电压和电流动态诱导阻抗对VSG低频不稳定性的贡献识别

Weihua Zhou, N. Mohammed, B. Bahrani
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引用次数: 1

摘要

在高有功功率传输和强电网条件下,电力控制器参数调整不当会导致并网虚拟同步发电机的低频稳定性下降。阻抗模型是揭示小信号失稳破坏机制的重要指标。然而,整个阻抗模型混合了所有控制回路的动态,使得很难深入了解高有功功率传输如何通过有功功率控制降低低频稳定性。为了克服这一问题,本文将整个阻抗模型分解为三个部分,分别以电压和电流控制、电容电压动态和输出电流动态为主导。通过识别电容器电压和输出电流的动态,所提出的分解方法可以更清楚地了解高有功功率传输如何降低低频稳定性。具体而言,分解阻抗模型表明,电容电压和输出电流动态感应阻抗分量的q-轴低频相角分别从270°和360°开始,在强电网条件下可能存在低频不稳定问题。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Identification of Voltage and Current Dynamic-Induced Impedance Contributions for Insights into VSG Low-Frequency Instability
The low-frequency stability of grid-connected virtual synchronous generators (VSGs) can be degraded if power controller parameters are not properly tuned under high active power transfer and strong grid conditions. The impedance model of VSGs is an essential indicator that can reveal small-signal instability violation mechanisms. However, the whole impedance model mixes the dynamics of all control loops, making it difficult to gain insights into how high active power transfer degrades low-frequency stability via active power control. To overcome this issue, this paper decomposes the entire impedance model into three parts that are dominated by the voltage and current control, the capacitor voltage dynamic, and the output current dynamic, respectively. By identifying the capacitor voltage and output current dynamics, the proposed decomposition method provides a clearer understanding of how high active power transfer degrades low-frequency stability. Specifically, the decomposed impedance model shows that the qq-axis low-frequency phase angles of the capacitor voltage and output current dynamic-induced impedance components start from 270° and 360°, respectively, leading to possible low-frequency instability issues under strong grid conditions.
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