To make the distributed generation provide better support for microgrid, the idea of virtual synchronous generator (VSG) is proposed. Typically, the VSG consists of the outer power loop and the inner cascaded voltage and current control loops. Due to the three-loop cascaded structure, a voltage loop with higher bandwidth is significant for ensuring good power control performance. Moreover, most loads in the microgrid are variable and nonlinear. So the voltage control scheme must possess strong robustness against load disturbance. A linear active disturbance rejection control (LADRC) scheme based on the improved error feedback control law (IEFCL) is proposed for VSG voltage control. Compared with the traditional EFCL, the proposed IEFCL can effectively improve the gain and compensate phase lag in the mid-frequency, thereby increasing the bandwidth of the LADRC based voltage loop. Quantitative analysis demonstrates the proposed scheme can achieve highly decoupled voltage control in $ dq$ frame. In comparison with the traditional strategies, the proposed scheme has higher bandwidth and can significantly improve the power control dynamics for VSG in parallel operation. Additionally, it possesses a good capability of harmonic mitigation and strong robustness against load disturbance. Simulations and experiments verify the effectiveness of the proposed scheme.

中文翻译：

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基于自抗扰控制的虚拟同步发电机控制策略

为了使分布式发电为微电网提供更好的支持，提出了虚拟同步发电机（VSG）的思想。通常，VSG 由外部功率回路和内部级联电压和电流控制回路组成。由于采用三环级联结构，具有更高带宽的电压环对于确保良好的功率控制性能具有重要意义。此外，微电网中的大多数负载都是可变的和非线性的。因此电压控制方案必须对负载扰动具有很强的鲁棒性。针对 VSG 电压控制，提出了一种基于改进误差反馈控制律 (IEFCL) 的线性自抗扰控制 (LADRC) 方案。与传统的 EFCL 相比，所提出的 IEFCL 可以有效提高增益并补偿中频相位滞后，从而增加基于 LADRC 的电压环路的带宽。定量分析表明，所提出的方案可以在$ dq$ 框架内实现高度解耦的电压控制。与传统策略相比，所提出的方案具有更高的带宽，并且可以显着改善并行运行中 VSG 的功率控制动态。此外，它还具有良好的谐波抑制能力和对负载扰动的强鲁棒性。仿真和实验验证了所提出方案的有效性。所提出的方案具有更高的带宽，并且可以显着改善并联运行中 VSG 的功率控制动态。此外，它还具有良好的谐波抑制能力和对负载扰动的强鲁棒性。仿真和实验验证了所提出方案的有效性。所提出的方案具有更高的带宽，并且可以显着改善并联运行中 VSG 的功率控制动态。此外，它还具有良好的谐波抑制能力和对负载扰动的强鲁棒性。仿真和实验验证了所提出方案的有效性。