A new induction motor drive based on the flux vector acceleration method
TL;DR: In this paper, a novel control strategy for the induction motor drive, based on the field acceleration method, is presented, which guarantees a fast torque response, low torque ripple in the steady state, and drive operation with a constant switching frequency.
Abstract: A novel control strategy for the induction motor drive, based on the field acceleration method, is presented. The torque is controlled through variations of the stator flux angular velocity. The stator flux is controlled by using a feedforward control scheme, with the stator flux reference vector adjusted so as to obtain the fixed rotor flux amplitude. The applied controller assures a fast torque response, low torque ripple in the steady state, and drive operation with a constant switching frequency. The algorithm includes the improved stator and rotor flux estimation that guarantees the stable drive operation in all operating conditions, even at low speeds. The experimental tests verify the performance of the proposed algorithm, proving that good behavior of the drive is achieved in the transient and steady-state operating conditions.
Citations
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01 Jun 2009
TL;DR: In this paper, the authors proposed a design and tuning method for a complex gain controller based on the three-phase induction motor mathematical model complex transfer function to be used in the direct torque control at low speed.
Abstract: This paper proposes a design and tuning method for a complex gain controller, based on the three-phase induction motor mathematical model complex transfer function to be used in the direct torque control at low speed which is a problem so far. The design and tuning of the complex gain is done by using the closed loop system frequency-response function. Experimental results are presented to validate the controller and operation at low speed is also explored.
20 citations
TL;DR: In this paper, a resolution-level vector controller (RLVC) is proposed for three-phase induction motor (IM) drive systems. The RLVC is structured to adjust the output voltages of a threephase voltage-source wavelet-modulated inverter which is used to supply a 3-phase IM.
Abstract: This paper presents the development, implementation, and performances of a resolution-level vector controller (RLVC) for three-phase induction motor (IM) drive systems. The RLVC is structured to adjust the output voltages of a three-phase voltage-source wavelet-modulated inverter which is used to supply a three-phase IM. The objectives of the RLVC are established by controlling the quadrature axis component of the stator currents while maintaining a constant direct axis component of the stator currents. The complete IM drive system incorporating the RLVC is successfully implemented in real time for performance testing using a three-phase squirrel-cage IM. The performances of the proposed IM drive system are tested for sudden changes in load torque and command speed. Simulated and experimental performances demonstrate reliable, stable, fast, and accurate responses of the proposed controller under various operating conditions.
19 citations
Cites methods or result from "A new induction motor drive based o..."
...6 and 8 that the RLVC had small starting time, negligible overshoot and undershoot, and minor steady-state oscillations compared to the PI-based vector controller....
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...…the starting response of the proposed RLVC controller, the simulated 3φ IM drive system is started with a load of TL = 1 N · m using the conventional PI-based vector controller, which is implemented with a hysteresis-band current controlled (HBCC) 3φ VS inverter that uses a fixed current band....
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TL;DR: In this article, a novel algorithm for the induction motor torque control in field-weakening region is presented, which provides full DC-link disturbance rejection and offers the torque response time sufficient for most applications.
Abstract: This study presents a novel algorithm for the induction motor torque control in field-weakening region. The proposed method insures maximum DC bus utilisation and extends the torque–speed curve up to the system limits. Controller is based on the stator voltage angle control. It provides full DC-link disturbance rejection and offers the torque response time sufficient for most applications. The algorithm is simple, without neither the outer flux loop nor the inner current loop. Dynamic response is preserved over wide speed range by means of gain-scheduling. Simulations and experiments prove an ease of implementation and the robustness of the proposed solution. This study comprises analytical considerations, simulation results, a detailed description of implementation steps and extensive experimental results.
13 citations
TL;DR: An architecture that accomplishes the construction of the RVG without division or explicit intersection point calculations is proposed and a hardware-efficient scheme is presented whose computational complexity is O(k2log(n/k)).
Abstract: The reduced visibility graph (RVG) is an important structure for computation of shortest paths for mobile robots. An efficient bit representation is proposed to construct segments that are part of the RVG. Based on the bit representation, a hardware-efficient scheme is presented whose computational complexity is O(k2log(n/k)), where k is the number of objects and n is the total number of vertices. An architecture that accomplishes the construction of the RVG without division or explicit intersection point calculations is proposed. An efficient field-programmable gate array implementation using block random access memory on an XCV3200E device is presented
11 citations
TL;DR: A novel structure for sensorless induction motor drive is proposed based on flux vector acceleration torque control that combines direct torque control with speed estimation based on slip frequency evaluation.
Abstract: A novel structure for sensorless induction motor drive is proposed based on flux vector acceleration torque control. The proposed structure combines direct torque control with speed estimation based on slip frequency evaluation. A stable drive operation is enabled in a wide range of operating speeds, including at standstill
10 citations
Cites background or methods or result from "A new induction motor drive based o..."
