Abstract
The AC/DC hybrid distribution network is composed of a medium-voltage DC bus, a low-voltage DC bus, and a power electronic transformer, and has the characteristics of multi-voltage level, multi-DC bus, and multi-converter, so its operation mode and optimal scheduling strategy are more complex. Firstly, this paper constructs the AC/DC hybrid distribution network using an power electronic transformer. Then, a two-layer control structure including a scheduling management layer and a bus control layer is proposed, which simplifies the control structure and gives full play to the role of “energy routing” function of the power electronic transformer. Moreover, the minimum operation cost of the AC/DC hybrid distribution network in the whole scheduling cycle is taken as the optimization objective, considering the characteristics of various distributed generations, the structure of AC/DC hybrid distribution network, and the interaction of “source–load–storage”. Finally, the optimal scheduling model of the AC/DC hybrid distribution network based on power electronic transformer is established, and the feasibility of the optimal scheduling strategy is verified by the open-source solver, which can realize the complete absorption of renewable energy and the optimal coordinated control of “source–load–storage”.
Highlights
IntroductionPublisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations
On the basis of the existing research work, this paper proposes an optimal scheduling strategy for AC/DC hybrid distribution network based on power electronic transformers
A typical AC/DC hybrid distribution network based on power electronic transformer is shown in Figure 2, which is mainly composed of a power electronic transformer, an AC
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. The AC/DC hybrid distribution network has the advantages of flexible power scheduling, high system efficiency, large power capacity, low line loss, high power quality, and reactive power compensation It is suitable for distributed generation, energy storage devices, and DC loads to access flexibly; helps to solve a series of new problems in the development of traditional AC distribution network; and is important in developing the direction of the power distribution network [1,2,3,4,5]. References [13,14,15] propose a layered control strategy, which combines distributed control with upper management, improving the reliability and enhancing the economy of the system This layered control strategy is mainly aimed at low-voltage DC microgrid and is not suitable for the research object of this article, that is, the AC/DC hybrid distribution network based on power electronic transformers.
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