Multiport Electrical Energy Routing Technology for Vehicle-Grid Interaction in Integrated Microgrid

With the progressive transformation of global energy structures, an system, integrating electrical power source, grid, load and energy storage has emerged as a promoting way for enhancing the flexibility and reliability of a power system highly penetrated by distributed renewable. Vehicle-grid interaction (VGI), serving as a convertible role between emerging loads and power source, becomes a central player in virtual power plant (VPP) application. While VGI facilitates a local absorption of distributed photovoltaic and peak-valley load regulation, it concurrently faces technical challenges, such as dynamic power flow management caused by random load behavior and real-time coordination even without effective communication. In practice, power fluctuations caused by VGI may result in voltage transient or harmonic distortion problems. Additionally, improvements are still required for power electronic conversion in the case of wide voltage range operation and dynamic response speed. Although modular topologies offer an improved compatibility for power electronic building block (PEBB), optimizations are always desired to compromise the costs and system complexity. This paper explores the basic role of electrical energy routing technology in an integrated microgrid, aiming to merge VGI in the future. Based on the analysis of electrical specifications and suitable topologies of power conversion, authors discusses the technical adaptability and optimization directions of multi-port converter. This paper is committed to provide ideas on the ‘power source-grid-load-storage-EV’ coordinated operation in an integrated microgrid scenario.