Wireless Data Acquisition for Photovoltaic Power System Makbul Anwari', Anwari I, Arief AriefHidayat Hidayat',I, M. Itnran Imran Hamid', HamidI, and Taufik' Taufik2 'Faculty IFaculty of Electrical Engineering, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia Electrical Engineering Department, Cal Poly State University, San Luis Obispo, USA E-mail: E-mail :
[email protected] Abstract This paper presents a wireless system for monitoring monitoring the input and output of the array in a photovoltaic generation plant. The system comprises of sensors, data data acquisition system, wireless access point and user computer that enable the users to access the array parameter wirelessly. Description and function of set up equipment are presented as well as the application program that supports the system. 1. l. INTRODUCTION
Recently, the number of energy in the world is reaching to concern state. This is caused by the need of energy is growing very fast. Due to concerns regarding global warming and air pollution, there has been an international movement in the renewable energy technologies for electricity promotion promotion of renewable generation, green energy is one among proposed solutions for these issues [l]. [I]. Solar energy is converted to electricity in a photovoltaic generation plant that contains photovoltaic array as solar electricity conversion equipment, electrical electrical power converter, power storage and other supporting equipment. According to operation mode, photovoltaic generation plants are met in isolation mode, grid interconnected mode and plant that can modes.. For all of these modes, there are needs operate in both modes to acquire the input and output parameter of the photovoltaic array as the generation equipment. The acquired parameters
are used for control action information, generation generation planning, energy forecasting, and performance observation or documentation need. Some of the parameters are irradiance, temperature and array's electrical electrical output. A satisfied data acquisition system is required for this need. Related to acquisition system for photovoltaic performance, ai. have accomplished a research in which, Benghanem et aI. instruments are used to detect, integrate, and record several instruments solar energy measurement using both conventional electronics as well as microprocessor data acquisition system [2]. Further, Machacek et aI., developed a system for measuring, collecting, analyzing, and displaying data for 100 W solar energy converter, data acquisition is formed by NI-6023E plug-in card and feed the rough data to the control program built in a MATLAB script [3]. Data from acquisition system module are needed to produce useful information. The speed of the process is the important parameter. To accommodate this requirement, during the past decade, digital control has been widely used. Digital control, which is determined by application of microprocessors, makes the sampling and computing process are faster than before. Implementation of such a system has been done on a dc voltage monitoring and control system for a wind turbine inverter [4].
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Regarding with data transmission, Chen,et.al, have studied carrying the acquired signal from data acquisition module using internet [1]. Java language is used for designing a dynamic webpage to graphically display various real time waveforms of the controlled system for multi-user at the same time. The system is implemented on a small scale wind power time. generation system equipped with an EZDSP 2812 controller. An FPGA ECIO is implemented as a bidirectional communication interface for coordinating the asynchronous data transmission modes. In this paper, we present a photovoltaic generation monitoring system for a 5 kWp laboratory scale photovoltaic generation. Temperature, irradiance, voltage, and current of the array are acquired, processed and then transmitted such that can be used for reviewing the performance of the generation plant. Acquired data is transmitted by wireless method using Wi-Fi signal (IEEE 802.11 802.11 standard), while of PIC 16F877A is used to control the microcontroller of acquisition system process and a Delphi application program is built to graphically display the acquired data. Figure 1 show the simplified diagram of of such system. II. PV GENERATION GENERATIONCHARACTERISTIC CHARACTERISTIC FOR FOR MONITORING MONITORING SYSTEM SYSTEM
The acquisition system is aimed to detect and collect the parameters that indicate the electrical characteristic of the array and the factors influencing them.
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The authors thank the Malaysian Government, Ministry of Science, Technology and Innovation (MOST!) for the Science Fund Grant, Project No. 01-0 1-06-SF0205.
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VI. REFERENCES REFERENCES [I]
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