基于MIS系统的火电厂能损实时监测系统

能损实时监测系统的开发和使用是目前火力发电厂实现经济运行和强化生产管理的重要措施之一,也是竞价上网政策实施的前提和关键。实现能损实时监测关键的实时参数的采集。传统的能损监测系统一般通过分布式智能数采前端和通讯卡为硬件条件,通过对硬件的组态及运用软件研发而完成;而本系统的数据采集是利用电厂现有的MIS系统,通过与Intranet内部的局域网网络通信实现的,因此不需要数据采集的硬件装置和软件设计,不仅简化了系统,节约了投资,还缩短了系统开发周期。对系统的整体情况做以介绍。     

基于GPRS的风光互补发电无线远程监测系统

采用ATmega128单片机以及SIM300模块设计了基于通用分组无线业务(GPRS)的无线数据采集系统,对风光互补发电系统进行远程数据监测,并将数据传送到计算机网络服务器。文章介绍了无线GPRS监测系统的硬件和软件原理及设计方案。     

基于PXI技术的全功率风电变流器监测系统

在风力发电并网全功率变流器的研发过程中,为了测试和验证变流器的运行性能,需要一个变流器监测系统,不仅能够满足大量通道的高速数据采集,同时还要具有故障报警、录波、以及数据分析的能力。提出了并实现了一种基于PXI技术的3MW全功率变流器监测系统以满足上述的要求。详细描述了监测系统软硬件的实现方法,并且给出了大数据量监测系统的实时性问题的软件解决方法。在最后,给出了监测系统在3MW变流器实际调试过程中捕捉并记录下变流器故障的实例,表明了所提出的变流器监测系统的实效性。     

基于智能仪表调节的物料流量监测控制系统的研究与设计

基于智能仪表控制的物料流量监测调节系统的分析与设计,实现对物料管路流量的动态监测和调节控制。借助数据采集平台与流量监测系统硬件通信,实现数据的采集与处理,监测流量的实时动态并根据需要进行调节。智能仪表、涡轮流量变送器、PID调节、水泵、NI数据采集卡、实验水箱及管路等设备构成了本系统的硬件部分;LabVIEW虚拟仪器软件系统构成本系统的软件部分。经过现场实验分析与反复论证,本系统设计简化,程序简单,运行稳定,性能良好。     

基于风电场继电保护数字-物理动模闭环仿系统设计

文章研发了基于风电场并网的继电保护数字-物理动模闭环仿真系统检验平台,平台采用DDRTS电磁暂态仿真软件编程实现了对风电场电流实测数据进行波形动态回放的功能,同时利用仿真软件搭建了直驱、双馈风电机组模块,计算其风电场并网系统保护定值。构建了含微机保护装置、模拟断路器的硬件模拟系统,通过DDRTS输入输出连接完成闭环实时仿真系统。应用某地区风电并网系统对该动模仿真系统平台进行了试验验证,结果表明其能够进行正确检验。     

大型集中并网光伏电站硬件设计要求及安全保护

主要从大型并网光伏电站的硬件设计要求和安全方面对系统进行了阐述,并根据主要硬件设备的设计要求满足系统的整体要求.通过对太阳电池的选型及支架的设计、功率变换器(包括逆变器和并网保护装置)、控制监测装置等方面进行论述及对并网光伏电站及人员的安全保护,尤其是在避雷、防雷、接地和"孤岛效应"的防护方面进行详细分析,表明在设计过程中应根据实际情况及正确的设计要求选择合适的硬件设备,并加强安全保护.     

JXX型内燃机数据采集分析系统的研制

本文结合我国国情开发了ＪＸＸ型内燃机数据采集分析系统，该系统用少量硬件和自行研制的软件，加上ＩＢＭ３８６／４８６微机和多种输出设备，实现了内燃机的数据采集和燃烧分析，并介绍了该系统的结构、工作原理、功能和特点，讨论了提高该系统精度的措施。     

高压变频调速装置监测系统的设计与实现

结合三电平高压变频调速装置的结构特点,对其运行状态在线监测系统的功能需求进行了分析探讨。提出了监测系统的硬件构成方式和功能配置方案。介绍了监测系统的基本硬件结构、监测量的组成、运行数据记录格式以及相关软件的设计特点和实现方法。     

多逆变器并网稳定性分析

随着微网的快速发展,光伏渗透率逐渐增高。在多逆变器并网情况下,常采用电容电流反馈的虚拟阻尼方法来抑制谐振并网时产生的谐振。文章基于多台逆变器并网的闭环阻尼模型,分析了并网逆变器在硬件相同但软件参数不同情况下的多逆变器并网谐振阻尼特性,并采用传递函数闭环零极点的变化轨迹分析阻尼系数对多逆变器并网系统稳定性的影响。最后利用Matlab/simulink软件对所提出的控制策略进行了仿真,仿真结果表明,所提出的控制策略能保证系统的稳定性,并且有效地抑制并网谐振。     

