Fault Ride-Through and Transient Stability Augmentation of Grid-Connected PV Station Using Virtual Synchronous Generator

Abstract

Due to the extensive integration of renewable
energy sources (RESs), i.e., photovoltaic (PV) system, the
future power system is developing into an inverter-based
system from a dominated alternator-based power system.
This massive penetration of inverter-based PV system
reduced the system inertia and damping characteristics of
the power grid, impacting the fault ride-through (FRT)
capability and causes frequency instability. Therefore,
this paper proposes a virtual synchronous generator
(VSG) control mechanism of PV system inverter to
augment FRT competency and frequency stability. The
proposed VSG control system mimics the behavior of
conventional power plants. To observe and evaluate the
proposed controller behavior, simulation analyses were
executed in the PSCAD/EMTDC software for both
proposed and conventional controllers. The simulation
results clearly indicate that the proposed VSG control
system has sufficient damping characteristics to ensure
FRT capability and frequency stability.