Cubic spline interpolation-based method for modeling fluorescent lamp dynamic conductance

Fluorescent lamps are increasingly used in daily life, in which the gas discharge is the lighting principle. Due to the internal nonlinear characteristics of the lamp tube, harmonic currents are produced when the voltage source is directly connected to the lamp. Furthermore, in order to maintain the stable output of the lighting device, the ballast circuit is used. In practice, accurate fluorescent lamp models for harmonic studies are of importance to understand harmonic pollutions caused by fluorescent lamps. This paper presents a fluorescent lamp dynamic conductance model by using cubic spline interpolation method. To show the usefulness of the proposed model, a 10-W conventional 60Hz fluorescent lamp and a 20-W high-frequency fluorescent lamp are under tested. The laboratory experiments are also performed to verify the accuracy of the proposed model.