本文選題：分布式光伏電源 + 低電壓穿越�。� 參考：《南京理工大學(xué)》2017年碩士論文

【摘要】：近年來(lái),利用太陽(yáng)能的光伏發(fā)電技術(shù)得到了快速的發(fā)展,并且在商業(yè)和工業(yè)化應(yīng)用中日趨成熟。預(yù)計(jì)在未來(lái)的幾年內(nèi),我國(guó)電網(wǎng)中光伏電源的數(shù)量將大幅增長(zhǎng)。然而,大量分布式光伏電源的接入會(huì)給配電網(wǎng)的安全穩(wěn)定運(yùn)行帶來(lái)一些不利的影響。傳統(tǒng)的配電網(wǎng)保護(hù)無(wú)法適用于含分布式光伏電源的配電網(wǎng),可能產(chǎn)生誤動(dòng)或者拒動(dòng)。分析了光伏并網(wǎng)逆變器基于電網(wǎng)電壓定向的控制策略,并根據(jù)國(guó)內(nèi)外對(duì)光伏并網(wǎng)發(fā)電系統(tǒng)的低電壓穿越的技術(shù)要求,研究了基于無(wú)功電流支撐的光伏并網(wǎng)系統(tǒng)低電壓穿越控制策略。該控制策略能夠保證光伏電源在并網(wǎng)點(diǎn)電壓跌落時(shí)的輸出電流不過(guò)流,并向電網(wǎng)提供一定無(wú)功功率,同時(shí),根據(jù)光伏并網(wǎng)系統(tǒng)的低電壓穿越控制策略建立了光伏電源的短路計(jì)算模型。基于光伏電源的壓控電流源等效模型,分析了含分布式光伏電源的配電網(wǎng)的故障特性,研究了含分布式光伏電源的配電網(wǎng)故障分析方法。通過(guò)仿真驗(yàn)證了該故障分析方法能夠正確計(jì)算含分布式光伏電源配電網(wǎng)中故障電流的大小與相位。根據(jù)含光伏電源配電網(wǎng)的故障特性,分析了分布式光伏電源的接入對(duì)配電網(wǎng)傳統(tǒng)方向元件的影響,并在此基礎(chǔ)上研究了適用于含分布式光伏電源配電網(wǎng)的方向元件判據(jù),通過(guò)仿真驗(yàn)證了該方向元件判據(jù)的有效性。最后,在能正確判別故障方向的基礎(chǔ)上,提出了適用于含多個(gè)光伏電源的配電網(wǎng)自適應(yīng)正序電流速斷保護(hù)。通過(guò)仿真驗(yàn)證了該保護(hù)方案可根據(jù)光伏電源容量、發(fā)生故障位置的不同,實(shí)現(xiàn)自適應(yīng)在線保護(hù)整定,能夠有效提高本地保護(hù)范圍,有較好的實(shí)用性。
[Abstract]:In recent years, solar photovoltaic power generation technology has been rapid development, and in commercial and industrial applications are increasingly mature. In the next few years, the number of photovoltaic power supply in China's power grid is expected to increase significantly. However, the access of a large number of distributed photovoltaic power sources will bring some adverse effects to the safe and stable operation of the distribution network. Traditional distribution network protection can not be applied to distribution network with distributed photovoltaic power, which may cause maloperation or rejection. This paper analyzes the control strategy of grid-connected photovoltaic inverter based on grid voltage orientation, and according to the technical requirements of low-voltage traversing of photovoltaic grid-connected generation system at home and abroad. The low voltage traversing control strategy of photovoltaic grid-connected system based on reactive current support is studied. The control strategy can ensure that the output current of photovoltaic power supply is not only current but also provide a certain amount of reactive power to the power grid, at the same time, According to the low voltage traversing control strategy of photovoltaic grid-connected system, the short-circuit calculation model of photovoltaic power supply is established. Based on the equivalent model of voltage-controlled current source of photovoltaic power supply, the fault characteristics of distribution network with distributed photovoltaic power supply are analyzed, and the fault analysis method of distribution network with distributed photovoltaic power source is studied. The simulation results show that the fault analysis method can correctly calculate the magnitude and phase of the fault current in the distribution network with distributed photovoltaic power. According to the fault characteristics of distribution network with photovoltaic power supply, the influence of the access of distributed photovoltaic power source on the traditional directional elements of distribution network is analyzed, and the criterion of directional component suitable for distribution network with distributed photovoltaic power source is studied. The validity of the criterion is verified by simulation. Finally, based on the correct identification of fault direction, an adaptive positive sequence current fast break protection is proposed for distribution network with multiple photovoltaic sources. The simulation results show that the protection scheme can realize adaptive on-line protection setting according to the capacity of photovoltaic power supply and the different fault location. It can effectively improve the local protection range and has good practicability.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM77

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本文編號(hào)：2014965