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CERA97 - CERA 97 OPTIMIZED DESIGN OF VARIABLE-SPEED DRIVES...

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CERA 97 OPTIMIZED DESIGN OF VARIABLE-SPEED DRIVES AND ELECTRICAL NETWORKS BASED ON NUMERICAL SIMULATION J.-J.Simond, B.Kawkabani, A.Sapin, P.Allenbach Swiss Federal Institute of Technology, Electrical Engineering Dept., CH-1015 Lausanne tel: 4121 / 6934804, fax: 4121 / 6932687 Switzerland Abstract: The present paper describes the modelling and the prediction of the steady-state or transient behaviour of different modern variable-speed drives and electrical networks. The necessity of a performant numerical simulation tool in order to guarantee an optimized design is illustrated by examples based on existing large variable-speed drives and power plants. Keywords : variable speed drive, electrical network, converter, regulator, dynamic behaviour. Summary During the last few years the performances and therefore the complexity of the variable-speed drives as well as those of the modern power plants have considerably increased. Consequently, an optimized design of these equipments requires suitable numerical simulation tools in order to guarantee the feasibility and the performances of such equipments in steady-state or transient operation. More precisely, it is no more sufficient to simulate separately the behaviour of the different elements, even based on sophisticated models, it is necessary to simulate globally all the system in order to take into account all the possible interactions which are often primordial for the system performances. In a practical viewpoint a suitable simulation tool should be able to consider all the elements used in a complex system (machines, converters, load, supply, control and regulation equipment, protection devices, filters, ...) for any system topology. In this paper, the modelling of different existing large industrial drives or electrical networks based on modern technologies are described, including the synchronous machine with 2x3 phase stator winding. It is shown how the use of performant simulation tools helps to reach an optimized design [ 1,2,3 ] . Examples of applications. All values are given in (p.u.). Example 1: 12 pulse LCI-fed synchronous motor Fig.1: 12 pulse LCI-fed synchronous motor 21 MVA, 2x3.3 KV, 39.17 Hz, 2p = 10 ia1, ib1, ic1, uab1 tem Fig.2: steady-state operation, tmec = 0.9, n = 1.
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ia1, uab1 n, tem Fig.3: transient operation, modifications of the speed and torque set values Example 2: Induction motor with a 6-pulse- cascade Fig.4:
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