Control of PV Systems for Multi machine Power System Stability Improvement

In this project, the operating characteristics of these systems in steady-state or transient operation are different from those of synchronous machines, giving rise to issues related to power system stability. The vast majority of grid codes stipulate that fault ride-through operating requirements should be enabled during severe contingencies in the transmission network, prioritizing delivery of reactive power to the power system to support voltage stability. However, this control action may contribute to rapid collapse of the system voltage under adverse operating conditions, such as when the critical voltage in the power vs. voltage curve is near the reliable voltage operating bound. Supporting power system stability under these circumstances represents a new challenge for inverter control schemes. This paper adapts a recently published fault ride-through control scheme for PV inverters for use in a multi machine power system and shows that the scheme can successfully maintain transient and voltage stability even under adverse voltage operating conditions. The simulation results of this method can be evaluated by using Matlab/Simulink Software.

Keywords: Fault ride-through, grid code, multi machine power system, photovoltaic generation, transient stability, voltage stability.