三相60kW光伏并网发电系统

1引言 光伏并网发电是近几年才发展起来的新技术，它为光伏的大规模利用提供了广阔的市场空间，代表着未来的前进方向。我国在光伏并网发电技术方面的研发起步较晚，尚处于研究试验阶段，但近两年来光伏并网发电技术已得到了业内人士的广泛关注。2003年5月，由新疆新能源研究所、合肥工业大学、合肥阳光电源三家单位组成产、学、研联合攻关团队，在成功开发与研制500W、3kW光伏并网系统、100kW柔性衬底非晶硅并网电站和50kW光伏电站计算机智能控制系统基础上，研制开发出三相60kW光伏并网逆变装置，并网电站于2005年3月27日在新疆新能源研究所建成并投入发电，至2005年8月27日，已累计发电25700kWh。     

光伏并网发电系统的孤岛效应与防止策略

该文详细地介绍和分析了光伏并网发电系统中可能出现的孤岛效应,提出了一种易于实现的防止策略,并通过Matlab软件仿真验证了方案的可行性.     

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。     

分布式光伏并网发电系统控制技术分析

21世纪的今天,全球性的能源短缺、环境污染、全球气候变暖等问题进程不多加快,资源开采逐渐跟不上时代的步伐。人类在不断困扰下发现了太阳能储蓄的“无限性、普遍性、开发利用清洁性”等优势,是可以代替我国能源的理想资源。太阳能资源非常的丰富,每年的理论储蓄量可以达到17000亿吨标准煤,而利用太阳能的最佳方式就是光伏发电。因为太阳能光伏发电的前景非常广阔,所以很多国内外的学者开始在发电领域展开了大量的研究工作。虽然光伏发电发展趋势好、各项技术相对来说也比较成熟,但在发电系统的控制上还存有不足,本文通过对分布式光伏并网发电系统的控制技术展开分析,希望可以提高光伏并网系统的运行效率与技能。     

黄石建设湖北最大太阳能光伏并网发电项目

近日,湖北黄石再启1个太阳能光伏并网发电项目,总投资1．3亿元,规划发电量6．6MW．预计今年底可实现并网发电。至此,黄石光伏发电应用项目建设规模达17．58MW,为湖北装机容量最大的光伏发电集中应用示范基地。     

基于DSP的光伏并网发电控制系统

概述了60 kW太阳能光伏并网发电系统总体设计,提出了以DSP为控制核心的系统新方案。该方案以CAN总线与RS232(485)串行通讯相结合,构建了光伏并网发电测控系统。由于采用了基于"零矢量"的无差拍电流控制策略,使并网逆变器在获得快速动态响应的同时,降低了功率管应力。通过相关试验验证了方案的正确性。     

光伏并网发电系统最大功率追踪算法的稳定性研究

随着光伏发电技术及光伏产业的发展,太阳电池阵列如何在同样日照、温度的条件下输出尽可能多的电能成为人们的研究重点。然而,根据太阳电池的工作原理,当光照强度,温度等自然条件改变时,太阳电池的输出特性将随之改变,输出功率及最大工作点亦相应改变。分析了几种常见的最大功率跟踪方法（Maximum Power Point Tracking,简称MPPT）,针对扰动观测法中的误判现象进行分析,并加以改进,使系统更加平稳地输出有功功率,实现了对最大功率点的稳定追踪。     

光伏系统应用中的若干误区

阐述了光伏系统设计的重要意义,讨论了光伏系统设计的原则,并针对光伏系统设计和建造中存在的问题进行了分析。     

光伏并网发电防逆流装置的研制

介绍一种防逆流装置，该装置通过电气元件来控制光伏并网发电系统的并网与离网，从而实现不可逆流光伏并网发电系统。     

基于水库大坝的水能与太阳能融合型并网发电系统研究与应用

针对中国大中型面南的水库电站大坝,向光性比较好,具备安装太阳能光伏发电系统的条件,并使得2种可再生能源融合并网发电模式具有一定的创新性.水库电站的发电系统是已建成的,增加太阳能光伏发电系统并建设融合型并网发电系统,不仅体现了投资成本低发电效益高等特点,同时具有节约国土资源、保护大坝和节能减排等社会效益.在设计和实践过程...     

Direct power control of grid connected PV systems with three level NPC inverter

This paper presents the control of a three-level Neutral Point Clamped (NPC) voltage source inverter for grid connected photovoltaic (PV) systems. The control method used is the Extended Direct Power Control (EDPC), which is a generic approach for Direct Power Control (DPC) of multilevel inverters based on geometrical considerations. Maximum Power Point Tracking (MPPT) algorithms, that allow maximal power conversion into the grid, have been included. These methods are capable of extracting maximum power from each of the independent PV arrays connected to each DC link voltage level. The first one is a conventional MPPT which outputs DC link voltage references to EDPC. The second one is based on DPC concept. This new MPPT outputs power increment references to EDPC, thus avoiding the use of a DC link voltage regulator. The whole control system has been tested on a three-level NPC voltage source inverter connected to the grid and results confirm the validity of the method.     

