| 引用本文: | 李鹏坤,李少林,王跃,李润田.基于构网型MMC的混合直流输电受端系统小信号稳定性分析及振荡抑制[J].电力自动化设备,2026,46(2):110-119. |
| LI Pengkun,LI Shaolin,WANG Yue,LI Runtian.Small-signal stability analysis and oscillation suppression of grid-forming MMC-based hybrid HVDC receiving terminal system[J].Electric Power Automation Equipment,2026,46(2):110-119. |
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| 摘要: |
| 针对基于构网型模块化多电平换流器(MMC)的混合直流输电受端系统小信号稳定性问题，考虑MMC交、直流侧间的谐波及频率耦合特性，建立了构网型MMC精确三端口导纳模型，并基于转移导纳概念，探明了构网型MMC交直流端口间谐波传递特性；结合电网换相换流器与交、直流无源网络阻抗，构建了混合直流输电系统等效电路。基于广义Nyquist稳定判据，阐明了正负序及交直流耦合特性对系统稳定性的显著作用，揭示了系统功率电路、控制参数、电网强度等不同因素对系统稳定性的影响及变化规律，明确了主导控制参数，量化了参数可行域；在此基础上，提出了直流电压下垂控制附加低通滤波器的振荡抑制策略，分析了滤波参数对系统稳定裕度的影响规律，实现了交流次/超同步振荡有效抑制。通过硬件在环半实物实时仿真验证了理论分析和控制策略的正确性与有效性。 |
| 关键词: 模块化多电平换流器 构网控制 三端口导纳 谐波传递 小信号稳定性 高压直流输电 |
| DOI：10.16081/j.epae.202511019 |
| 分类号: |
| 基金项目:国家重点研发计划项目(2022YFB4202303) |
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| Small-signal stability analysis and oscillation suppression of grid-forming MMC-based hybrid HVDC receiving terminal system |
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LI Pengkun1, LI Shaolin1, WANG Yue2, LI Runtian2
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1.National Key Laboratory of Renewable Energy Grid-Integration, China Electric Power Research Institute, Beijing 100192, China;2.State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China
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| Abstract: |
| Regarding the small-signal stability issue of grid-forming modular multilevel converter(MMC) based hybrid high voltage direct current(HVDC) receiving terminal system, an accurate three-port admittance model of grid-forming MMC is established, considering the harmonic and frequency coupling characteristics between the AC and DC sides. Based on the concept of transfer admittance, the harmonic transfer characteristics between the AC and DC ports of the grid-forming MMC are investigated. Combined with the impedance of line-commutated converter and the AC and DC side passive network, an equivalent circuit of hybrid HVDC system is established. Based on the generalized Nyquist stability criterion, it is clarified that the coupling characteristics between the positive/negative sequence and the AC/DC side play a significant role on system stability analysis. The influencing laws of parameters in the power stage and control system and grid strength on the system stability margin are revealed. The dominated control parameters are clarified and the feasible regions of parameters are quantified. On this basis, a strategy that adding a low-pass filter in DC voltage droop control is proposed for the suppression of sub/super-synchronous oscillations in DC side, and the influence of filter parameters on stability margin is elaborated. The correctness and effectiveness of the theoretical analysis and control strategy are verified through real-time hardware-in-the-loop simulation results. |
| Key words: modular multilevel converter grid-forming control three-port admittance harmonic transmission small-signal stability HVDC power transmission |
