A Quantitative Analysis and Comparison of In-phase Control and Energy-optimized Control for Series Power Quality Controllers

Quantitative analysis and comparison on the in-phase control and the energy-optimized control for series power quality controllers (SPQC) is quite limited so far in previous publications, not to mention the quantitative comparison for them. In this paper, an extensive quantitative analysis is carried out on these two control strategies of SPQC based on phasor diagram method, and the quantitative comparison for them are discussed accordingly. The load current phasor is used as the reference phasor and this leads to a simpler and clearer phasor diagram for quantitative relationship. Subsequently detailed analysis of SPQC using both the in-phase control and the energy-optimized control are provided for different modes in both voltage sag and voltage swell, from which the analytic expressions and curves for the compensation characteristic of related variables are obtained in different voltage disturbances. The detailed quantitative comparison for the in-phase control and the energy-optimized control are carried out, and the quantitative comparison for these two control strategies is done accordingly. In the end, computer simulation and prototype experimental results are shown to verify the validity of all the analysis and different modes of control.