Paper Title

This research proposed method to electrical peak demand control in hotel building by programmable logic control. Touch screen display is used for shows the electrical parameters data and setting the electric peak demand setpoint via communication port RS232C to the PLC. The power and energy meter is used for receive the electrical power signal from sensors and sending the signal data through serial port RS 485 to the PLC. PLC will process all data and send control signal to control the electric loads in order to reduce the electrical peak demand (Maximum Demand) charge. In hotel building, the electrical bill is charged on electrical peak demand from coefficient of electrical peak demand at each month (Demand Factor). This research firstly study and checks the power of all electrical loads in the hotel then grouping the same load and arrangement the priority of loads to on-off or dimming its. Three types of electrical load are simulated and installed its. A part of software, PLC controller is programmed and simulated test before using its to control the real electrical loads. The samplings of peak demand setpoint are set at 10 kW, 9 kW, 8kW, and 6 kW. Result of experimental found that the peak demand control system is correct operation cover the boundary condition of research and the proposed method is approached to the setting point better than the conventional method about 1.2 to 7.3 percent.