一种光伏模拟电源的设计

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。     

端子骚扰电压测试要素分析

介绍端子骚扰电压的测试原理,结合CISPR 16-4-2:2012分析了影响该测试项目测试结果的六个关键要素:人工电源网络、测量接收机、信号传输路径、测试系统接地、测试布置及测试用软件。并针对这六个要素,给出了提升端子骚扰电压测试准确度的建议。     

一种单相双模五电平无变压器光伏逆变器

针对分布式低压光伏发电系统,提出了一种新型双模五电平共地型(Five-leve dual-mode common-ground type, 5L-DM-CGT)无变压器逆变器,并具有宽输入电压范围(200V-400V)。简言之,所提拓扑通过将光伏阵列的负端直接与电网中性点相连,从而绕过光伏阵列的杂散电容,实现消除共模(Common-mode, CM)漏电流的目的。此外,本文可根据输入电压的大小可在Buck和Boost两种模式下运行,以产生相同的交流输出电压。最后,通过 MATLAB-Simulink仿真和实验结果验证了所提出的拓扑结构和控制方法的可行行和正确性。     

电源端子骚扰问题研究

该文对试验人员在进行电源端子骚扰电压试验过程中经常发生的,却没有留意的细微行为进行了阐述,分析了该细微行为对电源端子骚扰电压试验结果造成影响的原因。     

光伏逆变器的传导发射超标整改

某型号的太阳能光伏逆变器整机依据国内金太阳认证的电磁兼容标准GB 7260.2-2009测试时,交流输出口电源线上的传导发射超标,通过分析测试结果曲线、逆变器工作原理、传导发射特性,制定了在逆变器的直流输入口和交流输出口加滤波电容和电源线上绕磁环等方案.整改后,光伏逆变器的传导发射测试结果符合GB 7260.2-2009的要求.     

两级式光伏并网发电控制系统仿真分析

阐述了两级式光伏并网发电控制系统的结构及其控制过程,建立了光伏阵列模型和光伏并网发电系统模型,利用光伏阵列模型模拟了光照条件变化时光伏并网系统的输出情况进行仿真分析。实验表明,此两级式光伏并网发电系统能迅速有效地跟踪到光伏阵列的最大功率点,而且能够控制并网电流的波形,使逆变器的输出电流与电网电压同频同相,保证电流输出波形为正弦波。     

Z源型光伏并网逆变器研究

介绍并分析Z源型光伏并网逆变器的拓扑结构及其工作原理。基于并网逆变器Z源阻抗网络的特殊性质,为改善输出波形质量,减少并网电流谐波,系统省略传统逆变桥臂的死区设定,通过控制逆变桥臂的直通矢量占空比实现光伏阵列输出电压的升压功能。利用Matlab对逆变器控制系统运行控制模式进行仿真,仿真结果证明理论分析的正确性和有效性。     

英飞凌1700V CoolSiC™MOSFET在光伏辅助电源上的应用

前言:随着“3060”碳中和目标的提出,一时间光伏发电行业引起了社会的广泛关注。光伏逆变器是光伏发电中至关重要的设备,承担着电池板功率控制(MPPT)以及直流交流转换(DC/AC)的重任。每一台光伏逆变器,都有一套或者两套辅助电源默默的“点亮”控制和驱动电路。对于几十kW以下的户用单相机或者小三相机,一般一套几十瓦的辅助电源就可以满足要求。而对于最近比较火爆的用于1500V地面电站的200kW plus的组串式逆变器,则需要两套150W~200W的辅助电源,一套位于直流侧承担着主要的供电任务,一套位于交流测担负着PID修复以及后备供电任务。辅助电源在光伏逆变器中默默的工作,低调的存在,但是却不可或缺。下面我们就一起来揭开光伏辅助电源的神秘面纱。     

新界面的全自动EMI测试接收机

KH3900系列EMI全自动测试接收机,是进行EMI测试的重要工具.KH3900系列接收机频率范围从9kHz～1000 MHz,完全满足电源端子和电信端口的传导骚扰测试,电源线功率骚扰测试,辐射骚扰测试,该机具有测试速度快、可操纵性强、性能稳定、测试数据处理方便等优点.     

