Distributed co-control of interface inverters for harmonic-loss mitigation and power-sharing accuracy in micro-grids

The control strategy for interface inverters or grid-tied inverters to optimize power quality and power sharing in micro-grids with varying dynamics and load demand is a distinct issue. Intuitively, the control problem termed here as Co-Control (CoC) is to regulate and distribute the power flow at grid-micro-grid interface with the help of inverters so as to support system inertia at any time instant. A flexible and seamless inverter control paradigm with desired modulation and a degree of operability is the need of hour for next generation distributed power systems such as micro-grids. This paper presents a joint control strategy for interface inverters in micro-grids leveraging on subsystem controllers for accurate power sharing and harmonic filtering. Control loops are improvised for better power quality by potentially reducing the harmonic loss to make the system efficient, reliable and power dense. Simulation results and parametric analysis validate the usefulness and contribution of the proposed approach.