光伏电站的可靠性分析

本文初步探讨了组成光伏电站的各主要部分与系统可靠性的关系，提出一些影响可靠性的问题及相应采取的措施。     

工厂光伏电站投入前后功率因数问题的分析

针对工厂内部的光伏电站投入前后,工厂变配电系统的功率因数变化及存在的问题进行分析。对工厂内部光伏电站投入前后,应如何考虑无功功率和功率因数,以及如何进行无功补偿等诸多问题进行了一些探讨。     

大型光伏电站的并网运行

本文介绍了美国４００ｋＷ非晶硅太阳能电池光伏电站的并网运行情况，对光伏电站并网中的逆变器特性进行了分析。     

并网光伏电站关键部件的运行性能分析

简要概述了50kW大型并网光伏电站的系统构成；通过一段时间的运行，对该电站的一些关键部件进行性能评价。分析结果表明：电站的光伏组件设计合理，并网逆变器具有较高的转换效率。     

基于机理模型的并网光伏电站实时效率分析

目前并网光伏电站实时效率分析还缺少实际的算法和研究。针对该问题,首先根据经典天球坐标系统理论提出分析效率时需要计算数据;再根据太阳辐照原理得出固定倾角光伏组件的理论发电量,并根据某电站的地理经度、组件实时工作温度修正后,计算出该光伏电站的实时效率;最后根据该电站的实际运行情况,提出设计的不足和提高电站发电效率的措施。     

大型光伏电站电气设备的运行维护要点

根据青海格尔木龙源光伏电站3年来的实际运行情况,总结了光伏电站电气设备的运行和维护要点,为保障光伏电站运行的可靠性提供了技术支持。     

上海崇明前卫太阳能光伏电站的运行实践和成果

我国最早运行的兆瓦级并网光伏电站示范项目之一,崇明前卫太阳能光伏电站已经运行4年,介绍了该光伏电站的运行情况和经验,并对电站的发电量变化进行了分析.     

国内早期光伏电站的系统效率及系统效率损失分析

我国早期建成的光伏电站在数据采集监控(SCADA)系统应用方面相对薄弱,导致电站运维人员无法科学、准确地判断光伏电站的系统效率及电站的健康运行情况.对我国境内于2010～2015年投产的15座装机规模为10 MWp以上的光伏电站进行了实地检测,电站所在区域覆盖了华北、华东、华南、西北4个地区,电站类型包括平原光伏电站、...     

实验用小功率光伏并网电站的设计

介绍实验用小功率光伏并网电站并系统地阐述电站各个组成部分的具体设计。该电站自动化程度高,其设计融合了建筑一体化、远程监测、远程数据采集和实时显示等先进技术,可以承接电力电子、自动控制等多项实验科目,具有较强的实验功能和示范作用。     

浅析离网光伏电站的系统设计

由于自然环境条件的制约,至今仍存在着许多未通电的村落,采用离网光伏电站解决这些地区农牧民基本生活用电问题无疑是一个既经济又有效的电力解决方案。主要对离网光伏电站的工作原理、系统配置设计、主要设备选型等进行了论述和分析。     

基于物联网的光伏电站SCADA系统

在光伏电站中,应用监控系统来保障其安全、稳定运行是必须的手段。文章针对大型光伏电站监控系统中存在的诸多问题提出了一种解决方案——开发基于物联网的光伏电站数据采集与监视控制(SCADA)系统。该系统可实现光伏电站的无人值守,并结合物联网先进技术实现数据的无线传输、网络接入等功能,为光伏电站运营商提供了一个集中监控多个跨地域光伏电站群的良好平台。     

Analysis and enhancement of PV efficiency with incremental conductance MPPT technique under non-linear loading conditions

This paper presents experimental evaluations for variation in the efficiency of energy extracted from a photovoltaic (PV) module (under non-linear loading) incorporated with an incremental conductance(IC) maximum power point tracking (MPPT) algorithm. The focus is on the evaluation of the PV panel under non-linear loading conditions using the experimental installation of a 100W_p photovoltaic array connected to a DC–DC converter and a KVA inverter feeding a non-linear load. Under the conditions of non-linear loading, both the simulation and experiment show that the MPPT technique fails to attain maximum power point due to the presence of ripples in the current leading eventually to a reduction in efficiency. In this paper, panel current is taken as a function of load impedance in the MPPT algorithm to eradicate power variation, as load impedance varies with supply voltage under non-linear conditions. The system is simulated for different non-linear loads using MATLAB-Simulink. A TMDSSOLAREXPKIT was used for MPPT control. In case 2, the inverter is connected to a single phase grid. When a voltage swell occurs in the grid, PV power drops. This power loss is reduced using the proposed MPPT method. The results of simulations and experimental measurements and cost efficiency calculations are presented.     

