## 6 Conclusions  
This paper proposes a novel topology for a VSC based on reinjection technology. The topology leverages the submodules' capability to generate multilevel voltages by dynamically connecting them in series as a reinjection circuit while also enabling ZVS for the main bridge switches. Furthermore, the RMVSC can output power with low harmonic distortion without requiring filters. Compared to PWM converters, the switching frequency is significantly reduced, minimizing associated losses. By analyzing the conditions necessary for submodule voltage balancing, a cyclic drive modulation strategy was developed for the reinjection circuit. An equivalent model of the RMVSC-STATCOM system was established and analyzed, forming the foundation for a dual-loop control scheme. Simulations were performed using the designed cyclic drive modulation strategy, reactive power control strategy, and parameter design, leading to the following conclusions:  
1. The new RMVSC topology draws upon the cascaded H-bridge RMVSC structure and leverages the multilevel output capability of submodules. Submodules are series-connected to replace the cascaded H-bridge in the reinjection circuit. The modular structure of the reinjection circuit, comprising multiple submodules connected in series to form a dc bus, supports high voltage and large capacity while reducing equipment size and cost. Figure 12: Simulation results of RMVSC-STATCOM full-range reactive power compensation capability; (**a**) reactive power compensation tracking; (**b**) power factor waveform; (**c**) dq-axis current tracking; (**d**) dc voltage waveform. 2. Through theoretical derivation, a cyclic driving pulse for the 7-level RMVSC reinjection circuit is designed, ensuring dynamic voltage balance in the reinjection circuit. The cyclic driving pulse is symmetrical relative to the half-cycle of the pulsation current, allowing each switch in the reinjection circuit to operate once per pulsation current cycle, thereby reducing switching complexity, frequency, and associated losses. 3. A dual-loop control strategy suitable for RMVSC-STATCOM is proposed, consisting of an outer power loop and an inner current loop. This strategy enables continuous, bidirectional reactive power compensation with high control accuracy and excellent regulation performance. 4. The validity of the proposed RMVSC topology, as well as the effectiveness of the cyclic drive pulse and reactive power control strategy, has been rigorously validated through simulation results. The results demonstrate that the cyclic drive pulse enables the submodules to maintain excellent voltage balance while allowing the RMVSC to operate at a low switching frequency. This results in a significantly reduced harmonic content in the output voltage. Furthermore, the system exhibits no voltage distortion during dynamic reactive power adjustment, underscoring its robust dynamic performance and overall stability. This study offers new insights into control strategies for reinjection converters and their reactive power compensation. Conceptualization, C.H. and B.Y. ; methodology, C.H. ; software, C.H. ; validation, C.H., B.Y. and Z.L. ; formal analysis, G.L. ; investigation, Z.L. ; resources, B.Y. ; data curation, C.H. ; writing--original draft preparation, C.H. ; writing--review and editing, B.Y. ; visualization, Z.L. ; supervision, G.L. ; project administration, B.Y. ; funding acquisition, B.Y. All authors have read and agreed to the published version of the manuscript. This research was funded by the Project \"Organized Scientific Research Project of Inner Mongolia Autonomous Region\", grant number 2024 JBGS0052, the Project \"Natural Science Foundation of Inner Mongolia\", grant number 2023 MS05004, and the Project \"Basic Scientific Research Expenses Program of Universities Directly under Inner Mongolia Autonomous Region\", grant number ZTY2024026. Not applicable. The original contributions presented in the study are included in the article; further inquiries can be directed to the corresponding authors.