Abstract
In this paper, a distributed energy resource (DER) optimal scheduling method for AC/DC hybrid systems with power electronic transformer (PET) is proposed. Firstly, a PET scheduling model considering loss is established. Secondly, an optimal scheduling model of the AC/DC hybrid system with PET is established. Finally, the optimal scheduling model of the AC/DC system with PET is verified by a case and the effect of PET efficiency on the operating state of the system is discussed. The results show that using the power regulation ability of PET, the distributed generation can be fully absorbed and the operating cost of the system can be reduced.
Highlights
In recent years, with the continuous development of distributed generation technology, more and more clean energy has been applied in power system[1]
Distributed energy resources (DER) access to the power grid is divided into two types: AC access and DC access
An optimal dispatching model is established to verify that the flexible port control ability of power electronic transformer (PET), which can realize the full absorption of distributed energy and reduce the operating cost of the system
Summary
With the continuous development of distributed generation technology, more and more clean energy has been applied in power system[1]. In [6], a unified reduced-order modeling method and a single-stage control strategy of PET for medium and high voltage power grid is proposed. An optimal dispatching model is established to verify that the flexible port control ability of PET, which can realize the full absorption of distributed energy and reduce the operating cost of the system. P ACt represents the interaction power of the AC area and PET at time t , and positive values represent the flow of power from the AC area to PET, negative values represent the flow of power from PET to the AC area;. P DCt represents the interaction power of the DC area and PET at time t , and positive values represent the flow of power from the DC area to PET, negative values represent the flow of power from PET to the DC area. P DC is the maximum interaction power between PET and DC system
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