SummaryVirtual synchronous generators (VSGs) are comprised of an outer power loop and inner cascaded control loops. The dynamic performance of the output interface is severely degraded when microgrid loads exhibit variability and nonlinearity. Therefore, robustness against load disturbances must be possessed by any voltage control scheme. In this paper, a proportional resonance‐linear active disturbance rejection control (PR‐LADRC) scheme based on an improved linear extended state observer (ILESO) is proposed for VSG voltage control. In comparison with the traditional linear extended state observer (LESO), the differential state variable of the output voltage is utilized to increase the observation bandwidth; consequently, the proposed ILESO can effectively overcome the disadvantage of phase lag when tracking disturbances. Additionally, a proportional resonance controller is incorporated into the LESO feedforward channel to suppress voltage harmonics. The proposed scheme enhances the disturbance observation bandwidth compared to traditional strategies, resulting in a substantial improvement in both the disturbance observation capability of LADRC and the harmonic suppression ability of the VSG system. Theoretical analysis and simulations are conducted to validate the effectiveness of the proposed PR‐LADRC approach.

中文翻译：

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虚拟同步发电机自抗扰控制谐波抑制

摘要虚拟同步发电机 (VSG) 由外部功率环路和内部级联控制环路组成。当微电网负载表现出变化性和非线性时，输出接口的动态性能会严重下降。因此，任何电压控制方案都必须具备抵抗负载扰动的鲁棒性。本文提出了一种基于改进的线性扩展状态观测器（ILESO）的比例谐振线性自抗扰控制（PR-LADRC）方案，用于 VSG 电压控制。与传统的线性扩展状态观测器（LESO）相比，利用输出电压的微分状态变量来增加观测带宽；因此，所提出的ILESO可以有效克服跟踪干扰时相位滞后的缺点。此外，LESO 前馈通道中还集成了比例谐振控制器，以抑制电压谐波。与传统策略相比，该方案增强了扰动观测带宽，使得LADRC的扰动观测能力和VSG系统的谐波抑制能力均得到大幅提高。进行理论分析和模拟以验证所提出的 PR-LADRC 方法的有效性。