JXX型内燃机数据采集分析系统的研制

本文结合我国国情开发了ＪＸＸ型内燃机数据采集分析系统，该系统用少量硬件和自行研制的软件，加上ＩＢＭ３８６／４８６微机和多种输出设备，实现了内燃机的数据采集和燃烧分析，并介绍了该系统的结构、工作原理、功能和特点，讨论了提高该系统精度的措施。     

Development of autonomous monitoring and performance evaluation system of grid-tied photovoltaic station

This work aims to improve the existing monitoring systems MS for two grid-connected PV stations GCPVS of URERMS ADRAR, to eliminate its limitations. This improvement consists of developing an MS which is used for two PV stations with different configurations. This MS contains new LabVIEW-based monitoring software for visualizing real-time measured data and evaluating GCPVS performance. In addition, it illustrates the 2D and 3D real-time relationships of PV system parameters, which allow us to understand the dynamic behavior of PV system components. This developed monitoring software synchronizes also the various data acquisition units DAU of GCPVS, allowing simultaneous data access.To perform a reliable performance analysis and a comparative study of different GCPVS based on accurate measurements, the sensor's calibration is performed with its DAU. The MS autonomy is ensured by integrating developed PV-UPS. A graphical user interface is provided for the evaluation of PV-UPS performance.     

Potential and viability of grid-connected solar PV system in Bangladesh

The potential of grid-connected solar PV system in Bangladesh was estimated utilizing GeoSpatial toolkit, NASA SSE solar radiation data and HOMER optimization software. Financial viability of solar photovoltaic as an electricity generation source for Bangladesh was also assessed utilizing a proposed 1-MW grid-connected solar PV system using RETScreen simulation software for 14 widespread locations in Bangladesh. The technical potential of gird-connected solar PV in Bangladesh was calculated as about 50174 MW. The annual electricity generation of the proposed system varied depending on the location between 1653 MWh and 1854 MWh, with a mean value of 1729 MWh. Several different economic and financial indicators were calculated, such as the internal rate of return, net present value, benefit-cost ratio, cost of energy production and simple payback. All indicators – for all sites – showed favorable condition for development of the proposed solar PV system in Bangladesh. The results also showed that a minimum of 1423 tons of greenhouse gas emissions can be avoided annually utilizing the proposed system at any part of the country.     

规模化光伏电站与电网暂态交互影响定量分析

在电力系统暂态安全定量分析软件平台FASTEST(Fast Analysis of Stability using the Extended equal areacriterion and Simulation Technologies)上以研究规模化光伏电站接入系统后的稳定性分析为目的,建立了一个完整而且适合系统安全稳定分析的并网光伏电站机电暂态模型。基于FASTEST特有的暂态稳定量化分析功能,对并网光伏电站被浮云遮挡和系统侧发生扰动这2种典型情况进行仿真分析,从对系统暂态功角稳定性、暂态电压稳定性和暂态频率稳定性的影响的角度,探讨光伏电站与常规电源在影响电网运行特性方面的区别。结果表明,光伏电站并网后对系统暂态频率稳定性影响最为严重,相比较于带有励磁和调速系统的同步发电机,光伏电站在网侧故障时的暂态响应特性更为剧烈。     

光伏并网逆变器的群控技术

并网逆变器作为光伏发电系统的核心装置,对系统的运行效率有重要影响。群控技术是一种有效提高系统运行效率的手段。文章首先对群控技术进行了详细的描述,随后对采用具有群控功能的逆变器构成的发电系统与采用常规逆变器构成的发电系统的实际发电量进行了统计与分析。实际运行结果表明,群控技术可以在一定程度上提高系统发电量。     

Assesment of grid-connected photovoltaic systems in the Kuwaiti climate

Grid-connected photovoltaic (PV) systems is one of the most promising applications of PV systems. Till now, no detailed studies have been carried out to assess the potential of grid-connected systems in Kuwait. This work investigates the feasibility of implementing grid-connected PV systems in the Kuwaiti climate. The proposed system consists of crystalline solar modules mounted on the building roof and an inverter to convert PV dc output to ac voltage. The building receives electricity from both the PV array and the utility grid. In this system, the load is the total electrical energy consumption in the building.The objective of this work is to examine the performance as well as the economic feasibility of grid-connected PV systems in the Kuwaiti climate. A program is written to evaluate the performance as well as the economic feasibility of such systems in Kuwait. The input to the program is the weather data for Kuwait, time dependent building loads, as well as the utility rates for Kuwait. Weather data generator subroutine included in the program is used to generate hourly weather conditions from the monthly average values of daily radiation on horizontal surface, and ambient temperature available for Kuwait. The five-parameter PV model, which is applicable to both crystalline and amorphous PV modules, is used to determine the performance of the solar modules used in this study.The transient simulation program ( ) is used to link the components of the grid-connected PV system together. The inverter efficiency is represented as a linear function of input power. In this case, it is assumed that the AC output from the system will never be greater than the building load. Electricity tariffs will have an important impact on the cost-effectiveness of the system studied. The tariff used for electric utility is a flat rate per unit kWh of electrical energy. Simulations of the proposed system were carried out over the academic year.The building examined in this study is a flat roof building with a single story. The building roof area is large enough so that the PV arrays can be spaced widely to minimize shading losses. Different array slopes, and azimuth angles were studied to maximize the annual energy generated by the PV modules. Finally, the economic feasibility of grid-connected PV systems in Kuwait are examined.     

