Model Predictive Control of a Two-Motor Drive With Five-Leg-Inverter Supply

Abstract

Model predictive control (MPC) for a two-motor drive, supplied from a five-leg inverter, is presented in this paper. As an alternative to existing methods, use of MPC in multimachine drives has the advantages of independent fast current control of the machines, elimination of the closed-loop system's cascaded structure, and a reduced number of microcontrollers. A vector control algorithm is required, necessitating state-space modeling, with each machine's direct-and quadrature-axis currents chosen as state variables. Prediction of future states is via a discrete-time model of the five-leg inverter and a piecewise-affine model of two permanent-magnet synchronous motors (PMSMs). A method which eliminates unfeasible switching states inherent in reduced-switch-count inverters while reducing computation and sampling times is proposed. The algorithm is implemented in a TMS320F28335 DSP microcontroller, which controls the five-leg inverter and the two PMSMs. Simulation and experimental results validate the presented control concept.Index Terms-Five-leg inverter, model predictive control (MPC), two-machine drive, vector control.

Power Peak Shaving With Data Transmission Delays for Thermal Management in Smart Buildings

“…The thermal control can be formulated as an MPC problem, which is widely used in process control applications [25], [26]. Considering the real-life operational environment, we adopt a networked MPC-based model in the system [27], [28], which can generate TCL operation sequences even with random delays.…”

Direct Torque Control of Five-leg Dual-PMSM Drive Systems for Fault-tolerant Purposes

“…So far, many control methods have been proposed for the five-leg dual-motor drive system and they can be classified into two types: pulse-width-modulation (PWM)-based and Manuscript received Aug. 25,2016; accepted Oct. 19,2016 Recommended for publication by Associate Editor Kwang-Woon Lee. † Corresponding Author: wangwei1986@seu.edu.cn Tel: +86-25-83794152, Fax: +86-25-83791696, Southeast University switch-based.…”

“…Considering the nonlinear tuning of conventional synchronous current regulators, the finite-control-set model predictive control (FCS-MPC) was designed for five-leg dual-motor drive systems [24], [25]. The computational burden is reduced by using a reduced set of voltage vectors, and multi-object control can be realized.…”

Comparison of Unmodulated Current Control Characteristics of Permanent Magnet Synchronous Motor

“…Some current controllers that have been implemented for PMSM are conventional nonlinear control (on-off, hysteresis, delta modulation) [4][5][6], PI control [7][8][9], internal model control [10,11], linear matrix inequality [12], resonant control [13], sliding mode control [14][15][16], predictive control [17][18][19][20][21][22], hybrid control [23], and intelligence control [24,25]. Furthermore, these controls can be categorized basically in two types: with modulation [7-15, 17-20, 22, 24, 25] and without modulation [4-6, 16, 19, 21, 23].…”

“…According to [23,25,26], PI control with PWM gives better steady state response while the modern control has better response during transient condition. However, [21] demonstrates that PI control with PWM could provide better response in steady state and transient conditions. This paper compares four unmodulated current control techniques for a PMSM including on-off control, sliding mode control, predictive control and hybrid control.…”