Dynamic control of torque in overmodulation and in the field weakening region

Tripathi, Anshuman; Khambadkone, A.M.; Panda, Sanjib Kumar

doi:10.1109/tpel.2006.876823

Cited by 76 publications

(56 citation statements)

References 24 publications

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“…The simulation results of a multi-mode controller [15], undertaken using an almost similar motor, is shown in Fig. 12.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…The DTC-SVM proposed in [13] requires complicated calculations and cannot work completely in the six-step mode [14]. In [15], a novel DTC-SVM with a fast torque response and the capability of six-step operation is proposed. However, in this scheme, as in other DTC-SVM methods, complicated calculations are essential and a fast digital processor is required [13].…”

Section: Introductionmentioning

confidence: 99%

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A Novel Seamless Direct Torque Control for Electric Drive Vehicles

Umeno¹,

Amano²,

Sugai³

2011

Journal of Power Electronics

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Electric drive vehicles (EDV) have received much attention recently because of their environmental and energy benefits. In an EDV, the motor drive system directly influences the performance of the propulsion system. However, the available DC voltage is limited, which limits the maximum speed of the motors. At high speeds, the inverter voltage increases if the square wave (SW) voltage (six-step operation) is used. Although conventional direct torque control (DTC) has several advantages, it cannot work in the six-step mode required in high-speed applications. In this paper, a single-mode seamless DTC for AC motors is proposed. In this scheme, the trajectory of the reference flux changes continuously between circular and hexagonal paths. Therefore, the armature voltage changes smoothly from a high-frequency switching pattern to a square wave pattern without torque discontinuity. In addition, because multi-mode controllers are not used, implementation is more straightforward. Simulation results show the voltage pattern changes smoothly when the motor speed changes, and consequently, torque control without torque discontinuity is possible in the field weakening area even with a six-step voltage pattern.

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“…The simulation results of a multi-mode controller [15], undertaken using an almost similar motor, is shown in Fig. 12.…”

Section: Simulation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Novel Seamless Direct Torque Control for Electric Drive Vehicles

Umeno¹,

Amano²,

Sugai³

2011

Journal of Power Electronics

View full text Add to dashboard Cite

show abstract

“…The most popular variation on the DTC of induction motor drives is one that is based on space vector modulation (SVM), which is normally referred to as DTC-SVM [10]- [16]. Continuous improvements utilizing this technique have gained much momentum in order to facilitate DTC to operate in overmodulation mode to fully utilize the available DC voltage.…”

Section: Introductionmentioning

confidence: 99%

“…For these reasons, many researchers had shown significant interest in developing methods for estimating the maximum possible reference voltage during torque dynamic [15]- [17]. For examples, [16] utilized predictive control of the stator flux error vector to estimate the reference voltage and [15] used dead-beat control with several complicated equations to generate the reference voltage in real-time. Among the various schemes proposed, only [16] and [18] can achieve fast torque dynamic control and maximum torque capability in the flux weakening region with six-step voltage operation.…”

Section: Introductionmentioning

confidence: 99%

“…For examples, [16] utilized predictive control of the stator flux error vector to estimate the reference voltage and [15] used dead-beat control with several complicated equations to generate the reference voltage in real-time. Among the various schemes proposed, only [16] and [18] can achieve fast torque dynamic control and maximum torque capability in the flux weakening region with six-step voltage operation. Unfortunately, all of the proposed methods [15]- [17] increases the complexity of the DTC control structure and deviates from the simple drive structure as originally proposed in [1].…”

Section: Introductionmentioning

confidence: 99%

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A Hybrid DTC-DSC Drive for High Performance Induction Motor Control

Jidin¹,

Idris²,

Yatim³

et al. 2011

Journal of Power Electronics

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This paper describes a hybrid induction motor drive system incorporating DTC-hysteresis and Direct Self Control (DSC) schemes to achieve excellent dynamic performance. The control scheme is switched from a circular to a hexagonal flux locus whenever a dynamic condition is encountered. On the other hand, when the motor operates under steady state conditions, a circular flux locus is used. Without major modifications to the simple structure of a basic DTC, hexagonal flux locus operation is established by modifying the flux error status, before it is fed to the look-up table. The feasibility of the proposed hybrid scheme to achieve excellent control performance is verified by experimental results.

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