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this paper compares two types of position calibration techniques: angle PI regulation and stochastic variance adjustment applied in three state-estimation observers and flux-linkage observer for sensorless control Permanent Magnet Synchronous Motor (PMSM). Three types of state-estimation observers are Extended Kalman Filter (EKF), Linear Kalman Filter (LKF) and Single Dimension Luenberger observer...
The intensive use of power converters and other non-linear loads in industry and by consumers in general, has produced an increasing deterioration of the power systems voltage waveforms. The presence of harmonic distortion in power lines results in greater power losses in the distribution systems, interference problem in communication systems and, sometimes, in operation failures of electronics equipments...
This paper describes an orthogonal arc-suppression coil, which has wider adjustable range, less harmonic and easier control. Regulation of the coil inductance adopts dynamical orthogonal coil magnetic control, and the respond of control is fast and accurate. Working distance from the resonance point, the orthogonal coil monitors the capacitive current of power net, and immediately turns into full...
The electric behavior of compact fluorescent lamps is analysed. In static conditions the lamp has a nonlinear voltage-current characteristic. In dynamic conditions the lamp has a dynamic conductance related to the static conductance by a differential equation. The lamp is simulated in two different circuits: one with a series reactor and another with a series reactor and a small capacitor in parallel...
The model of the interior permanent magnet synchronous machine (IPMSM) is transformed to a novel format, which can be treated as a surface permanent magnet synchronous machine (SPMSM). Based on the new form, novel methods for position estimation during standstill and low speed are presented for IPMSM drives. Carrier-signal-injection is used; persistent, rotating current vector is injected into the...
In an efficient process drive, the monitoring function is absolutely necessary because decision can be taken only based on correct and complete information about the parameters which characterize the process. An example of a process which requires such a monitoring is represented by the one associated to a electrical energy flow supervision system, which has the purpose of monitoring and storing the...
B-SIT has an advantage that its on-resistance is extremely low compared to those of other power semiconductor switching devices. Accordingly, we can suppress its conduction losses during large current operation. Then, high conversion efficiency is expected when B-SITs are utilized as the switching devices of high frequency inverters. Here, we adopt newly developed B-SITs which have the maximum ratings...
The paper proposes a new topology for multiple outputs DC supplies allowing for implementation of commercial low power AC/DC converters. A special attention is paid to supplying mixed analogue/digital circuits that give rise to permissive voltage deviations when discontinuous load currents are applied. To avoid this problem, the paper is particularly concerned with the back-end requirements of the...
In this paper a new snubber circuit design for three-level inverter will be presented. The so-called "dual snubber circuit" still comprises most of the positive features as a low number of components, improved efficiency due to the low snubber element and power semiconductor losses, reduced over-voltage across the semiconductor devices and no balancing problems. With these advantages, the...
The paper deals with a front-end topology of a low power switched-mode power supply intended for a plug and play use. During its design, a special attention has been paid to a simple and cost effective solution confronted with a wide input line-voltage range (57 ?? 3?? 240)??(1 ?? 0.2) VRMS and with the frequency range from 40 Hz to 65 Hz. Such extreme demands are particularly of interest in industrial...
The paper presents practical investigations of DC/DC multilevel, multicell converter with DSP/CPLD control. A flying capacitors topology, natural balancing process and method of control of three-cell DC/DC converter are presented. Practical realization of the controller with use of programmable logic, discrete regulators in signal processor, procedures of initial flying capacitors charging, protection...
This paper deals with the problem of robust speed control of electrical servodrives. A robust controller is developed using a nonlinear PI controller. The controller nonlinear characteristics is obtained due to fuzzy logic technique application. An original method of controller settings adjustment is presented. The use of this adjustment procedure ensures robust speed control against the variations...
The most commonly used methods for design of the industrial speed controllers are: experimental, root locus, frequency and optimization methods. The most commonly used experimental methods are Ziegler-Nichols methods: stability margin and step response function. Ziegler-Nichols methods are applied for design of speed controller of PM brushless DC motor drive. Both methods give the controller parameters,...
Tests of various types of inexpensive global positioning system (GPS) receivers were performed in order to asses the utility of the technique for archeo-geophysical surveying. It is demonstrated that under favorable conditions a 30 cm relative uncertainty of the kinematical positioning is achievable and that under conditions, where a degradation of the GPS fixes occurs during the scans, it is possible...
This paper presents a single-phase shunt active power filter for current harmonic compensation based on neural filtering. The shunt active filter, realized by a current controlled inverter, has been used to compensate a nonlinear current load by receiving its reference from a neural adaptive notch filter. This is a recursive notch filter for the fundamental grid frequency (50 Hz) and is based on the...
In the paper a model reference adaptive control speed control (MRAC) using on-line trained fuzzy neural network (FNN) was applied to the sensorless induction motor drive system. In this control method fuzzy-logic controller is equipped with additional option for online tuning its chosen parameters. In the paper PI-type fuzzy logic controller is used as the speed controller, in the field oriented control...
AC drive users with sophisticated applications are demanding greater reliability to avoid process interruptions. AC motor drive systems are susceptible to sensors failure. A novel fault tolerant field oriented control system for induction motors is introduced. The system maintains speed control in the event of sensors malfunction and adverse signal conditions, providing enhanced reliability. Different...
A permanent magnet (PM) motor is a primary motor of choice for small fan motor drive applications. A traditional fan drive based on a permanent magnet motor uses position feedback sensors such as Hall effect sensors. Recently PM motor drive with sinusoidal current and no position sensor has been demanded for many applications including air conditioner outdoor unit fan control. Some fan and pump applications...
In this work a fuzzy inference system is employed for the control of a PWM based direct torque control (DTC), driving an induction machine, to reduce ripple torque while limiting the current during start-up or when the stator flux magnitude changes. The proposed control scheme uses a fuzzy inference system to modulate the stator voltage vector applied to the induction motor, in magnitude and phase...
The paper presents a position sensorless vector control able to drive Interior Permanent Magnet Synchronous Motors in any operating conditions, including low and zero speed. According to the proposed approach a constant frequency sinusoidal signal (voltage or current) is injected in the machine along a given direction so that, thanks to the rotor saliency, a periodic stator signal component is generated...
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