Showing papers on "Stationary Reference Frame published in 2017"
TL;DR: In this article, the second-order generalized integrator frequency-locked loop (SOGI-FLL) was introduced for realizing grid synchronization in the stationary reference frame, and the influences of the voltage perturbation on the estimated phase and further on the output current were revealed.
Abstract: The latest research has pointed out that the phase-locked loop (PLL) plays an important role in shaping the impedance of grid-connected converters, yet most of the works so far merely focus on the synchronous reference-frame PLL. Alternatively, this letter presents the impedance analysis of the second-order generalized integrator frequency-locked loop (SOGI-FLL), which has been introduced for realizing grid synchronization in the stationary reference frame. The influences of the voltage perturbation on the estimated phase and further on the output current are revealed for the grid-connected converter using the SOGI-FLL. The frequency-coupling effect of the SOGI-FLL is also identified and verified in the experimental tests.
78 citations
TL;DR: The dynamic reference design concept is extended to control single-phase grid-connected power converters, and the proposed control algorithm does not use instantaneous ac-power calculations; instead, it directly formulates the optimal control problem on the grid-current in the original stationary reference frame.
Abstract: In a conventional finite control set model predictive control (FCS-MPC) formulation, active and reactive power control loops rely on the predictive controller, whereas the dc-bus voltage is usually governed by a PI-based control loop. This originates from fact that the dynamic equations for describing the predictions of these variables are heavily coupled. In this paper, a cascade-free FCS-MPC for single-phase grid-connected power converters is presented. The proposed control algorithm is formulated in terms of established dynamic references design, which was originally proposed to directly govern active and reactive power, and dc-voltage in three-phase power converters. In this paper, the dynamic reference design concept is extended to control single-phase grid-connected power converters. The proposed control algorithm does not use instantaneous ac-power calculations; instead, it directly formulates the optimal control problem on the grid-current in the original stationary reference frame. The experimental results obtained with a single-phase grid-connected neutral point clamped (NPC) converter confirm a successful design, where system constraints, e.g., maximum power and weighted switching frequency, are easily taken into account.
68 citations
TL;DR: In this paper, a unified nonlinear optimization-based speed and position estimation algorithm for interior permanent magnet synchronous motor drives at wide speed range operations is proposed, where a cost function based on the voltage equations in the stationary reference frame is employed for speed estimation.
Abstract: This paper proposes a novel unified nonlinear optimization-based speed and position estimation algorithm for interior permanent magnet synchronous motor drives at wide speed range operations. A cost function based on the voltage equations in the stationary reference frame is employed for speed and position estimation. The speed and position can be estimated by minimizing the cost function. At low speed, including the standstill condition, the cost function is modified and high-frequency sinusoidal voltage signals are injected in the estimated magnetic axis. A phase locked loop is combined with the proposed position estimator for reducing the noise of estimation results. Compared with existing sensorless methods, a unified estimator is used at low- and high-speed operations and a better performance is obtained in transient and steady-state conditions. The convexity of the cost functions with respect to the speed and position estimation errors is analyzed in the paper. The feasibility of the proposed estimation algorithm is validated with an experimental test bench.
62 citations
TL;DR: In this paper, the authors proposed a simplified MP-DTC method without weighting factors for PMSG-based wind power system, where the torque and stator flux magnitude are predicted on the stationary reference frame instead of on the synchronous rotating reference frame, hence reducing the calculation amount.
Abstract: Conventional model predictive direct torque control (MP-DTC) of permanent magnet synchronous generator (PMSG) suffers from weighing factor tuning work and relatively large calculation amount. This study proposes a simplified MP-DTC method without weighting factors for PMSG-based wind power system. First, the torque and stator flux magnitude are predicted on the stationary reference frame instead of on the synchronous rotating reference frame, hence reducing the calculation amount. Second, a new cost function based on the torque and the reactive torque is developed in this study. As the torque and the reactive torque have the same order of magnitude, the weighting factor which is needed in the conventional MP-DTC system is eliminated. Meanwhile, the stator current and stator flux magnitude can be controlled indirectly by controlling the torque and reactive torque simultaneously, which ensures the stability of the system. Besides, the robustness of the proposed strategy to unknown PMSG parameter variations is improved to a certain extent. The experimental results validate the effectiveness of the proposed method.
44 citations
TL;DR: In order to inject the reference harmonic currents to the motor windings, an Adaptive Input-Output Feedback Linearization (AIOFBL) control is proposed, which generates the reference voltages for three phases voltage source inverter in stationary reference frame.
