Measured Admittance Model for Dynamic Simulation of Inverter-Based Resources Using Numerical Laplace Transform

Miao Zhang, L. Bao, Zhixin Miao, Lingling Fan, P. Gómez
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引用次数: 1

Abstract

With confidentiality constraints of detailed control information of inverter-based resources (IBR), black-box models, e.g., admittance/impedance models, obtained from measurements are often used for stability analysis. This paper makes a further inquiry: If stability analysis is possible with admittance models, is it possible to produce time-domain simulation results with admittance models only? One method adopted in the literature is to create a linear state-space model for the entire system by interconnecting components. The requirement for such an approach is that each component's model should be proper. To relax this requirement, the current paper seeks an alternate approach: direct conversion of frequency-domain data to time-domain data via numerical Laplace transform (NLT). To begin with, this paper presents NLT's advantage over inverse fast Fourier transfer (IFFT) using tutorial examples. This is followed by an example of a type-4 wind farm weak grid operation stability analysis and fast simulation using admittance models obtained from measurements. It can be seen that frequency-domain measurements, along with data fitting and NLT, lead to not only stability analysis but also fast time-domain simulation for stability demonstration.
基于数值拉普拉斯变换的逆变器资源动态仿真测量导纳模型
由于基于逆变器的资源(IBR)的详细控制信息的机密性约束,从测量中获得的黑箱模型,例如导纳/阻抗模型,通常用于稳定性分析。本文进一步探讨:如果用导纳模型可以进行稳定性分析,那么是否可以仅用导纳模型得出时域仿真结果?文献中采用的一种方法是通过将组件互连,为整个系统创建线性状态空间模型。这种方法的要求是每个组件的模型都应该是合适的。为了放宽这一要求,本文寻求一种替代方法:通过数值拉普拉斯变换(NLT)将频域数据直接转换为时域数据。首先,本文使用教程示例介绍了NLT相对于逆快速傅里叶转移(IFFT)的优势。本文以某4型风电场弱电网运行稳定性分析为例,利用测量所得导纳模型进行了快速仿真。可以看出,频域测量以及数据拟合和NLT不仅可以进行稳定性分析,还可以进行快速的时域模拟以进行稳定性论证。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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