共查询到19条相似文献,搜索用时 62 毫秒
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为了获得风光互补系统最大功率的目的,在此采用了极值搜索的基本方法。依据风机和光伏阵列具有相同的功率曲线,采用双乘法,根据导数的结果判断是否达到最大值。该算法基于扰动的基础上运用到最大功率跟踪系统。基于极值搜索法的最大功率跟踪控制的稳定性分析是为风光互补系统提供一个直流控制的转换器。运用Matlab进行仿真结果分析,获得了功率曲线图,证明采用极值搜索法,根据电压电流曲线图可以达到功率最大值。风光互补系统的最大功率跟踪控制的特点是稳态行为在最大功率点附近稳定地振荡。 相似文献
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太阳能电池最大功率点跟踪技术研究 总被引:1,自引:0,他引:1
在太阳能LED路灯照明系统中,为了提高系统的整体效率,应实时检测太阳能电池的输出功率,保证太阳能电池始终工作在最大功率点上。文中介绍了太阳能电池的输出特性和最大功率点跟踪的原理,分析了常用的固定电压法、扰动观察法、电导增量法等跟踪方法。并针对传统算法中存在的跟踪速度慢、振荡现象等问题,提出了一种新的算法,将固定电压法和扰动观察法结合起来,利用两者各自的优势,实现快速跟踪,进一步提高太阳能电池的利用效率。 相似文献
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光伏并网逆变器最大功率点的跟踪控制 总被引:2,自引:0,他引:2
本文通过对太阳能电池的伏安特性及功率电压曲线的分析,给出了太阳能电池最大输出功率点的跟踪方法.通过分析比较,得出在光强变化较快的情况下光伏并网逆变器迅速跟踪最大功率点的方法. 相似文献
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Maximum power point trackers (MPPTs) play an important role in photovoltaic (PV) power systems because they maximize the power output from a PV system for a given set of conditions, and therefore maximize the array efficiency. Thus, an MPPT can minimize the overall system cost. MPPTs find and maintain operation at the maximum power point, using an MPPT algorithm. Many such algorithms have been proposed. However, one particular algorithm, the perturb‐and‐observe (P&O) method, claimed by many in the literature to be inferior to others, continues to be by far the most widely used method in commercial PV MPPTs. Part of the reason for this is that the published comparisons between methods do not include an experimental comparison between multiple algorithms with all algorithms optimized and a standardized MPPT hardware. This paper provides such a comparison. MPPT algorithm performance is quantified through the MPPT efficiency. In this work, results are obtained for three optimized algorithms, using a microprocessor‐controlled MPPT operating from a PV array and also a PV array simulator. It is found that the P&O method, when properly optimized, can have MPPT efficiencies well in excess of 97%, and is highly competitive against other MPPT algorithms. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
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风力发电系统的输出功率受外界因数和风速的影响。为了提高小型风机发电机组的转换效率,文中采用一种最大功率优化跟踪算法。以变步长来跟踪风速变化,当功率变化小于一个阈值时停止搜索,来实现最大功率收索的快速性和稳定性。以带齿轮箱6 kW的鼠笼异步式风力发电并网为基础,通过Matlab/Simulink软件仿真结果证实此种方法与定步长爬山法相比,能够达到快速跟踪最大功率点和避免达到最大功率点附近的时候频繁波动。 相似文献
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设计了一种针对多峰值的最大功率追踪算法。光伏板在受到不均匀光照的情况下,其功率-电流特性曲线会出现多峰值。通过大量光伏电池的数据模拟,发现光伏板P-I曲线具有峰值高度以全局峰值为中心,向两侧不断递减的重要规律,并且统计研究了P-I曲线上左侧坡和右侧坡的斜率、相邻峰值间隔等多种数据,以此作为算法设计的依据。设计的算法通过对光伏电池的输出曲线进行部分扫描来获得全局峰值的位置,其中运用了区域扫描法来增强扫描的精度和速度。另外对两种简单、快速的变步长扰动观察法法进行了比较,确定了其适用范围并加以灵活运用。所设计的算法快速、有效,避免了峰值的遗漏,而且具有峰值越多,追踪越快的特点。 相似文献
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《Progress in Photovoltaics: Research and Applications》2017,25(11):942-950
The surge of the power conversion efficiency of metal halide lead perovskite solar cells comes with concerns, such as the long‐term ecotoxicity of lead compounds, their sensitivity toward moisture and oxygen, or the scarcity of some of their components. Most perovskite solar cells still suffer from serious stability problems when measured under real working conditions (maximum power point tracking at 60°C). In the long run, stability will certainly decide on the fate of CH3NH3PbI3 and related lead perovskites for their use in photovoltaic modules. Herein, we