共查询到19条相似文献,搜索用时 830 毫秒
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《可再生能源》2017,(1)
基于光伏并网发电系统直流母线电压恒定的特点,定义了一个由光伏电池输出电流和Boost变换器占空比表示的等效功率,根据该等效功率与Boost变换器占空比的关系深入分析了一种无电压传感器最大功率点跟踪(MPPT)算法。为了实现变步长跟踪以保证MPPT算法的快速性,将模糊控制与无电压传感器MPPT算法相结合,改善了系统的动态特性。基于Matlab/Simulink平台搭建了光伏并网发电系统模型,将该算法与传统的扰动观测法进行比较,结果表明,在保证稳态精度的基础上,基于模糊控制的无电压传感器MPPT算法具有更快的跟踪速度,并在光照强度和温度变化的条件下证明了该算法具有更好的鲁棒性。 相似文献
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太阳能光伏发电最大功率点间接跟踪算法研究 总被引:5,自引:2,他引:3
针对太阳能光伏发电最大功率传统跟踪算法的跟踪对象为光伏阵列的输出功率,通过改变跟踪对象,提出了MPPT参数β跟踪与双电压跟踪法,分析了间接跟踪算法的原理特点和实现方案.在分析太阳能电池等效电路模型的基础上,建立了太阳能电池阵列的数学模型,通过MPPT仿真实验验证了此二种间接跟踪算法可行有效,供借鉴. 相似文献
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《太阳能学报》2014,(10)
针对光伏系统最大功率点跟踪(MPPT)传统算法的不足,提出一种改进的人工鱼群算法(IAFSA),该算法将扰动观察法(PO)引入到人工鱼群算法。首先利用扰动观察法实时性强和跟踪快速的特点找到系统的最大功率点,然后由人工鱼群算法对全局最大功率点进行快速搜索跟踪,确定功率点极值,避免了扰动观察法使功率最大点陷入局部极值的问题。应用Matlab仿真,分别以标准环境温度下光照均匀和光照部分被遮蔽以及不同环境温度下光照部分被遮蔽3种条件对IAFSA与传统的PO和PSO算法最大功率点跟踪效果进行比较,仿真结果表明,采用IAFSA算法可有效跟踪光伏系统的最大功率点,提高系统的应用效率。 相似文献
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When designing a maximum power point tracking (MPPT) algorithm, it is often difficult to correctly predict, before field testing, the behavior of this MPPT under varying solar irradiation on photovoltaic (PV) panels. A solution to this problem is to design a maximum power point trackers simulator of a PV system used to test MPPT algorithms. This simulator must have the same role as the MPPT card of the PV panel and thus will fully emulate the response of a real MPPT card of the PV panel. Therefore, it is a good substitute to help to test the peak power trackers of the PV system in the laboratory. This paper describes a simple peak power trackers simulator of the PV system which has a short response time thus, can be used to test MPPT algorithms under very rapid variation condition. The obtained results and the theoretical operation confirm the reliability and the superior performance of the proposed model. 相似文献
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To increase the output efficiency of a photovoltaic (PV) system, it is important to apply an efficient maximum power point tracking (MPPT) technique. This paper describes the analysis, the design and the experimental implementation of the tracking methods for a stand-alone PV system, using two approaches. The first one is the constant voltage (CV) MPPT method based on the optimum voltage, which was deduced experimentally, and considered as a reference value to extract the optimum power. The second one is the increment conductance (Inc-Cond) MPPT method based on the calculation of the power derivative extracted by the installation. The output controller can adjust the duty ratio to the optimum value. This optimum duty ratio is the input of a DC/DC boost converter which feeds a set of Moto-pump via a DC/AC inverter. This paper presents the details of the two approaches implemented, based on the system performance characteristics. Contributions are made in several aspects of the system, including converter design, system simulation, controller programming, and experimental setup. The MPPT control algorithms implemented extract the maximum power point (MPP), with satisfactory performance and without steady-state oscillation. MATLAB/Simulink and dSpace DS1104 are used to conduct studies and implement algorithms. The two proposed methods have been validated by implementing the performance of the PV pumping systems installed on the roof of the research laboratory in INSAT Tunisia. Experimental results verify the feasibility and the improved functionality of the system. 相似文献
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A. Zegaoui M. Aillerie P. Petit J.P. Sawicki J.P. Charles A.W. Belarbi 《Solar Energy》2011,85(11):2953-2964
Maximum power point trackers (MPPTs) have a decisive role to extract power from the photovoltaic (PV) generators as they have to assume the maximum power output (MPP) whatever are the continuous changes of temperature and irradiation conditions. Therefore, they take a prior place in the global PV system efficiency. These trackers are driven by MPPT algorithms and lot of these MPPT algorithms are proposed in literature. The two most common implemented algorithms for power optimisation are the Perturb and Observe (P&O) and the Incremental of Conductance (IncCond) algorithms, which present a high simplicity of implementation within electronics programmable circuits. With an approach based on realistic parameters such as those found when the generator is integrated in a real photovoltaic installation, the two MPPT techniques are dynamically compared using testing procedures developed with Matlab/Simulink. The study leads us to conclude that both algorithms can be performed for PV exposures in unfavourable but realistic external conditions. 相似文献
