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This paper presents a Model Reference Adaptive System (MRAS) applied to the sensorless control of a DFIG system. The performance of the MRAS is enhanced by introducing a voltage model bandpass filter approximation to compensate for drift. Control is performed by a rotor-side matrix converter and is limited to the most common speed range in wind systems. Moreover a detailed analysis of the effects...
This paper presents a new carrier signal based approach for motion sensorless control of electrically excited synchronous machines. In the case of permanent magnet synchronous machines sensorless control at standstill and low speed is mostly done by injecting a high-frequency voltage and evaluating the resulting current response. Hence, the stator is used as the transmitter and as the receiver of...
Frequency converters enable energy savings and sensorless operation monitoring in pump and fan systems. This is possible with model-based estimation methods that apply frequency converter estimates of the rotational speed and the shaft power. Since compressors produce air flow similarly as fans, the same estimation methods should be applicable, if the fluid density change can be detected and analyzed...
Due to the challenge for sensorless control of concentrated windings (CW) interior permanent magnet synchronous machines (IPMSMs), this paper presents the analysis of a novel stator IPMSM for sen-sorless control based on high-frequency rotating voltage signal injection method. The topology of the machine is introduced and the new IPMSM has the advantage of less space harmonics. The sensorless control...
This paper presents a direct, adaptive and parameter-free current control scheme for synchronous machines with excellent control quality and high dynamics. For magnetic anisotropic synchronous machines (Ld = Lq), it automatically allows easy identification of the rotor position angle in the whole speed range, making it particularly suitable for sensorless control.
The Fundamental PWM technique for saliency tracking based sensorless (encoderless) motor control uses current derivative measurements to calculate the rotor position. However parasitic impedances in the drive, motor and cabling cause high frequency oscillations in the current, when the inverter's IGBTs switch. This prevents the immediate measurement of the current derivative when a new voltage is...
The usage of magnetoresistive current sensors is increasing steadily in the field of power electronics. Sensors must not only be accurate and dynamic, but must also be compact and robust. An integrated SMT magneto-resistive current sensor as well as a 2 MHz bandwidth THT current sensor is introduced. Various future applications from the wide field of power electronics are shown that open up new possibilities...
This paper proposes a novel position sensorless control in the overmodulation range of an inverter for IPMSMs with magnetic non-linearity. This paper describes the simultaneous achievement of (1) position sensorless control, (2) robust maximum torque per ampere control in consideration of the magnetic non-linearity in an IPMSM, and (3) robust overmodulation drives of the inverter. First, this paper...
This paper presents encoderless model predictive control scheme with time-varying sliding mode observer for a complete wind turbine system. The wind turbine system consists of a back-to-back converter (AC/DC/AC) and a direct-drive permanent-magnet synchronous generator (PMSG). We give a complete model of the system and present encoderless fixed-frequency model predictive direct torque control of the...
An encoderless model predictive torque control (PTC) is proposed in this paper. By using the MRAS estimation method to PTC, the system becomes simpler and has the virtue of low cost due to the absence of PWM modulator and speed measurement components. In implementation, a compensated MRAS is considered because of the stator current measurement errors. The experimental results confirm that this control...
In this paper, Permanent Magnet Synchronous Motor(PMSM) position sensorless control system in the inverter overmodulation range has been proposed. Operating PMSM in the inverter overmodulation range achieves fast torque response and widens high-speed drive region of PMSM. In the range, however, because of the effect from harmonic currents, a closed loop current control system become unstable, further...
A new control method for a single-phase PFC rectifier consisting of interleaved sub-converters is proposed. Only one current sensor is used. No conventional voltage sensors are involved. The secondary coil of the inductor in one of the two step-up sub-converters is used for PFC control. The ac-side and dc-side voltage information required for the control is easily obtained from the induced voltage...
This work presents a sensorless torque control of permanent magnet synchronous machines (PMSM) in railway traction applications based on the flux estimation. In order to improve the algorithm performance in a wide speed range, some compensation loops are included. Special techniques for standstill and flying start are also proposed. The sensorless control strategy is validated in a railway simulation...
The paper presents results of a research on the sensorless drive with PMSM supplied through the sinusoidal filter. The back electromotive force based observer is used to the shaft position estimation. Used in the study, the observer's correction function, contains multi integrators in the path, which improves the position estimation. Otherwise than in a typical implementation of the position observer,...
This paper presents a sensorless and stable control method for a five-phase permanent magnet synchronous motor (PMSM). At first, a model of a five-phase PMSM is presented. After that a stability study has been performed by the analysis of the eigenvalues of the state transition matrix of the linearized PMSM model about an operating point. The results show that the machine speed response is unstable...
This paper proposes the fast initial position estimation of IPMSMs (Interior Permanent Magnet Synchronous Motors), based on intentional pulse voltage injection and comb filters. Generally, the rotor position can be estimated by detecting high-frequency current caused by injected high-frequency voltage because its response includes inductance information due to saliency. In general, sinusoidal current,...
This paper deals with the new encoderless control of a 9 phase permanent magnet synchronous generator used for a direct drive 6MW wind turbine. The particularity of the machine is the 3 stars windings that increase the availability of the system. The machine is supplied by 3 Low Voltage (LV) converters, one for each star. The control system insures the torque and the flux control by the sensorless...
This paper presents a new technique to estimate the rotor position for self-sensing magnetic bearings. The current slope, which is caused by the switching voltage of the PWM amplifier, is used to estimate the rotor position. One highlight of the proposed technique is to calculate the current slope from more than two samples of currents within one PWM cycle. Thus, using multiple sampling of coil currents...
For sensorless position detection of permanent magnet synchronous machines at very low speed and standstill, signal injection methods are commonly used. As a prerequisite these so called saliency-tracking methods require a differential magnetic anisotropy of the machine, which is both position and load dependent and thus varying during operation. So the performance of sensorless operation strongly...
This contribution investigates the influence of magnetic saturation on the sensorless control of IPM synchronous motors. An extended analytical motor model is introduced that covers magnetic anisotropies and describes the fundamental wave as well as the harmonic characteristics. Simulation results are compared to actual measurements on a servo drive.
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