Abstract: Torque ripple reduction of Brushless DC Motors (BLDCs) is an interesting subject in variable speed AC drives In this paper at first, a mathematical expression for torque ripple harmonics is obtained Then for a non-ideal BLDC motor with known harmonic contents of back-EMF, calculation of desired reference current amplitudes, which are required to eliminate some selected harmonics of torque ripple, are reviewed In order to inject the reference harmonic currents to the motor windings, an Adaptive Input-Output Feedback Linearization (AIOFBL) control is proposed, which generates the reference voltages for three phases voltage source inverter in stationary reference frame Experimental results are presented to show the capability and validity of the proposed control method and are compared with the vector control in Multi-Reference Frame (MRF) and Pseudo-Vector Control (P-VC) method results
36 citations
TL;DR: In this article, Park transformation-based three-phase phase-locked loop technique is used to synchronize DG system sources to utility grid, which is one of the most common methods in the literature.
Abstract: Grid-tied distributed generation (DG) system-based renewable energy sources such as wind, sun and hydrogen have recently gained a large attention due mainly to environmental issues. In this study, to provide energy for various loads, it is connected to the common direct current bus system after DG system-based fuel cell and solar cell are modeled and simulated. In order to synchronize DG system sources to utility grid, park transformation-based three-phase phase-locked loop technique is used, which is one of the most common methods in the literature. Power control method-based synchronous reference frame with proportional integral controller or stationary reference frame with proportional resonant current controller is used in the DG systems. The performances of two controllers are discussed in this study. Simulation results are obtained for various scenarios at the designed and created simulation model of DG + Grid + Load system. The system is modeled and simulated by using PSCAD/EMTDC software package.
29 citations
TL;DR: The proposed IB-MG FRT could realize the fault current management (FCM) ability – instead of using a fault current limiter – to maintain the short circuit current level in a dense-load network during network faults or disturbances.
21 citations
TL;DR: In this paper, the authors proposed a novel scheme for fast power control of the doubly-fed reluctance generator with a low-cost partially-rated converter, a promising brushless candidate for limited speed ranges of wind turbines.
17 citations
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TL;DR: In this article, it was shown that two simultaneous events in one reference frame should be simultaneous in another reference frame if both stopwatches were restarted at the same time in a stationary reference frame.
Abstract: Two identical stopwatches moving at the same speed will elapse the same time after moving the same distance. If both stopwatches were started at the same time, there will be no time difference between these two stopwatches after both stopwatches have elapsed the same time. Both stopwatches will continue to show no time difference under identical acceleration. Therefore, both stopwatches show identical time in an accelerating reference frame if both stopwatches were restarted at the same time in a stationary reference frame. Consequently, a physical system that exhibits Translational Symmetry in its motion demonstrates that two simultaneous events in one reference frame should be simultaneous in another reference frame.
17 citations
TL;DR: A Backward/Forward Sweep (BFS) algorithm for power flow calculations adapted to matrix formulation in the αβ 0 reference frame is presented and is described as an efficient, robust and fast solver.
15 citations
TL;DR: In this paper, a quasi-proportional+multi-resonant (P+MR) control-based voltage controller was proposed to synchronize the inverter with the phase of the grid before the transfer from islanded to grid-connected mode.
Abstract: This paper proposes the grid synchronization method of inverter using a quasi Proportional+Multi Resonant (P+MR) control-based voltage controller a stationary reference frame. The inverter supplies a non-linear load under the islanded mode. In islanded mode, the inverter is defined as a voltage source to supply the full local load demand without a connection to the grid. On the other hand, if the grid is restored from a previous fault or the strategic islanding is unnecessary, the inverter needs to be synchronized with the phase of the grid before the transfer from islanded mode to grid-connected mode. When the system is modeled and controlled based on the stationary reference frame control, the AC reference voltage, which has a constant voltage and frequency in islanded mode, is substituted to the AC grid voltage. Significant error can occur due to the large phase differences between the phase of reference and that of the measured value. This error also can cause severe voltage dynamic problems. In addition, if any nonlinear local load is connected to the output of the inverter, it becomes more serious due to the harmonics generated from the loads. In this paper, the PR control under a stationary reference frame is used for voltage control under islanded mode considering the harmonic effects from the nonlinear load. The seamless grid synchronization method based on this PR control is proposed to solve the aforementioned problems. The validity of the proposed seamless grid synchronization method is verified through PSiM simulations and experimental results.
