Evaluation of Virtual Synchronous Machines With Dynamic or Quasi-Stationary Machine Models
Evaluation of Virtual Synchronous Machines With Dynamic or Quasi-Stationary Machine Models
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DOI：
10.1109/tie.2016.2638810
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发表时间：
2017-07
影响因子：
7.7
通讯作者：
O. Mo;S. D'arco;J. Suul
中科院分区：
文献类型：
--
作者：
O. Mo;S. D'arco;J. Suul
本文将虚拟同步机的小信号稳定性特性与内部同步机模型的动态表示和准平稳表示进行了比较。结果表明，当采用实际的定子阻抗值时，动态电方程可能会导致低阻尼振荡。准平稳实现对虚拟机模型的阻抗不太敏感，但依赖于对交流侧电压的测量d轴和q轴分量进行滤波，以避免不稳定或阻尼差的振荡。演示了如何使这两种实现在广泛的网格阻抗范围内保持稳定和健壮。然而，动态电模型依赖于一个高虚电阻来有效地抑制瞬态交流电流中与直流分量相关的内部振荡。因此，当使用具有低虚定子电阻的SM参数解耦有功和无功控制时，准平稳VSM实现更可取。
This paper presents a comparison of the small-signal stability properties for virtual synchronous machines (VSMs) with dynamic and quasi-stationary representation of the internal synchronous machine (SM) model. It is shown that the dynamic electrical equations may introduce poorly damped oscillations when realistic stator impedance values for high-power SMs are used. The quasi-stationary implementation is less sensitive to the impedance of the virtual machine model, but depends on filtering of the measured d- and q-axes components of the ac-side voltage to avoid instability or poorly damped oscillations. It is demonstrated how both implementations can be made stable and robust for a wide range of grid impedances. However, the dynamic electrical model depends on a high virtual resistance for effectively damping internal oscillations associated with dc components in the ac currents during transients. Thus, when using SM parameters with low virtual stator resistance for decoupling the active and reactive power control, the quasi-stationary VSM implementation is preferable.