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首页> 外文期刊>Emerging and Selected Topics in Power Electronics, IEEE Journal of >Wideband dq-Frame Impedance Modeling of Load-Side Virtual Synchronous Machine and Its Stability Analysis in Comparison With Conventional PWM Rectifier in Weak Grid
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Wideband dq-Frame Impedance Modeling of Load-Side Virtual Synchronous Machine and Its Stability Analysis in Comparison With Conventional PWM Rectifier in Weak Grid

机译：负载侧虚拟同步机的宽带DQ帧阻抗建模及其稳定性分析与弱电网传统PWM整流器相比

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摘要

The load-side virtual synchronous machine (LVSM) enables the load to actively participate in the grid regulation, but it might still induce oscillations in a weak grid. Considering the dc-link voltage controller, power loops, ac voltage and current loops, the control delay, and sampling filters, the wideband dq-frame impedance model of the LVSM is first established, and it is found that Z(dd) exhibits negative resistor impedance within 10 Hz. In addition, the dq-frame impedance of the LVSM is approximately inductive above 10 Hz. Then, using the dq-frame impedance-based approach, the comparative study shows that the smaller the proportional gain and integral gain of the dc-link voltage controller are, the more stable the conventional voltage source rectifier (VSR) is in a weak grid. However, the larger the proportional gain is, the smaller the integral gain is, the more stable the LVSM is in a weak grid. Furthermore, the voltage feedforward decreases the stability margin of the VSR in a weak grid, while the virtual moment of inertia J and the damping gain D-p affect the stability of the LVSM, and the smaller J and D-p are, the more stable the LVSM is in weak grid. Finally, simulations and experimental results verify the impedance model and the stability analysis.
机译：负载侧虚拟同步机（LVSM）使负载能够主动参与网格调节，但它仍然可能诱导弱网格中的振荡。考虑到DC-Link电压控制器，电源环，交流电压和电流回路，控制延迟和采样滤波器，首先建立LVSM的宽带DQ帧阻抗模型，发现Z（DD）呈现负数10 Hz内的电阻阻抗。另外，LVSM的DQ帧阻抗近似电感高于10Hz。然后，使用基于DQ帧阻抗的方法，比较研究表明，DC-Link电压控制器的比例增益和积分增益越小，传统电压源整流器（VSR）越稳定为弱网格。然而，比例增益越大，积分增益越小，LVSM在弱网格中越稳定。此外，电压前馈在弱网格中降低了VSR的稳定性边缘，而惯性J和阻尼增益DP的虚拟时刻会影响LVSM的稳定性，并且较小的J和DP是LVSM的越稳定越稳定在弱网格。最后，仿真和实验结果验证了阻抗模型和稳定性分析。

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