SVG reactive power compensation under unbalanced power grid, cascaded H-bridge SVG reactive power compensation statcom, using a three-layer control strategy.
(1) The first layer adopts voltage and current dual closed-loop PI control, with positive and negative sequence separation of voltage and current. The voltage outer loop generates fundamental positive sequence active current, and the average voltage on the DC side of all H-bridge modules is constant. The current inner loop adopts feedforward decoupling control;
(2) The second layer of phase to phase voltage balance control injects zero sequence voltage to maintain phase to phase voltage balance;
(3) The third layer of intra phase voltage balance control ensures that all sub modules absorb active power and compensate for their losses, thereby ensuring that the DC side voltage value of all H-bridge sub modules is equal to the given value.
email: modeling199308@gmail.com