Extended Frequency Divider for Bus Frequency Estimation Considering Virtual Inertia from DFIGs

Bendong Tan, Junbo Zhao, F. Milano, Qiupin Lai, Y. Zhang, D. Maldonado
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引用次数: 2

Abstract

Accurate estimation of local bus frequency is important for effectively controlling both synchronous and nonsynchronous generators. As the power grid evolves to accommodate essential reliability services such as virtual inertia from nonsynchronous generators, conventional techniques to estimate frequency face challenges. This paper proposes a new frequency estimation method that can effectively include the inertia contributions from double-fed wind generators (DFIGs). This is achieved through the proposed extended frequency divider formula (FDF) to include the contributions of DFIGs via Thevenin equivalents. The proposed extended FDF does not suffer from numerical issues as compared to existing phasor angle derivative-based approaches. Moreover, the knowledge of the rotor speeds of the synchronous machine and DFIGs as well as of the network admittance matrix allows estimating the frequencies of all buses in the grid, thereby significantly improving system situational awareness with a limited number of measurements. Numerical results on the IEEE 39-bus power system with DFIGs show that the proposed method achieves more accurate bus frequency estimations than the original FDF formula and other approaches based on the numerical derivation of the bus voltage phase angles.
考虑dfig虚惯量的母线频率估计扩展分频器
本地母线频率的准确估计对于有效控制同步和非同步发电机具有重要意义。随着电网的发展,以适应必要的可靠性服务,如来自非同步发电机的虚拟惯性,传统的频率估计技术面临挑战。本文提出了一种新的频率估计方法,该方法可以有效地考虑双馈风力发电机的惯性贡献。这是通过提出的扩展分频公式(FDF)来实现的,该公式通过Thevenin等价物包括DFIGs的贡献。与现有的基于相角导数的方法相比,拟议的扩展FDF不存在数值问题。此外,同步电机和DFIGs的转子速度以及网络导纳矩阵的知识允许估计电网中所有总线的频率,从而通过有限数量的测量显着提高系统态势感知。基于DFIGs的IEEE 39总线电力系统的数值计算结果表明,该方法比原FDF公式和其他基于母线电压相角数值推导的方法获得了更精确的母线频率估计。
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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