Search

This paper proposes a control strategy for grid-forming converters based on a cascade control scheme with current and voltage controllers and an outer loop to control the injected active and reactive power. The analysis demonstrates the increased disturbance rejection capability of the current controller, and the improved loop gain in the low-frequency region of the voltage controller from the concept of disturbance input decoupling. Simulation results prove the effectiveness of the proposed strategy.

This paper proposes a control strategy for grid-forming converter based on a cascaded control scheme with current and voltage controllers. The theoretical analysis demonstrates the possibility of obtaining almost zero steady-state error for the current loop utilizing only a proportional controller with a magnitude and lead compensation functions to achieve high bandwidth. For the voltage loop, a disturbance input decoupling function is proposed to obtain better dynamic response for the converter under load changes. Simulations results prove the effectiveness of the proposed strategy.