On the other hand, DAS is an imported technology for most developing countries, meaning high cost and a barrier to the dissemination of such systems. The design and implementation of a low cost DAS is motivated by the need www.selleckchem.com/products/chir-99021-ct99021-hcl.html to offer an alternative for commercial systems, which are more expensive, usually imported and have proprietary software. In additional to this, commercial DAS do not allow amendments and adjustments to hardware nor software.2.?Literature Review of DAS Applied to RE PlantsThe rapid development of the use of RE over the last decades has resulted in many plants being installed throughout the world. However, this effort requires, as a first step, a detailed knowledge of the meteorological data of the plant site; as a second step, operational values from similar RE plants are necessary to increase the technology reliability.
Balan et al. [3] presented a microcontroller-based DAS in which values of total and diffuse solar radiation intensities are captured by a microcontroller, using an electronic conversion module. The transmission of recorded values to a PC is carried out using a RS-232 serial Inhibitors,Modulators,Libraries interface. The acquisition software operates with a time step of 50 seconds, thereby reading and storing into a database the total and diffused solar radiation values. The database (MySQL type) is designed to store the values of measured solar radiation intensities and allows Inhibitors,Modulators,Libraries their interrogation via internet. In this manner, the PC also acts as a server computer for distance monitoring.Belmili et al. [4] presented a microcontroller-based DAS for the characterization of PV modules under real meteorological test conditions.
The DAS communication Inhibitors,Modulators,Libraries channel is a TTL/RS-232 Inhibitors,Modulators,Libraries transceiver that permits the serial interfacing between a microcontroller with Transistor-Transistor Logic (TTL) voltage levels and a computer (RS-232 voltage levels). The basic element of the DAS hardware is an electronic load based on MOSFET. The microcontroller is the central element of the designed DAS card, executing AV-951 the electronic load variation, the analog-digital conversion from the solar irradiance, the communication with the 1-Wire temperature sensor and the data transmission to and from the computer via RS-232 interface. By using different buttons on a computer graphical interface, it is possible to visualize the results of the module characterization.
A radio frequency (RF) wireless DAS was developed this in [5] with a set of sensors for measuring meteorological parameters (solar radiation, wind direction and speed, temperature, humidity and barometric pressure). The wireless DAS consists of two stations: a remote station (with sensors, microcontroller, RF emitter circuit and power supply) and a base station (with a RF receiver circuit, microcontroller, RS-232 serial interface and a computer with graphical environment software for processing, displaying and storing the collected data).