Abstract:
In the secondary control of microgrids, distributed control methods have received widespread attention due to their high reliability and easy implementation of “plug and play”. However, in practical operation, distributed generation(DG) with far physical distances can generate communication delays, making it difficult for each DG to achieve synchronization, which can seriously affect the stability of the system. Distributed secondary coordinated control of microgrids is implemented based on multi-agent consensus algorithms. The stability of the system is analyzed using Lyapunov functions, and a distributed delay control strategy is designed. Existing research only used the output values of DG voltage and frequency as a reference when designing secondary coordinated control algorithms, and both the variational laws cannot be reflected well. The electrical characteristics of DG is fully considered. The DG small-signal model is introduced based on the state space method in the secondary coordinated control, and the adjustment steps of the distributed time delay controller parameters is given. The simulation results verified the effectiveness of the designed consensus protocol, and revealed the influence of control parameters and delay parameters on the system output.