Research on Three-Port Converter and Its Control Strategy for Mobile Emergency Power Supply

To meet the temporary power supply requirements in scenarios such as sudden disasters and field military operations, mobile emergency vehicle-mounted converters, as a flexible form of distributed power sources, are gradually becoming a critical measure for emergency support of power systems. Nevertheless, in practical applications, power supply under highly asymmetric temporary loads tends to introduce unbalanced components into the system, which further triggers second-harmonic power fluctuations and DC bus voltage oscillations. This makes it difficult to simultaneously guarantee power output stability and unbalance suppression performance. To tackle the above issues, a mobile emergency three-port converter with a decoupled double synchronous reference frame control strategy is proposed. By realizing decoupled control of power output and unbalance mitigation, mutual interference between the two control objectives is effectively eliminated. The system can thereby deliver stable continuous power under unbalanced operating conditions, offering a scalable solution for high-reliability scenarios including emergency power supply. Finally, experimental results verify the feasibility and effectiveness of the proposed control strategy.