Operation of Parallel Inverters in Microgrid Using New Adaptive PI Controllers Based on Least Mean Fourth Technique

Figure 12

Root mean square (rms) and instantaneous voltage and instantaneous current waveforms during loss of inverter 1.

(a) Voltage profile at PCC during loss of inverter 2 by proposed controller

(b) Three-phase currents of inverter-1 during loss of inverter-1

(c) Three-phase currents of inverter-2 during loss of inverter-1

(d) Three-phase currents of inverter-3 during loss of inverter-1

(e) Voltage waveform Inverter-2 (or inverter-3) of one phase (phase A) before loss of inverter-1

(f) Voltage waveform Inverter-2 (or inverter-3) of one phase (phase A) after loss of inverter-1