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It's necessary to measure each monomer cell voltage of the fuelcell stack in order to ensure fuelcell stack to operate normally. Therefore, a host computer monitoring management software for fuelcell voltage polling measurement based on virtual instrument programming software LabVIEW8.5 was developed. The host computer monitoring management software could show fuelcell's operation voltage to user...
LabVIEW is a graphic programming language and widely used in measurement and control systems, but it don't have the ability of formal verification, this may cause potential hazards of conflict, collision and deadlock in large and complex measurement systems. This paper uses Petri net to model and analyse measurement and control system, then mappes it into LabVIEW. The two graphic languages are easy...
Recently, voltage variation and flicker events in a power system are concerned by both of utility and customers. Actually, these two events are always measured separately, but in a certain cases they can happen successively. Voltage variation may cause equipments dropout or failure and result in huge economic losses; while voltage flicker will interfere human vision. In order to discriminate voltage...
The interharmonics monitoring system of power network was developed based on virtual instrument. The system consists of sensors, signal conditioning circuits, data acquisitions and computers. Within the system, the method of multiple signal classification(MUSIC) method was applied to virtual instrument by using the MATLAB script node in LabVIEW, the parameters of interharmonics are identified, some...
The project team apply the design software on virtual instrument terrace to develop the testing equipment and host computer software possessing general function. In the application instance, making the water resource heat pump machine set as the testing object .The testing equipment and host computer software cover the physical quantity and parameter required to be tested during the testing procedure...
A new harmonic analysis equipment based on wavelet transform (WT) and virtual instrument(VI)is generated in the paper, in hope of overcoming the disadvantages of traditional harmonic analysis such as low data processing ability and high-cost . We implemented real-time harmonic analysis for welding machine no-load voltage under this method. Compared with experimental data obtained by FLUKE 43B, this...
In this letter, a power-quality measurement network for the power system is proposed to integrate electric measurement units with the Internet, global positioning system (GPS), and Linux, Apache, MySQL, PHP (LAMP). A synchronized sensor network is formed to monitor the system's dynamics in a wide-area sense. CompactRIO by National Instruments is used as measurement units to capture voltage at the...
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