In the field of direct current transmission, the new reinjection line commutated converter (RLCC) based on the theory of harmonic reinjection has significant advantages over the traditional line commutated converter (LCC), such as internal harmonic suppression ability, complete suppression of commutation failure, and dual-mode operation with leading and lagging trigger angles and so on. Aiming at the problem that the existing RLCC cannot decouple active power and reactive power with a single control variable firing angle, a new type of RLCC that can decouple power control is formed by adding freewheeling diodes to each reinjection branch of its shunt module and introducing modulation coefficient control variables. Based on topological structure and working principle, the theoretical current waveforms of AC and DC side are briefly analyzed. And the steady-state mathematical model of the new RLCC is derived. Based on the operating characteristics of the new RLCC, the working range of modulation coefficients, power operating range, and conditions for achieving unity power factor operation are determined. Finally, based on the current feedback control, a power decoupling control method is proposed combined with power factor feedforward control. The feasibility and correctness of the proposed control method are verified by simulation.