| Abstract |
Nowadays, adjustable speed drives are used to improve reliability and energy savings in generating-station auxiliary networks. Electric motors are directly connected to the operating machines ( pumps, fans and blowers ) throttling valves, dampers and adjustable guide vanes, in which mechanical or fluid energy is dissipated or wasted, are no longer used. As a result of the successful developments in the field of Power Electronics, and especially frequency converters, ENEL has opted to conduct studies regarding the experimental installation of large variable-speed drives in its power plants. An analog model has been developed to analyze the behavior of the drives under steady state and transient conditions. Analog simulations were carried out with control units interconnected through optical and analog interfaces to a transient network analyzer ( TNA ). This paper presents the results of studies, developed by CESI and ENEL, aiming at investigating the effects of such applications on typical generating-station auxiliary networks. |
