Evaluation and Enhancement Method of the Distributed Photovoltaic Carrying Capacity Based on Combined Energy Router
DOI:
https://doi.org/10.13052/dgaej2156-3306.4024Keywords:
Distributed photovoltaic carrying capacity, reverse power flow, voltage violation, hybrid distribution transformer, energy storage system, combined energy router, power qualityAbstract
As more and more distributed photovoltaic (DPV) systems are connected to distribution substation, it has severely exceeded the limits of the carrying capacity for the DPV in the substation. Consequently, this leads to problems such as reverse power flow, voltage violation, and harmonic pollution at the point of common coupling. To solve these problems, a combined energy router (CER) based on hybrid distribution transformer and energy storage system is proposed. Firstly, the distribution substation architecture with the CER and the power flow direction are introduced. Secondly, the topology and control strategy of the CER are presented. Thirdly, a carrying capacity evaluation model considering different constraints is established based on the limited factors of the DPV carrying capacity. Through linear calculations, the DPV carrying capacity is evaluated under different methods. Additionally, the economic benefits derived from the CER are verified by utilizing electricity prices. Finally, a DPV simulation system based on CER is established in MATLAB/Simulink to verify the feasibility of the proposed method in terms of enhancing the DPV carrying capacity.
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