FUZZY GAIN SCHEDULING OF PID CONTROLLERS FOR PV FARMS TO IMPROVE THE TRANSIENT STABILITY OF POWER SYSTEMS

The broad multiplication of expansive photovoltaic farms in power systems crumbles both system inertia and synchronizing coupling. Under the event of extreme faults the power system transient stability may be endangered. By using the fast active power control ability of the PV inverter the transient stability can be improved. This paper proposes the new utilization of extensive PV farms equipped with a Fuzzy Gain Scheduling of PID (FGS - PID) controller fo r transient stabilization of multi machine power system. The FGS - PID controller is used to control the PV inverter so that the inverter output can be modulated to stabilize the transient power swing when the fault takes place. To enhance the performance th e control rules, membership functions, scale factors of FGS - PID controller are defined by a Bee Colony Optimization. Simulation study in a two area interconnected four machine system exhibits the stabilizing effect and robustness of the PV with FGS - PID con troller over the PV with maximum power point tracking (MPPT) technique, Zeigler - Nichols PID (ZN - PID) controller, under different operating conditions. In addition, without losing the fundamental function of power generation, the PV with FGS - PID can supply energy to the system equivalent to PV with MPPT, during stabilization.