Analysis and Verification of Compound SRFPI-LADRC Strategy for an Off-Grid Single-Phase Inverter

Table 3

Performances of the three methods.

Load type	SRFPI			LADRC			SRFPI-LADRC
	THD(%)	erms(V)	Vorms(V)	THD(%)	erms(V)	Vorms(V)	THD(%)	erms(V)	Vorms(V)
No load	1.60	1.65	110.52	2.20	13.40	111.74	0.87	1.38	110.52
Nominal resistive load	2.44	2.89	110.45	2.78	16.19	110.86	1.87	2.81	110.47
Highly nonlinear load	2.91	9.52	110.54	4.95	15.40	111.47	2.14	3.48	110.56
No load to rated load	Voltage restore time(ms)
	1.6			1.2			0.8