Voltage Flickers as Voltage Quality Problem in Industrial Sector

Abstract

Very important parameter of product called electricity is voltage quality. In recent times electricity became a commodity that has its price and it is known that any commodity today must have an appropriate quality for its price. That applies for electrical energy as well. Influence of loads based on nonlinearity, power electronic and renewable energy sources connected on distribution network has great consequences on voltage quality. This paper deals with voltage quality in industrial facilities. Industrial facilities connected on distribution network can be various types. Those consumers set very high requirements for reliability and voltage quality. Supply disruption and poor voltage quality leads to production losses in facilities which results with financial losses and dissatisfaction of facility owners. In this paper several measurements in different facilities are taken and analyzed. Those measurements and their results are presented. Focus is placed on worst voltage quality parameter that appears in most measurement cases—voltage flickers. Voltage flickers might be caused due to distribution network or facilities themselves. Causes and consequences of those voltage flickers are analyzed in continuation of this paper.