Predictive torque control of open‐end winding induction motor drive fed with multilevel inversion using two two‐level inverters

IET Electric Power Applications

2020

Self Cite

The model predictive current control (MPCC) is popular and widely used method for permanent‐magnet synchronous motor (PMSM) and the tuning of weighting factor in classical cost function (CF) of MPCC of PMSM is not required. A three‐level inversion‐fed open‐end winding PMSM (OEW‐PMSM) would produce lesser torque and stator flux ripples; however, computation time required for the prediction of control variables is large. This study proposes a control method to three‐level inversion‐fed OEW‐PMSM for reduction of computational time without affecting the performance when compared with conventional MPCC. The proposed method uses a maximum four voltage vectors (VVs) instead of 19 VVs in three‐level conventional MPCC. The reduced VVs decrease the number of predictions and computational time for predictions. CF in terms of voltage is used, thereby eliminating the need to predict the currents and faster execution of algorithm is achieved. A higher sampling rate is possible to achieve using the proposed method; thereby, reducing the steady‐state ripples in developed torque and stator flux, and improving the percentage total harmonic distortion of stator current. The effectiveness of the presented control method is practically verified after comparing its computational time, steady‐state response and dynamic response with that of three‐level conventional MPCC.

Section: Introductionmentioning

confidence: 99%

Computationally efficient model predictive control of three‐level open‐end winding permanent‐magnet synchronous motor drive

Petkar

IET Electric Power Applications

2020

Self Cite

“…Elimination/reduction of CMV for open‐loop configuration of OEWIM configuration was reported [25–28]. DTC and PTC strategies to an OEWIM drive with two‐level and more than two‐level inversion schemes are reported [29–37]. DTC of OEWIM drive with two‐level inversion was reported [29].…”

Section: Introductionmentioning

confidence: 99%

“…In [32, 33], effective voltage switching state algorithms introduced to an OEWIM drive for three‐level and four‐level inversion, the modified look‐up tables utilises rotor speed. PTC of OEWIM drive with equal and unequal DC‐link voltages are reported in [34–37]. In [16, 34, 37], PTC of OEWIM has been introduced to reduce zero‐sequence currents and CMV, but these strategies utilises weighting factor for its operation.…”

Section: Introductionmentioning

confidence: 99%

“…PTC of OEWIM drive with equal and unequal DC‐link voltages are reported in [34–37]. In [16, 34, 37], PTC of OEWIM has been introduced to reduce zero‐sequence currents and CMV, but these strategies utilises weighting factor for its operation. In [34], PTC of OEWIM was introduced with two, three, and four‐level inversion schemes, but the PTC strategies used in this article uses modified cost function, predefined set of voltage space vectors based on rotor speed and complex tuning of weighting factors.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced direct torque control and predictive torque control strategies of an open‐End winding induction motor drive to eliminate common‐mode voltage and weighting factors

2019

IET Power Electronics

Direct torque control (DTC) and predictive torque control (PTC) strategies emerged as powerful tools for speed control of variable frequency drives (VFD). The limitations in classical DTC and PTC are: higher ripple in torque, flux, variable switching frequency, and higher common-mode voltage (CMV). High dv/dt and CMV results in shaft voltages, bearing currents, malfunction of power electronic devices and electromagnetic interference (EMI). To eliminate the CMVs and also to reduce the switching frequency, voltage vector selection-based DTC and PTC strategies are introduced to an open-end winding induction motor (OEWIM) drive. Another limitation of classical PTC is cumbersome tuning of weighting factors. To address this limitation, modified cost function-based PTC strategy has been developed to eliminate weighting factors. OEWIM drive operates with dual inverter configuration and the two inverters are operated with equal DC-link voltages; therefore, it delivers three-level output voltage. This article introduces various DTC and PTC strategies to an OEWIM drive to reduce torque, flux ripples, switching frequency, elimination of CMV, and weighting factors. The effectiveness of proposed DTC and PTC strategies is tested by dspace-1104 real-time interface controller and comparing the obtained results with classical DTC and PTC.

“…In [29, 30], two VSIs are energised with same magnitude of DC voltage, so [29] gives the DTC of OEWIM for two‐level inversion and [30] demonstrates SVM‐DTC of OEWIM. Predictive torque control of OEWIM drive with multi‐level inversion was introduced [31]. In [32], PTC of OEWIM was implemented with three‐level inversion and it uses limited number of switching states to reduce zero‐sequence currents, it increases torque ripple.…”

Section: Introductionmentioning

confidence: 99%

Improvised predictive torque control strategy for an open end winding induction motor drive fed with four‐level inversion using normalised weighted sum model

Meesala

2018

IET Power Electronics

Open end winding induction motor (OEWIM) drives are better alternate for multi-level inverter fed induction motor drives. OEWIM drives can be used in industries and electric vehicles but they entail ripple-free torque. Predictive torque control (PTC) strategy offers high dynamic performance and lesser ripple in torque, flux when compared with direct torque control. Classical PTC involves high switching frequencies and empirical methods to select weighting factors. The selection and tuning of weighting factors are cumbersome. In this article, a new normalised weighted sum model (WSM) based PTC of four-level inverter fed OEWIM is introduced to curtail torque, flux ripples, switching frequency and enhance the selection of weighting factors. The proposed algorithm uses multi-objective cost function and the optimisation of cost function is performed by using normalised WSM. The normalisation of individual cost function simplifies the selection of weighting factors to select optimal voltage vector. As a result, the proposed PTC offers all the features of classical PTC and overcomes the difficulties involved in classical PTC. Simulation and experimental studies are performed on dual inverter fed OEWIM with four-level inversion. The effectiveness of proposed algorithm is verified by comparing proposed PTC algorithm with classical PTC algorithm.