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This work presents an experimental comparison of two algorithms developed in order to maximize the output power from a photovoltaic (PV) system for the same given set of conditions. The maximum power point tracking (MPPT) methods proposed in this study are two extended algorithms: Perturb and Observe and Incremental Conductance. The numerical modelling of the PV system shows the MPPT interest and then the extended MPPT algorithms are highlighted. In this paper, a PV system based on a boost converter as MPPT device is considered. A programmable DC electronic load is fed by two identical PV systems in which the MPPT control converter algorithms are different. This experimental platform operates under the same conditions such as changing solar radiation and cell temperature. The experimental results obtained with a dSPACE controller board show the MPPT energy efficiency of the proposed algorithms. 相似文献
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Wu Libo Zhao Zhengming Liu Jianzheng 《Energy Conversion, IEEE Transaction on》2007,22(4):881-886
Single-stage grid-connected photovoltaic (PV) systems have advantages such as simple topology, high efficiency, etc. However, since all the control objectives such as the maximum power point tracking (MPPT), synchronization with the utility voltage, and harmonics reduction for output current need to be considered simultaneously, the complexity of the control scheme is much increased. This paper presents the implementation of a single-stage three-phase grid-connected PV system. In addition to realize the aforementioned control objectives, the proposed control can also remarkably improve the stability of the MPPT method with a modified incremental conductance MPPT method. The reactive power compensation for local load is also realized, so as to alleviate grid burden. A DSP is employed to implement the proposed MPPT controller and reactive power compensation unit. Simulation and experimental results show the high stability and high efficiency of this single-stage three-phase grid-connected PV system. 相似文献
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Geethanjali PURUSHOTHAMAN Vimisha VENUGOPALAN Aleena Mariya VINCENT 《Frontiers in Energy》2013,7(3):373
Recently, real-time simulation of renewable energy sources are indispensible for evaluating the performance of the maximum power point tracking (MPPT) controller, especially in the photovoltaic (PV) system in order to reduce cost in the testing phase. Nowadays, real time PV simulators are obtained by using analog and/or digital components. In this paper, a real-time simulation of a PV system with a boost converter was proposed using only the digital signal processor (DSP) processor with two DC voltage sources to emulate the temperature and irradiation in the PV system. A MATLAB/Simulink environment was used to develop the real-time PV system with a boost converter into a C-program and build it into a DSP controller TMS320F28335. Besides, the performance of the real-time DSP-based PV was tested in different temperature and irradiation conditions to observe the P-V and V-I characteristics. Further, the performance of the PV with a boost converter was tested at different temperatures and irradiations using MPPT algorithms. This scheme was tested through simulation and the results were validated with that of standard conditions given in the PV data sheets. Implementation of this project helped to attract more researchers to study renewable energy applications without real sources. This might facilitate the study of PV systems in a real-time scenario and the evaluation of what should be expected for PV modules available in the market. 相似文献
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In photovoltaic (PV) applications, a maximum power point tracking (MPPT) module is necessary to extract the whole energy that the PV module can generate depending on the instantaneous conditions of the PV system. A PV module is obtained by connecting a number of solar cells in series and parallel, which causes voltage and current to increase at module terminations. The present work is based on a three-phase grid-connected inverter designed for a 100 kW PV power plant that uses an MPPT scheme based on fuzzy logic controllers. The whole system presented is simulated in MATLAB. The fuzzy logic-based MPPT controllers show accurate and fast responses and are integrated into the inverter, so that the there is no requirement for a dc–dc converter. The inverter allows full control of reactive power. 相似文献
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This paper proposes maximum photovoltaic power tracking (MPPT) for the photovoltaic (PV) array using the fractional-order incremental conductance method (FOICM). Since the PV array has low conversion efficiency, and the output power of PV array depends on the operation environments, such as various solar radiation, environment temperature, and weather conditions. Maximum charging power can be increased to a battery using a MPPT algorithm. The energy conversion of the absorbed solar light and cell temperature is directly transferred to the semiconductor, but electricity conduction has anomalous diffusion phenomena in inhomogeneous material. FOICM can provide a dynamic mathematical model to describe non-linear characteristics. The fractional-order incremental change as dynamic variable is used to adjust the PV array voltage toward the maximum power point. For a small-scale PV conversion system, the proposed method is validated by simulation with different operation environments. Compared with traditional methods, experimental results demonstrate the short tracking time and the practicality in MPPT of PV array. 相似文献