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Master of Science Thesis in Electric Power Engineering - page 32 / 114

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VOLTAGE ORIENTED CONTROL – SIMULATION

  • good accuracy current tracking,

  • less sensitive to parameter variations.

(Sources :[4] [9] ).

3.4.3 Design of the synchronous PI controller

Figure 3.7 : Synchronous coordinates schematic (see APPENDIX AA.5)

 Synchronous coordinates equation (notation,

)

(3.4)

And the system transfer function

is

1

(3.5)

Figure 3.8 : Current control with inner decoupling loop

 Cross coupling cancellation

The first step in the controller design is to cancel the cross coupling initiated by the term

(since multiplication by

maps the

axis on

axis and vice versa). This easily possible if we

have an accurate estimation of According to [9] , a PI current

which is controller

. has

no

satisfactory

tracing

performance

for

the

coupled

system described by equations (2.17)(2.18). For high performance and accuracy current tracking we

need to cancel this cross coupling. We select

as

(3.6)

with

the estimated value of . Then, if

and

we get

23

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