STABILIZATION OF HARMONIC INSTABILITY IN AC DISTRIBUTION POWER SYSTEM WITH ACTIVE DAMPING

This paper deals stabilizing method of the interaction problems among the interconnected power electronics based power devices in a power distribution system. Even if each of the inverters in the network is stable individually, the combined network stability cannot be assured unless holistic stability assessment is performed. The impedance based stability criterion is used to study the effect of the active damping on the system stability. A benchmark of a Cigré power distribution network is modeled under the impedance based stability criterion and validated using the PSCAD/EMTDC simulation. The result shows that not all inverters need to have active damping for stabilizing the network but some of inverters can effectively change the impedance of the network, thus overall network becomes stable.