Bus Voltage Stabilization Control of Photovoltaic DC Microgrid Based on Fuzzy-PI Dual-Mode Controller

Table 3

Comparison of performance indexes under different controlling strategies.

		PI controller	Fuzzy controller	Fuzzy-PI controller
Initial power-up	Adjustment time (s)	0.4	0.2	0.2
	Voltage overshoot (V)	2.5	0	0
	Steady-state error (V)	0	0.8	0
Load’s surge	Adjustment time (s)	0.8	0.2	0.2
	Voltage variation (V)	7.5	4.5	3.5
	Steady-state error (V)	0	1.2	0
Load’s sharp reduction	Adjustment time (s)	0.8	0.2	0.2
	Voltage variation (V)	1	0.5	0.3
	Steady-state error (V)	0	0.8	0