An adaptive power control strategy in multi-source DC distribution networks based on consensus theory

Abstract

To realize power dispatch and equilibrium in DC distribution networks, a distributed adaptive coordinated control strategy is proposed. Based on the consistency theory, photovoltaics, energy storage and other units in the network can be considered as the same nodes involved in control, where power deviation and equalization coefficient are chosen as state variables in each node. By the interaction and iteration among adjacent nodes, each node can adaptively adjust the operation state according to the dispatching command. On the premise of effectively accepting the real-time dispatching command and optimal control of energy storage, the regulation ability of distributed power supply is fully utilized to suppress the power imbalance of internal load in the system. Meanwhile, the power provided by each distributed source is proportional to its rated capacity under different operating scenarios by adjusting the power reference, and the the prediction the output of each distributed sources is not required. When each individual distributed power supply loses its adjustment ability, the balance of utilization rate of other units can still be ensured. Simulation results under various scenarios verify the effectiveness of the proposed strategy.

Keywords

• dc distribution network
• distributed sources
• distributed control
• consensus theory
• power distribution
• dispatching command