Abstract
Direct torque control and vector control are modern ways of controlling AC machines that allow an electric drive to achieve a very fast response. This paper deals with the method of direct torque control of an induction motor, which is called Direct Torque Control with Direct Calculation of Voltage Vector (DVC-DTC). The method is dependent on the setting of the coefficients referred to as k1 and k2, so the aim of this contribution is to show how their setting affects the behavior of a drive. A DSC-based implementation of this method has been developed using a modern control system with the TMS320F28335 digital signal controller from Texas Instruments. The first part of this paper includes a theoretical description of the method. The second part describes the courses of the most important quantities, which were measured for different settings of the weighting coefficients. The experimental results were obtained by measuring a real drive in laboratory conditions.
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Notes
- 1.
I.e.: g2 has the opposite direction to the direction of the rotation of the stator flux vector \( \Psi _{1}^{\text{S}} \).
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Acknowledgement
This paper was supported by the projects: Center for Intelligent Drives and Advanced Machine Control (CIDAM) project, Reg. No. TE02000103, funded by the Technology Agency of the Czech Republic and Project Reg. No. SP2018/162 funded by the Student Grant Competition of VSB – Technical University of Ostrava.
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Appendix – Meaning of Symbols
Appendix – Meaning of Symbols
Symbol | Unit | Description |
|---|---|---|
T ref | Nm | Torque reference |
T | Nm | Torque (calculated) |
i 1α | A | Stator current (phase a) |
u 1α | V | Stator voltage (phase a) |
Ψref | Wb | Reference of the modulus of stator flux vector (the same as \( \left| {\Psi {}_{1}^{\text{S}} } \right|_{\text{ref}} \)) |
Ψ1α | Wb | α-component of stator flux vector (calculated) |
Ψ1β | Wb | β-component of stator flux vector (calculated) |
f sa | Hz | Sampling frequency (frequency of control loop execution) |
f sw | Hz | Switching frequency |
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Baca, J., Kuchar, M., Palacky, P. (2020). Effect of Weighting Coefficients on Behavior of the DTC Method with Direct Calculation of Voltage Vector. In: Zelinka, I., Brandstetter, P., Trong Dao, T., Hoang Duy, V., Kim, S. (eds) AETA 2018 - Recent Advances in Electrical Engineering and Related Sciences: Theory and Application. AETA 2018. Lecture Notes in Electrical Engineering, vol 554. Springer, Cham. https://doi.org/10.1007/978-3-030-14907-9_66
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