Improving the Compensation Capacity of Interline Dynamic Voltage Restorer

An interline dynamic voltage restorer (IDVR) is a novel c o m p e n s a t i o n piece of equipment for sag mitigation It is made of several dynamic voltage restorers (DVRs) with a common dc link, here each DVR is connected in series with a distribution feeder. In the sag period, active power is transferred from a feeder to other one and voltage sags with long durations can be mitigated. IDVR compensation capacity, still, depends on the load power factor, and a superior load power factor causes lower presentation of IDVR. To beat this limitation, a novel design is obtainable in this paper which facilitate sinking the load power factor under sag conditions and, so, the compensation capacity is enhanced. The proposed IDVR make use of two cascaded H-bridge multilevel converters to infuse ac voltage with lower total harmonic distortion and eliminates the necessity to low-frequency isolation transformers in one side. The validity of the planned configuration is verified by simulations in the MATLAB environment. The Proposed IDVR is applied to the 6.6kv and extension applied to the 11kv transmission lines then, observed that compensation capacity of IDVR is improved.