01 Sep 2017
TL;DR: In this article, a sensorless controller for synchronous reluctance motors based on finite elements model results is proposed, which includes an adaptive observer for not-zero speed operation and signal injection for standstill.
Abstract: This paper concerns the development of a sensorless controller for synchronous reluctance motors based on finite elements model results. A hybrid solution is used, which includes an adaptive observer for not-zero speed operation and signal injection for standstill. The observer detects the flux linkages components in the two-phase stationary reference frame by the voltage model integration and closed loop correction feedback. This last is provided by a non-linear model of the rotor-fixed frame flux components achieved by finite elements computations. The rotor speed and position are identified by a phase-locked-loop algorithm. To improve the observer performance, the mechanical model is considered, which accounts for the finite elements mapping of the motor torque. The study is applied to a prototype of synchronous reluctance motor with flux barriers rotor, designed to have the same stator core of a commercial three-phase 3kW induction motor. Both realistic simulations (accounting for the non-linear machine behavior) and experimental test are presented, showing the performance of the proposed solution.
TL;DR: In this paper, two current control strategies for 3-phase grid-connected inverters are analyzed: first, the well-known d-q control in the rotating synchronous reference frame ( d- q axes) using Proportional Integral regulators is described, and secondly, theproportional resonance controller in the Stationary Reference Frame ( αβ axes).
01 Oct 2017
TL;DR: The obtained results have demonstrated that the proposed SOGI-FLL scheme can estimate the expected parameters with excellent filtering capabilities and faster response time.
Abstract: For the proper and stable operation of a microgrid, an accurate estimation of the key parameters under various disturbances is the most important task for the rest of the control blocks. In this paper, a SOGI-FLL scheme aimed for voltage and current parameters estimation in single-phase power system is implemented using high speed ARM microcontroller. The main contribution in this work is the ability of the proposed SOGI-FLL scheme to estimate, with high precision, the stationary reference frame αβ components of the load voltage and current at the fundamental frequency. The active and reactive powers are calculated using the extracted components, which can improve their accuracy and speed. Practical evaluation is presented as case studies in order to test the effectiveness of the SOGI-FLL under various load conditions such as load change, amplitude jump and frequency variation. The obtained results have demonstrated that the proposed SOGI-FLL scheme can estimate the expected parameters with excellent filtering capabilities and faster response time.
01 Oct 2017
TL;DR: In this paper, a pseudo-sensorless driver with linear hall sensors that conduct the function of position sensor by measuring the edge-field of permanent magnets is proposed for the control of electric motors.
Abstract: For the control of electric motors, conventional inverters have utilized position and current sensors, but they undesirable in terms of cost and maintenance effort. For this reason, approaches without the sensors are developed by applying back electromotive force or signal injection-based method which also has some problems related to the the deterioration of control performance in low speed range or cross-saturation and secondary saliency, respectively. To overcome the above-mentioned problems, this study proposes a pseudo-sensorless driver with linear hall sensors that conduct the function of position sensor by measuring the edge-field of permanent magnets. The harmonic components of measured signals are eliminated by adaptive notch filter and phase-locked loop for obtaining accurate rotor position, and then the signals are again synchronized with the fundamental wave of current in stationary reference frame which is used for vector control. The outstanding features of proposed method are simplicity and proper controllability in wide speed range at minimal cost.
TL;DR: In this article, a control strategy of frequency self-adaptation without phase-locked loop (PLL) under αβ stationary reference frame (αβ-SRF) for a VSC-HVDC system is presented to improve the operational performance of the system under severe harmonic distortion conditions.
Abstract: A control strategy of frequency self-adaptation without phase-locked loop (PLL) under αβ stationary reference frame (αβ-SRF) for a VSC-HVDC system is presented to improve the operational performance of the system under severe harmonic distortion conditions. The control strategy helps to eliminate the cross-coupling under dq synchronous reference frame (dq-SRF), and is achieved through two key technologies: 1) positive phase sequence (PPS) and negative phase sequence (NPS) fundamental components are extracted from the AC grid voltage with an improved multiple complex coefficient filter (IMCF), and 2) grid instantaneous frequency is rapidly and precisely tracked using a frequency self-adaptation tracking algorithm (FATA) without PLL. The proposed strategy is applied to a point-to-point VSCHVDC system and validated by means of simulations. The results are compared to those with the traditional vector control strategy under dq-SRF. Simulation results illustrate that the proposed strategy results in better system performance than that with the traditional strategy in terms of harmonic suppression under normal and severe operating conditions of the AC system.