分布式供电网络中新型光伏并网逆变器研究

并网逆变器在以光伏发电为电力来源的分布式供电系统中起到关键的连接作用,其可将光伏阵列所发电能逆变为与电力网络电压频率相同、相位一致的电压与电流保证光伏发电系统和电力网络正常运行。但传统并网逆变器存在共模漏电流严重,中点电位二次脉动以及转换电压二次谐波含量较多的问题。为改善并网逆变器的逆变性能,设计一种新型无隔离变压器结构的单相逆变器。分析新型并网逆变器直流变换电路模块和直流交流变换电路模块的工作机理,并将其与传统并网逆变器对光伏阵列所产生的电平处理效果进行仿真比较,结果表明,新型逆变器输出逆变电压二次谐波含量较传统逆变器降低54.87%,具有较好的逆变功能。     

Photovoltaic systems

An overview of photovoltaic (PV) systems is presented, including a discussion of major US and international activities. After a brief review of system types and output characteristics, various system configurations are discussed and a classification based on photovoltaic (PV) system rating is provided. Modeling, design, and economic considerations are briefly discussed. Synopses of typical operating systems in the US, Japan, and selected European countries are included. The worldwide status of PV system technology is discussed with a view to assessing its future. The assessment presented includes some specific areas for further research and development. Although no major technical barriers are evident for the entry of PV, as the level of penetration increases, several key issues identified will need further consideration. It is concluded that while photovoltaics is still evolving and has not reached its full potential, its rate of growth may depend on several exogenous factors such as cost of conventional energy sources and people's desire to improve the global environment     

Photovoltaic Rural Electrification

The history of photovoltaic rural electrification (PVRE) from the early systems installed at the end of the 1960s is reviewed and presented in three different contexts: developed countries, international aid and developing countries. The progression from community applications (school televisions, village drinking water pumps, health centres, etc.) to individual applications (domestic electrification) is outlined. Differences between the concepts of ‘basic’, ‘perceived’ and ‘standard’ electricity needs are discussed. Relative advantages of the different products comprising current PVRE are analysed in the light of potential user perceptions. Proposed large-scale PVRE programmes based on solar home systems are analysed, paying special attention to two aspects that have become controversial issues in the PV community: the capabilities and role of the users; and the need for systematic quality control procedures. Finally, some economic figures related to investment and maintenance costs are proposed. © 1997 John Wiley & Sons, Ltd.     

Photovoltaic power generation

It is noted that the wide acceptance and utilization of the photovoltaic generation of electrical power largely hinges on the ability to decrease the cost of production of solar cells and panels while at the same time increasing their conversion efficiency. A short tutorial is given on solar cells that are presently being investigated for cost reduction and efficiency improvement. The many types of cells are under investigation as well as the wide range of materials are examined. Efficiency improvements that have been achieved for many types of cells that are potentially low cost in large-volume production are described     

Photovoltaic system award

Kobe Steel's photovoltaic system has received the New Energy Foundation Chairman Prize from the New Energy Foundation, US. It was selected for the prize because of an innovative application of PV modules to the walls and roof of the Dai-Ichi Minami building in Kobe, western Japan.     

Regulation of Photovoltaic Voltage

Manufacturing systems changed towards higher degrees of automation in the 1980s. Today's manufacturing systems again face a fundamental change. One of the key matters of this change is going to be the modularity of tomorrow's manufacturing systems. This article analyzes the industrial and technological background of this change from the perspective of a large manufacturing company in the automotive, consumer goods and automation industry. A seminal definition of modularity for manufacturing systems is given. A new categorization of manufacturing systems based on the granularity of their modules is presented. Within this categorization manufacturing systems are divided into standard-machine-based production systems, cell-based production systems, workstation-based production systems, and unit-based production systems. Advantages and disadvantages of the different concepts are discussed with respect to future requirements. Finally, challenges and trends of the future manufacturing technology are outlined.     

光伏器件的应用

介绍了以光伏二极管阵列为核心元件组成的光伏耦合器和光伏型固体继电器的特点，电原理，使用方法和性能参数。     

Photovoltaic Array Reliability Optimization

Several statistical reliability studies have been conducted in areas of photovoltaic component design covering cell failure, interconnect fatigue, glass breakage and electrical insulation breakdown. This paper integrates the results from these studies and draws general conclusions relative to optimal reliability features for modules. The analysis is based on designing for specified low levels of component failures and then controlling the degrading effects of the failures through the use of fault tolerant circuitry and module replacement. Means of selecting the cost-optimal level of component failures, circuit redundancy, and module replacement are described.     

浅谈光伏电缆的研制

随着太阳能的开发和利用,光伏发电已成为开发太阳能的主要途径,积极开发作为传输部件的光伏电缆具有重要意义。为了满足光伏系统在户外恶劣环境条件下的工作要求,开发了太阳能发电用光伏电缆,它具有耐高低温性能好、耐紫外线能力强、耐酸碱化学腐蚀性高、耐磨性能好、使用寿命长及低烟无卤阻燃等优点。