show an effective and inexpensive strategy to perform ageing of perovskite solar cells under maximum power point tracking. For the first time, we analyze the issue of power extraction from solar cells exhibiting hysteresis. We show that a standard tracking algorithm such as perturb and observe fails to converge to the maximum power point of the solar cell if it exhibits j (V ) hysteresis, and we present an effective strategy to stabilize the algorithm. We show that enforcing oscillations in forward bias can boost the mean power output of some perovskite solar cells by more than 10%, in contrast to a reference crystalline silicon solar cell. Copyright © 2017 John Wiley & Sons, Ltd. 相似文献
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The power generation demand is increasing day-by-day throughout the world, therefore, the use of hybrid systems becomes a significant solution. The hybrid renewable energy system (HRES) is used for delivering power in various regions in order to overcome intermittence of wind and solar resources. Because of increasing environmental problems, for example, greenhouse gas emission and energy cost have interested novel research into substitute methods in favour of electrical power generation. Maximum Power Point Tracking (MPPT) control method is a vast deal of novel research used for enhancing the efficiency of HRES. The authors have revealed that the hybrid techniques i.e. Global MPPT, fuzzy-neuro systems, Adaptive Neuro-Fuzzy Inference System (ANFIS), Perturbed and Observe (P&O) + Adaptive Neural Network (ANN) etc. can provide best results as compared to other MPPT control methods. This paper offering a state of art review of MPPT control techniques for HRES. 相似文献
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根据太阳能光伏电池的等效电路特点,建立了相应的光伏电池组件的仿真模型。该模型可以实现在不同光照强度和温度下光伏组件的输出特性,在此模型基础上研究了光伏组件最大功率追踪方法(MPPT)。在众多最大功率追踪方法中,扰动法有着比较优秀的控制效果。针对最常用的最大功率点跟踪方法-扰动观察法,提出一种改进型的扰动法算法,通过仿真结果和实验证明该方法在一定程度上可解决光伏电池输出非线性的问题,有效避免跟踪偏差,提高光伏电池的输出效率,且动态响应速度快,使光伏系统具有良好的动态和稳态性能。 相似文献
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Mohammad Sarvi Saeedeh Ahmadi Shirzad Abdi 《Progress in Photovoltaics: Research and Applications》2015,23(2):201-214
To increase the efficiency of photovoltaic (PV) systems, maximum power point (MPP) tracking of the solar arrays is needed. Solar arrays output power depends on the solar irradiance and temperature. Also the mismatch phenomenon caused by partial shade will affect the output power of solar systems and lead to the incorrect operation of conventional MPP tracker. Under partially shaded conditions, the solar array power–current characteristic has multiple maximum. This paper presents a maximum power point tracking (MPPT) with particle swarm optimization method for PV systems under partially shaded condition. The performance of the proposed method is compared with perturb and observe (P&O), improved P&O, voltage‐based maximum power point tracking and current‐based maximum power point tracking algorithms, especially, under partially shaded condition. Simulation results confirm that proposed MPPT algorithm with high accuracy can track the peak power point under different insolation, temperature and partially shaded conditions, and it has the best performance in comparison with four mentioned MPPT algorithms. Also under rapidly changing atmospheric conditions, the P&O algorithm is diverged. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献