DSP-based time optimal current control for high dynamic IPM motor drives

Kim

2012 Twenty-Seventh Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

et al. 2012

In Permanent Magnet Synchronous Machine (PMSM) drives, linear region, which is inside the inscribed circle of the voltage hexagon in the voltage plane, is mainly used for the stable operation. To enhance torque capability under the limited input DC link voltage, the region outside the inscribed circle of the voltage hexagon, known as overmodulation region, can be exploited in the flux-weakening operation. However, the operation of drive system in the overmodulation region cannot be free from the degradation of speed control performance. This paper presents investigations on control issues in the overmodulation region and proposes an algorithm for improving the speed control performance in the overmodulation region. The effectiveness of the proposed method is verified by computer simulations and experiments.

Section: Voltage Feedback Methods For Improving Dynamicsmentioning

confidence: 99%

Improved speed control of Permanent Magnet Synchronous Machine at overmodulation region

Kim

2012 Twenty-Seventh Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

et al. 2012

“…These methods are described in the following, classifying into methods that improve the transient performance and methods that improve the steady-state performance, i.e., enable the operation in the overmodulation range. Time-optimal controllers (TOC) [3][4][5][6][7][8] reach the operating point in the shortest possible time and, therefore, improve the control dynamics to its maximum extent. During transients, the time-optimal stator voltages (input trajectories) in the statorfixed frame are constant, see [3,4].…”

Section: A State-of-the-art Techniquesmentioning

confidence: 99%

“…Time-optimal controllers (TOC) [3][4][5][6][7][8] reach the operating point in the shortest possible time and, therefore, improve the control dynamics to its maximum extent. During transients, the time-optimal stator voltages (input trajectories) in the statorfixed frame are constant, see [3,4]. In order to calculate the time-optimal stator voltage, a set of nonlinear equations, cf.…”

Section: A State-of-the-art Techniquesmentioning

confidence: 99%

“…In order to calculate the time-optimal stator voltage, a set of nonlinear equations, cf. (24), must be solved numerically during online operation [3,4,7]. Consequently, all control methods that do not calculate the time-optimal stator voltage during transients, e.g., PI-FOC [2], deadbeat direct torque and flux control (DB-DTFC) [9], direct torque control (DTC) [10], or (standard) model predictive controllers (MPC) [11][12][13][14], may not reach the operating point in the shortest possible time, resulting in time-suboptimal control performance.…”

Section: A State-of-the-art Techniquesmentioning

confidence: 99%

See 1 more Smart Citation

Time-Optimal Model Predictive Control of Permanent Magnet Synchronous Motors in the Whole Speed and Modulation Range Considering Current and Torque Constraints

Brosch¹,

Wallscheid²,

Böcker³

2023

Preprint

<p>Improving control dynamics and enabling maximum torque and power conversion for a given electrical drive are important target quantities of drive control algorithms. To utilize the electrical drive to its maximum extent during transient and steady-state operation, a time-optimal continuous-control-set model predictive flux control (CCS-MPFC) for permanent magnet synchronous motors (PMSM) is proposed. This scheme considers torque and current limits as softened state constraints in the CCS-MPFC’s optimization problem to prevent transient overcurrents as well as torque over- and undershoots during time-optimal operating point changes. Furthermore, the overmodulation range including six-step operation can be entered seamlessly to ensure maximum power conversion at high speeds. Fastest transients within the whole modulation range are enabled by a time-optimal harmonic reference generator (TO-HRG). Here, the flux reference of the CCS-MPFC is complemented with a harmonic content that enables operation in the overmodulation region. Further, the reference is pre-rotated during transient operation to attain time-optimal control performance. Extensive simulative as well as experimental investigations for linearly and nonlinearly magnetized PMSMs show that, compared to state-of-the-art methods, time-optimal control performance in the whole modulation range without transient overcurrents as well as torque over- and undershoots can be achieved by the proposed control method.</p>

IEEE Trans. Ind. Electron.

“…Reusability of parts of the implementation is questioned, as it is not easy to retrieve the algorithm sequences. In addition, digitally controlled systems with digital signal processors (DSPs) have been presented in many publications on drive-control technology [11], [12]. In [13], authors express the limitations of DSP in terms of velocity for modern control algorithms if cost is mandatory.…”

Section: Implementation Of Hybrid Control For Motor Drivesmentioning

confidence: 99%

Implementation of Hybrid Control for Motor Drives

Lin-Shi

Morel

Llor

et al. 2007

Abstract-This paper presents the implementation of a hybridcontrol strategy applied to a permanent-magnet synchronousmotor (PMSM) drive. Hybrid control is a general approach for control of a switching-based hybrid system (HS). This class of HS includes a continuous process controlled by a discrete controller with a finite number of states. In the case of ac motor drives, in contrast to conventional vector control like proportional-integral control or predictive control, where the inverter is not taken into account by the controller, hybrid control integrates the inverter model and considers the state of the inverter as a control variable. It allows to obtain faster torque dynamics than vector-control algorithms. The hybrid control algorithm requires both computing velocity for real-time implementation and code flexibility for management of low-performance functions and analog-digital interfaces. Codesign appears as a promising methodology for partitioning hybrid-control algorithm between software (flexible) and hardware (velocity) while taking care of overall time constrains. In this paper, the implementation of hybrid-control algorithm for a PMSM drive is performed through a codesign approach on an Excalibur board, embedding a CPU-core (Nios-2 by Altera) inside an APEX20KE200EFC484-2X field-programmable gate array. The partitioning of software and hardware parts is explained. Experimental results show the effectiveness of the implementation. Performances, advantages, and limitations are discussed.Index Terms-AC motor drives, control, dynamic hybrid system (HS), field-programmable gate array (FPGA), hardware-software codesign.