Self-recovery comepensation strategy for dynamic voltage regulator

A new self-recovery compensation and control strategy suitable for dynamic voltage regulator (DVR) supplied by DC-capacitor was proposed. Two compensation stages which were transient compensation stage and recovery compensation stage were included in the strategy. The maximum energy compensation strategy which could maximize the exchange active power between the equipment´s DC-capacitor and its outside system was proposed to the recovery stage. Moreover, the double closed-loop control strategy with load voltage and filter capacitor current was used. A stages switching control strategy which took both of the DC-capacitor voltage magnitude and source-side voltage magnitude as the criterion was applied. The simulation results of EMTDC/PSCAD show that the voltage of DC-capacitor could be recovered to the nominal value as soon as possible with the proposed strategy. And the strategy could be suitable for the compensation of several times transient voltage disturbances in short period flexibly.