Estimation of Load Impedance in a Power System

This paper describes a novel technique for measuring power system impedance back to source. The technique employs a power electronic converter which injects a voltage transient onto the network via an inductor. The resulting current is correlated with the disturbance voltage to determine the impedance. Simulation results indicate that this technique works effectively for various simple network topologies. As the technique employs controlled power electronic devices it may either be used as a stand alone piece of measurement equipment, or it may be embedded into the functions of an Active Shunt Filter for improved harmonic control.