Optimization of photovoltaic power system: a comparative study

Protection and Control of Modern Power Systems

Table 3 Values of old and new range of membership functions

Membership functions	Input (Error)		Input (change in error)		Output (derivative of error)
Membership functions	Old values	New values	Old values	New values	Old values	New values
NB	[−Inf −0.032 −0.016 -0.008]	[−Inf −0.032 −0.001952 −0.0007866]	[−Inf −100 -80 -40]	[−Inf −100 −2.503 −0.8948]	[−Inf 0 0.1 0.3]	[−Inf 0 0 0]
NS	[−0.016 -0.008 0]	[−0.001952 −0.0007866 0]	[−80 -40 0]	[−2.503 −0.8948 0]	[0.1 0.3 0.5]	[0 0 0.5]
ZE	[−0.008 0 0.008]	[−0.0007866 0 0.0001318]	[−40 0 40]	[−0.8948 0 1.043]	[0.3 0.5 0.7]	[0 0.5 0.848]
PS	[0 0.008 0.016]	[0 0.0001318 0.000451]	[0 40 80]	[0 1.043 2.603]	[0.5 0.7 0.9]	[0.5 0.848 0.8499]
PB	[0.008 0.016 0.032 Inf]	[0.0001318 0.000451 0.032 Inf]	[40 80 100 Inf]	[1.043 2.603 100 Inf]	[0.7 0.9 1 Inf]	[0.848 0.8499 1 Inf]