制定基于逆变器的资源的基于测量的小信号模型的复杂性
Intricacies of formulating measurement-based small signal models of inverter based resources
摘要：
随着现代电力系统中逆变器资源的日益增多，在稳定性研究中需要对逆变器资源进行精确建模。基于测量的建模方法可以创建IBR的阻抗/导纳模型，随后用于小信号稳定性研究。这种基于测量的方法以前已成功用于DC-DC转换器，但对三相IBR提出了独特的挑战。本文讨论的选择和挑战，可能会导致一个不正确的模型，以测量为基础的方法，以及缓解机制的不利影响，使用一个说明性的例子。还讨论了小信号稳定性评估涉及这样的导纳模型。通过所示的说明性示例可以看出，注入信号和模型拟合过程、用于测量设备的锁相环以及电网阻抗可以影响IBR的基于测量的导纳模型的准确性。
英文摘要：
The increasing number of inverter based resources (IBRs) connected to modern power systems necessitate accurate modeling of IBRs in stability studies. Measurement-based modeling approaches can create an impedance/admittance model of IBRs to be subsequently used in small signal stability studies. Such measurement-based approaches have previously been successfully used for dc-dc converters but present unique challenges for three-phase IBRs. This paper discusses the choices and challenges that can lead to an incorrect model from measurement-based approaches as well as mitigation mechanisms of the adverse impacts using an illustrative example. A discussion of small signal stability assessment involving such admittance models is also provided. It is seen through the illustrative example shown that the injection signal and the model fitting procedure, the phase locked loop used for the measurement device, and the grid impedance may impact the accuracy of the measurement-based admittance model of the IBRs.
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