Abstract:
This thesis proposes the design of the 12-Pulse AC to DC converter for small hydro generator connected to the grid system. This converter can reduce current harmonic component value in electrical power system and increase the DC output voltage was two times, compared with typical structure of the 6-Pulse AC to DC converter.
To design 12-Pulse converter control circuit of constant DC output voltage is necessary by using control technique 2 sets PI controller. The driver signal is generated using PWM technique for driving IGBT devices. The simulation method used a MATLAB/Simulink environment. The experiment of this thesis was setup via dSPACE DS1104 board in the laboratory level.
The simulation is modeled in MATLAB/Simulink using the 5 kW and 10 kW as resistive load. This converter can control the DC output voltage at 650V 7.5A and 15A, respectively. The experiment is set with the same condition as simulation model, under the limitation of devices rating. The experiment result showed that the converter can control the DC output voltage at 400V 4.8A and 9A, respectively. Therefore, the proposed converter can control the output voltage that can reliable operate under laboratory condition, although when the load was increased. The current harmonic component value compared between the simulation and experiment result, is difference about 40%, because the limitation of the laboratory rated device.