CONTROL ADJUSTMENTS IN FAST DECOUPLED LOAD FLOW

The fast decoupled load flow (FDLF) method has gained wide acceptance in the power industry owing to its simplicity and computational efficiency. The critical role of control adjustments designed to simulate the control strategies of system operation in load flow solutions has long been recognized. The implementation of standard adjustments, such as area interchange control, bus type switching, transformer-tap/phase-shift control, and switchable shunt control, may lead to oscillations, or even divergence of the FDLF solution. In this paper, this problem is circumvented by introducing a voltage angle or magnitude update solution after every set of adjustments. DC lines, multiterminal DC links and flexible AC transmission systems (FACTS) are also modelled as real power flow adjustments. Test results on several practical systems are presented to demonstrate the effectiveness of the developed FDLF method.