STPMC1 ST Microelectronics, STPMC1 Datasheet - Page 68

• Manufacturer Part Number: STPMC1
• Description: Programmable poly-phase energy calculator IC
• Manufacturer: ST Microelectronics

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Energy calculation algorithm
68/76
compensated stream of 16-bit voltage from the 2
25
24
Equation 39
Q
Equation 40
Q
In case of non Rogowski sensor, the corresponding products are:
Equation 41
Q
Equation 42
Q
Then a subtraction of Q
Equation 43
Q = (Q
This gives the same result for Q in case of non Rogowski sensor, substituting B and k
with C and k
Equation 44
Q = (Q
The artificial reactive power (ART = 1) of line is computed as follows.
The inter-phase voltage sigma-delta stream is computed from voltage stream from the 1
stage as follows:
Equation 45
The inter-phase voltage sigma-delta stream (
stage (
Equation 46
Q = v
or in case of non Rogowski sensor, the corresponding products are:
Equation 47
Q = v
v
v
v
1
2
1
2
) is multiplied by the 16-bit current stream from the 2
) yielding:
uR
uS
uT
= v
=
= v
=
= (v
= (v
= (v
uiic
diic
2
2
u
d
Equation 15
/ k
/ k
- Q
- Q
v
v
uT
uR
uS
v
v
ii
si
INT
INT
i
s
1 / 3 = AB k
1
1
1 / 30 = AC [sin
- v
= ABk
- v
- v
= ACk
S
) / 2 = (AB sin ) k
) / 2 = (AC sin ) = (Uk
v
v
:
uR
uS
di
uT
ui
v
v
) / 2
) / 2
) / 2
si
ii
INT
DIF
= ABk
= - ACk
or
k
sin ( t) cos ( t + ) = - ABk
Equation 24
INT
1
INT
INT
from Q
cos ( t) sin ( t + ) = AC [sin
DIF
[sin
cos ( t) sin ( t + ) = ABk
k
Doc ID 15728 Rev 1
INT
INT
+ sin (2
2
is performed:
+ sin (2
/ 2 = (Uk
) and the value of 1 / 3 are multiplied yielding:
sin ( t) cos ( t + ) = - AC [sin
D
Ik
S
sin ) / 2 = U
t + )] / 2
D
Ik
t + )] / 2
Equation 45
L
sin ) k
nd
INT
stage of filter (
RMS
[sin
nd
INT
INT
), the 16-bit current from the 2
stage (
I
RMS
/ 2 = U
+ sin (2
[sin
- sin (2
sin
Equation 15
RMS
Equation 17
+ sin (2
k
- sin (2
t + )] / 2
P
t + )] / 2
I
RMS
sin
t + )] / 2
or
or
t + )] / 2
Equation
k
Equation
P
STPMC1
L
k
nd
INT
st