Research On In-site Tester Of Solar Array Characteristic

With economic development, the energy issue has become more prominent. As a renewable energy, photovoltaic industry will have greater room for development. For the rational configuration of the solar arrays in a solar power station, improving efficiency and reducing the costs of power generation, there it is necessary for to test and analyse the characteristics of the solar arrays of on-in site testing and analysis. After comparing the existing solar array site testing methods, in the paper , capacitance charging dynamic testing method is adopted and a solar array tester prototype is designed, that which is based on TI's TMS320F2806DSP .The main points and new points in this paper as follows:1. There are four sampling channels that cover different scales for each sampling voltage and current respectively in the hardware circuit of the testing-control part based on TMS320F2806DSP. During sampling ,software can automatically select the most suitable scale to improve the large-scale measurement accuracy.2. In addition to pre-sampling method to select suitable testing scale and sampling period for voltage and current sampling, the formula estimating method is tried. Compared to pre-sampling method , formula estimating method only need to conduct capacitor charging and discharging operation at a time, whick makes the testing process more rapidly.3. The voltage data on the test was reformed from small to large ;the current data was handled in Digital Filter,using the recurrence deduce median value method. This can reduce sampling errors which are aused by the pulse of accidental interference .4. The auxiliary power supply, testing -control circuit and LCD are integrated together so that the characteristics of the solar arrays can be measured and displayed at the same time by the prototype tester;5. Both the solar cells' mathematical model and the measured data can be used to estimate and analysis characteristic curve of the solar array.The experiment results via testing the actual solar arrays show that the testing system operates stabely, easy to carry,has with higher measurement accuracy, a complete testing will take about 10s, measurement process is rapid, and the measured characteristics of solar arrays can displayed on LCD directly in the form of a curve that made the characteristics of solar arrays more illustratable and comprehensible. It can meet the needs of engineering.