Control Strategies for Dynamic Voltage Support During Faults Using PV Smart Inverter

  • Rafaella A. F. Santos Western Paraná State University, Foz do Iguaçu
  • R. Reginatto Center for Engineering and Exact Sciences, Western Paraná State University, Foz do Iguaçu, PR
Keywords: Photovoltaic (PV), Smart Inverters, Dynamic Voltage Support, LVRT, Volt-VAr, DC link Voltage, Fault


In recent years, the number and capacity of solar photovoltaic (PV) installations connected to the power system are growing at a rapid pace worldwide. Therefore, power quality issues related to voltage regulation and grid stability are becoming relevant problems for distribution networks and PV owners. To mitigate these impacts, interconnection standards have been amended to add smart features to solar PV inverters as “Smart Inverters”, such as Low Voltage Ride-Through (LVRT) and dynamic voltage support. This paper explores the Volt-VAr control as a dynamic voltage support during faults in smart inverters with LVRT capacity. Furthermore, this work also develops different strategies to deal with DC link voltage level and converter capacity limitation. The simulation results show the reactive power injected to the system, the behavior of the inverter terminal voltage, and the DC link voltage level for different current priority techniques.