TL;DR: In this paper, a steady-state stability analysis of PV generator interfaced to grid via DC-DC buck-boost converter, 48-pulse DC-AC sinusoidal voltage source Inverter (VSI), LC filter and transmission line is presented.
Abstract: This paper presents detailed steady-state stability analysis of PV generator interfaced to grid via DC–DC buck–boost converter, 48-pulse DC–AC sinusoidal Voltage Source Inverter (VSI), LC filter and transmission line. The main purpose of the DC–DC converter implementation is to inject the voltage corresponding to the Maximum Power Point of the PV generator. 48-pulse VSI is chosen as the harmonic contents in the output voltage are far away from the fundamental frequency with very small magnitudes. For numerical simulations, the complete nonlinear dynamical mathematical model in dq stationary reference frame is used including that of the terminal characteristics of the PV generator. The study comprises eigenvalues of the linearized model at various solar intensities. The robustness of the system operating point is checked by time domain simulations after small perturbations in the gird voltage and step changes on the solar insolations. Historically, series compensation of transmission lines has been...
TL;DR: In this article, a hybrid exploration state for finite control set-model predictive control is proposed to reduce the line current ripple at a given average switching frequency, which is based on the calculation of the stator flux ripple in the stationary reference frame during the sampling time.
Abstract: This research tends to provide a novel exploration state for finite control set-model predictive control The aim of this study is to reduce the line current ripple at a given average switching frequency The proposed method with hybrid exploration state divides the space vector plane into two regions Each conventional exploration state is applied to a region, which would result in a lower root mean square current ripple The above-mentioned procedure is based on the calculation of the stator flux ripple in the stationary reference frame during the sampling time Consequently, a simple expression based on the magnitude and the phase angle of the reference voltage vector will be obtained, which can be employed as a measure for the current ripple The superior performance of the proposed method over the conventional exploration state methods is verified by the theoretical results and the experimental tests
TL;DR: In this paper, a normalised space vector pulse width modulation (SVPWM) scheme was proposed for four-switch three-phase (FSTP) voltage source inverter by using already available stationary reference frame stator voltages without requiring complex trigonometric calculations.
Abstract: Sector determination for a normalised space vector pulse width modulation (SVPWM) scheme is proposed for four-switch three-phase (FSTP) voltage source inverter (VSI) by using already available stationary reference frame stator voltages without requiring complex trigonometric calculations. The proposed method has been simulated by using MATLAB/Simulink and implemented using a VSI with a TMS320F28335 floating-point digital signal processing. Simulation and experimental results show the feasibility and effectiveness of the proposed SVPWM algorithm for FSTP inverter.
TL;DR: The current control performance of IPMSMs using the proposed sinusoidal current tracking controller is evaluated through numerical simulation and experiments, and the effectiveness of the proposed stationary reference frame position sensorless control system with the stator flux control method is confirmed through experimental results.
Abstract: Generally, standard direct torque control (DTC) does not require fine current responses from the current controller because the torque and flux of a DTC-based drive are controlled by a closed-loop system without current loops. It is often difficult for the standard DTC to achieve the desired current regulation and fine harmonic current disturbance suppression performancew. In order to overcome these problems, this paper proposes a new stationary reference frame position sensorless control system based on stator flux linkage estimation, and a new sinusoidal current tracking controller. In this paper, the current control performance of IPMSMs using the proposed sinusoidal current tracking controller is evaluated through numerical simulation and experiments. Finally, using the proposed sinusoidal current tracking controller, the effectiveness of the proposed stationary reference frame position sensorless control system with the stator flux control method is confirmed through experimental results.
01 Oct 2017
TL;DR: The results endow that the proposed algorithm effectively regulates both the stator active and reactive powers satisfactorily with chattering attenuation and also ensure faster dynamic response due to its adaptive nature of the variable gains.
