Power flow analysis with easy modelling of interline power flow controller

•Easy modelling of interline power flow controller (IPFC).•The IPFC is represented as series impedances with shunt injected currents.•The target of control for active and reactive power flow can be achieved.•The symmetry of the admittance and Jacobian matrices can still be kept.•The complexities of the computer program codes are reduced.

This paper proposes an easy modelling of interline power flow controller (IPFC) into Revised Newton Raphson current injection load flow method. In this model, the IPFC is represented as series impedances with shunt injected currents at its terminal buses. The target of control for active and reactive power flow can be achieved by calculating these currents as a function of the desired power flow and the buses voltage at the terminals of IPFC. In case of controlling the active power flow only, these currents are calculated with the same method. But the reactive power flow is released and calculated according to the system. The injected currents are updated and added into the original current mismatches vector of load flow algorithm. By using this model, the symmetry of the admittance and Jacobian matrices can still be kept and incorporating of IPFC becomes easy without changing the basic load flow computational program. Consequently, the complexities of the computer program codes are reduced. Numerical results based on the literature 5-bus, IEEE 57-bus and IEEE 118-bus systems are used to demonstrate the effectiveness and performance of the proposed IPFC model.