Active and reactive power based feedback linearization control technique for grid-connected voltage source converter

This paper proposes a new feedback linearization control strategy for the grid-connected voltage source converter (VSC). The instantaneous power components at the VSC terminal are being utilized as its dynamic variables. It is due to fact that, as these power components can be directly computed from the three-phase instantaneous voltage and current components measured at the VSC terminal, the need of abc-to-dq transformation, i.e. the unmodelled dynamics of the phase lock loops (PLL) is significantly avoided at this stage. In addition, as these components are being utilized in the proposed feedback linearization control strategy, this becomes an added benefit of reducing the computational complexity of the algorithm with an advantage of improving the stability of the VSC subjected to some intricate disturbances. The robustness and accuracy of the proposed control strategy has been verified in the MATLAB/Editor and it has been proved to be a superior method as compared to the conventional methods as is illustrated in the simulation and result section.