Abstract
This paper investigates the issues of the distributed energy management problem (EMP) of Microgrids in the presence of communication delays. To address this issue, a consensus-based distributed algorithm is proposed to integrate the economic dispatch and demand response, which can optimally assign the energy among generation units and load units with the objective of maximizing the total social welfare of the power system. Different from existing energy management algorithms, a nonuniform time-varying delays model is considered and embedded into the design of our algorithm, such that each unit can achieve collaborative optimization without the requirement of fixed delays information, which has both theoretical merits and practical engineering value for the efficient and stable operation of Microgrids. Moreover, it is proved that the proposed algorithm can converge to the optimal solution under some sufficient conditions. Finally, the correctness and effectiveness of the proposed method are validated by several simulation results.
Highlights
The higher reliability and flexibility, increasing use of renewable energy, and timely response to changing demands are the requirements for Microgrids in future development
We assume that the G1 ∼ G3 are traditional generators and G4 is renewable generator and its generation is assumed to be constant during the dispatching period
It was worth emphasizing that nonuniform time-varying communication delays are enabled into the design of the proposed algorithm for more practical engineering application value
Summary
The higher reliability and flexibility, increasing use of renewable energy, and timely response to changing demands are the requirements for Microgrids in future development. DR is becoming an important part of Microgrids and market operation, where users can make decisions regarding their power consumption based on their own profit functions to maximize the profits [3] Both the ED and DR are involved in the energy market, and the implementation of one of them will affect the other. With mainly the aforementioned inspirations, aiming at maximizing the total social welfare of power system, VOLUME 7, 2019 the paper focuses on the cooperative EMP of Microgrids with traditional generators, renewable generators, flexible loads, and power losses, where a novel distributed-consensus algorithm with time-varying delays is presented to solve the problem in a fully distributed fashion. Nonuniform time-varying delays of the communication links among units are overcomed effectively by implementing our algorithm With this effort, each unit can obtain the global optimal solution without the requirement of fixed delays information.
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