Research on Topology and Control Strategy of External Energy Harvesting Hybrid Power Transformer

To solve the problem of load voltage fluctuation in distribution network with multiple renewable energy generators and heterogeneous loads, an external energy harvesting hybrid power transformer topology is proposed in this paper at first. Then, the fundamental principles of voltage regulation and reactive power compensation for the transformer are researched. And the theoretical mathematical models for the three-phase full bridge converter and H-bridge converter in the topology are constructed. Afterwards, the control strategies of voltage regulation and reactive power compensation of hybrid power transformers are proposed to achieve the goals of rapid adjustment of load side voltage and reactive power compensation in distribution network. Ultimately, the voltage regulation performance and reactive power compensation performance of proposed strategies are simulated and analyzed.