發(fā)布時間：2018-02-23 13:37

  本文關(guān)鍵詞： 分布式發(fā)電系統(tǒng) 雙饋異步風(fēng)力發(fā)電機(jī) 電壓源 下垂 多模式運行　出處：《浙江大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著新能源發(fā)電技術(shù)研究的廣泛開展,基于電流源輸出的雙饋(DFIG)風(fēng)電機(jī)組并網(wǎng)運行控制已得到深入的研究和應(yīng)用。但在分布式發(fā)電技術(shù)逐漸興起的局面下,需要依托較為穩(wěn)定的公共電網(wǎng)存在的DFIG風(fēng)電機(jī)組電流源控制技術(shù)將極大的限制其在分布式發(fā)電系統(tǒng)中配置。 為實現(xiàn)分布式發(fā)電系統(tǒng)中DFIG風(fēng)電機(jī)組靈活有效的介入,首先,通過將間接定子磁鏈定向(ISFO)控制策略應(yīng)用于DFIG機(jī)側(cè)變流器,建立了其電壓源輸出特性,配合設(shè)計的風(fēng)力機(jī)槳距角控制算法,滿足了其孤島單機(jī)運行需要。其次,考慮到分布式系統(tǒng)一般由多單元并聯(lián)構(gòu)成,引入下垂控制構(gòu)建了DFIG與其他分布式發(fā)電單元協(xié)同時的功率分配機(jī)制,為其提供了參與分布式發(fā)電系統(tǒng)孤島并聯(lián)運行的渠道。同時,為檢驗ISFO與下垂控制算法的協(xié)調(diào)能力,建立了DFIG電氣部分的小擾動數(shù)學(xué)模型,分析了關(guān)鍵控制參數(shù)對DFIG控制系統(tǒng)的影響,為風(fēng)電機(jī)組運行的穩(wěn)定性提供了必要的判據(jù)。再則,為滿足分布式發(fā)電系統(tǒng)并網(wǎng)運行和工作模式無縫切換的需要,參照電力系統(tǒng)二次調(diào)節(jié)方式,分別基于公共節(jié)點電壓頻率、電壓幅值反饋和發(fā)電單元輸出功率反饋建立了分布式發(fā)電系統(tǒng)孤島運行工作點和并網(wǎng)運行輸出功率的調(diào)節(jié)機(jī)制,使得DFIG能在硬件拓?fù)浣Y(jié)構(gòu)和控制算法保持連貫的情況下參與分布式發(fā)電系統(tǒng)正常運行。以此為基礎(chǔ),提出了基于電壓源控制的DFIG并網(wǎng)MPPT運行控制算法,以盡量提高系統(tǒng)風(fēng)能利用效率。 為應(yīng)對不平衡的運行條件,提出了改進(jìn)的ISFO控制,以滿足DFIG孤島單機(jī)運行帶不平衡本地負(fù)荷的需要。而針對含DFIG風(fēng)電機(jī)組分布式發(fā)電系統(tǒng)多機(jī)孤島并聯(lián)運行的不平衡工況,以實現(xiàn)負(fù)序電流的合理分配和系統(tǒng)公共節(jié)點電壓不平衡度的降低為目的,通過負(fù)序下垂引入虛擬電導(dǎo),改善了系統(tǒng)負(fù)序回路阻抗特性,最終達(dá)成控制目標(biāo)的實現(xiàn)。 針對分布式發(fā)電系統(tǒng)中DFIG風(fēng)電機(jī)組運行控制技術(shù)的相關(guān)理論研究,基于MATLAB/Simulink仿真軟件,搭建了DFIG由單機(jī)到系統(tǒng)的仿真模型,驗明了所提系列控制算法在與之對應(yīng)的運行工況或平衡、不平衡條件下的適應(yīng)能力。最后通過建立DFIG風(fēng)電機(jī)組硬件實驗平臺,協(xié)同中央控制器和儲能硬件實驗平臺驗證了部分工況下所提DFIG控制算法的實際可行性,為相關(guān)工作的繼續(xù)開展奠定了較為良好的基礎(chǔ)。
[Abstract]:With the development of new energy generation technology, the grid-connected operation control of DFIGG wind turbine based on current source output has been deeply studied and applied. The current source control technology of DFIG wind turbine which depends on the stable public power grid will greatly restrict its configuration in the distributed generation system. In order to realize the flexible and effective intervention of DFIG wind turbine in distributed generation system, the output characteristics of the voltage source are established by applying the indirect stator flux oriented DFIG control strategy to the DFIG converter. The distance angle control algorithm of wind turbine is designed to meet the need of isolated island single machine operation. Secondly, considering that the distributed system is generally composed of multi-unit parallel connection, The droop control is introduced to construct the power allocation mechanism of DFIG in collaboration with other distributed generation units, which provides a channel to participate in the parallel operation of isolated islands of distributed generation system. At the same time, the coordination ability of ISFO and droop control algorithm is tested. The small disturbance mathematical model of DFIG electrical part is established, and the influence of key control parameters on DFIG control system is analyzed, which provides the necessary criterion for the stability of wind turbine. In order to meet the needs of grid-connected operation and seamless switching of working mode in distributed generation system, the common node voltage frequency is based on the secondary regulation mode of power system, respectively. Voltage amplitude-feedback and output power feedback of generating unit establish the control mechanism of isolated operation point and grid-connected output power of distributed generation system. The DFIG can participate in the normal operation of the distributed generation system under the condition that the hardware topology and the control algorithm remain consistent. Based on this, a novel MPPT operation control algorithm based on voltage source control for DFIG connected to the grid is proposed. In order to improve the system wind energy efficiency. In order to deal with the unbalanced operation conditions, an improved ISFO control is proposed to meet the needs of DFIG isolated island single machine operation with unbalanced local load. In order to realize the reasonable distribution of negative sequence current and the reduction of voltage imbalance degree of common node, the virtual conductance is introduced into the negative sequence droop, which improves the impedance characteristic of the negative sequence loop of the system, and finally achieves the control goal. Aiming at the related theory research of DFIG wind turbine operation control technology in distributed generation system, the simulation model of DFIG from single machine to system is built based on MATLAB/Simulink simulation software. The adaptability of the proposed series of control algorithms under the corresponding operating conditions, balance and unbalance is verified. Finally, the hardware experimental platform of DFIG wind turbine is established. The practical feasibility of the proposed DFIG control algorithm is verified by cooperating with the central controller and the experimental platform of energy storage hardware, which lays a good foundation for the related work to continue.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM61

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本文編號：1526775