Automatic fault detection in grid connected PV systems

This paper presents a detailed procedure for automatic supervision, fault detection, and diagnosis of possible failure sources leading to total or partial loss of productivity in grid connected PV systems. The diagnostic procedure is part of the monitoring system allowing, at the same time, modeling and simulation of the whole system and variables measurements in real time. The fault detection algorithm is based on the comparison of simulated and measured yields by analyzing the losses present in the system while the identification of the kind of fault is carried out by analyzing and comparing the amount of errors deviation of both DC current and voltage with respect to a set of errors thresholds evaluated on the basis of free fault system. The proposed method has been validated in with experimental data in a grid connected PV system in the Centre de Developpement des Energies Renouvelables (CDER) in Algeria.     

郭煌8MWp并网光伏发电系统預司行性研究

太阳能光伏发电技术已经成熟、可靠、实用，光伏电池使用寿命已经达到25～30年。     

Study on islanding of dispersed photovoltaic power systems connected to a utility power grid

Photovoltaic (PV) systems and other dispersed power systems need to be connected to a utility power grid for the systems to work effectively as energy sources. Protection against islanding is one of the most important techniques to develop for the dispersed power systems supplying surplus power back to the utility power grid. It is considered that active methods where the outputs of the power systems are actively perturbed are necessary to detect islanding. Various active methods have been developed. It has been shown that these methods work when a single power system is connected to one power distribution line. However, most of these methods have a limit in detecting islanding when multiple power systems are connected to one distribution line. In this paper, we compare the detection characteristics of typical active methods, frequency shift methods, a pulse perturbation method and a method using a correlation technique by simulation analysis for the case of multiple PV power systems. The study shows that the method using the correlation technique is the most promising when multiple power systems are operated on one distribution line.     

云南石林20MW光伏电站成功并网发电

<正>5月25日,设计装机容量位列亚洲第一的昆明石林光伏并网实验示范电站一期20MW项目正式并网发电。该电站采用了阳光电源的SunAccess系列大功率并网逆变器。     

Power characteristics of PV ensembles: experiences from the combined power production of 100 grid connected PV systems distributed over the area of Germany

Monitored data from 100 PV systems were used to study effects of combined power generation of these systems, compared to the characteristics of an individual system. The standard deviation curve of an average daily power generation profile of 1 month is significantly decreased for the ensemble and corresponds to predictions based on cross-correlation characteristics of the radiation field. Power fluctuations between the monitored time intervals of more than 5% of the installed power have disappeared. The analysed energy spectrum of the combined power generation reveals that the produced energy is generated in a range below 65% of the overall installed power. The ensemble of PV systems supplies a calculable fraction of PV power within a certain time window around noon in the summer period, underlining the capability of reliable power production of a PV ensemble.     

太阳能光伏并网发电系统仿真研究

太阳能光伏发电是可再生能源利用的一种重要形式。文章通过研究太阳能光伏发电并网系统的特性,建立了由光伏阵列、逆变器、控制器、电网等组成的太阳能光伏并网发电系统数学仿真模型。仿真系统动态模拟了光伏阵列输出、逆变器控制及发电并网等。模拟结果表明,系统较好地实现了安全并网,对实际光伏并网系统的设计具有一定的参考价值。     

THD reduction with reactive power compensation for fuzzy logic DVR based solar PV grid connected system

Dynamic voltage restorer (DVR) is used to protect sensitive loads from voltage disturbances of the distribution generation (DG) system. In this paper, a new control approach for the 200 kW solar photovoltaic grid connected system with perturb and observe maximum power point tracking (MPPT) technique is implemented. Power quality improvement with comparison is conducted during fault with proportional integral (PI) and artificial intelligence-based fuzzy logic controlled DVR. MPPT tracks the actual variable DC link voltage while deriving the maximum power from a photovoltaic array and maintains DC link voltage constant by changing modulation index of the converter. Simulation results during fault show that the fuzzy logic based DVR scheme demonstrates simultaneous exchange of active and reactive power with less total harmonic distortion (THD) present in voltage source converter (VSC) current and grid current with fast tracking of optimum operating point at unity power factor. Standards (IEEE-519/1547), stipulates that the current with THD greater than 5% cannot be injected into the grid by any distributed generation source. Simulation results and validations of MPPT technique and operation of fuzzy logic controlled DVR demonstrate the effectiveness of the proposed control schemes.     

基于DSP的光伏并网逆变系统的设计

介绍了基于DSP的光伏并网逆变系统的设计。系统采用TMS320F2407作为主控芯片,通过最大功率跟踪,使太阳电池动态工作在最大功率点上。运用电流预估计原理使输出性能得到提高,通过软件锁相使输出电流同步跟踪电网电压相位,并具有电网掉电识别、过流、欠压和监控等功能,保证了光伏并网发电的安全运行,并具有远程通讯功能。     

Design of grid connected PV systems considering electrical, economical and environmental aspects: A practical case

This paper presents the complete design of a photovoltaic installation that may be either used for internal electric consumption or for sale using the premium subsidy awarded by the Spanish Government. Electric optimization strategies are detailed in the project, as well as the sizing of the photovoltaic installation and economic and financial issues related to it. The project optimizes the electricity demand, improving reactive power and studying the convenience of hourly discrimination fees in addition to the design of the photovoltaic installation. A specific computer application for the automated calculation of all relevant parameters of the installation—physical, electrical, economical as well as ecological—has been developed to make the process of calculating photovoltaic installations easier and to reduce the design development time. Moreover, the budget of the photovoltaic installation is included, as well as its corresponding financial ratios and payback periods. Finally, the conclusions reached in the technical and economic design of the installation are shown.