Quantitative Analysis on Different Modes of Energy Optimal Control for Series Power Quality Controllers

Quantitative analysis on the energy optimal control for series power quality controllers (SPQC) is quite limited so far in previous publications. In this paper, an extensive quantitative analysis is carried out on the energy optimal control of SPQC based on phasor diagram method. The load current phasor is used as the reference phasor and this leads to a simpler and clearer phasor diagram for quantitative relationship. Three different modes for the energy optimal control strategy of SPQC are then proposed according to different relationship between the source voltage magnitude and the load power factor. Subsequently detailed analysis of SPQC under the energy optimal control is provided for different modes in both under voltage/voltage sag and over voltage/voltage swell. In the end, simulation and experimental results are shown to verify the validity of all the analysis and different modes of control