Abstract
In the AC/DC hybrid microgrids equipped with power electronic transformer (PET), different AC grids and DC grids are connected through multiport PET to operate the entire network in a secure and economic manner. This paper proposes a decentralized optimal power flow model, considering the multiport coordinated control strategy of PET, for running autonomous AC/DC hybrid microgrids. To optimize the power flow in the network, the steady state model of PET is established, including voltage source converter power injection model and Kriging model. By introducing a secondary droop control layer can realize the autonomous operation of AC/DC hybrid microgrids and increase the utilization efficiency of distributed generations. Then using the analytical target cascading approach, each AC/DC sub-microgrid is regarded as different autonomous subjects. The distributed PET is as power coupling node and information interaction node to decompose the optimal problem of AC/DC hybrid microgrids equipped with PET which is solved in parallel. The obtained subproblems for these grid levels are solved with a nested solution process. The simulation results verify the correctness and effectiveness of the proposed model in this paper.
Highlights
The power electronic transformer (PET) is called solid state transformer (SST) or energy router [1], [2]
This paper proposes a decentralized optimal power flow model for running autonomous AC/DC hybrid microgrids equipped with PET
SIMULATION RESULTS an AC/DC hybrid microgrids equipped with PET system is used to investigate to test the effectiveness of the proposed operation approach
Summary
The power electronic transformer (PET) is called solid state transformer (SST) or energy router [1], [2]. Derived based on the circuit equations of the voltage source converter (VSC) [6] On this basis, the steady state model for PET has been proposed with considering the power loss characterization of VSC, and it can be applied to the AC/DC hybrid microgrids [7]. A few researches have investigated the solve approach in a hybrid AC/DC system, including traditional mathematical programming methods and the intelligent algorithms [23], [24] These works usually solve the optimization problem in a centralized manner, whereas the idea of centralized control in the traditional power system will become impractical once the size of microgrids grows to a certain extent. To the best of our knowledge, the decentralized optimization problem about it has not been fully researched On this basis, this paper proposes a decentralized optimal power flow model for running autonomous AC/DC hybrid microgrids equipped with PET. The parameters on the AC grid side and DC grid side, including the injection power and the voltage, of each port can be independently controlled by the flexible VSC-based AC/DC and DC/DC converter
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