Abstract
Three-phase four-leg inverters widely used in microgrid can effectively provide the power for the non-linear/unbalanced loads. Here, the non-linear composite controller is proposed for three-phase four-leg inverter system under d q 0 reference frame by integrating a higher order sliding mode observer and finite-time control technique. The observer adopts the soft sensing manner to feedforward compensate external disturbances caused by current variation of AC bus node, which relaxes some physical constraints. Meanwhile, the higher order sliding mode observer realises the decoupling of the inverter system, which paves the way for the construction of the non-smooth finite-time control law. Finally, the simulation results with PI comparison illustrate the feasibility of the proposed method for improving the robustness, stability, and rapid recovery capability of system.
Published Version
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