D-STATCOM Control for a 100 KW Solar Photovoltaic Grid-Connected System

This paper investigates on study of stability for a 100 kW Solar Photovoltaic (SPV) grid connected system using Distributed Static Compensator (D-STATCOM) control. The proposed D-STATCOM control works as compensating reactive power source, which decreases the voltage variation on distribution side of proposed system. In addition, an isolated DC-DC converter has been implemented in conjunction with three-phase DC-AC Voltage Source Converter (VSC) in double-stage grid connected system operating at unity power factor. Especially, an Integral Regulator (IR) type of Incremental Conductance (IC) Maximum Power Point Tracking (MPPT) technique has been implemented, which controls output voltage of SPV array and derives maximum power from SPV array under changing atmospheric circumstances. Furthermore, the proposed MPPT technique has been proven highly converging in tracking of maximum power, and maintains a constant DC link voltage by altering modulation index of converter. For the duration of the faulted conditions at grid side, the resulting balanced waveforms at Point of Common Coupling (PCC) have been obtained. Additionally, harmonic study carried demonstrates the role of D-STATCOM in the reduction of harmonics and DC offset at utility side providing a stable steady-state and transient response. In order to authorize the proposed system, the Matlab simulations have been performed to show the effectiveness of D-STATCOM control in proposed double- stage SPV grid connected system.