Optimization Active and Reactive Power Flow for PV Connected to Grid System Using Newton Raphson Method

The application of solar power plants connected to the utility grid could be one solution in reducing the use of fossil fuels as primary energy power plants.Currently, the use of solar energy to supply electricity on the on-grid area is growing rapidly. This paper proposes a simple method to optimize the power delivery of photovoltaic (PV) system to the utility grid. Two variables, the inverter output voltage Vint and power angle δ, is determined from the roots of two simultaneous Eq., active and reactive power in order to find the maximum and minimum reactive power. Newton Raphson method used to solve the roots of the two Eq. simultaneously. The value of Vint corresponding to the root equation is done by adjusting the amplitude modulation of the inverter.Hence, the set δ is done by shifting the phase angle of the reference wave of the inverter. In this model, 10 PV modules type of ND T060M1 with a 60 Wp capacity are used. The simulation results using SIMULINK-MATLAB have a pretty good performance. The voltage at the PCC point has reached its stable value at 220 Volt. Simulation results have shown the maximum value of the active power system at 1000 W/m2 irradiation was 408 W, as the reactive power is needed only 11. 82 Var. The solar power can work in a power factor approaching unity with the application of the proposed method is suggested.