太阳能LED照明用一体化电源设计

太阳能光伏发电控制器和LED照明驱动电源是太阳能LED照明的关键设备,针对传统太阳能LED照明中采用的是控制器加驱动电源的分体式设计结构,具有设计复杂、工作效率低和可靠性差等缺点。设计了一种太阳能LED照明用控制/驱动一体化电源系统和解决方案,对系统的组成进行了详细阐述,并进行了系统的硬软件设计及实现,最后通过实验测试验证了该一体化电源的优点,很好地解决了太阳能LED照明应用的关键技术难题,具有的广阔工程应用和市场前景。     

社区智能光伏LED照明设计研究

从我国太阳能资源分布入手,以山西省太阳能资源量为例结合相关技术发展状况分析了光伏技术发展的潜力,同时对比现有照明光源的特征参数,显示出了LED颗粒作为照明光源的优势,最后参考我国城市道路照明设计标准设计出了一套高效节能低成本的光伏LED照明方案。     

基于开路电压法光伏电池最大功率追踪器

光伏电池的最大功率点跟踪(MPPT)对提高太阳能的利用率以及充分利用太阳能所转换的能量而言至关重要。由于开路电压法特别适用于小功率光伏发电系统,因此选择开路电压法作为MPPT的控制方法。在分析了设计需求后,设计了基于单片机控制的开路电压法光伏电池最大功率追踪器,并采用大容量电源负载装置模拟电源功能模拟的光伏电池进行实验,设计的最大功率追踪器效率可达85%以上,特别适合应用在要求低成本小功率的太阳能LED路灯工程中。     

高性能太阳能逆变电源的研制

近年来太阳能光伏电源得到了较大的发展。目前我国西北地区仍以直流太阳能系统用户为主,随着居民生活水平的提高,人们越来越希望应用交流太阳能系统。交流太阳能系统的应用,使太阳能光伏电源逐步走向通用化、标准化。目前光伏电源逆变器大多采用推挽升压电路(如图1所示),该逆变器主要由功率晶体管和升压变压器组成,功     

风光互补技术及应用新进展

简要回顾国内外风电、光伏技术与应用发展态势,结合风光互补系统应用,分析、介绍了风光互补LED路灯照明系统、智能控制器设计、分布式供电电源、风光互补水泵系统,并着重分析生物质能、风能和太阳能互补分布式能源梯级系统原理,涉及的技术关键等。研究表明,风能、光伏发电应用需要实现低成本、规模化,风光互补技术应用前景广阔。     

光电互补的LED路灯控制系统的设计

由于太阳能受天气、季节的影响,使得光伏系统供电的可靠性不能保证,本文设计了一种太阳能和市网供电相结合的光电互补LED路灯照明系统。设计中充分考虑了光伏电池的最大功率点跟踪,提高了太阳能电池板的利用率,对LED路灯进行了恒流驱动,保证了LED路灯的寿命和发光效率。     

太阳能半导体照明驱动技术研究

结合太阳能光伏系统应用特点和大功率照明LED的驱动特性,对太阳能半导体照明驱动技术进行了研究,并研制了一种新的太阳能路灯控制器,不但能够实现对光伏系统中的蓄电池防过充、过放保护,而且还实现对LED光源的亮度可控调节.     

光伏无线LED艺术灯系统设计

光伏无线LED艺术灯系统是一种基于光伏发电、无线传输技术、LED灯具的新型艺术灯光系统。它采用光伏组件将太阳能转化为电能,并通过无线电力输送装置向LED艺术灯供电,免除了外部繁杂的导线,从而使艺术灯具外观新颖、简洁。     

探讨太阳能LED照明如何与城市建设和谐发展

在我国,由于大力推广LED及太阳能光伏技术,各级政府均对该产业加大了扶持力度,科技部推广应用的“十城万盏”就是典型的例子.2009年中国的LED路灯数量约25万盏,2010年达到了40万盏以上的规模.本文探讨了太阳能LED照明与城市建设和谐发展的问题,给出了太阳能LED照明系统让城市景观照明建设与环境和谐发展的合理设计方案,并对现阶段太阳能LED照明存在的主要应用困难给出了解决思路.     

太阳能光伏发电并网系统的建模和仿真

为开展太阳能光伏发电并网系统的研究,采用光伏电源外特性等效方法,推导了大容量太阳能光伏发电的数学模型,搭建了10MW光伏电源的仿真模型。在此基础上,提出了改进的扰动观察最大功率跟踪方法,该方法不受测量和计算误差的影响,能保证光伏电源尽快稳定在最大功率点。应用正弦脉宽调制的电压型三相桥式逆变器和具有阻尼电阻的LCL滤波器作为光伏电源与电网之间的接口,采用内外环加同步比例积分的电流控制技术实现并网。仿真实验验证了搭建的10MW光伏并网发电系统的可行性和正确性,并网电流谐波符合IEEEStd929—2000的要求。     

Simulated power source based on output characteristics of solar cell

Numerous studies were performed to evaluate the performance of photovoltaic power systems (PV systems), including maximum power control of the solar cell, effects of the PV systems on distribution feeders, long-term performance of the PV systems, etc. To estimate the performance of PV systems, the output characteristics of the solar cell should be taken into consideration. This paper proposes a new method of the simulated power source (SPS) to analyze the PV system. The SPS is under the control of the 10 cm² reference solar cell, hence, the output characteristics of the SPS are in proportion not only to the static output characteristics of the reference solar cell, but also the dynamic ones.     

