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A novel extended state observer (ESO)-based vector control (VC) strategy is developed for permanent magnet synchronous motor (PMSM) drive systems with only one phase current sensor. Generally, to achieve high precision control, two phase current sensors are indispensable for successful operation of the feedback control. In response to a phase current sensor fault, by use of technique of ESO, a new...
Induction motors are the most commonly used prime-movers in industrial applications. Many induction motors supplied by frequency converters are coupled with a physical angular rotor position/velocity sensor which makes the drive complex and require maintenance. This paper presents a sensorless control structure to avoid using a physical angular rotor position/velocity sensor. The proposed method estimates...
This paper presents a method to calculate the core losses in SiFe laminations under magnetizations with DC bias and harmonics. DC bias is usually generated by the ground return current of high voltage direct current (HVDC) system intrude into the windings of neutral-grounded transformers, which leads to increase of harmonics and core loss. For accurate calculation of core losses under DC bias, the...
The standard measurement method for soft magnetic materials can not measure the magnetic parameters in deep saturation. Using the measurement equipment for hard magnetic materials, which has strong excitation ability, the parameters in deep saturation can be measured, whereas the measurement error is very large. Based on the analysis of the error sources, this paper proposed a method to improve the...
The phenomenological model, examined in this paper, uses mechanically supported magnetic dipoles, which are arranged to a collective on a regular Cartesian grid. In a former work, the authors showed, that the model is capable to re-enact the basic dynamics of a measured hysteresis after a parameter optimization process. One of the main issues of the parameter optimization process is the mechanical...
Although a number of 800kV UHVDC (Ultra High Voltage Direct Current) transmission lines have been built, there is lack of general UHVDC electroscope equipment and relevant standards. Therefore, a non-contact electroscope based on MEMS (Micro-Electro-Mechanical System) is proposed in this paper. The reasonable measuring position of the electroscope is selected. The distribution of electric field of...
Sensorless and torque control of Switched Reluctance Motors (SRMs) is a well-researched field. Many techniques rely on the measurement of phase inductance and or flux-linkage which can be significantly affected by the mutual phase inductance. By measuring the mutual inductance over an electrical cycle or at particular locations, the accuracy of the sensorless and torque control techniques can be improved...
This paper proposes a novel technique to estimate online the inductances of a Permanent Magnet Synchronous Machine (PMSM) based on the measurement of the current derivatives excited by two active-voltage vectors and one zero-voltage vector within a PWM cycle. The d- and q-axes inductances of PMSMs are calculated during normal operation of the drive system. The influence of the magnetic saturation...
This paper presents a sensorless control method for IPMSMS drives over a wide speed range operation, including zero speed. The rotor position estimation of this method is based on relating the measured current derivative response which excited from fundamental PWM sequences to the incremental inductance. Compared to other saliency tracking sensorless control schemes, this method doesn't require additional...
The photovoltaic (PV) array is one of the main components of the PV system, and the accuracy of the PV array model is directly related to the validity of the simulation results. The parameters of the PV array may change with the operation conditions. Therefore, it is important to identify the parameters of the PV array model according to the measured data. In this paper, the conventional four-parameter...
Single phase grid connected converters in Photo-voltaic(PV) and Electric Vehicles(EV) are finding their application in reactive power support to grid. A power feedback is generally integrated in the control loop for this purpose. Fast and accurate calculation of active and reactive power of the converter is necessary for swift response of controller in regulating output power. This also prevents converter...
Insulation failure between the electrical sheets of electrical machines or transformers might occur due to the burrs formed during the cutting process. Together with welding seams or screws used to hold the stack together, the burrs provide a conducting path for eddy currents. In this paper, equivalent conductivities of the EI core with and without interlaminar contacts are determined using 3D finite...
In this paper, position sensorless control method of IPMSM applying three shunt sensing PWM inverter using predictive current for phase current reconstruction and EMF calculation is proposed. Considering the price and volume of the system, a motor drive system applied with shunt and sensorless has been recently studied. However, there is some area that cannot measure three phase current especially...
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