【摘要】：隨著光伏發(fā)電在電力系統(tǒng)的滲透率不斷增加，保證電網(wǎng)安全穩(wěn)定運行，建立電網(wǎng)友好型的光伏電站是目前光伏行業(yè)可持續(xù)發(fā)展的重要課題之一。電網(wǎng)友好型要求并網(wǎng)光伏系統(tǒng)不僅能在電網(wǎng)正常運行時保證輸出電能質(zhì)量，而且在電網(wǎng)故障時保證不脫網(wǎng)不損壞逆變器，同時充分利用光伏逆變器的快速無功輸出能力參與電網(wǎng)的有功和無功調(diào)節(jié)，實現(xiàn)故障穿越并提供故障期間無功支持。 本文首先分析了光伏并網(wǎng)系統(tǒng)在電網(wǎng)故障時，特別是三相不對稱故障時的穩(wěn)定性，包括直流母線電壓穩(wěn)定性，輸出有功無功功率穩(wěn)定性以及諧波穩(wěn)定性。 其次，，本文提出三相以及單相光伏并網(wǎng)逆變器低電壓穿越控制系統(tǒng)。重點是針對兩級式三相光伏發(fā)電系統(tǒng)在電網(wǎng)不對稱情況下的表現(xiàn),后級全橋逆變器的并網(wǎng)電流控制以消除有功功率振蕩分量為目標(biāo),并將其與前級DC-DC變換電路控制配合,實現(xiàn)電網(wǎng)不對稱故障下的低電壓穿越。并提出不同的電流環(huán)參考電流生成算法。一是基于雙同步旋轉(zhuǎn)坐標(biāo)系的改進控制算法，二是基于并網(wǎng)三相電流與功率矢量關(guān)系的直接生成算法。 接著，本文完成10kW三相并網(wǎng)光伏系統(tǒng)的直流母線電容選型以及交流側(cè)電感設(shè)計，利用MATLAB/Simulink搭建仿真系統(tǒng)，完成不同故障類型，不同跌落深度下光伏并網(wǎng)故障穿越控制策略的仿真驗證。 最后，依托新能源電力系統(tǒng)國家重點實驗室的實驗平臺，完成對本文所提控制系統(tǒng)的10kW單晶光伏并網(wǎng)逆變系統(tǒng)故障穿越實驗驗證。
[Abstract]:With the increasing permeability of photovoltaic generation in the power system, to ensure the safe and stable operation of the grid, the establishment of a grid-friendly photovoltaic power plant is one of the most important issues for the sustainable development of photovoltaic industry. The grid-friendly photovoltaic system can not only guarantee the output power quality in the normal operation of the power grid, but also ensure that the inverter will not be removed from the grid when the power network fails. At the same time, the fast reactive power output ability of photovoltaic inverter is fully utilized to participate in the active and reactive power regulation of the power network, to realize the fault traversing and to provide reactive power support during the fault period. In this paper, the stability of photovoltaic grid-connected system, especially the three-phase asymmetrical fault, including the stability of DC bus voltage, the stability of output active and reactive power, and the stability of harmonics are analyzed. Secondly, three-phase and single-phase photovoltaic grid-connected inverter low voltage traversing control system is proposed in this paper. Focusing on the performance of two-stage three-phase photovoltaic power generation system under the condition of grid asymmetry, the grid-connected current control of the full-bridge inverter is aimed at eliminating the active power oscillation component, and it is combined with the control of the former stage DC-DC converter circuit. The low voltage traversing is realized under the asymmetrical fault of the power network. Different current loop reference current generation algorithms are proposed. One is an improved control algorithm based on double synchronous rotating coordinate system, the other is a direct generation algorithm based on the relationship between three-phase current and power vector. Then, this paper completes the DC busbar capacitance selection and AC side inductance design of 10kW three-phase grid-connected photovoltaic system, and uses MATLAB/Simulink to build simulation system to complete different fault types. Simulation verification of the control strategy of photovoltaic grid-connected fault crossing under different drop depth. Finally, based on the experimental platform of the State key Laboratory of New Energy Power system, the 10kW single-crystal photovoltaic grid-connected inverter system of the proposed control system is verified.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM615

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