1. Development of a test facility for photovoltaic-diesel hybrid energy systems
B. Wicherta, M. Dymondb, W. Lawrancea and T. Friesea
a Department of Electrical Engineering, CRESTA, Curtin University of Technology, PO Box U 1987, Perth 6845 WA, Australia
b Advanced Energy Systems, 14 Brodie Hall Drive, Bentley, 6102 WA, Australia
To quantify the potential for performance improvements of photovoltaic-diesel (PV-diesel) hybrid energy systems, a test facility has been installed at the Centre for Renewable Energy Systems Technology. The research facility is part of the cooperative program to develop improved power conditioning systems for the provision of electricity in remote areas (ACRE Project 4.1). A customised control interface has been developed using the control and data acquisition software, LabVIEW. The graphical user-interface supports the automatic or manual definition of control parameters, which allows the system designer to apply optimal control methods for the management of PV-diesel hybrid energy systems. Continuously monitored weather data supports the integration of photovoltaic resource and load demand forecasts as part of the control strategy. The paper describes the developed test facility and discusses the potential for performance improvements of stand-alone renewable energy systems, which can be achieved through the application of “intelligent” energy management strategies.
Corresponding author. Tel.: +61-8-9266-2960; fax: +61-8-9266-3107; email: firstname.lastname@example.org
Available at: http://dx.doi.org/10.1016/S0960-1481(00)00024-0
2. A LabVIEW Based Instrumentation System for a Wind-Solar Hybrid Power Station
Dr. Recayi Pecen, Dr. MD Salim, & Mr. Ayhan Zora
Renewable energy technologies range from the well established, such as hydropower, to the emergent, such as a wind-solar hybrid system. Each technology has its own individual instrumentation requirements to measure and control system variables. National Instrument’s LabVIEW data acquisition hardware and software module has become one of the most widely used tools to capture, view, and process controls, instrumentation, and power system data both in academia and the industry (Franz, 2003, and Travis, 2002). This paper describes a LabVIEW based real time data acquisition and instrumentation of a 1.5 kW wind-solar hybrid renewable energy system. The wind-solar power generation station is used as an instructional resource for teaching renewable energy concepts to Industrial Technology students at the University of Northern Iowa (UNI). The addition of the new LabVIEW module to the system provides the much needed real time information on the system variables, such as wind speed, wind direction, dc power, ac power, ac/dc voltages and currents. This real-time data acquisition system is being used extensively to provide the students a hands-on laboratory experience related to electrical, electronics, and instrumentation. In this paper, discussions on many aspects of data acquisition, instrumentation, interfacing, and programming are based on an existing 1.5 kW wind-solar hybrid power station at the University of Northern Iowa.
Full paper available at: http://www.nait.org/jit/Articles/pecen070104.pdf
3. Development of an integrated data-acquisition system for renewable energy sources systems monitoring
Eftichios Koutroulis and Kostas Kalaitzakis
Department of Electronics and Computer Engineering, Technical University of Crete, GR-73100, Chania, Greece
Data-acquisition systems are widely used in renewable energy source (RES) applications in order to collect data regarding the installed system performance, for evaluation purposes. In this paper, the development of a computer-based system for RES systems monitoring is described. The proposed system consists of a set of sensors for measuring both meteorological (e.g. temperature, humidity etc.) and electrical parameters (photovoltaics voltage and current etc.). The collected data are first conditioned using precision electronic circuits and then interfaced to a PC using a data-acquisition card. The LABVIEW program is used to further process, display and store the collected data in the PC disk. The proposed architecture permits the rapid system development and has the advantage of flexibility in the case of changes, while it can be easily extended for controlling the RES system operation.
Subject-index terms: Renewable energy sources; Data-acquisition system; Microcomputer; Sensors; LABVIEW
Available at: http://dx.doi.org/10.1016/S0960-1481(01)00197-5
4. Development of a LabVIEW-based test facility for standalone PV systems
Alex See Kok Bin, Shen Weixiang, Ong Kok Seng, Ramanathan, S., Low I-Wern
Sch. of Eng., Monash Univ., Selangor Darul Ehsan, Malaysia;
To quantify the potential for performance improvement of a standalone photovoltaic (PV) system, a test facility has been installed. This paper describes this development of a prototype standalone PV system. Essentially this entire system involves the integration of a personal computer (PC), data acquisition (DAQ), a battery array and a solar array simulator (SAS) to create a standalone PV system and to test and simulate the system. This new system boasts of high accuracy measurements coupled with the commercial viability of low cost. The basic idea of this facility is that the SAS simulates solar power which is utilized to charge batteries. The information obtained by monitoring parameters, such as average battery's temperature, voltage and current is fed to the PC via the DAQ for analysis. This customized control interface has been developed by utilizing LabVIEW software, which forms the programming backbone of inter-instrument communication via IEEE-GPIB bus. The software created for this system is highly generic and can be used for other instances where different hardware is used. This paper also discussed further research plan, in utilizing this standalone PV system to perform load analysis and batteries charging or discharging with the inputs to the SAS with actual meteorological data obtained from the Malaysian meteorological department.
