Intentional Islanding Self-organizing Network Fluctuation Smoothing Relied on Multi-agent Consistency Algorithm

The high penetration of distributed generations is playing a significant role in distribution systems owing to its environmental and economic advantages and power supply flexibility. Distributed generation-based flexibility and reliability of intentional islanding in distribution networks become an important means to maintain power supply to critical loads under fault conditions, which can effectively improve the power supply reliability of distribution networks. However, the self-organizing recovery process of intentional islanding generates large voltage amplitude and frequency fluctuations, which affects the safe and stable operation of islanding and leads to network failure in serious cases. Therefore, this paper proposed a network fluctuation smoothing strategy based on a multi-agent consistency algorithm, designed a distributed frequency-voltage hierarchical control framework, considered the coupling of local information and communication time delay, and adopted a proportional integral control protocol to solve the communication time delay problem. The Lyapunov function is introduced to prove the stability of the proposed strategy and to quantitatively determine the upper bound of the delay. Simulation results show that compared with the use of traditional droop control, the improved control based on the multi-agent consistency algorithm has a stronger anti-interference capability, which can significantly attenuate the voltage and frequency fluctuations in the process of islanding self-organizing and the instantaneous integration of islanding into the main network, and can improve the system dynamics and the power quality.