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The considered converter-fed permanent magnet motor could alternatively be operated in two basically different states - the vector control mode or alternatively the brushless dc also known as electronically commutated mode. Several quality aspects concerning the system performance have been comparatively investigated in practical as well as theoretical manner. Focus is thereby given to the numerical...
Attention is focused in this paper, on the Matsuipsilas position observer structure, which is based on the back emf estimation for a permanent magnet synchronous machine. This structure includes gains and filters that have to be tuned, in order to reach the best possible convergence. An optimized experimental tuning of these gains in different PMSM operating points at low speed is depicted. The optimal...
The optimal control of electrical drives with permanent magnet synchronous machines is presented. The optimization takes into account the energetic and the response time criteria. A comparison between time optimal control and minimum energy control for electrical drives is performed. Some simulation and experimental results are presented.
This paper presents the development of high fidelity real-time model of a permanent magnet synchronous motor (PMSM) drive, to be used in hardware-in-the-loop (HIL) application. The PMSM model is based on a finite-element analysis (FEA) method and implemented on an FPGA chip. The motor inductances and flux maps are computed from the JMAG-RT finite element analysis software. A 3-phase IGBT inverter...
Eddy current losses in rotor permanent magnets (PM) of synchronous machines with concentrated windings are calculated for sinusoidal stator currents. Three different calculation methods are compared in the Finite-Element environment: 1) analytical post processing of FE magneto-static data with multi-move and eddy currents calculated from vector potential, 2) direct FE magneto-static method, 3) time...
POL with peak current mode control has first-order response depending on the controller design, and the overshoot and undershoot donpsilat appear in transient response. This feature is the chief advantage of peak current mode control. However, there is no example of the design that employed this feature efficiently. This paper investigates the design consideration for first-order response of peak...
This paper presents a comparative study between two control strategies based on the sliding mode control theory applied to a switched DC-DC boost converter. A master-slave control structure is applied to the converter such that the inner control loop is a sliding mode current controller and the outer voltage controller is designed according to what follows. First a proportional-integral compensator...
Driven by the proliferation of implantable and self-powered electronic devices, low-voltage, low-power, high-efficiency DC-DC power converters are on high demands. This paper first reviews the state-of-the-arts charge pumps, with focus on power loss minimization, power stage architectures and control signaling. A new four-phase complimentary charge pump is then proposed. By employing the techniques...
We have already reported the novel digital control method ldquostatic model referencerdquo which is the improved smart digital reference of output voltage. However, prior attempts to improve the transient response have been inconclusive because this model depends on the steady-state analysis. This paper presents a new model control method of the switching dc-dc converter using both the static and...
This paper is aimed for presenting the analysis of ac-ac converters taken into account unbalanced conditions. Analytical expressions for the output voltage and currents are presented. The major aim of the followed strategy is to control the Parkpsilas vector of the output-voltage, and to control the phase between the input-voltage and the input-current. This allows: (a) to have balanced output-voltages...
In this paper a control strategy for an induction generator based stand-alone power system is examined. The tested system consists of a prime motor, an induction generator, a Voltage Source Inverter STATCOM and a variable load. The paper focus on dynamics performance and stability margin of the system under alternative control strategies. The regulation strategy is based on the control of dc and ac...
High-tech drive control needs high quality of electrical energy like safe, continuous voltage supply with the required current at constant rms values and at constant frequency, then pure sinusoid waveform of voltage. If the rated voltage impressed to the computers in control systems will be decreasing to its 75% the disturbance in their operation appears and at 50% they all will loose their ability...
The paper presents a three-phase parallel active power filter without filter current measurement. Only supply grid voltage sensors, filter capacitor voltage sensor and supply line current sensors are used to provide filterpsila proper operation, aiming to reduce reactive power and line current distortion, caused by a non-linear load. Due to filterpsilas inverter-like topology with known parameters...
In this paper a solution to current unbalance is proposed. A three-phase grid feeds a single-phase load that causes current unbalance. This is a typical situation for AC railway substations. By employing AC-Choppers it is possible to obtain a variable Steinmetz Circuit, and define a control law able to compensate a variable current unbalance. At this effect, a theoretical analysis of load unbalance...
The paper is focused on the analysis of the power quality at the common connection point of the electrical grid that supplies the trams in the city of Craiova, Romania. For one week there has been performed the measuring of the current and voltage harmonics and of the harmonic distortion factors (HDF). There has been noticed the distortion of the current far beyond the admitted limits and the broad...
Electrical drives consume with ca. 60 % the largest part of electrical energy in Germany. Until 2012 the generation of green house gas, caused by electrical drives, shall be reduced by 39 million tons p. a. within the EU. The here presented energy saving potentials and the possibilities for future improvements of drive efficiency show, that the above noted aims may be reached, if the described measures...
This paper proposes a stator flux oriented (SFO) control scheme of induction motors using variable-saturation regulators. The traditional SFO control scheme consists in the d-axis current component, torque, stator flux, and speed loops with four PI-type controllers. The proposed control scheme uses two regulators with variable-saturation in such a way that maximum dc-bus voltage utilization is reached...
Operating single phase fed motors across a wide range of speed and load single phase fed motors across a wide range of speed and load with high efficiency is of growing interest. The paper at hand presents an investigation into the efficiency of different low cost variable speed drive concepts (namely phase control, integral (half) cycle control and integral switched cycle control) based on capacitor...
This paper introduces direct torque control (DTC) for six-phase induction motors (SPIM) with common neutrals. The machine has six phase windings spatially shifted by 60 electrical degrees and connected to a single neutral. SPIM drive has 64 inverter switching stages which provide higher possibility in selecting space voltage vectors than three phase induction machines. We will show that, it is not...
In this paper, a rotor-flux-oriented control scheme for seven-phase induction motor drive, having the stator flux components instead of the stator current components as main control variables, is presented. As a consequence, a simple stator flux regulator can replace the conventional current regulators implemented in the synchronous reference frame. The proposed stator flux vector control (SFVC) scheme...
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