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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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文中针对太阳能电池最大输出功率点跟踪技术的研究和应用现状,提出了一种基于U(电压)、I(电流)、P(功率)、T(温度)多变量的MPPT协同控制方法。该方法充分考虑了环境的变换对最大输出功率点的影响,避免了扰动法和增量电导法的误判问题,以及固定电压法无法跟踪问题。利用Matlab/Simulink建立仿真系统,结果验证了该方法的可行性,以及该方法能提高最大输出功率点跟踪的效率和精度。 相似文献
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文章采用了自适应模糊控制来跟踪光伏发电系统的最大功率输出点.自适应模糊控制算法比传统的模糊控制算法对如负载跳变、太阳能电池以及外部条件的改变具有更强的适应能力,能更准确的跟踪系统的最大功率输出点.光伏发电系统由太阳能电池、交错并联磁集成Boost变换器和自适应模糊控制器组成.采用交错并联磁集成技术可以减小电感的稳态相电流纹波,提高变换器的效率,同时还能提高光伏发电系统的暂态性能.自适应模糊控制方法对外界条件的改变具有更强的适应能力.最后使用了ORCAD软件对整个系统进行了仿真,并对负载突变和太阳能电池电流改变进行了仿真.仿真结果表明了采用自适应模糊控制算法可以提高光伏发电系统的总体性能. 相似文献
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嵌入式太阳能充电系统的设计 总被引:1,自引:0,他引:1
给出了采用嵌入式芯片来对太阳进行角度跟踪和太阳能电池板最大功率点跟踪,从而实现用太阳能对用电电路进行充电的太阳能充电系统的设计方法。利用该方法可以对太阳能进行充分利用.以使太阳能电池保持最大的输出功率。 相似文献
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电导增量法实现光伏系统的最大功率点跟踪控制 总被引:2,自引:1,他引:1
最大功率点跟踪控制是光伏并网发电系统中经常遇见的问题。介绍光伏并网系统的结构,通过对太阳能电池功率电压曲线的分析,结合光伏并网系统的特性和太阳能电池的最大功率点的跟踪原理,提出一种采用电导增量法来实现光伏系统的最大功率点跟踪的方法。此方法控制精确、响应速度比较快,适用于大气条件变化较快的场合。 相似文献
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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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《Mechatronics》2015
The field-programmable gate array (FPGA) based intelligent sun tracking system proposed in this paper uses an NI 9642 controller to integrate the dual-axis sun tracking system with a Maximum Power Point Tracker (MPPT), so as to effectively increase the output power of solar panels. Furthermore, it is provided with multiple intelligent functions, so that the system can start up the sun tracking function automatically in the daytime, and automatically return to its initial position at night. It has a delay function to reduce the electric power consumed by the motor in rotation. Moreover, it can be switched to dual-axis or one-axis sun tracking freely as required by the user, and the solar panel inclination can be operated directly. The dual-axis sun tracking system uses the Particle Swarm Optimization (PSO) method to look for the parameters of the PI controller. The Taguchi Method and Logistic Map are proposed to enhance the steady state convergence of PSO in seeking the optimal solution. The MPPT uses Fuzzy Logic to adjust the step length of the incremental conductance method, so as to remedy the defects in the traditional fixed step method, and to make the solar panel output reach the maximum power point position rapidly and stably. 相似文献
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光伏并网发电系统是光伏系统发展的趋势,文章根据光伏并网发电系统的特点,设计了一套基于数字信号处理器TNS320F2407控制的单相光伏并网逆变器。分析了系统的结构和控制原理,设计了最大功率点跟踪算法和锁相环的软件设计流程图。实验结果表明并网电流波形良好,逆变器输出的电流基本与电网电压同频同相,并网的功率因数近似为1。 相似文献
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A Single-Phase Voltage-Controlled Grid-Connected Photovoltaic System With Power Quality Conditioner Functionality 总被引:1,自引:0,他引:1
Mastromauro R.A. Liserre M. Kerekes T. Dell'Aquila A. 《Industrial Electronics, IEEE Transactions on》2009,56(11):4436-4444
Future ancillary services provided by photovoltaic (PV) systems could facilitate their penetration in power systems. In addition, low-power PV systems can be designed to improve the power quality. This paper presents a single-phase PV system that provides grid voltage support and compensation of harmonic distortion at the point of common coupling thanks to a repetitive controller. The power provided by the PV panels is controlled by a Maximum Power Point Tracking algorithm based on the incremental conductance method specifically modified to control the phase of the PV inverter voltage. Simulation and experimental results validate the presented solution. 相似文献
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Adaptively quadratic (AQua) image interpolation 总被引:9,自引:0,他引:9
Image interpolation is a key aspect of digital image processing. This paper presents a novel interpolation method based on optimal recovery and adaptively determining the quadratic signal class from the local image behavior. The advantages of the new interpolation method are the ability to interpolate directly by any factor and to model properties of the data acquisition system into the algorithm itself. Through comparisons with other algorithms it is shown that the new interpolation is not only mathematically optimal with respect to the underlying image model, but visually it is very efficient at reducing jagged edges, a place where most other interpolation algorithms fail. 相似文献