探索构网型VSC内控制环的阻尼效应
Exploring Damping Effect of Inner Control Loops for Grid-Forming VSCs
AI总结：
本文提出解析方法，通过阻抗模型和复转矩系数法分析构网型变流器内环的阻尼效应，揭示其对同步和次同步振荡的影响，并经仿真与实验验证。
摘要：
本文提出了一种解析方法，用于探索内环对构网型变流器的阻尼效应。首先，提出一个阻抗模型来表征内环的行为，从而说明它们对输出阻抗塑造的影响。然后，基于阻抗表示，采用复转矩系数法评估内环对系统阻尼的贡献。分析了内环、外环和交流电网之间的相互作用。研究表明，内环塑造了电气阻尼转矩系数，并因此影响同步和次同步振荡模式。采用基于虚拟导纳和电流控制的内环方案来说明所提出的解析方法。案例研究包括阻抗特性的分析、不同电网强度下内环贡献的阻尼转矩分析，以及dq坐标系和αβ坐标系内环实现之间的比较。最后，仿真和实验测试与理论方法和发现相吻合。
英文摘要：
This paper presents an analytical approach to explore the damping effect of inner loops on grid-forming converters. First, an impedance model is proposed to characterize the behaviors of inner loops, thereby illustrating their influence on output impedance shaping. Then, based on the impedance representation, the complex torque coefficient method is employed to assess the contribution of inner loops to system damping. The interactions among inner loops, outer loops, and the ac grid are analyzed. It reveals that inner loops shape the electrical damping torque coefficient and consequently influence both synchronous and sub-synchronous oscillation modes. The virtual admittance and current control-based inner-loop scheme is employed to illustrate the proposed analytical approach. The case study comprises the analysis of impedance profiles, the analysis of damping torque contributed by inner loops under various grid strengths, and the comparison between dq-frame and α\b{eta}-frame realizations of inner loops. Finally, simulation and experimental tests collaborate with theoretical approaches and findings.
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