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AN3095 Datasheet(PDF) 40 Page - STMicroelectronics

Part # AN3095
Description  The STEVAL-ISV002V2 demonstration board is the same
PDF  55 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3095 Datasheet(HTML) 40 Page - STMicroelectronics

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STM32F103xx-based current control strategy for inverter grid connection
AN3095
40/55
Doc ID 16555 Rev 3
Figure 25.
Stationary reference frame and rotating reference frame
Where
Equation 56
Then the two components on the DQ reference frame are:
Equation 57
Therefore, if
θ=θe the two components are reduced:
Equation 58
In order to detect the grid-voltage angle, used to perform the transformation, a PLL structure
may be used. In Figure 25, the block diagram of the PLL implemented in this application is
shown.
Figure 26.
Implemented PLL structure
⎥
⎦
⎤
⎢
⎣
⎡
θ
θ
=
⎥
⎦
⎤
⎢
⎣
⎡
α
β
e
m
e
m
sin
V
cos
V
V
V
)
sin(
V
cos
sin
V
sin
cos
V
Vq
)
cos(
V
sen
sen
V
cos
cos
V
Vd
e
m
e
m
e
m
e
m
e
m
e
m
θ
−
θ
=
θ
θ
+
θ
θ
−
=
θ
−
θ
=
θ
θ
+
θ
θ
=
0
Vq
V
Vd
m
=
=



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