Thévenin Equivalent Impedance Estimation for Power Electronic Devices in Smart Grids

T. Premgamone, E. Ortjohann, J. Kortenbruck, D. Holtschulte, A. Schmelter, S. Varada
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引用次数: 3

Abstract

Distributed generation (DG) based on renewable energy sources (RESs) as well as electric mobility and battery storage are currently penetrating electrical energy networks, especially at medium voltage (MV) and low voltage (LV) levels. The energy conversion is mostly based on power electronic devices. The control stability of these power converters is becoming increasingly important as more and more converters are being established in the grids, transforming the grid dynamic response. The Thévenin equivalent (TE) impedance at the point where a converter is connected can be used to represent the grid response seen from the converter. Therefore, an accurate TE parameter estimation is a key enabling feature for high control stability and performance enhancement in smart grids. An analysis of the main sources of TE estimation errors is given in this paper. Focusing on its core mathematical calculation, a new TE estimation algorithm based on least squares fitting for non-linear systems is presented. Simulation results show higher accuracy than a classical linear calculation method, especially at a high degree of measurement errors and reference frame shifts. More accurate TE impedance results can be beneficial for controller optimization of power converters, which will subsequently contribute to the stability of the future power supply systems with high integration of RESs as a whole.
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智能电网中电力电子器件的等效阻抗估计
基于可再生能源(RESs)的分布式发电(DG)以及电力移动和电池存储目前正在渗透到电力网络中,特别是在中压(MV)和低压(LV)水平。能量转换多以电力电子器件为基础。随着越来越多的变流器被安装到电网中,改变着电网的动态响应,变流器的控制稳定性变得越来越重要。转换器连接处的thsamvenin等效(TE)阻抗可以用来表示从转换器看到的电网响应。因此,准确的TE参数估计是智能电网高控制稳定性和性能增强的关键功能。本文分析了估计误差的主要来源。针对其核心数学计算,提出了一种基于最小二乘拟合的非线性系统TE估计算法。仿真结果表明,在测量误差较大和参考帧偏移较大的情况下,该方法比传统的线性计算方法具有更高的精度。更精确的TE阻抗结果有利于功率转换器的控制器优化,从而有助于未来RESs整体集成度高的供电系统的稳定性。
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