VSC-HVDC technology has great application prospects in the field of offshore wind system. In order to realize the capability of fault ride through of offshore wind VSC-HVDC system, this paper proposes a modular multilevel converter with integrated energy dissipation equipment (IEDE-MMC), which combines the complementary advantages of MMC and DC chopper. The working process of the short-time pulse of the energy dissipation equipment provides an opportunity for the use of low current switch devices, and it shares the water-cooling system, control-protection system and energy-supply system with the MMC submodule, which eliminates the independent systems required by the traditional DC chopper, providing an economic and reliable solution for the problem of fault ride through. The simulation results of 400 MW/±150 kV VSC-HVDC system verify the fault ride through capability of IEDE-MMC, and the peak value of DC voltage is less than 1.1 p.u., which meets the requirements of the system. Finally, the manufacturing cost and floor area of IEDE-MMC are analyzed. Compared with the scheme of adding DC chopper outside MMC, the IEDE-MMC cost is reduced by 22%, and the total floor area is reduced by 35%.

中文翻译：

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一种用于海上风电 VSC-HVDC 系统的集成消能设备的模块化多电平转换器

VSC-HVDC技术在海上风电系统领域具有很大的应用前景。为了实现海上风电 VSC-HVDC 系统的故障穿越能力，本文提出了一种集成能量耗散设备的模块化多电平换流器（IEDE-MMC），它结合了 MMC 和直流斩波器的互补优势。耗能设备短时脉冲的工作过程为小电流开关器件的使用提供了机会，它与MMC子模块共享水冷系统、控制保护系统和供能系统，消除了传统直流斩波器所需的独立系统，为故障穿越问题提供了经济可靠的解决方案。400 MW/±150 kV VSC-HVDC系统仿真结果验证了IEDE-MMC的故障穿越能力，直流电压峰值小于1.1 pu，满足系统要求。最后，分析了IEDE-MMC的制造成本和占地面积。与MMC外加DC斩波器方案相比，IEDE-MMC成本降低22%，总占地面积减少35%。