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HARSFEN0602
where
α−
α−β
=
1
p , β−= 1q , i.e. q−= 1
β
,
p1
q
1
−
−=α .
Order Parameter Description Comment
1 p Float, represented by
2 long values
2 q Float, represented by
2 long values
15.4.1.3 Second order block (Block Type=15)
The basic continuous time second order element is filter
D
Cs
Es
BAsEs
B
D
2
2
++
++
⋅
Note that it can be used as a notch filter or as a low pass complex pole filter.
The equivalent discrete form is
22210
2
21
2
0
)1( azabbbz
bzbzb
+−−+++
++
Order Parameter Description Comment
1
1
k
210
bbb ++
Float, represented by
2 long values
2
2
k )(
21
bb +−
Float, represented by
2 long values
3
3
k
2
b−
Float, represented by
2 long values
4
4
k
2
a
Float, represented by
2 long values
210
kkb += ,
231
kkb −= ,
32
kb −= ,
42
ka = .
15.4.1.4 Scheduled Double lead block (Block type=22):
The basic continuous time double lead-lag element is
2
)k(bs
)k(as
)k(a
)k(b
+
+
⋅
.
The index k is the gain scheduler selector: it selects one set of (a,b) from the 63 possible selections
(a(1),b(1)) , (a(2),b(2))....(a(63),b(63)).
The frequency
)2/()k(a π [Hz] is the lead corner frequency. The frequency )2/()k(b π [Hz] is the lag corner
frequency.
The discrete equivalent form is
2
)k(-z
))k(-z(1
G(k))-(1 G(k)
β
β
+
Order Parameter Description Comment
1
β
(k) 0< )k(β <1
Floating point
2 G(k) 0<G(k)<1 Floating point
The DC gain of this block is unity.