A Fuzzy Logic Controller to Increase Fault Ride-Through Capability of Variable Speed Wind Turbines

Table 1

Rules of fuzzy controller.

No.	Error	Integral error	Reactive power	Reference reactive power	Active power modulator
1	NVB	~PS	NVB	NB	B
2	NVB	~PVB	~NVB	NVB	ZE
3	NVB	NVB	~NVB	NVB	VB
4	NB	NS	~NVB	NVB	M
5	NM	PM	~NVB	NM	ZE
6	NS	PS	~NS	NS	ZE
7	ZE	ZE	ZE	ZE	ZE
8	PS	PVB	~PS	PS	ZE
9	PVB	NVB	~PB	PB	ZE

~ Means NOT.