In a concern for sustainable development, the rational use of electrical energy implies having transportation networks capable of transmitting large quantities of electrical energy over long distances as well as adequate storage plants. This double requirement is the consequence of the fact that electrical energy has to be produced and consumed simultaneously, as direct storage of large quantities is not economically feasible. Nowadays, as thermal power plants and runoff river plants are always working at their nominal power for economic reasons; it is not possible to cover the large space and time demand variations without having an efficient transportation network and adequate storage capacities. The recent start up of major windformer sites also implies the need for supplementary storage capacities. The inventory of large storage plants reveals the solution "pump-storage plant" as being one of the best in terms of storage potential, flexibility, reliability, response time, efficiency, risks and costs. Nearly all the pump-turbine groups operating today consist of synchronous motorgenerators working at the network frequency and therefore at constant speed. The performance and efficiency of such groups can be significantly improved by using variable speed motor-generators, and more specifically doubly-fed asynchronous motor-generators. The few variable speed units in operation today are equipped with a cyclo-converter cascade. The purpose of the present thesis is to propose the replacement of the cycloconverter solution by a back to back 3-level VSI cascade and investigate the complete regulation strategy.
Abstract:The present paper addresses an advanced teaching lab consisting of setting up an islanded production unit. This teaching lab takes place in the very last semester at master level for students in electrical engineering with energy specialization. The purpose of this teaching lab is to combine knowledge learned in different areas such as power electronics, control, electrical machines and networks, and make use of all of them in practice. The present paper describes in detail the different steps followed by the student to set up an islanded production unit.
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