本文選題：大型并網(wǎng)光伏電站　切入點(diǎn)：并網(wǎng)逆變器　出處：《沈陽(yáng)工業(yè)大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：大型并網(wǎng)光伏電站具有集中利用太陽(yáng)能的優(yōu)勢(shì),有利于擴(kuò)大光伏發(fā)電規(guī)模,成為近年來(lái)新能源發(fā)電的重點(diǎn)規(guī)劃和建設(shè)目標(biāo)。隨著大型光伏電站并網(wǎng)容量的加大,大多數(shù)國(guó)家都建立了嚴(yán)格的并網(wǎng)標(biāo)準(zhǔn)來(lái)確保電網(wǎng)安全,故為確保光伏電站的安全穩(wěn)定運(yùn)行,研究光伏電站并網(wǎng)電能質(zhì)量就顯得尤為重要。本文在開(kāi)展光伏并網(wǎng)逆變器基礎(chǔ)研究時(shí),在其理論分析和仿真的基礎(chǔ)上,對(duì)大型并網(wǎng)光伏電站諧波檢測(cè)方法和諧波抑制策略開(kāi)展了研究,具體內(nèi)容如下:(1)并網(wǎng)逆變器諧波機(jī)理研究本文以常用三相光伏并網(wǎng)逆變器作為研究對(duì)象,對(duì)其基本結(jié)構(gòu)和工作原理進(jìn)行了分析,在此基礎(chǔ)上,分析了并網(wǎng)光伏電站兩種常用并網(wǎng)控制策略,并驗(yàn)證了該并網(wǎng)控制方法對(duì)電網(wǎng)背景諧波的擾動(dòng)抑制效果可靠性不高;最后,針對(duì)SPWM調(diào)制模式下的逆變器輸出諧波影響因素進(jìn)行了研究,并總結(jié)其輸出諧波分布概率。(2)諧波電流檢測(cè)方法研究本文基于現(xiàn)階段最具代表性的瞬時(shí)無(wú)功諧波檢測(cè)法和傅里葉諧波檢測(cè)方法,對(duì)其檢測(cè)原理和適用范圍進(jìn)行了分析研究,針對(duì)傅里葉變換實(shí)時(shí)性較差、瞬時(shí)無(wú)功功率檢測(cè)動(dòng)態(tài)響應(yīng)差和檢測(cè)范圍較小的缺陷,本文研究了人工神經(jīng)網(wǎng)絡(luò)(ANN)模型下的自適應(yīng)諧波檢測(cè)算法,對(duì)其基本檢測(cè)原理與數(shù)學(xué)模型進(jìn)行了分析,仿真結(jié)果驗(yàn)證,該方法具有較好的實(shí)時(shí)性和動(dòng)態(tài)性,并能檢測(cè)出任意指定次數(shù)諧波。(3)并網(wǎng)光伏電站諧波抑制方法研究本文為提高光伏電站并網(wǎng)電能質(zhì)量,減小并網(wǎng)電流諧波含量,基于閉環(huán)系統(tǒng)傳遞函數(shù)的輸出阻抗特性,深入分析了電網(wǎng)電壓前饋控制、多諧振控制的諧波抑制機(jī)理及抑制效果;在此基礎(chǔ)上,研究了基于電網(wǎng)電壓前饋和多諧振控制相結(jié)合的組合諧波抑制方法;理論分析和仿真結(jié)果,均驗(yàn)證了組合諧波抑制策略的諧波抑制效果遠(yuǎn)比現(xiàn)有諧波抑制策略能更好地改善光伏電站并網(wǎng)電能質(zhì)量。
[Abstract]:Large-scale grid-connected photovoltaic power plants have the advantages of concentrated utilization of solar energy, which is conducive to expand the scale of photovoltaic power generation and become the key planning and construction target of new energy generation in recent years. With the increase of grid-connected capacity of large-scale photovoltaic power plants, Most countries have established strict grid-connected standards to ensure grid safety, so to ensure the safe and stable operation of photovoltaic power plants, It is particularly important to study the grid-connected power quality of photovoltaic power plants. In this paper, the theoretical analysis and simulation of photovoltaic grid-connected inverters are carried out. The harmonic detection method and harmonic suppression strategy of large-scale grid-connected photovoltaic power station are studied. The main contents are as follows: 1) the harmonic mechanism of grid-connected inverter is studied in this paper, the commonly used three-phase photovoltaic grid-connected inverter is taken as the research object. Based on the analysis of its basic structure and working principle, two common grid-connected control strategies of grid-connected photovoltaic power station are analyzed, and the reliability of the grid-connected control method to restrain the background harmonic disturbance is not high. The factors affecting the output harmonics of the inverter in SPWM modulation mode are studied. In this paper, based on the most representative instantaneous reactive harmonic detection method and Fourier harmonic detection method, the detection principle and applicable range are analyzed and studied. Aiming at the shortcomings of poor real-time performance of Fourier transform, poor dynamic response of instantaneous reactive power detection and small detection range, an adaptive harmonic detection algorithm based on artificial neural network (Ann) model is studied in this paper. The basic detection principle and mathematical model are analyzed, and the simulation results show that the method has good real-time and dynamic characteristics. The harmonic suppression method of grid-connected photovoltaic power station is studied in this paper. In order to improve the power quality of grid-connected photovoltaic power station and reduce the harmonic content of grid-connected current, the output impedance characteristic based on the transfer function of closed-loop system is studied. The harmonic suppression mechanism and effect of voltage feedforward control and multi-resonance control are deeply analyzed, and the combined harmonic suppression method based on the combination of voltage feedforward and multi-resonance control is studied. The theoretical analysis and simulation results show that the harmonic suppression effect of the combined harmonic suppression strategy is much better than that of the existing harmonic suppression strategy.
【學(xué)位授予單位】：沈陽(yáng)工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TM615

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