...When compared to the existing DTC algorithms [7], the performance is improved by decreasing the drive sensitivity...
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...Also, the technique introduced in [7] enables an estimation of rotor speed by using the slip frequency evaluation [8], which makes the torque control technique [7] attractive for use in sensorless speed control drives....
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...Consequently, in this paper, a novel scheme for the sensorless speed control of IM is proposed based on the torque control technique [7]....
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...Also, the use of a flux angular velocity estimator is avoided, which results in decreasing drive sensitivity to measurement noise [7]....
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...The rotor speed is derived from estimates of slip frequency, while the speed regulation loop is implemented by using the torque drive based on [7]....
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References
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Book•
01 Jan 1995
4,110 citations
"A new induction motor drive based o..." refers methods in this paper
...The torque controller parameters and are determined experimentally by using the standard procedure proposed in [12]....
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TL;DR: In this article, the authors proposed a limit cycle control of both flux and torque using optimum PWM output voltage; a switching table is employed for selecting the optimum inverter output voltage vectors so as to attain as fast a torque response, as low an inverter switching frequency, and as low harmonic losses as possible.
Abstract: New quick-response and high-efficiency control of an induction motor, which is quite different from that of the field-oriented control is proposed. The most obvious differences between the two are as follows. 1) The proposed scheme is based on limit cycle control of both flux and torque using optimum PWM output voltage; a switching table is employed for selecting the optimum inverter output voltage vectors so as to attain as fast a torque response, as low an inverter switching frequency, and as low harmonic losses as possible. 2) The efficiency optimization in the steady-state operation is also considered; it can be achieved by controlling the amplitude of the flux in accordance with the torque command. To verify the feasibility of this scheme, experimentation, simulation, and comparison with field-oriented control are carried out. The results prove the excellent characteristics for torque response and efficiency, which confirm the validity of this control scheme.
3,316 citations
TL;DR: Direct self-control (DSC) as discussed by the authors is a simple method of signal processing that gives converter-fed three-phase machines an excellent dynamic performance, and it is sufficient to process the measured signals of the stator currents and the total flux linkages only.
Abstract: The new direct self-control (DSC) is a simple method of signal processing that gives converter-fed three-phase machines an excellent dynamic performance. To control the torque of, say, an induction motor, it is sufficient to process the measured signals of the stator currents and the total flux linkages only. In the basic version of DSC, the power semiconductors of a three-phase voltage source inverter are directly switched on and off via three Schmitt triggers, comparing the time integrals of line-to-line voltages to a reference value of desired flux, if the torque has not yet reached an upper-limit value of a two-limit torque control. Optimal performance of drive systems is accomplished in steady state as well as under transient conditions by combination of several two-limit controls. >
1,730 citations
"A new induction motor drive based o..." refers background in this paper
...The use of the basic DTC concept with hysteresis controller [1], [2] results in a very fast response unforeseen in conventional drives with a linear current controller in the minor loop....
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...The concept of direct torque control (DTC) [1], [2] improves the torque control performance and makes the elimination of local current controller possible....
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...These tests are of special interest, since the stability of the basic DTC strategies [1], [2] is undermined in these operating conditions....
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TL;DR: In this article, the performance of the two control schemes is evaluated in terms of torque and current ripple, and transient response to step variations of the torque command, where secondary effects introduced by hardware implementation are not present.
Abstract: Field-oriented control and direct torque control are becoming the industrial standards for induction motors torque control. This paper is aimed at giving a contribution for a detailed comparison between the two control techniques, emphasizing advantages and disadvantages. The performance of the two control schemes is evaluated in terms of torque and current ripple, and transient response to step variations of the torque command. The analysis has been carried out on the basis of the results obtained by numerical simulations, where secondary effects introduced by hardware implementation are not present.
1,030 citations
"A new induction motor drive based o..." refers background in this paper
...The torque chattering and switching frequency variations can be avoided by introducing induction-motor (IM) drives with a fixed switching frequency [3]–[7]....
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TL;DR: In this article, a dead time compensation method is presented that produces inverter output voltages equal to reference voltages, which can be carried out automatically by an inverter controller for initial setup without any extra hardware.
Abstract: In this paper, a novel dead time compensation method is presented that produces inverter output voltages equal to reference voltages. An experimental result is also presented to demonstrate the validity of the proposed method. It shows that the compensation of the dead time is possible up to a sub-microsecond range. Also, the reference voltage can be used as a feedback value, which is essential for sensorless vector control and flux estimation. The method is based on space vector pulsewidth modulation (PWM) strategy and it can be carried out automatically by an inverter controller for initial setup without any extra hardware.
455 citations
"A new induction motor drive based o..." refers methods in this paper
...Together with the calculation of , the stator flux controller includes the “dead-time” compensation achieved by using the algorithm proposed in [9]....
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...In addition, to avoid the irregular drive operation at low speeds, the VSI “dead-time” effect is compensated by using the algorithm proposed in [9]....
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