Coordinated fault ride‑through control strategy for the receiving‑end AC grid of a DRU‑MMC‑based renewable energy HVDC transmission system

JI Xiaotong; XIONG Ping; ZHAO Yifan; LIU Dan; JIA Shuaiqiang; LAI Jinmu

doi:10.19783/j.cnki.pspc.260196

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Coordinated fault ride‑through control strategy for the receiving‑end AC grid of a DRU‑MMC‑based renewable energy HVDC transmission system

更新时间：2026-10-16

- Coordinated fault ride‑through control strategy for the receiving‑end AC grid of a DRU‑MMC‑based renewable energy HVDC transmission system
- Power System Protection and Control Vol. 54, Issue 17, (2026)
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- DOI：10.19783/j.cnki.pspc.260196
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- Published：2026
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JI Xiaotong, XIONG Ping, ZHAO Yifan, et al. Coordinated fault ride‑through control strategy for the receiving‑end AC grid of a DRU‑MMC‑based renewable energy HVDC transmission system[J]. Power System Protection and Control, 2026, 54(17).
DOI：

JI Xiaotong, XIONG Ping, ZHAO Yifan, et al. Coordinated fault ride‑through control strategy for the receiving‑end AC grid of a DRU‑MMC‑based renewable energy HVDC transmission system[J]. Power System Protection and Control, 2026, 54(17). DOI： 10.19783/j.cnki.pspc.260196.

摘要

针对二极管整流单元 (diode rectifier unit

DRU)‑模块化多电平换流器 (modular multilevel converter

MMC) 新能源直流送出系统受端电网故障时因盈余功率导致的子模块电容与直流线路过电压问题，提出一种基于子模块电容储能与直流耗能装置协调的受端交流故障穿越策略。首先，分析 DRU‑MMC 系统受端交流电网故障期间的故障特性，推导不同故障工况下子模块最大储能时间数学约束关系，揭示不同送端功率以及不同电压跌落深度下受端 MMC 子模块储能 3 种运行模式工作原理。在此基础上，提出基于桥臂电流限幅的自适应子模块电容电压预设方法。结合三级能量优化算法，保证子模块电容电压跟踪参考值并维持电压均衡，实现器件安全约束下的能量暂存与有序释放。最后，通过仿真验证所提故障穿越策略的有效性。

Abstract

To address the overvoltage problems of MMC submodule (SM) capacitors and DC transmission lines caused by surplus power during receiving end AC grid faults in a renewable energy HVDC transmission system based on a diode rectifier unit (DRU) and a modular multilevel converter (MMC)

this paper proposes a coordinated fault ride‑through strategy that combines SM capacitor energy storage with a DC energy dissipation device. First

the fault characteristics of the DRU‑MMC system during receiving‑end AC grid faults are analyzed. Mathematical constraints on the maximum energy storage duration of the SM capacitors under different fault conditions are derived

and the operating principles of three SM energy storage operation modes under different sending‑end power levels and voltage sag depths are revealed. On this basis

an adaptive SM capacitor voltage reference setting method based on arm current limit is proposed. Combined with a three‑level energy optimization algorithm

the proposed strategy enables accurate tracking of the SM capacitor voltage reference while maintaining capacitor voltage balance

thereby achieving temporary energy storage and orderly energy release under device safety constraints. Finally

the effectiveness of the proposed fault ride‑through strategy is verified by simulations.

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references

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