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A new algorithm for calculating utility harmonic impedance

机译：一种新的计算实用谐波阻抗算法

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摘要

In engineering, it is very valuable to estimate the utility harmonic impedance of a point of common coupling (PCC). However, the existing methods usually assume that the customer harmonic impedance is much larger than the utility harmonic impedance, if not, the estimated accuracy is hard to meet engineering requirement. Unfortunately, in modern power grid, due to the influence of filters or reactive compensation capacitors installed on the customer side of a PCC, the above assumption is no longer valid. This paper proposes a new algorithm to overcome this problem, the proposed algorithm can get a fairly good estimated result while the amplitude of utility harmonic impedance is approximately equal to the customer harmonic impedance. In this algorithm, firstly, the amplitude of utility harmonic impedance is calculated by using the weak correlation of the fluctuation of the harmonic sources on both sides of a PCC, and the impedance angle can be obtained through minimizing background harmonic fluctuation energy. Simulation and field case verify the effectiveness.
机译：在工程中，估计公共耦合点（PCC）的实用谐波阻抗非常有价值。然而，现有方法通常假设客户谐波阻抗远大于公用事业谐波阻抗，如果不是，估计的精度是难以满足工程要求的。遗憾的是，在现代电网中，由于安装在PCC的客户端的过滤器或反应补偿电容的影响，上述假设不再有效。本文提出了一种克服这个问题的新算法，所提出的算法可以获得相当良好的估计结果，而公用事业谐波阻抗的幅度大致等于客户谐波阻抗。在该算法中，首先，通过使用PCC两侧的谐波源的波动的弱相关性来计算公用事业谐波阻抗的幅度，并且通过最小化背景谐波波动能量，可以获得阻抗角。仿真和现场案例验证了有效性。

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