how i can make control for active power filter without any current measurements ?
if you are considering regulation of your filtering you need some inputs. The alternative of the current measurement is the voltage measurement.
Please look at the book
Microelectronics
by
Grabel
from
Northeastern University
in
Boston, MA
USA
You can do that by simply measuring the DC bus voltage of your inverter, than estimate the three current phases through the mathematical model of your VS inverter.
@ Sellali Mehdi
How the 3 phase currents haronics can be estimated from dc bus voltage?! The harmonics are injected by load and are independent from the plant model
Dear Sabir,
Is there is any problem with current measurement. The current measurement is substituted by current sensors which produce voltage. Such sensors are:
Current sensing or measuring resistance which is a very small resistance minimally disturbing the circuit. Then the voltage across this current sensing resistance is amplified using differential amplifiers and used as a control parameter.
The other method is to use Hall generators which senses the current without contacting.
There is also the current transformers.
Best wishes
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