  Uncertainty and variability of renewable energy sources present an imperative
technical challenge for Electrical Distribution Utilities. Power Quality
indices represent quality of energy delivered and reliability. In this work, a
control strategy design for real-time PQ management in active distribution
systems is presented. The present work addresses management of voltage
fluctuations induced by the variability in renewable generation. A zero energy
reserve approach to tackle fluctuations of renewable energy generators is
developed. The power consumption of flexible loads is modulated to reduce the
technical losses and peak load of the feeder in this reactive power control
strategy. A Volt VAR control strategy formulation, using the capability of
smart inverters to provide dynamic reactive power is presented. Unbalanced
power flow, different load profiles and flexible loads as virtual energy
storages are used to improve voltage profile and reduce technical losses while
maintaining system reliability. IEEE 13 bus distribution system is used for
control strategy design validation. Comparative results indicate reduction in
the system technical losses and the stress on automatic voltage regulators. The
ease of design of control strategy indicate potential real-life application.
