Qi Shuguang

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Two voltage levels of High voltage Direct Current (HVDC) systems in China are discussed in this paper. Their rated voltage are 240V and 336V (corresponding working voltages are 276V and 380V). After introducing the principle of the HVDC system, we reviewed the main characteristics \including the voltage ranges, system reliability and maintainability of HVDC(More)
By using one of image processing technology direct to sun smart tracking methods, we can properly rotate solar energy collecting devices such as solar water heaters and solar panels, making them straight to sun to improve the efficiency of collecting solar energy. In the process of image processing, we use hough transform to abstract straight lines and(More)
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