Improved Algorithms of Direct Torque Control Method

Sikorski, Andrzej; Korzeniewski, M.

doi:10.7305/automatika.54-2.173

Cited by 8 publications

(6 citation statements)

References 25 publications

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“…If the sampling interval is small enough (in our case 50 µs), some simplifications can be introduced; ω el can be considered to be quasi-constant and the stator currents change almost linearly (not exponentially) during the whole sampling interval. Therefore, voltage equations (3) and (4) can be discretized using the Euler approximation method, thus enabling the prediction of the stator current [8,10]:…”

Section: Predictive Sopf Detection Methodsmentioning

confidence: 99%

“…Along with the development of modern power electronics and microprocessor technology, more advanced control methods for electrical drives have been developed. Nowadays, two standard control strategies for PMSMs are mainly used, namely field-oriented control (FOC) and direct torque control (DTC) [3][4][5][6][7][8], which compete with predictive approaches [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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Single Open-phase Fault Detection with Fault-Tolerant Control of an Inverter-fed Permanent Magnet Synchronous Machine

et al. 2014

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In this paper first a current predictive method for single open-phase fault detection in a three phase drive with a permanent magnet synchronous machine is presented. The proposed method is based on a predictive stator current calculation. For each sampling interval the difference between the actual stator current and its predicted value in a previous sampling interval is calculated. To identify the location of a single open-phase fault, an identification method is presented which is based on the analysis of the stator current vector angle. After the single open-phase fault is detected and identified it is desirable for the electrical machine to continue operating with a reduced number of phases. For this purpose, a modified direct torque control algorithm for the fault-tolerant control is implemented. In order to improve the performance of the drive, a pre-firing angle is additionally introduced. All proposed methods have been simulated in Matlab/Simulink and verified on an experimental model. Detekcija odspojene faze i na kvarove otporno upravljanje pretvaračem napajanim sinkronim motorom s permanentnim magnetima. Učlanku je prvo predstavljena metoda za detekciju kvara odspojene faze u trofaznom elektromotornom pogonu sa sinkronim motorom s permanentim magnetima zasnovana na predikciji struja statora. U svakom koraku uzorkovanja računa se razlika izmeu trenutne mjerene struje statora i prediktirane vrijednosti iz prethodnog koraka. U svrhu odreivanja lokacije odspojene faze, predstavljena je metoda identifikacije zasnovana na analizi kuta vektora struje statora. Nakon otkrivene i utvrene odspojene faze, poželjno je nastaviti rad električnog stroja sa smanjenim brojem faza. U ovu svrhu implementiran je izmijenjeni algoritam izravnog upravljanja momentom za postizanje na kvarove otpornog upravljanja. Da bi se unaprijedilo vladanje sustava elektromotornog pogona, dodatno je uveden kut prethoenja aktivacije impulsa. Sve predložene metode simulirane su u Matlab/Simulink okruženju i provjerene na eksperimentalnom postavu.Ključne riječi: Sinkroni motor s permanentnim magnetima, na kvarove otporan sustav, kvar jedne odspojene faze, na kvarove otporno upravljanje, kut prethoenja aktivacije impulsa

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Section: Predictive Sopf Detection Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Single Open-phase Fault Detection with Fault-Tolerant Control of an Inverter-fed Permanent Magnet Synchronous Machine

et al. 2014

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“…Torque and flux control in Induction Motor (IM) drives is commonly achieved through the Field Oriented Control (FOC), which is based on decoupling of the torqueproducing and flux-producing components of stator current vector, or through the Direct Torque Control (DTC), which is based on a direct control of stator voltage without inner current control loop [1,2]. In IM drives torque and flux are coupled and they are controlled simultaneously by using fast current regulated inverters (in FOC drives), or by employing hysteresis controllers or decoupling circuits (in DTC drives).…”

