【摘要】：隨著傳統(tǒng)石化能源儲量的匱乏和環(huán)境問題的日益嚴重,光伏并網(wǎng)發(fā)電行業(yè)在全世界范圍內(nèi)得到迅猛地發(fā)展。大容量光伏并網(wǎng)是新能源發(fā)展的主流。隨著大容量光伏發(fā)電系統(tǒng)廣泛投入運行,一些問題接踵而至,其中低電壓穿越問題被認為是光伏并網(wǎng)設(shè)備設(shè)計制造控制技術(shù)上的最大挑戰(zhàn)之一,直接關(guān)系到光伏發(fā)電的大規(guī)模應(yīng)用。 本文主要圍繞光伏并網(wǎng)逆變器在電網(wǎng)對稱故障、不對稱故障時的低電壓穿越控制策略展開研究。首先,得出并網(wǎng)逆變器在三相ABC靜止坐標系下的數(shù)學(xué)模型,并通過PARK變換得到兩相dq旋轉(zhuǎn)坐標系下的數(shù)學(xué)模型。其次,當(dāng)電網(wǎng)發(fā)生三相對稱跌落時,提出了基于電壓定向矢量控制的低電壓穿越控制策略,結(jié)合直流卸荷電路,保證在電網(wǎng)發(fā)生故障時光伏并網(wǎng)發(fā)電系統(tǒng)的穩(wěn)定運行。最后,對光伏并網(wǎng)逆變器在電網(wǎng)電壓不對稱跌落時的運行特性進行了研究,提出了基于預(yù)測電流控制的低電壓穿越控制策略,針對該策略中的正、負序分量的分離與檢測提出了雙二階廣義積分的控制方法,從而保證光伏并網(wǎng)發(fā)電系統(tǒng)在電網(wǎng)故障時繼續(xù)并網(wǎng)運行,實現(xiàn)低電壓穿越。 本文采用仿真軟件PSCAD/EMTDC搭建了額定功率為3MW的光伏并網(wǎng)發(fā)電系統(tǒng)模型,來驗證提出的LVRT控制策略。仿真結(jié)果證明所提控制策略的有效性,當(dāng)電網(wǎng)故障時,直流側(cè)電壓波動得以抑制,光伏發(fā)電系統(tǒng)根據(jù)電壓跌落深度補償一定的無功功率以恢復(fù)電壓,系統(tǒng)保持穩(wěn)定運行。
[Abstract]:With the shortage of traditional petrochemical energy reserves and the increasingly serious environmental problems, photovoltaic grid-connected power generation industry has been rapidly developed in the world. Large-capacity photovoltaic grid-connected is the mainstream of new energy development. With the wide operation of large capacity photovoltaic power generation system, some problems have arisen. Among them, the low-voltage traversing problem is considered as one of the biggest challenges in the design and manufacturing control technology of photovoltaic grid-connected equipment. It is directly related to the large-scale application of photovoltaic power generation. This paper focuses on the low voltage traversing control strategy of photovoltaic grid-connected inverter when the grid is symmetrical fault or asymmetric fault. Firstly, the mathematical model of grid-connected inverter in three-phase ABC stationary coordinate system is obtained, and the mathematical model of two-phase dq rotating coordinate system is obtained by PARK transformation. Secondly, when the three-phase symmetrical drop occurs, a low-voltage traversing control strategy based on voltage oriented vector control is proposed, which combines DC unloading circuit to ensure the stable operation of photovoltaic grid-connected generation system in the event of power grid failure. Finally, the operating characteristics of photovoltaic grid-connected inverter under asymmetric drop of grid voltage are studied, and a low-voltage traversing control strategy based on predictive current control is proposed. A control method based on double second order generalized integral is proposed for the separation and detection of negative sequence components, which ensures that photovoltaic grid-connected generation system continues to run grid-connected when the power network fails, and realizes low voltage traversing. In this paper, a photovoltaic grid-connected power generation system model with rated power of 3MW is built by using the simulation software PSCAD/EMTDC to verify the proposed LVRT control strategy. The simulation results show that the proposed control strategy is effective. When the power network fails, the DC side voltage fluctuation can be restrained, and the photovoltaic power generation system compensates a certain reactive power according to the voltage drop depth to recover the voltage, and the system runs stably.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM615

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