【目的】针对新能源机组附加阻尼控制方案缺乏统一量化评价依据、反馈信号与接入位置难以协同优选的问题，提出基于阻尼重塑效果评价指标（damping reshaping effect index，DREI）的附加阻尼策略优选方法。【方法】构建涵盖电压、电流、功率、直流电压和锁相环角频率等输入信号及多类接入位置的候选控制组合；基于计及机侧动态的dq阻抗模型和序阻抗变换获取新能源机组正序阻抗；以正序阻抗实部负值区域积分定义DREI，量化不同控制组合对负阻尼特性的削弱能力，并据此形成控制方案排序。【结果】阻抗分析、Nyquist稳定性分析和时域仿真表明，不同输入信号和接入位置的阻尼重塑效果差异明显；以网侧q轴电流为反馈信号并接入电流内环q轴时，DREI最小，负阻尼抑制和稳定裕度提升效果最优。【结论】DREI可从全频段角度统一表征附加阻尼控制的阻尼重塑能力，为新能源机组附加阻尼策略设计与宽频振荡稳定性分析提供量化依据。

[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.