Abstract: This paper presents recently developed Variable Gain Super Twisting Algorithm (VGSTA) for Direct Power Control (DPC) of a grid connected Doubly-Fed Induction Generator (DFIG) system to regulate stator active and reactive power directly in stationary reference frame. Grid-connected DFIG system exhibit highly non-linear behaviour due to random wind fluctuations, uncertainties in machine parameters and variation in grid voltage and frequency due to power system dynamics. These uncertainties produces large ripple in drive train torque which may lead to damage of mechanical components and also causes flicker in weak grid. Second-order Sliding Mode (SOSM) control strategy has an essence of robustness for highly nonlinear system having uncertainties and external perturbation. The proposed control scheme is designed using Lyapunov function. The efficacy of the proposed algorithm is demonstrated by comprehensive simulations on 5 kW DFIG system for optimum wind power extraction under the step variations of wind speed and reactive power. The results endow that the proposed algorithm effectively regulates both the stator active and reactive powers satisfactorily with chattering attenuation and also ensure faster dynamic response due to its adaptive nature of the variable gains. The robustness of the proposed control scheme has also been proved during disturbances and model parameter variations. The results are compared with First-order Sliding Mode (FOSM)-DPC scheme to corroborate the superior performance of the proposed strategy.
TL;DR: In this paper, a voltage-sensorless control scheme for a grid connected inverter using a disturbance observer (DOB) is presented, where the grid voltages are estimated by DOB in the stationary reference frame using the current measurements and reference signals.
Abstract: A grid connected inverter usually requires voltage and current measurements to control the active and reactive powers as well as the inverter output currents. While voltage sensors are essential to obtain reliable information on the phase angle, these additional components certainly increase the production costs and complexity. In this paper, a voltage-sensorless control scheme for a grid connected inverter using a disturbance observer (DOB) is presented. The grid voltages are estimated by DOB in the stationary reference frame using the current measurements and reference signals. Even though the DOB estimates the grid voltages with reasonable accuracy in the presence of the uncertainty such as the unbalanced condition and harmonic distortion, the resultant waveform shows a phase lag depending on the estimation bandwidth. To overcome this limitation, a phase lead compensation is introduced. By using these techniques, the phase angle of grid voltages can be completely restored even if the phase angle of grid is initially unknown. The proposed scheme is simple and straightforward. In addition, it does not require any additional hardware. The feasibility of the proposed voltage-sensorless control scheme is demonstrated through simulations and experiments using 2 kVA prototype inverter.
TL;DR: In this paper, a current optimizing control (COC) method for brushless DC motor is proposed to minimize the commutation torque ripple, where trajectories of the three phase currents are planned by the given torque and the optimized result of the copper loss and motor torque equations.
Abstract: The properties of brushless DC motor (BLDCM) are similar to the fractional, slot-concentrated winding of permanent-magnet synchronous machines, and they fit well for electric vehicle application. However, BLDCM still suffers from the high commutation torque ripple in the case of the traditional square-wave current control (SWC) method, where the current vector rotates asynchronously with back-EMF. A current optimizing control (COC) method for BLDCM is proposed in the paper to minimize the commutation torque ripple. The trajectories of the three phase currents are planned by the given torque and the optimized result of the copper loss and motor torque equations. The properties of COC are analyzed and compared with that of SWC in the stationary reference frame. The results show that the way of making the current vector rotate synchronously with back-EMF (back-Electromotive Force) can minimize the modulus and velocity of the current vector in the commutation region, and reduce the torque ripple. Experimental tests obtained from an 82 W BLDCM are done to confirm the theoretical findings.
TL;DR: A new algorithm for harmonic detection and compensation based on synchronous reference frame (SRF) is proposed, in which a band-pass filter with center frequency of th harmonic is designed in fundamental frequency SRF to extract random harmonic current.
Abstract: Algorithms for harmonic detection and compensation are important guarantees for an active power filter (APF) to achieve the harmonic control function and directly determine the overall performance. Existing algorithms usually need a large amount of computation, and the compensation effect of specified order harmonic is also limited. DC side capacitor voltage at sudden change of load is affected by the algorithm as well. This paper proposes a new algorithm for harmonic detection and compensation based on synchronous reference frame (SRF), in which a band-pass filter with center frequency of th harmonic is designed in fundamental frequency SRF to extract random harmonic current with two different frequencies of ( )th harmonic in stationary reference frame. This new algorithm can rapidly detect any specified harmonic, and it can adjust the power factor to compensate reactive power. Meanwhile, it has few impacts on DC side capacitor voltage under complicated operating conditions such as sudden change of load. The correctness and effectiveness of this new algorithm are verified by simulation and experiment.
01 Jan 2017
TL;DR: During normal operation of a permanent magnet brushless direct current motor (PM BLDCM) drive some faulty modes can occur as a result of the failures of the position sensors and transistors of a voltage inverter supplying the motor.
