Control Strategy of Three-Phase Photovoltaic Inverter under Low-Voltage Ride-Through Condition

Figure 22

Active current and reactive current waveform when grid voltage dropped at a single phase. Note: 1: reactive current/A; 2: active current/A.

(a) Single axis control method

(b) Dual rotating coordinate controller

(c) Active damping compensation feedback control strategy

(d) PR controller