Technical Lecture Session
DC-AC Inverter, Three-phase Inverter, Differential Inverter
This paper proposes a single-stage/three-phase DBFI combined with NSHC compensation strategy. The inverter injects 1.6 kW power to 200 V grid with low current THD, which matches the IEC61000-3-2 harmonic standards. The single-pole integrator in the secondary control-loop provides the main control-loop with a pole at the origin, which boosts the DC gain of the proposed inverter and improve the system accuracy. In addition, the compensation strategy decreases grid current THD from (25%) to (2.9%) and the input DC current ripples from 5.4 A(P.P) to 1.6 A(P.P).