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Genetic Algorithm Embedded into a Quality-Oriented Workflow of Methods for the Development of a Linear Drive used in Intralogistic Systems

Wörner L., Kulig S., Willing M., Winzer P.

Archives of Electrical Engineering

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2014

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Vol. 63, nr 4

647--665

EN

This paper presents the results of the DFG-project (Deutsche Forschungsgemeinschaft) Q-ELF (“Qualitätsorientierter Methodenworkflow für die Produktneuentwicklung eines Linearantriebs in der Fördertechnik”) carried out in cooperation of the TU Dortmund University (support code KU 1307/12-1) with the BUW Wuppertal (support code WI 1234-11/1). The project continues the former project SFB 696 (Sonderforschungsbereich) regarding the Demand Compliant Design (DeCoDe) and the corresponding system model that strengthens the knowledge management to create high-quality mechatronical systems. In contrast to the SFB, which comprised the reverse engineering of a belt conveyor, Q-ELF applied a workflow of methods for quality oriented development on a new product. The DeCoDe ensures a methodical development that connects different engineering domains. This connection is important because the most problems and malfunctions arise at the interface of different domains due to their different notations for example. This approach also enables a methodical comparison of different competing concepts to pick the best suited one. A genetic algorithm is presented to further decrease the design-space. The project was carried out to develop linear drives for intralogistic systems.

2

Wybrane zagadnienia kompensacji mocy biernej w sieci dystrybucyjnej

Kulig S., Bąchorek W., Brożek J.

Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej

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2013

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Nr 36

127--130

PL

Przesył mocy biernej w sieci elektroenergetycznej jest niezbędny do funkcjonowania urządzeń zasilanych napięciem przemiennym jednak wpływa on niekorzystne na parametry jej pracy. Jednym ze sposobów ograniczenia tego wpływu jest instalacja urządzeń do kompensacji mocy biernej. Moc tych urządzeń ustalana jest najczęściej na podstawie obciążenia szczytowego sieci, tak aby spełnione zostały wymagania w zakresie dyrektywnego współczynnika mocy tg. Często moc takich źródeł mocy biernej jest stała, z zatem nie jest dostosowywana do zmian obciążenia sieci. W dolinie obciążenia przy braku tzw. kompensacji nadążnej może wystąpić problem przekompensowania co wpływa na poziomy napięć sieci zasilających. W artykule przedstawia się wybrane problemy kompensacji mocy biernej w sieci dystrybucyjnej. Przedstawiono przykłady i wyniki analiz ilustrujące wpływ sposobu kompensacji mocy biernej w sieci rozdzielczej na warunki pracy sieci elektroenergetycznej.

EN

In the paper, the selected problems of reactive power compensation in a distribution network are presented. Reactive power is indispensable for a proper functioning of alternating current devices. The negative influence of the transfer of reactive power on the working of an electric power system makes the electric power operators to reduce its consumption by determining the required value of the directive power factor in the consumer’s network. In order to meet the value of the directive factor, the consumers compensate the reactive power. If they decide to use the reactive power compensator for peak loads, it is likely that overcompensation will take place at low loads. In such cases, the load becomes a receiver of the reactive power. Such a load results in the increased voltage at the connection point even above the admissible levels. In the paper, the influence of the direction of change in the reactive power flow on the levels of voltage in an electric power system is analyzed.

3

Comparison of numerically determined noise of a 290 kW induction motor using FEM and measured acoustic radiation

Nahlaoui M. Al, Steins H., Kulig S., Exnowski S.

Archives of Electrical Engineering

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2013

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Vol. 62, nr 2

195--207

EN

In this paper a comparison of numerically determined and measured electromagnetically exited noise of an induction motor is presented. The calculations are accomplished using FEM for an example motor, which is a 290 kW inverter-fed asynchronous machine. The approach starts with the electromagnetic and mechanical consideration. The focus is set on acoustic considerations, which contain the 3D-FE-model and measurement setup in the sound chamber.

4

Applicability of Park transformation for the analysis of transient performance during subsynchronous resonances

Kreischer Ch., Kulig S., Göbel C.

