Research on a New Type of Magnetically Controlled Reactor Based on Composite Magnetic Materials

The magnetically controlled reactor (MCR) enables large-range, continuously smooth regulation of reactive power, but it suffers from drawbacks such as slow response speed and high magnetic valve losses. To address these deficiencies, this paper proposes new type of three-phase magnetically controlled reactor (NMCR) based on composite magnetic materials, along with its control method. By adopting a magnetic circuit structure made of composite magnetic materials and incorporating a fast excitation circuit, the dynamic response and operational performance of the device are enhanced. First, the topology and working mechanism of the MCR are analyzed to reveal the performance limitations of the traditional MCR (TMCR). Second, the selection of soft magnetic materials for the magnetic valve section and the design of key parameters are completed. Third, a fast excitation circuit is designed based on an IGBT full bridge. Finally, an electromagnetic transient simulation model is established for verification. Both theoretical analysis and simulation results demonstrate that the proposed NMCR achieves a 5.07-fold improvement in response speed while maintaining excellent continuous reactive power regulation capability, and reduces the magnetic-valve losses by over 80%.