Power quality improvement of utility-distribution system using reduced-switch DSTATCOM in grid-tied solar-PV system based on modified SRF strategy

Abstract

Abstract This paper describes a three-phase VSC based 4-switch Grid-Tied Solar PV-DSTATCOM using Modified Synchronous Reference Frame (MSRF) Theory to achieve the Unity Power Factor (UPF) operation, Zero Voltage Regulation (ZVR) operation, perform harmonics compensation and compensation against load unbalancing. The DC-Link voltage is set stable and voltage balancing is done across the split-capacitors under all load-charge conditions. Coordinated design of DSTATCOM consists of integrated Grid-Tied Solar Photovoltaic (PV) array and a DC-to-DC boost converter circuit for improvement of Photovoltaic energy/power. Maximum Power Point Tracking (MPPT) is used to provide the fixed power which is trapped and transferred from the array to the boost converter. UPF operation and ZVR are not available together. So, models are designed separately to accomplish one of the objectives (UPF and ZVR) for linear, non-linear and unbalanced loads. Simulation models are first designed in MATLAB software and then in Real-Time using RT-LAB having MASTER and CONSOLE blocks for Computation and Communication. In building of the model, Real-Time Digital Simulator (OPAL-RT 4510) is used in which hardware synchronised models are embedded, and hardware real-time results are displayed on the synchronised four-channel oscilloscope RIGOL-MSO5204.