the PV inverter according to the central manager instruction set power transmission power. The simulation results and the experiment results verify the validity and effectiveness of the proposed control strategy. The island operation, due to loss of power Network support, bus voltage will fluctuate. At this time, the micro grid energy management system for photovoltaic power shift control strategy to maintain the dynamic voltage source, micro grid energy balance, stability of bus voltage. This paper proposes the use of master-slave mode PV inverter droop control based on micro grid, maintain energy balance, to provide support for other distributed the power supply operation, through simulation and experimental validation of the effectiveness of the proposed control strategy. The grid / Island switching process, if the micro grid in the rotating load ratio is too high, it may be because the central manager islanding detection time is too long or the transmission delay due to running switch failure. In this paper, using the super capacitor and DC/DC chopper circuit storage device for switching process to provide energy support, stable DC voltage of inverter, the simulation verification of the proposed side The validity and validity of the law.

【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TM615

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本文編號(hào)：1572824