Analysis of grid connected solar PV system in the southeastern part of Bangladesh

Bangladesh is a potential site of implementing renewable energy system to reduce the severe power crisis throughout the year. According to this, Chittagong is the southeastern part of Bangladesh is also a potential site for implementing renewable energy system such as grid-connected photovoltaic (PV) system. Financial viability and green-house gas emission reduction of solar PV as an electricity generation source are assessed for 500 kW grid connected solar PV system at University of Chittagong, Chittagong. Homer simulation software and monthly average solar radiation data from NASA is used for this task. In the proposed system monthly electricity generation varies between 82.65 MW h and 60.3 MW h throughout the year with a mean value of 68.25 MW h depending on the monthly highest and lowest solar radiation data. It is found that per unit electricity production cost is US$ 0.20 based on project lifetime 25 years. The IRR, equity payback and benefit-cost ratio shows favorable condition for development of the proposed solar PV system in this site. A minimum 664 tones of green-house gas emissions can be reduced annually utilizing the proposed system.     

200 MW大型并网光伏电站智能化信息管理方案

以青海格尔木一期200 MW集中式大型并网光伏电站为例,介绍了光伏电站智能化信息管理系统的实际应用情况,并以2012年8月份的电站生产运行数据为基础,对电站运行情况进行了详细评价。结果表明,光伏电站智能化信息管理系统规范了格尔木一期并网光伏电站的编码、生产运行指标和管理过程,提高了各部门之间的配合与协作,实现了光伏电站的资源集成与数据共享。     

与景观结合的奥运森林公园并网光伏发电系统

并网光伏发电系统与奥运森林公园景观相结合,体现了"绿色奥运、科技奥运、人文奥运"三大理念,是清洁能源技术在奥运会中的应用。并网光伏发电系统设计中采用了MPPT技术、防孤岛效应技术、逆功率反送保护技术和完善的并网光伏发电系统监控技术,提高了并网光伏发电系统运行的可靠性和电网的安全性。奥运期间奥运区域供电等级提升为特级,为满足供电可靠性,示范电站采用带功率流向检测的并网模式,当并网光伏发电系统的有功功率超过指定负载的有功功率时,切断并网光伏发电系统,防止电能馈入电网。     

Grid-connected building-integrated photovoltaics: a Hong Kong case study

The first building-integrated photovoltaic system (BIPV) in Hong Kong has been working successfully for three years, as remote system for the first year and grid-connected system in the last two years. A number of issues have been investigated on the experimental system including technical, economical, operation and management topics. This paper presents the findings from this research project funded by the Industrial Support Fund of the Hong Kong SAR Government. Simulation and data monitoring have been completed for energy performance of the BIPV system under Hong Kong weather conditions. The natural ventilation effect of an air gap on PV module’s power output and heat transfer across the PV wall and PV-roof have been investigated. Good agreement between simulation and experimental results was achieved. The system can provide about 41% of electric power for an indoor lighting floor area circuit of 250 m². The harmonics of the power output from the PV system was also measured to check the interference level to the utility grid. Experiments show that the total harmonics current distortion of the grid-connected BIPV system is far lower than that from some conventional equipment, such as personal computers. The total harmonics from this BIPV system is less than 12% for most of the time, even when the incident solar irradiation is very weak.     

Performance results and analysis of 3 kW grid-connected PV systems

Four 3 kW grid-connected photovoltaic (PV) generation systems have been installed and monitored at the Field Demonstration Test Center in Korea since October 2002. To observe the overall effect of meteorological conditions on their operation characteristics by field test, the monitoring system has been constructed for measuring and analyzing the performance of PV systems and components in November 2002. In this paper, the performance of PV systems is evaluated and analyzed not only for component perspective but also for global perspective by reviewing one year of monitoring results and loss factors of PV systems. On the basis of these monitoring results, the performance of PV systems is compared to the measured performance of PV systems with the estimated performance by simulation. These results will indicate that it is highly imperative to develop evaluation, analysis and application technology for PV systems.