Dynamic Harmonic Analysis of Electric Energy Routers with Common High Frequency Bus Under Multi-Source-Load Interaction

With developing renewable energy and accelerating the transformation of energy to the clean and low-carbon direction having gradually become the theme of energy development around the world, traditional power systems cannot cope with many challenges such as unstable output and harmonic injection caused by the high proportion of new energy and high proportion of power electronic equipment. The electric energy router with common high-frequency bus based on power electronic devices can not only provide flexible and diverse interfaces for multi-source-load interaction scenarios, but also realize the function of actively controlling and managing the multi-directional flow of energy. The main task of this paper is to perform dynamic harmonic analysis for different working conditions and control strategies of the established electric energy router model under the interaction of multiple sources and loads. Firstly, the article introduces the current development status of electric energy routers with its various types of topological structures and gives the working principle and control strategy of the multi-port electric energy router with common high-frequency bus. Then it analyzes the coupling relationship of energy flow between different ports. Finally, the article designs different multi-source-load interaction scenarios to study its impact on system harmonic injection. In the follow-up simulation verification, the results verify that the dual-loop decoupling control strategy can suppress the harmonics injected by the router into the power system, and the dual-phase-shift control strategy can achieve flexible control of the direction of power flow inside the router. This article establishes a dynamic harmonic analysis model of the electric energy router with common high-frequency bus for the purpose to lay the foundation for the harmonic analysis of the multi-source-load interaction system.