Background: Solar photovoltaic (PV) power generating system at the distribution end is
emerged as the best solutions to meet the peak power demand during the day time. However, the
highly intermittent nature of solar PV system demands a robust control, which is capable of serving
a constant load demand even during solar intermittency.
Objective: This paper presents a three-phase single-stage grid interfaced solar PV system, which
includes PV array, perturb and observe based maximum power point tracking (MPPT) and synchronous
reference frame (SRF) based inverter control.
Method: The proposed three-phase voltage source inverter is controlled to match the DC bus voltage
drained from the MPPT controller with sensed DC-link voltage amplitude in order to extract
maximum power. The sudden change in irradiance and temperature causes oscillations in the DClink
voltage amplitude, which further influences the dynamics of the system. Therefore, feedforward
compensation (FFC) based control method is proposed to overcome the aforementioned
Result: The current FFC method improves the speed of reference current estimation and the response
of injected currents into the grid. As a consequence, rise time and settling time of the DClink
voltage are reduced considerably. The stability of the voltage control loop is also increased by
employing FFC based control method.
Conclusion: The FFC-SRF based control presented in this paper offers several features including
active power injection at the unity power factor (UPF), power quality conditioning and reactive
power compensation for local loads. Extensive MATLAB simulation results are presented for different
conditions to validate the robustness of the controller under changing environmental conditions