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This paper describes the design and implementation of a new solution to power quality problems associated with large unbalanced nonlinear loads at fine glass furnace production utilities. Such furnaces use two-phase electricity for reasons of enhanced temperature control and in order to maintain consistency of glass viscosity. A significant risk of power failure is introduced due to this requirement. The furnace load is also nonlinear in nature, due to temperature control by electronic power switching. This gives rise to risks associated with high harmonic distortion. A new method in design of filters to alleviate problems associated with this type of load is also described.
Coyle, Eugene and Farrell,M. and Campbell, W. J. :Combining capacitor/inductor and idling asynchronous motor in design of a system for balance of a large two-phase industrial load over three phases. PEMD 2004:second International Conference on power electronics, machines and drives, 31 March - 2 April, 2004, pp.600-604.