Abstract: During normal operation of a permanent magnet brushless direct current motor (PM BLDCM) drive some faulty modes can occur as a result of the failures of the position sensors and transistors of a voltage inverter supplying the motor. In this chapter the impact of these faults on the PM BLDCM drive system has been presented. The waveforms and FFT spectra of the stator currents, hodographs of the stator current space vector in the stationary reference frame following transistor faults and waveforms of signals determining the actual position of the rotor have been analysed in the chapter. Simple diagnostic and localization methods to identify a faulty part of the drive system have been proposed. The post-fault control has been analysed as well, it enables the drive system to continue its operation despite the diagnosed faults, because additional hardware circuits are used. This chapter presents simulation results validated by experimental testes conducted in a laboratory set-up.
TL;DR: In this paper, a new dead time effect compensation algorithm using proportional resonant controller is also proposed to reduce the output current harmonics due to the dead time and nonlinear characteristics of the switching devices.
Abstract: This paper proposes the dead time effect compensation algorithm using proportional resonant controller in pulse width modulation inverter of motor drive. To avoid a short circuit in the dc link, the dead time of the switch device is surely required. However, the dead time effect causes the phase current distortions, torque pulsations, and degradations of control performance. To solve these problems, the output current including ripple components on the synchronous reference frame and stationary reference frame are analyzed in detail. As a results, the distorted synchronous d-and q-axis currents contain the 6th, 12th, and the higher harmonic components due to the influence of dead time effect. In this paper, a new dead time effect compensation algorithm using proportional resonant controller is also proposed to reduce the output current harmonics due to the dead time and nonlinear characteristics of the switching devices. The proposed compensation algorithm does not require any additional hardware and the offline experimental measurements. The experimental results are presented to demonstrate the effectiveness of the proposed dead time effect compensation algorithm.
01 Dec 2017
TL;DR: The hardware results shows that the proposed control scheme can inject balance current even when the grid voltage is unbalanced, and can inject balanced current into a unbalanced grid.
Abstract: In this paper, a noble control scheme of grid connected PV system is presented for injecting balanced current into a unbalanced grid. Current and voltage control scheme is implemented in synchronously rotating reference frame whereas the feed forward term is added in three phase stationary reference frame. The proposed scheme is extensively studied and simulated in MATLAB/Simulink. A 5KVA grid connected solar PV system is developed in the laboratory. The proposed control scheme is implemented in dSPACE 1104 controller board. The hardware results shows that the proposed control scheme can inject balance current even when the grid voltage is unbalanced. THD of the grid current is 2.4%.
TL;DR: In this article, a stationary reference frame control is proposed and executed based on fundamental positive and negative sequence component evaluation for electric potential source inverter and Modified Shunt Active Line Conditioner is employed as current conditioner.
TL;DR: In this paper, the authors presented an application of direct torque and flux control (DTFC) for a four-switch three-phase inverter (FSTPI)-fed synchronous reluctance motor (SynRM) in which the saturation and iron losses' effects are involved in the machine control modeling.
Abstract: This paper presents an application of direct torque and flux control (DTFC) for a four-switch three-phase inverter (FSTPI)-fed synchronous reluctance motor (SynRM) in which the saturation and iron losses' effects are involved in the machine control modeling. The DTFC switching technique for the SynRM fed by FSTPI in low-power and low-cost applications is implemented by imitating the six-switch three-phase inverter (SSTPI). By considering equal effective vectors depicted in SSTPI, the αβ stationary reference frame is represented by using six sectors. Similarly, the voltage space vector formation is constructed in FSTPI. Accordingly the SynRM performance under DTFC is precisely analyzed by considering the saturation and iron losses' effects. The DTFC behavior based on SSTPI- and FSTPI-fed SynRM is evaluated using Simulink benchmark. At different operating conditions, further simulation and experimental results of DTFC based on FSTPI dynamically confirm the effectiveness of the proposed control appli...
01 Aug 2017
TL;DR: In this article, an adaptive sliding-mode observer is proposed to update the rotor resistance in indirect field oriented controlled induction motor drives, which can work well at different rotor speeds, but also is robust to other parameters.
Abstract: An adaptive sliding-mode observer is proposed in this paper to update the rotor resistance in indirect field oriented controlled induction motor drives. Although the observer is implemented in stationary reference frame, the design and theory analysis are made in the rotor-field oriented reference frame. Through coordinate transformation, the essence of the sliding- mode manifold and the theory foundation of the observer are feasible to be exposed clearly. As shown through simulation and experiment, the proposed observer not only can work well at different rotor speeds, but also is robust to other parameters. By integrating this adaptive scheme into the vector controlled motor drives, the performance can be improved.