Study on grid feed forward strategy under Unbalanced Grid Condition

In the case of unbalanced power grid, the disturbance of the power grid is introduced into the feed forward accurately, thus, the output feed-forward part of the inverter is in perfect agreement with the unbalanced power grid, in order to achieve good and effective control of the current of the converter in the dynamic change of the power grid. Due to the filtering delay of voltage sampling circuit, in the case of unbalanced power grid, phase compensation is also required for the delay of the negative sequence component, to ensure that the feedforward part of the grid is correct. The feed-forward control strategy of power grid under unbalanced and balanced power grid is simulated. The results show that the scheme can optimize the feed-forward component of the power grid and control the current of the converter effectively.