Inner loop model predictive control and outer loop PI reference governor for PMSMs with input and state saturation for torque control
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In: Mathematics and Computers in Simulation, Vol. 228, 02.2025, p. 178-201.
Research output: Journal contributions › Journal articles › Research › peer-review
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TY - JOUR
T1 - Inner loop model predictive control and outer loop PI reference governor for PMSMs with input and state saturation for torque control
AU - Zwerger, Tanja
AU - Mercorelli, Paolo
N1 - Publisher Copyright: © 2024 The Author(s)
PY - 2025/2
Y1 - 2025/2
N2 - This contribution considers a torque control scheme consisting of model predictive control (MPC) in the inner control loop together with PI reference governor in the outer control loop and a decoupling feedforward control for an isotropic permanent magnet synchronous machine (PMSM). This innovative approach is known in literature as PI-MPC dual loop control. A particular emphasis is given to the control governor strategy which is the outer loop PI reference governor and allows to regulate the machine in the flux weakening region and is therefore only active for field weakening. In this context the analysis of the stability based on Lyapunov’ approach of the control loop in flux weakening region is shown. The desired currents represent the reference currents for the MPC, which forms the inner control loop. The MPC is adapted using an extended Kalman filter (EKF), which estimates inductance of the electrical system in dq coordinates by using a bivariate polynomial. Compared measurements with a hardware-in-the-loop (HIL) system show the effectiveness of the proposed control scheme with respect to a standard PI controller in inner loop (PI-PI scheme) in the presence of saturated inputs and state of a PMSM. The proposed MPC uses just an optimal, proportional control and thus avoids windup effects. Measurement results in the presence of input and state saturations show that MPC is working without overshoot in the currents which leads to less needed power in input.
AB - This contribution considers a torque control scheme consisting of model predictive control (MPC) in the inner control loop together with PI reference governor in the outer control loop and a decoupling feedforward control for an isotropic permanent magnet synchronous machine (PMSM). This innovative approach is known in literature as PI-MPC dual loop control. A particular emphasis is given to the control governor strategy which is the outer loop PI reference governor and allows to regulate the machine in the flux weakening region and is therefore only active for field weakening. In this context the analysis of the stability based on Lyapunov’ approach of the control loop in flux weakening region is shown. The desired currents represent the reference currents for the MPC, which forms the inner control loop. The MPC is adapted using an extended Kalman filter (EKF), which estimates inductance of the electrical system in dq coordinates by using a bivariate polynomial. Compared measurements with a hardware-in-the-loop (HIL) system show the effectiveness of the proposed control scheme with respect to a standard PI controller in inner loop (PI-PI scheme) in the presence of saturated inputs and state of a PMSM. The proposed MPC uses just an optimal, proportional control and thus avoids windup effects. Measurement results in the presence of input and state saturations show that MPC is working without overshoot in the currents which leads to less needed power in input.
KW - Decoupled system
KW - EKF
KW - PI-MPC
KW - PMSM
KW - Saturation
KW - Engineering
UR - http://www.scopus.com/inward/record.url?scp=85203145970&partnerID=8YFLogxK
U2 - 10.1016/j.matcom.2024.08.006
DO - 10.1016/j.matcom.2024.08.006
M3 - Journal articles
AN - SCOPUS:85203145970
VL - 228
SP - 178
EP - 201
JO - Mathematics and Computers in Simulation
JF - Mathematics and Computers in Simulation
SN - 0378-4754
ER -