I have been using D-Q algorithm to control full bridge single phase inverter. following steps i followed to get control algorithm for single phase VSI.
following steps are
1.small signal modelling of inverter with LC filter.
2.orthogonal imaginary circuit was constructed.
3.park transformation and cross coupling .
4.PI compensator derived for inverter.
5.inverse park transformation.
6.finally control reference sinusoidal signal generating from sine function.
i have to follow all the steps for generating the sinusoidal reference signal to control my single phase full bridge inverter. but if i am applying the same control theory to multi level inverter i could not able to make small signal modelling like full bridge inverter since full Bridge inverter having four IGBTs/ Mosfet (s1,s2,s3&s4). In order to get output voltage across the load we used to switched ON the four IGBTs in complementary manner ,whice means when s1,s2 ON s3 & s4 off.From above the switching pattern we can get On time( D ) and Off time (1-D).so we can able to derive small signal model for inverter.But in multi level inverter INPUT VOLTAGE is varying quantity many switching time (for 5 level )also will encounter in order produce multiple level across the Load .how can i get switching time to derive small signal model for MLI ?
Dear ARIVAZHAGAN Pa,
I suggest for you a links and attached files in topics.
-Single-phase grid-tie inverter control using DQ transform for active and ...
https://www.researchgate.net/.../224213848_Single-phase_grid-tie...
-Vector Control of Single-Phase Voltage-Source Converters Based on ...
https://www.researchgate.net/.../224207532_Vector_Control_of_Si...
- 3 - IEEE Xplore - Conference Table of Contents
ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber...IS...
Best regards
For dq theory to apply you require a synchronously rotating reference frame. Well how will you make that with single phase system? I don't know.!
Dear Vipin pilanku,
we have to construct imaginary orthogonal circuit in order to make synchronously rotating frame.
- Badges
- Science topic
- Similar topics
- Engineering
- Control Theory