Archives of Electrical Engineering

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2013

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Vol. 62, nr 3

401--415

EN

Long transmission lines have to be compensated to enhance the transport of active power. But a wrong design of the compensation may lead to subsynchronous resonances (SSR). For studies often park equivalent circuits are used. The parameters of the models are often determined analytically or by a three-phase short-circuit test. Models with this parameters give good results for frequencies of 50 Hz and 100 Hz resp. 60 Hz and 120 Hz. But SSR occurs at lower frequencies what arises the question of the reliability of the used models. Therefore in this publication a novel method for the determination of Park equivalent circuit parameters is presented. Herein the parameters are determined form time functions of the currents and the electromagnetic moment of the machine calculated by transient finite-element simulations. This parameters are used for network simulations and compared with the finite-element calculations. Compared to the parameters derived by a three-phase short-circuit a significant better accuracy of simulation results can be achieved by the presented method.

5

Optymalne projektowanie struktur promieniowych sieci elektorenergetycznych z kompensacją mocy biernej

Kulig S., Brożek J.

Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej

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2012

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Nr 31

89-92

PL

Złożoność projektowania struktur przemysłowych sieci elektroenergetycznych warunkują ograniczenia techniczne i ekonomiczne. Wzrost efektywności działań projektantów (zautomatyzowanie i skrócenie czasu projektowania) oraz eksploatacji projektowanej sieci można uzyskać dzięki zastosowaniu dedykowanego oprogramowania. W referacie zostanie przedstawione wykorzystanie programów stosujących algorytmy heurystyczne oraz programowanie dynamiczne do suboptymalnego projektowania struktury elektroenergetycznej sieci promieniowej zakładu przemysłowego z kompensacją mocy biernej. Optymalizowaną funkcją celu jest koszt roczny sieci rozumiany jako suma kosztów: stałego i zmiennego elementów sieci.

EN

The complexity of the designing of structures of industrial power networks is determined by following constraints: technical and economical. Increased effectiveness of: 1) designers (through shortening the design time) and 2) the operation of the proposed network (through minimizing its annual cost) can be obtained by usage of dedicated software. The paper presented the usage of heuristic algorithms and dynamic programming in designing the suboptimal structure of industrial radial power network with reactive power compensation. Optimized objective function is the annual cost of network KR understood as the sum of costs: fixed KS and variable KZ for all elements of the network.

6

Comparison of numerically determined noise of a 290 kW induction motor using fem and measured acoustic radiation

Al Nahlaoui M., Steins H., Kulig S., Exnowski S.

Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały

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2012

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Vol. 66, nr 32, t. 1

333-338

EN

Abstract - In this paper a comparison of numerically determined and measured electromagnetically exited noise of an induction motor is presented. The calculations are accomplished using FEM for an example motor, which is a 290 kW inverter-fed asynchronous machine. The approach starts with the electromagnetic and mechanical consideration. The focus is set on acoustic considerations, which contain the 3D-FE-model and measurement setup in the sound chamber. The determination of the induction and force waves is presented using parts of the results. In the case of the mechanical modeling the three dimensional FE-model is shown.

7

Influence of constructional turbo-generator end region design on end winding inductances

Freese M., Kulig S.

Archives of Electrical Engineering

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2012

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Vol. 61, nr 2

199-210

EN

The paper introduces a comprehensive investigation in end winding inductances of large two-pole turbo-generators. With the aid of an analytic-numeric approach, where Neumann's formula is applied, the influence of geometric characteristics of double-layer stator end windings with involute shape is analysed. This parameter study results in approximation formulas for the stator self and mutual inductances at stand level as well as for the common used end winding leakage inductance. In order to consider field affecting components as pressure plate, flux shield, rotor shaft and rotor retaining ring, finite elements models for two machines (250 MVA and 1150 MVA) are created and computed. The results are integrated in the developed approximation formulas. Finally the simulation results of machine 1 are compared to the data of two different measurements. All approaches introduced in this paper show good correlation. The high speed of the analytic-numeric calculation is combined with the accuracy and opportunity to consider field affecting components within the extensive finite element computation successfully.