This paper appears in: Electronic Design, Test and Applications, 2006. DELTA 2006. Third IEEE International Workshop on
Publication Date: 17-19 Jan. 2006
On page(s): 6 pp.-
INSPEC Accession Number: 8978734
Digital Object Identifier: 10.1109/DELTA.2006.36
Posted online: 2006-01-30 09:08:57.0
5. Development of a monitoring system for a PV solar plant
N. Foreroa, J. Hernándezb, and G. Gordilloc
aLicenciatura en Física, Universidad Distrital, Bogotá, Colombia
bDepartamento de Ingeniería Eléctrica, Universidad Nacional de Colombia, Bogotá, Colombia
cDepartamento de Física, Universidad Nacional de Colombia, Bogotá, Colombia
The aim of this paper is to introduce a system developed for monitoring PV solar plants using a novel procedure based on virtual instrumentation. The measurements and processing of the data are made using high precision I/O modular FieldPoint (FP) devices as hardware, a data acquisition card as software and the package of graphic programming, LabVIEW. The system is able to store and display both the collected data of the environmental variables and the PV plant electrical output parameters, including the plant I–V curve. A relevant aspect of this work is the development of a unit that allows automatic measuring of the solar plant I–V curve using a car battery as power supply. The system has been in operation during the last two years and all its units have functioned well.
Keywords: Solar plant; Automatic data acquisition system; I/O modular devices; Virtual instrumentation; LabVIEW
Corresponding author. Tel.: +57 1 3165000x13019; fax: +57 1 3165135.
6. Development of Equipment for Monitoring PV Power Plants, using Virtual Instrumentation
Aristizabal, A.J., Arredondo, C.A., Hernandez, J., Gordillo, G.
Dept. de Fisica, Univ. Nacional de Colombia, Bogota;
In this work is introduced a system for monitoring the performance of PV power plants using the virtual instrumentation concept. It will use a hardware based on the National Instruments SCXI system and as software the Lab VIEW graphical programming package. The equipment is capable of real time signal measuring giving information about the performance of the PV power plant, as well as of the energy quality generated by it. Additionally, the equipment can also be used for measuring ambient variables like solar radiation and ambient temperature and for analyzing the energy quality of conventional electricity grid supplied to typical loads in commercial and residential sectors. The equipment was used during one year for monitoring both, the performance and the energy quality of a PV power plant, interconnected to the local grid under the BIPVS (building integrated photovoltaic systems) concept, in order to test its performance and reliability. The results indicated that the reliability and the accuracy of the monitoring system is excellent and than the tested PV power plant fulfilled the national and international quality standards demanded for PV generation. A description of the monitoring system as well as the daily irradiation in Bogota for every month of year 2005, is included in this paper. The behavior of the parameters characterizing the energy quality (percentage of the total harmonic distortion %THD, harmonic components, frequency, voltage of the PV system, flicker and power factor) are also reported.
This paper appears in: Photovoltaic Energy Conversion, Conference Record of the 2006 IEEE 4th World Conference on
Publication Date: May 2006
Volume: 2, On page(s): 2367-2370
Location: Waikoloa, HI,
INSPEC Accession Number: 9251686
Digital Object Identifier: 10.1109/WCPEC.2006.279667
Posted online: 2007-01-15 13:04:54.0
7. Novel Control of a Permanent Magnet Linear Generator for Ocean Wave Energy Applications
Aaron H. VanderMeulen
Wave energy conversion devices are a rapidly growing interest worldwide for the potential to harness a sustainable and renewable energy source. Due to the oscillatory nature of ocean waves, the power generated from a permanent magnet linear generator (PMLG) for ocean wave energy conversion is pulsed. Focusing on direct drive technology, the PMLG directly translates the motion of the waves into electrical energy. The power generated, left unconditioned, is not easily used or stored.
With conventional diode rectification topologies, line currents can not be controlled easily, resulting in an uncontrolled generator output and force. With an active rectifier topology, the real and reactive power from the PMLG is fully controllable. This thesis will investigate the generator modeling and design of a novel three-phase active rectifier topology and force controller with a dc-dc converter for bus voltage regulation. An in depth analysis for the controller design and simulations are presented. Hardware for the three-phase active rectifier is specified and built with initial lab test results. The controller design is implemented with National Instruments LabVIEW and compiled on a CompactRIO real-time controller.
Full paper available at: http://ir.library.oregonstate.edu/dspace/handle/1957/5921