Section: Introductionmentioning

confidence: 99%

Improved Torque Control of High Speed Shaft-Sensorless Induction Motor Drive

et al. 2015

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Original scientific paperThis paper presents improved torque control scheme for a high speed sensorless induction motor drive. The proposed high speed torque control scheme substitutes the flux oriented control by the voltage angle control in the flux weakening regime. This scheme uses maximum of available inverter voltage, alleviates well known problems of current control schemes in conditions with insufficient voltage margin and avoids the influence of estimated speed error to the achieved flux level. The algorithm uses similar slip control as flux oriented control algorithm, but is applied without an outer flux trajectory reference which is typical for the flux weakening, providing a fast and well damped torque response even if error in estimated speed is present.Experiments confirm the effectiveness of proposed torque control algorithm, smooth transition from the flux oriented control in the base speed region to the voltage angle control in the flux weakening, superior dynamic performance of the voltage angle torque control, and its robustness to an estimated rotor speed error. Key words: High Speed Induction Motor, Toque Control, Voltage Angle ControlUnaprijeeno upravljanje momentom visokobrzinskog pogona s asinkronim motorom bez mjerenja brzine. U radu je predstavljena unaprijeena shema upravljanja za pogon visokobrzinskog asinkronog motora bez mjerenja brzine. Predloženi postupak zamjenjuje vektorsko upravljanje upravljačkom strukturom s upravljanjem kutom napona u slabljenju polja. Predložena shema koristi maksimalni raspoloživi napon invertora, eliminira dobro poznate probleme strujno reguliranih pogona u uvjetima s nedovoljnom rezervom napona i eliminira utjecaj greške u estimaciji brzine na dostignutu razinu toka. Algoritam koristi sličnu kontrolu klizanja kao i vektorsko upravljanje, ali bez tipičnog vanjskog zadavanja toka u slabljenju polja, pružajući brz i dobro prigušen odziv momentǎ cak i u slučaju greške u estimaciji brzine.Eksperimenti izvedeni na velikoj brzini vrtnje potvruju učinkovitost predložene regulacije momenta, gladak prijelaz iz baznog područja brzine u slabljenje polja, vrhunske dinamičke performanse upravljanja kutom napona i robusnost na pogrešku u estimiranoj brzini vrtnje.

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“…Definite physical meaning of control signals and quick torque response are the remarkable assets for DTC. But torque ripple, current impulse, and massive online computations restrict its application [7]. VC is originated from the principle of flux orientation and enables controlling flux and torque to be decoupled like DC motor [8].…”

Section: Introductionmentioning

confidence: 99%

Adaptive Backstepping Based MTPA Sensorless Control of PM-Assisted SynRM with Fully Uncertain Parameters

Chang

Zheng

et al. 2018

Mathematical Problems in Engineering

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A nonlinear and robust adaptive backstepping based maximum torque per ampere speed sensorless control scheme with fully uncertain parameters is proposed for a permanent magnet-assisted synchronous reluctance motor. In the design of the controller, the relation to --axis currents constrained by maximum torque per ampere control is firstly derived. Then, a fully adaptive backstepping control method is employed to design control scenario and the stability of the proposed control scenario is proven through a proper Lyapunov function candidate. The derived controller guarantees tracking the reference signals of change asymptotically and has good robustness against the uncertainties of motor parameters and the perturbation of load torque. Moreover, in allusion to the strong nonlinearity of permanent magnet-assisted synchronous reluctance motor, an active flux based improved reduced-order Luenberger speed observer is presented to estimate the speed. Digital simulations testify the feasibility and applicability of the presented control scheme.

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Improved Algorithms of Direct Torque Control Method

Cited by 8 publications

References 25 publications

Single Open-phase Fault Detection with Fault-Tolerant Control of an Inverter-fed Permanent Magnet Synchronous Machine

Single Open-phase Fault Detection with Fault-Tolerant Control of an Inverter-fed Permanent Magnet Synchronous Machine

Improved Torque Control of High Speed Shaft-Sensorless Induction Motor Drive

Adaptive Backstepping Based MTPA Sensorless Control of PM-Assisted SynRM with Fully Uncertain Parameters

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