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<p>Due to the overlap in the time scales of controllers, interaction relationships exist between converters. These characteristics are related to the AC grid and controller parameters. To quantitatively analyze the dynamic characteristics of the system, amplitude-phase models of LCC, VSC converters and the AC grid have been established. The self-stability and en-stability damping between converters, which quantifying the interaction relationships, have been proposed. The impact of AC grid, converter capacity and PLL bandwidth on converter interaction has been investigated. Comparative analysis is conducted to examine the impact of the PLL bandwidth on converter stability under the extreme operating capacity. The time domain responses are solved for variations in converter capacity and control parameters, which indirectly validating the accuracy of the frequency domain analysis results. The results indicate that the interaction between converters is primarily influenced by the bandwidth of the PLL controller. The interaction is weakest when the LCC operates at high capacity and the VSC operates at low capacity.</p>

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Analysis of Dynamic Interaction and Oscillation Characteristics in LCC-VSC Combined System

  • 期刊论文

  • 发表日期：

    2025年2月14日

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  • Enming Bai,
  • Jianyuan Xu

摘要

Due to the overlap in the time scales of controllers, interaction relationships exist between converters. These characteristics are related to the AC grid and controller parameters. To quantitatively analyze the dynamic characteristics of the system, amplitude-phase models of LCC, VSC converters and the AC grid have been established. The self-stability and en-stability damping between converters, which quantifying the interaction relationships, have been proposed. The impact of AC grid, converter capacity and PLL bandwidth on converter interaction has been investigated. Comparative analysis is conducted to examine the impact of the PLL bandwidth on converter stability under the extreme operating capacity. The time domain responses are solved for variations in converter capacity and control parameters, which indirectly validating the accuracy of the frequency domain analysis results. The results indicate that the interaction between converters is primarily influenced by the bandwidth of the PLL controller. The interaction is weakest when the LCC operates at high capacity and the VSC operates at low capacity.