Consensus Algorithm-based Droop Control and Coefficient Adaptation

Traditional droop control is incapable of achieving precise frequency and voltage regulation, as well as dealing with power imbalance issue caused by inconsistent line impedance in distributed generator (DG) systems. Therefore, an improved droop control strategy is proposed in this paper. The improved strategy solving the two problems using consensus algorithm and coefficient adaptation. First, by constructing dynamic droop coefficients, the method adaptively adjusts frequency and voltage. This ensures accurate frequency and voltage regulation with zero steady-state error in the system. Additionally, a reactive power deviation term is constructed to depict deviation level of each DG in the system. Utilizing the consensus algorithm, reactive power deviation terms lead to zero in the end and precise distribution of reactive power is achieved. Simulation experiments are conducted on the MATLAB/Simulink platform to validate the effectiveness of the proposed control strategy.