Abstract
This paper presents a method for evaluating the harmonic contributions of multiple harmonic sources to voltage distortion at the point of common coupling (PCC). The proposed method quantitatively represents harmonic contributions based on the equivalent voltage models of harmonic sources. The equivalent voltage models can be estimated using the recursive least square (RLS) algorithm and measured voltage and current at the PCC. The assessment of harmonic contribution heavily depends on the accuracy of equivalent model estimation. Many existing studies have assumed that the equivalent model parameters of harmonic sources are not changed. However, because harmonic source parameters and system operating conditions are not constant in real power systems, this assumption can lead large errors in harmonic contribution assessment. In this paper, we propose a new assessment method based on variable forgetting factor RLS and parameter change detection to solve the problem. The proposed method is also effective for evaluating comprehensive harmonic contributions as well as individual harmonic contributions. The case studies show that the proposed method is superior to the previous one even under parameter changing conditions.
Highlights
As the use of nonlinear loads increases, various problems such as additional losses, equipment malfunctions and degradation arise due to harmonic distortion [1]–[3]
The assessment of harmonic distortion contribution is a technique for quantitatively evaluating the individual contribution of multiple harmonic sources to voltage distortion at the point of common coupling (PCC) [5]
We propose a new assessment method based on the variable forgetting factor recursive least square (RLS) and parameter change detection
Summary
As the use of nonlinear loads increases, various problems such as additional losses, equipment malfunctions and degradation arise due to harmonic distortion [1]–[3]. In [10] and [11], the harmonic current injection and switching capacitor methods were introduced These methods are experimental approaches based on changes in transient harmonic voltages and currents during intentional short-term disturbances. Park et al.: Novel Method for Assessing the Contribution of Harmonic Sources to Voltage Distortion in Power Systems. In non-experimental approaches, the harmonic contribution assessment basically requires the estimation of equivalent models of harmonic sources using measured voltages and currents at the PCC. Because the equivalent harmonic voltages and impedances cannot be measured directly, these equivalent parameters are estimated using measured data and the RLS method. An accurate parameter estimation for harmonic voltages and impedances is essential to assess harmonic contribution
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