共查询到19条相似文献,搜索用时 421 毫秒
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传统汇流箱通常控制核心比较简单,功能单一,控制核心试试处理能力弱,通讯效率较低且抗干扰能力较低.随着嵌入式技术的发展,简单的控制器已经不符合光伏监控系统稳定可靠、实时响应的要求.针对这些问题,本文设计了一种基于ARM Cortex-M3为核心的STM32F10x控制器的光伏汇流箱,该汇流箱能够监测汇流箱电压、电流、温度等多种参数,具有标准的MODBUS协议接口,向监控系统实时上传,同时能实现远程控制汇流箱通断,方便接入光伏电站监控系统.在控制电路中加入SD卡存储设计,在通讯故障的情况下保证了数据的就地历史备份,可插拔的SD卡,也使得取数和维护更加方便.另外,对汇流箱作了防雷设计及电路抗干扰设计,提高了汇流箱的整体抗干扰能力. 相似文献
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为给被测试的光伏逆变器提供一个测试其最大功率点性能的环境,设计了一种光伏模拟电源。其主要由整流滤波电路和DC/DC电源组成。整流滤波电路将交流电变成直流,开关电源部分完成降压功能,通过将输出电压采样送入误差比较器中与控制器RAM中的电压进行比较,来控制输出电流和电压,使其工作在对应的I-V曲线上。文中设计的光伏模拟电源可人为地输入温度和日照来模拟太阳能光伏曲线。 相似文献
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《电子技术与软件工程》2016,(17)
近年来我国新能源行业发展较为迅速,尤其是太阳能和风能,在国家政策的大力支持下,目前已经进入快速发展阶段。目前大部分光伏发电单元内汇流箱、逆变器、箱变等设备的通信是把信息先送至通讯管理机,再经光纤收发器上传到综自系统,这样就使整个系统的接线过于繁多,增加了故障发生的可能性。BHE-336T在传统方案的基础上融合了通信管理机、光纤交换机和完善的箱变测控保护功能于一体,负责采集和传输箱变、汇流箱、逆变器等设备的数据信息;这不但简化了整个光伏发电单元的接线,提高了系统的稳定性,而且降低了光伏电站测控通信类设备投资成本。 相似文献
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LD在开关电源驱动下的结温与输出特性研究 总被引:1,自引:1,他引:0
半导体激光器(LD)的驱动电路要求能够提供充足的载流子,且工作状态要稳定.从半导体物理学理论出发,分析了半导体激光器在恒流和稳压2种状态下,结电压、结电流和结温三者的关系.并以此为理论基础,进行了半导体激光器在双路跟踪电源恒流模式和开关电源LT1912驱动下的实验.实验结果表明,开关稳压电源驱动半导体激光器正常工作的核心条件是能够提供充足的载流子,即开关电源要具备低电压高功率的输出特性.开关稳压电源驱动半导体激光器的优点在于电路设计简单,不用考虑过流保护和过压保护电路,且半导体激光器的工作状态也很稳定. 相似文献
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对光伏发电问题进行了研究,提出了二象限DC-DC变换器的设计,变换器主电路采用半桥式双向直流变换的结构拓扑,实现了能量的双向流动和升降压功能;控制电路采用TMS320LF2407DSP为中心控制芯片,由专门的电压、电流采样调理电路以及驱动电路完成脉冲宽度调制(PWM,Pulse WidthModulation)信号的产生和输出,并对PWM信号的产生、输出进行电力电子仿真(PSIM,Power Simulation),结果表明,该变换器能够实现蓄电池的充放电和升降压电路功能,提高光伏组件的利用率。 相似文献
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Renewable energy, such as solar energy, is desirable for power generation due to their unlimited existence and environmental friendly nature. However, the high initial investment impedes its wide commercialization. This paper proposes a cost-effective single-stage inverter with maximum power point tracking (MPPT) in combination with one-cycle control (OCC) for photovoltaic power generation. This control scheme is based on the output current-adjusting feature of OCC. The output current of the inverter can be adjusted according to the voltage of the photovoltaic (PV) array so as to extract the maximum power from it. In the mean time, OCC guarantees that the output current is proportional and in phase with the grid voltage. All these are accomplished in one power stage and a simple control circuit. No detection and calculation of power are needed. Compared with previously proposed approaches, this method is much more efficient and cost-effective and yet exhibits excellent performance. The principle is explained qualitatively and extensive experiments have been carried out to verify the proposed method. 相似文献
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太阳能光伏发电是开发利用新能源的主要形式之一,但是太阳能发电受日出和日落、晴天和阴天等环境因素影响,存在间歇问题,在阴天和雨天因其发电不足会给生产和生活带来诸多不便。为了充分利用太阳能发电,使其能够与公用电网有效互补,文中设计了一种基于户型光伏发电与公用电网互补自动切换系统。该系统由信号比较和开关控制两部分电路组成。信号比较电路用于检测蓄电池最低工作电压,当检测到蓄电池的输出电压低于最低工作电压,系统就自动切换到公用电网;当检测到蓄电池的输出电压高于或等于最低工作电压时,系统就自动切换到太阳能发电系统。 相似文献
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光伏并网发电已成为目前发展最快、应用面最广的光伏能源应用技术。在光伏系统中,由于电池光电转换效率过低,导致其不能以最大功率输出,最大功率点跟踪(MPTT)是光伏并网发电系统中的核心技术。系统采用单片机ATmega128作为核心芯片输出SPWM信号,实现最大功率点跟踪功能、频率相位跟踪功能、输入欠压保护功能以及输出过流保... 相似文献
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论文系统设计了包括太阳能电池板、充放电控制器控制蓄电池充放电、液晶显示电路、铅酸电池、逆变模块、直流电流逆变为交流电、负载供电的太阳能光伏发电小型系统。经性能指标测试,过压、过放、反接、短路等各种电路保护功能完好,能在液晶显示器上实时显示蓄电池的电压和放电电流值,逆变控制电路输出的正弦波交流电波形畸变小,电压、频率稳定。 相似文献
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This paper proposes a method for tracking the maximum power point (MPP) of a photovoltaic (PV) module that exploits the relation existing between the values of module voltage and current at the MPP (MPP locus). Experimental evidence shows that this relation tends to be linear in conditions of high solar irradiation. The analysis of the PV module electrical model allows one to justify this result and to derive a linear approximation of the MPP locus. Based on that, an MPP tracking strategy is devised which presents high effectiveness, low complexity, and the inherent possibility to compensate for temperature variations by periodically sensing the module open circuit voltage. The proposed method is particularly suitable for low-cost PV systems and has been successfully tested in a solar-powered 55-W battery charger circuit. 相似文献
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Bor-Ren Lin 《International Journal of Electronics》2019,106(9):1360-1373
This paper studied a bidirectional frequency-control dc converter with magnetic-coupling to achieve 1) current balance on low voltage side, 2) low switching losses on power devices, and 3) bidirectional power transfer capability. The developed circuit is basically constructed by half-bridge circuits on input and output sides. LLC resonant tank with frequency-control is used to obtain low switching losses on power devices. Magnetic-coupling element is used to achieve current balance on low voltage side. Synchronous rectifiers are employed on low voltage and high current side to decrease power losses and increase circuit efficiency. The effectiveness of the studied circuit is verified from a 720 W laboratory prototype. 相似文献