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Evaluation and Selection of Supplementary Damping Strategies for Renewable Energy Generation Units Based on Damping Reshaping Effects
WANG Xiao, FU Xiaoqiang, SU Tianyu, DAI Jinshui, LÜ Jing
Electric Power Construction ›› 2026, Vol. 47 ›› Issue (11) : 116-127.
PDF(2042 KB)
PDF(2042 KB)
Evaluation and Selection of Supplementary Damping Strategies for Renewable Energy Generation Units Based on Damping Reshaping Effects
[Objective] To address the lack of a unified quantitative criterion for evaluating supplementary damping control schemes in renewable energy units and the difficulty of jointly selecting feedback signals and injection locations， a strategy selection method based on the damping reshaping effect index （DREI） is proposed. [Methods] Candidate control combinations were constructed by combining voltage， current， power， DC-link voltage and phase-locked loop （PLL） angular-frequency signals with typical injection locations in the converter control loops. A positive-sequence impedance model considering machine-side dynamics was established through dq-domain impedance modeling and sequence transformation. DREI was defined as the integral of the negative region of the real part of the positive-sequence impedance， and was used to quantify the ability of each control combination to weaken negative damping and to rank candidate schemes. [Results] Impedance analysis， Nyquist stability analysis and time-domain simulation show that the impedance reshaping effect varies significantly with feedback signal and injection location. The scheme using the grid-side q-axis current as the feedback signal and injecting it into the q-axis current inner loop achieves the minimum DREI and provides the best negative-damping suppression and stability-margin improvement. [Conclusions] DREI can uniformly characterize the impedance reshaping capability of supplementary damping control over the full frequency range， providing a quantitative basis for supplementary damping strategy design and wideband oscillation stability analysis of renewable energy units.
renewable energy unit / supplementary damping control / impedance reshaping / damping reshaping effect index / wideband oscillation stability
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Applying the state space modeling method, the small disturbance models of different wind farms connected to the power grid through paralleled AC and DC lines are established, and the generation mechanism of various oscillation modes in the system is analyzed in detail. Furthermore, the differences of the effects of system structure parameters and key controller parameters on the natural oscillation mode and coupled oscillation mode of the system are analyzed. On this basis, the interaction mechanism and factors between AC and DC system are revealed. The correctness of the system is verified by time-domain simulation on PSCAD / EMTDC platform. The results show that the influence of system parameters on the coupled oscillation modes between AC and DC systems is complex. |
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利益冲突声明（Conflict of Interests）： 所有作者声明不存在利益冲突。
作者贡献声明（Authors' Contributions）： 王潇提出研究思路与总体研究框架，指导研究方案设计及论文撰写与修改；付肖强设计研究方案，开展新能源机组阻抗建模、DREI指标构建、理论分析与仿真验证，完成论文初稿撰写；苏田宇参与研究方案设计、仿真分析、结果讨论及论文修改；戴金水参与理论分析、仿真验证、研究结果分析与论文修改；吕敬提出研究方向，指导研究思路、技术路线及论文框架，审核并修订论文。所有作者均阅读并同意论文终稿内容。
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