Grid Reduction Method Considering Electromagnetic Loop and Local Accommodation Effect for the Dynamic Equivalent

Yuqiang Hou, Yongiie Fang, Fusuo Liu, Jianbing Xu, Wei Li
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引用次数: 1

Abstract

Keeping the invariability of power flow and dynamic characteristics of generators rotor angles before and after the equivalent is an essential evaluation indicator for dynamic equivalence, which is necessary to electromagnetic transient modeling and simulation. A novel dynamic equivalent method is proposed for large-scale power systems electromagnetic transient modeling, which could reflect the characteristics of power alternation via electromagnetic loop and local accommodation among generators and loads in the equivalent network. The key method is to determine an equivalent bus for each node located in the equivalent section firstly, calculate the equivalent bus voltage(magnitude and phase) as well as the impedance of the equivalent tie branch follow the principle of unchanged of power flow and total current of the boundary transmission sections based on the initial operation point of the original power grids, then compute the effective sending power ability of equivalent coherent generators, and the effective receiving power ability for each equivalent bus. The effective load is summed finally for every equivalent bus. The real power system cases equivalent results demonstrate the accuracy and effectiveness of the method.
考虑电磁环和局部调节效应的动态等效网格化简方法
保持等效前后潮流的不变性和发电机转子角度的动态特性是动态等效的重要评价指标,是电磁暂态建模与仿真的必要条件。提出了一种新的大型电力系统电磁暂态建模的动态等效方法,该方法可以通过电磁回路和等效网络中发电机和负荷之间的局部调节来反映电力交替特性。其关键方法是首先为位于等效区段内的每个节点确定一条等效母线,根据原电网的初始工作点,按照边界传输区段潮流和总电流不变的原则,计算等效母线电压(幅值和相位)以及等效支路阻抗,然后计算等效相干发电机的有效发功率能力。以及各等效母线的有效接收功率能力。最后对每个等效母线的有效载荷求和。实际电力系统算例的等效结果验证了该方法的准确性和有效性。
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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