在直流输电领域，基于谐波注入理论形成的新型注入式电网换相换流器（reinjection line commutated converter，RLCC）相比于传统电网换相换流器（line commutated converter，LCC）具有换流器内部谐波抑制能力、换相失败完全抑制能力和触发角超前滞后双模运行能力等显著优势。针对现有RLCC只具有单一控制变量触发角不能实现有功功率和无功功率解耦控制的问题，通过在其分流模组各注入支路增设续流二极管并引入调制系数控制变量，构成一种可实现功率解耦控制的新型RLCC。基于拓扑结构及工作原理，简要分析交直流侧理论电流波形，推导新型RLCC稳态数学模型。根据新型RLCC运行特性确定调制系数工作范围、功率运行范围和实现单位功率因数运行的条件。最后，提出了一种在常规定电流反馈控制基础上结合功率因数前馈控制的功率解耦控制方法，并通过仿真验证所提控制方法的可行性和正确性。

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.