柔性直流换流平台关键设备轻型化是实现海上风电经济高效送出的关键问题。从现有柔性直流换流站的桥臂电抗器设计方案出发，提出了柔直变压器复用型桥臂电抗器和分布式桥臂电抗器两种轻型化桥臂电抗器方案，并且阐述了两种轻型化方案桥臂电抗参数的设计方法。基于PSCAD/EMTDC仿真软件分别建立了采用两种轻型化桥臂电抗器方案的海上风电经伪双极柔性直流送出系统模型，对比分析了轻型化桥臂电抗器方案和传统桥臂电抗器方案的系统稳态特性和暂态特性。结果表明，发生直流双极短路故障后，采用两种轻型化桥臂电抗器方案的桥臂电流最大值不超过1.2 p.u.，且子模块电容电压不会大幅下降。当换流器闭锁时，轻型化桥臂电抗器方案的变压器阀侧电压与传统桥臂电抗器方案相比更低。

The key equipment lightweight of the flexible DC converter platform is a crucial problem for achieving economically efficient offshore wind power transmission. Starting from the existing design scheme of bridge arm reactors in the flexible DC converter valve, two lightweight bridge arm reactor schemes, namely the multiplexing and the distributed bridge arm reactor of flexible DC transformer are proposed. The design methods for bridge arm reactor parameters of two lightweight schemes is also elucidated. Based on PSCAD/EMTDDC simulation software, the models of the offshore wind power pseudo-bidirectional flexible DC transmission system based on two lightweight bridge arm reactor schemes are established, separately. And the steady-state and transient characteristics of lightweight bridge arm reactor schemes and the traditional bridge arm reactor schemes are compared and analyzed. The results indicate that after the DC double-pole short-circuit fault occurs, the maximum bridge arm current using two lightweight bridge arm reactor schemes does not exceed 1.2 p.u., and there is no significant drop in sub-module capacitor voltage. Further more, when the converter is locked, it shows that the transformer valve-side voltage of the lightweight bridge arm reactor scheme decreases significantly compared to that of traditional bridge arm reactor schemes.