Abstract:
This thesis presents the predictive current control technique for controlling the load current to reduce electricity consumption at the grid system. It was designed to control the inverter connected to solar cell in supplying the current into the grid system.
The six-switching control methodology for three-phase two-level inverter was designed and operated under the determined predictive current values. The algorithm model was created to compare the current values between the measured current and the previous reference current using the computer program which imitated the real situation in supplying current into the grid system. To test the simulation model, the reference current was specified as 5, 7, and 10 A, respectively, to control the current of the inverter in the solar cell system to rapidly supply the current into the grid.
The simulation results showed that the values of the reference current and the measured current were similar. The tracking phase angle was done while the grid was connected to the solar cell system. The phase lock loop circuit was also used to trace maximum power at the grid. Hence, the maximum power occurring at the grid depended on the current control of the inverter. As a result, the proposed system could compensate the maximum power demand which was 15.56 % of the load current when compared to the capability in supplying current of the grid power source.