Design and control of LCL filter interfaced grid connected solar photovoltaic (SPV) system using power balance theory

In this paper solar photovoltaic (SPV) system connected to the utility grid is designed and simulated. The utility grid and SPV system are coupled with current controlled voltage source converter (VSC) and LCL filter. The design of LCL filter, MPPT algorithm and power quality improvements are discussed and simulation results are shown for the performance analysis of grid-coupled PV system under different load condition. The system is controlled through power balance theory method. The principle behind the control implementation is to evacuate the solar power generated during the daytime and the reactive power demand for the load should be supplied by the PV. The grid coupled system consists of SPV system, dc–dc boost converter, maximum power point tracking (MPPT), voltage source converter (VSC), LCL filter, different loads and three phase utility grid. This system is capable of eliminating harmonic and load balancing by supplying unbalanced current from the PV as a compensator. The system is simulated with 10 kW SPV array using indirect current control scheme.     

Monitoring and control technology of solar photovoltaic power generation system

In view of characteristics of solar photovoltaic (PV) power station such as the decentralized layout and massive monitoring and control information, a solar PV power generation monitoring and control system has been designed. The system is designed into three layers namely the sensor and actuator layer, the PLC field monitoring and control layer and the remote network monitoring and control layer. Through ZigBee wireless network, PROFIBUS and GPRS wireless network, the system makes the three layers exchange information rapidly, and the system supervises not only various operational parameters of the power generating system but also weather changes as a way to change the solar tracking strategy of the PV power generating system and reduce the operating energy consumption of the system. Through the hardware redundant design of PLC central controller and the upper computer, the solar PV power station can be more secure and reliable when running.     

太阳能冷热电联供系统的综合性能评价与研究

为了高效利用丰富的太阳能资源,同时满足用户多样化能源的需求,可以采用太阳能实现冷热电联供。当太阳能作为热源或辅助电源时,系统较为稳定且控制方法简单。但是当两种形式同时存在时,会导致太阳能的能源利用率降低且成本升高。因此,需要一种方法对太阳能冷热电联供系统(PV/T-CCHP)的优劣进行评估。提出采用基于Fuzzy-AHP的多目标决策法(MCDM),建立PV/T-CCHP系统指标体系。以传统的分供系统作为参考,从四个角度分别评估了PV/T-CCHP系统运行性能、不同控制策略下的运行性能以及综合运行性能。研究结果可以为PV/T-CCHP系统的设计运行提供参考。     

玉树灾后重建LED道路照明设计

按照玉树灾后重建工作的总体部署,基于玉树的特殊地理环境、气候特点和道路、供电现状,以及对环保、节能、民族特色等的综合分析,通过对多种照明方式和照明光源的比较,确定了玉树首府结古镇的道路照明采用市电路灯和太阳能路灯相结合的照明方式,并选择LED为所有道路照明光源.本文对LED光源的道路照明标准、色温、海拔和环境温差影响等问题进行了探讨.     

独立式LED太阳能光伏照明系统的设计

设计了一种独立式LED太阳能光伏照明系统。利用改进的增量电导法对太阳能电池输出进行最大功率点跟踪(Maximum Power Point Tracking,简称MPPT)控制,根据独立式太阳能LED照明系统的工作特性,采用一种新型的MPPT充电控制策略。设计了大功率白光LED灯具恒流驱动电路及自动调光功能,用于维持室内照度的稳定。     

Modeling,control and analysis of cascaded inverter based grid-connected photovoltaic system

This paper proposes a vector controlled isolated source cascaded two-level inverter (CTLI), for grid connected photovoltaic (PV) system. The system is controlled to operate with variable solar irradiance, supplying different levels of active power. The PV systems are designed, modeled and tested with the proposed controller, to provide maximum power output. Additional operation as a reactive power supplier, in the absence of solar radiation, is also tested. A simple sinusoidal pulse width modulation (PWM) technique is used, instead of referred space vector PWM (SVPWM) technique, for the operation. Two different schemes have been considered to operate the inverter with equal and unequal DC-link voltages. The control scheme has been found working, for both active and reactive power supply in steady state and transient conditions. The power supplies of both the schemes are analyzed. The controller performance is found to be satisfactory for both the schemes to extract maximum power at the considered working conditions.     

建筑一体化太阳能光伏发电系统在办公楼改建工程中的应用

介绍了太阳能光伏发电系统技术在改建工程中的推广应用。通过工程真实案例,对光伏组件材料的选型、阵列倾角和面积的确定、发电系统的设计等进行了运算分析。工程运行的结果验证了该项技术的可靠性和有效性。