PV System for Medical Devices in the Hospital

Abstract

In this thesis, a boost chopper using pv system and PWM(Pulse Width Modulation) voltage type power converter were constructed to provide a pleasant environment to the patients in the hospital wards by controlling temperature, humidity and air-conditioning and heating. For the stable modulation of solar cell, synchronizing signal and control signal were processed using one chip microprocessor. Power converter system was constructed with booster chopper and voltage source inverter and test was carried out for both devices. Constant voltage control method was used to track a maximum power point at boost converter control. For the inverter control, synchronizing signal and control signal were processed by microprocessor according to the switching theory of SPWM(Sinusoidal pulse Width Modulation), directions to each sector and stable modulation. Test was carried out for inverter control using SPWM control method. In addition, grid voltage was detected and this grid voltage and inverter output were operated at the same phase for the phase locking with PWM voltage source inverter so that surplus power could be linked to grid. This characteristics were applied on the temperature and humidity sensors in the general buildings and buildings of specific purpose such as hospitals. The good dynamic characteristic of inverter could be obtained by these applications.