基于遗传算法优化粗糙决策模型的光伏电站发电量的影响因素研究

通常光伏电站设计时要考虑2个主要目标,一个是使光伏电站的发电量最大,另一个是使光伏电站的度电成本最低.影响光伏电站发电量的因素众多,不同因素之间的相互影响及其交互影响极其复杂.在粗糙决策模型的基础上,引入遗传算法来寻找光伏电站发电量的主要影响因素.以光伏电站发电量作为决策属性,选取8个参数作为条件属性,建立了光伏电站发...     

Frequency control by the PV station in electric power systems with hydrogen energy storage

The rapid growth of renewable energy capacity, in particular photovoltaic systems, is creating challenges associated with changing the rate of transient processes in the power system. This is due to the approach PV systems are connected to the grid using power converters and the absence of a rotating mass in the PV power plant. One of the most pressing challenge is the participation of PV stations in the process of frequency control in power systems, including in emergency modes. Simultaneously with PV power plants, it is efficient to use energy storage systems, including hydrogen ones. This is due to the fact that it is possible to obtain hydrogen for such energy storage systems using excess energy from PV power plants. The article proposes to solve the problem of frequency regulation in the power system by using an algorithm that allows to control the frequency in the power system using a synthetic inertia block of PV station, including at different levels of insolation and temperature of PV panels. The robustness of the proposed algorithm allows it to be used at different levels of power generated by the PV station, as well as in emergency modes.     

风光互补电动汽车储能电站系统优化设计

通过对唐山市区太阳能和风能资源状况调查分析,对全年不同方位角和倾角上的太阳能辐射量进行模拟计算,得出南偏东9.8°方向、倾角为39.7°的倾斜面上接收的太阳能辐射量最大,其值为1.62×106Wh/m2。研究中对3kW风力发电机和1kW光伏发电系统的发电量进行了计算,并以1辆纯电动轿车为负载进行了容量配比优化,设计了风力发电系统、风光互补系统及光伏系统三种不同的方案,经过对各方案的经济性、可靠性及稳定性分析,得出最佳的设计方案为风光互补发电系统,该系统风力发电装机容量为3kW,光伏发电装机容量为8.96kW。     

光伏并网发电功率波动与对策

分析了光伏并网发电功率波动对电网可能造成的危害及储能型光伏并网系统的运行工况,提出了并网功率的给定方法,即以光伏阵列输出功率进行低通滤波后的值作为参考并网功率,还详细分析了低通滤波器的设计、双向DC/DC变换器的功率控制,最后进行了仿真研究。仿真结果表明,采用此控制策略可以有效控制功率的波动,减小其变化率,即使光照波动较大,光伏系统输出的电流波形也很好,储能系统随着光伏阵列发出功率的波动而改变功率流动的方向和大小。     

Research on the influence of PV cell to thermal characteristics of photovoltaic/thermal solar system

In the paper, we analyzed internal thermal transmission characteristics of water‐heating photovoltaic/thermal (PV/T) solar collector covered by photovoltaic (PV) cell, established photothermal conversion model of PV/T solar system, and analyzed the influence of PV cell coverage to photothermal characteristics of PV/T solar system. Results show that the thermal efficiency of PV/T solar system by optimizing PV cells coverage can reach 68%. In addition, by designing four water‐heating PV/T solar system prototypes with PV cell coverage of 0.4, 0.56, 0.7, and 0.82, respectively, we conducted experimental researches for the four prototypes and found that the four prototypes can achieve thermal efficiencies of 58%, 51%, 64%, and 67%, respectively, in heating 250 L of water to 50°C. The experiment results are consistent with theoretical analysis results, indicating that it is feasible to improve thermal characteristics of PV/T solar system by optimizing PV cell coverage. Copyright © 2017 John Wiley & Sons, Ltd.     

Optimal sizing of a grid-connected PV system for various PV module technologies and inclinations, inverter efficiency characteristics and locations

An optimal sizing methodology based on an energy approach is described and applied to grid-connected photovoltaic systems taking into account the photovoltaic module technology and inclination, the inverter type and the location. A model describing the efficiency for m-Si, p-Si, a-Si and CIS is used. The method has been applied on various meteorological stations in Bulgaria and Corsica (France). The main parameter affecting the sizing is the inverter efficiency curve. The influence of the PV module technology seems less important except for amorphous photovoltaic modules for which special remarks have been made. The inclination on the PV system influences the performances particularly when the inverter is undersized compared to the PV peak power.