Comparative evaluations and coordinated control of energy routers

• Main Author: Cui, Chengjin
• Other Authors: Tang Yi
• Format: Thesis-Master by Coursework
• Language: English
• Published: Nanyang Technological University 2024
• Subjects: Engineering; Energy router; Dual active bridge converter; Control for power electronic converter
• Online Access: https://hdl.handle.net/10356/174300
• Institution: Nanyang Technological University

Energy is a fundamental part of contemporary industries and the basic material of people's lives. However, the current global energy situation confronts many difficulties, such as conventional energy shortages, rising energy consumption, various forms of environmental contamination, climate change, and other issues. Energy Internet was proposed to meet the energy crisis. The development of power electronics, information technology, and communication is the primary driver of Energy Internet promotion. The Energy Router, the central element of Energy Internet, is created and oversees converting energy from one system to another, gathering and exchanging data on power flow, bus voltage, and other things. This project aims to mitigate the double-frequency ripple brought on by cascaded H-bridge inverters and the capacitance of the DC connection by the grid-connected Energy Router with two DC ports. To restore the voltage imbalance caused by mismatched capacitor or load values, the voltage balance control, comprising clusters and individual balance control, is utilized. The average DC voltage of the three-phase cascaded H bridge converters must match the average DC voltage of the cascaded H bridge in each cell for the clusters balancing control to function properly. The individual balancing control is used to bring the DC voltage in each cascaded H bridge cell to the average DC voltage of the corresponding cluster. In this project, the DAB converter serves two important purposes. The conversion of the DC link voltage level to the appropriate level is one, and the double-frequency ripple transmission channel is another. Each DC link capacitor is linked in parallel to two more capacitors and a DAB converter. Shunt capacitor capacitance reduction and ripple cancellation are possible when three DAB converter output ports from the same row are connected in parallel. The desired power may be achieved by adjusting various resistors and their matching voltage levels in two DC output ports.