【摘要】：近年來,隨著能源危機(jī)和環(huán)境問題的日益突出,開發(fā)一種新的能源顯得刻不容緩。太陽能逐漸成為許多國家爭相研究的重點(diǎn),當(dāng)前對太陽能的利用形式很多,其中最前沿也是最有發(fā)展前景的是光伏發(fā)電。本文主要是關(guān)于10kW光伏并網(wǎng)逆變控制系統(tǒng)的研究,著重分析了并網(wǎng)型逆變系統(tǒng)的結(jié)構(gòu)及其控制策略,并利用樣機(jī)進(jìn)行了實(shí)驗(yàn)分析。 本文首先充分分析了光伏電池的外特性,并對常見的幾種MPPT控制策略進(jìn)行分析比較。提出了基于模型參考電導(dǎo)增量法的MPPT控制策略,提高了跟蹤速度及控制精度,更快更穩(wěn)的對光伏電池的最大功率點(diǎn)進(jìn)行實(shí)時(shí)跟蹤。其次,對并網(wǎng)發(fā)電系統(tǒng)的主電路結(jié)構(gòu)進(jìn)行了詳細(xì)設(shè)計(jì)。前級的DC/DC升壓部分采用了一種雙Boost升壓斬波器,該結(jié)構(gòu)運(yùn)用了交錯(cuò)并聯(lián)控制技術(shù),從而大大減小了電流紋波幅值,提高了開關(guān)頻率；后級的DC/AC逆變部分用到了IPM模塊6MBP50RA120,內(nèi)含三相全橋逆變電路,并采用虛擬磁鏈定向控制技術(shù)進(jìn)行控制。對并網(wǎng)逆變器的軟硬件進(jìn)行了系統(tǒng)的設(shè)計(jì),主要是針對其輔助電源、檢測電路和控制電路部分,控制電路中采用了DSP2407對系統(tǒng)進(jìn)行實(shí)時(shí)控制；針對光伏發(fā)電常見的孤島效應(yīng)問題,提出了一種基于正反饋的主動(dòng)頻移反孤島策略。并對其進(jìn)行仿真分析,驗(yàn)證了該策略檢測速度更快。 最后,依托實(shí)驗(yàn)室現(xiàn)有的10kW光伏并網(wǎng)發(fā)電系統(tǒng),通過分析實(shí)驗(yàn)波形,驗(yàn)證了本文所提出的控制策略的可行性和有效性。
[Abstract]:In recent years, with the increasingly prominent energy crisis and environmental problems, it is urgent to develop a new energy source. Solar energy has gradually become the focus of research in many countries. At present, there are many forms of solar energy utilization, among which photovoltaic power generation is the most advanced and the most promising. This paper is mainly about the research of 10kW photovoltaic grid-connected inverter control system. The structure and control strategy of grid-connected inverter system are analyzed emphatically, and the experimental analysis is carried out by using the prototype. In this paper, the external characteristics of photovoltaic cells are analyzed, and several common MPPT control strategies are analyzed and compared. The MPPT control strategy based on the model reference conductance increment method is proposed to improve the tracking speed and control accuracy and to track the maximum power point of the photovoltaic cell more quickly and steadily in real time. Secondly, the main circuit structure of grid-connected generation system is designed in detail. A double Boost boost chopper is used in the DC/DC boost part of the front stage. The structure uses the staggered parallel control technology, which greatly reduces the current ripple amplitude and improves the switching frequency. The IPM module 6MBP50RA120 is used in the DC/AC inverter, which contains three-phase full-bridge inverter circuit and is controlled by virtual flux linkage directional control technology. The hardware and software of grid-connected inverter are designed, mainly aiming at its auxiliary power supply, detection circuit and control circuit. In the control circuit, DSP2407 is used to control the system in real time. Aiming at the problem of islanding effect in photovoltaic power generation, an active frequency shift and inverse islanding strategy based on positive feedback is proposed. The simulation results show that the detection speed of the strategy is faster. Finally, the feasibility and effectiveness of the proposed control strategy are verified by analyzing the experimental waveforms based on the existing 10kW photovoltaic grid-connected power generation system in the laboratory.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM921.5

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本文編號：2363750