本文選題：分布式光伏發(fā)電系統(tǒng) + 諧波檢測�。� 參考：《沈陽農(nóng)業(yè)大學(xué)》2017年碩士論文

【摘要】：隨著能源問題和環(huán)境問題的日益突出,清潔可再生能源開始備受關(guān)注,太陽能以其綠色資源豐富等優(yōu)勢成為最有發(fā)展前景的新能源之一,隨之,光伏發(fā)電也開始逐漸占據(jù)發(fā)電市場,成為緩解能源問題的方法之一,但光伏發(fā)電系統(tǒng)中存在的電力電子器件,會在發(fā)電并網(wǎng)過程中帶來諧波問題,導(dǎo)致傳統(tǒng)電網(wǎng)的電能質(zhì)量下降,所以,如何抑制光伏并網(wǎng)系統(tǒng)中的諧波問題,是光伏并網(wǎng)系統(tǒng)研究的重點內(nèi)容之一。本課題基于分布式光伏發(fā)電系統(tǒng)的構(gòu)成及工作原理,分析分布式光伏發(fā)電系統(tǒng)諧波產(chǎn)生機理,繼而全面對分布式光伏發(fā)電系統(tǒng)的諧波檢測和抑制的方法展開探究。以某一沿海地區(qū)實例為研究對象,收集實例運行數(shù)據(jù),結(jié)合溫度和日照分析光伏發(fā)電系統(tǒng)發(fā)電特征,并檢測該系統(tǒng)運行時的各次諧波參量,以公用電網(wǎng)標(biāo)準(zhǔn)衡量其電能質(zhì)量,并針對其諧波問題,提出搭建具有有源濾波器功能的光伏并網(wǎng)系統(tǒng)。在課題研究過程中,比較基于傅里葉變換和瞬時無功理論的諧波檢測方法,對于基于傅里葉變換在檢測光伏發(fā)電系統(tǒng)諧波中存在頻譜混疊、柵欄效應(yīng)、頻譜泄露等問題,通過加Hanning窗和全相位快速傅里葉變換進行改善,對于既能檢測諧波又能補償無功的瞬時無功理論諧波檢測方法,比較其P-q和i_p-i_q兩種諧波檢測方法,選擇在有電壓畸變情況下檢測準(zhǔn)確度高的i_p-i_q檢測法。根據(jù)有源電力濾波器和光伏并網(wǎng)發(fā)電的結(jié)構(gòu)及工作原理的異同點,提出將分布式光伏發(fā)電系統(tǒng)與有源電力濾波器有機結(jié)合,構(gòu)建具有有源濾波器功能的光伏并網(wǎng)系統(tǒng),同時實現(xiàn)光伏并網(wǎng)和諧波與無功補償,針對系統(tǒng)中的直流側(cè)電壓、指令電流合成和電流跟蹤逆變器等三個主要組成部分的控制方法進行選擇和設(shè)計,并在MATLAB/Simulink仿真平臺上搭建了仿真模型驗證其可行性和正確性。
[Abstract]:With the increasingly prominent energy and environmental problems, clean and renewable energy began to receive much attention. Solar energy has become one of the most promising new energy sources because of its rich green resources. Photovoltaic power generation is also gradually occupying the power generation market, as one of the ways to alleviate the energy problem, but the existence of power electronic devices in the photovoltaic power system will bring harmonic problems in the process of grid connection. Therefore, how to suppress the harmonic in photovoltaic grid-connected system is one of the most important issues in the research of grid-connected photovoltaic system. Based on the structure and working principle of distributed photovoltaic system, the harmonic generation mechanism of distributed photovoltaic system is analyzed, and the methods of harmonic detection and suppression in distributed photovoltaic system are studied. Taking an example of a coastal area as the research object, collecting the operation data of the example, analyzing the characteristics of photovoltaic power generation system combined with temperature and sunshine, and detecting the harmonic parameters of the system, the power quality of the photovoltaic system is measured according to the standard of public power network. Aiming at the harmonic problem, a photovoltaic grid-connected system with active filter function is proposed. In the course of the research, the harmonic detection methods based on Fourier transform and instantaneous reactive power theory are compared. There are problems such as spectrum aliasing, fencing effect and spectrum leakage in detecting harmonics of photovoltaic power system based on Fourier transform. By adding Hanning window and all phase fast Fourier transform, the harmonic detection method of instantaneous reactive power theory, which can detect harmonics and compensate reactive power, is compared between P-q and i_p-i_q harmonic detection methods. Select the i_p-i_q detection method with high accuracy under the condition of voltage distortion. According to the similarities and differences of the structure and working principle of active power filter (APF) and photovoltaic grid-connected generation, a photovoltaic grid-connected system with the function of active power filter (APF) is constructed by combining the distributed photovoltaic system (DPV) and active power filter (APF) organically. At the same time, the photovoltaic grid-connected and harmonic and reactive power compensation are realized. The control methods of three main components of DC side voltage, instruction current synthesis and current tracking inverter are selected and designed. A simulation model is built on the MATLAB/Simulink platform to verify its feasibility and correctness.
【學(xué)位授予單位】：沈陽農(nóng)業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM615;TM935
，

本文編號：1827094