Nonsinusoidal power caused by measurements of grid impedances at unbalanced grid voltages

T. Thanh, S. Schostan, K.-D. Dettmann, Detlef Schulz
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引用次数: 10

Abstract

At low-voltage level there is already a commercial measurement device that is able to identify the grid impedance in dependency of time and frequency. Since at the low-voltage level a four-wire system and at the medium-and high-voltage level a three-wire system is installed, the method to identify the grid impedance has to be varied. This paper proposes a method that could be applied for the identification of the time and frequency dependent grid impedance at the medium- and high-voltage level. Another aspect that has to be considered is how to dimension the variable switched resistive load, which is necessary to stimulate the grid. The power-range of this load is limited by the maximum allowable voltage drop in the grid. Furthermore it is important to investigate what kind of power terms are caused by the nonsinusoidal stimulation of the grid in balanced and unbalanced configurations. For this purpose the power theory of Fryze is applied.
在不平衡电网电压下测量电网阻抗所产生的非正弦功率
在低电压水平上,已经有一种商用测量装置能够识别与时间和频率相关的电网阻抗。由于在低压水平安装了四线制系统,在中高压水平安装了三线制系统,因此确定电网阻抗的方法必须有所不同。本文提出了一种可用于识别中、高压时频栅极阻抗的方法。另一个需要考虑的方面是如何确定可变开关电阻负载的尺寸,这是对电网进行激励所必需的。该负载的功率范围受电网中最大允许电压降的限制。此外,研究电网在平衡和不平衡状态下的非正弦刺激会产生什么样的功率项是很重要的。为此,应用了Fryze的功率理论。
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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