Abstract
Dividing the responsibility of harmonics between customer and utility sides is necessary to improve the objectivity, rationality, and scientificalness of power measurement and power quality evaluation. On the basis of expert experience and customer needs and considering the background harmonic fluctuation, this study proposes two reasonable conditions to evaluate harmonic responsibility. At the same time, the reference index of harmonic responsibility calculation and the problem of different frequency harmonics are considered in the comprehensive calculation. On the basis of the IEEE Std. 1459–2010 power theory, the index set of harmonic responsibility is established, and several common subjective and objective weighting methods are used to weigh each index. On the basis of optimization theory, an optimization model is established by constructing a Lagrange function in finding the condition extremum to unify the subjective and objective information. Finally, the calculation method is verified by a Norton equivalent model, and the harmonic responsibility of each index is calculated by the harmonic current vector method; thus, calculating the actual impedance of customer and utility sides is unnecessary, making the calculation simple and effective. Results of the comparative analysis show that the comprehensive evaluation method of harmonic responsibility with the combinatorial weighting method can not only meet the different needs of different groups for harmonic indicators but also reflect the background harmonic fluctuations sensitively. In this manner, the subjective and objective information are unified, and the shortcomings of a single weighting method are overcome. Hence, the evaluation results are accurate, practical, and reasonable.
Highlights
With the rapid development of power electronics and nonlinear loads, harmonics in power systems have gradually become serious, thereby attracting increasing scientific research attention.First, the harmonics have been analyzed in detail [1]
On the basis of the actual situation, this study presents two reasonable judgment conditions for the comprehensive calculation method of the harmonic responsibility based on different weighting methods, establishes the indicator set of harmonic responsibility based on IEEE Std. 1459–2010 power theory, and selects several commonly used subjective and objective weighting methods
This study considers the contradiction between the results of harmonic responsibility caused by different traditional indexes and the harmonics of different frequency harmonics
Summary
With the rapid development of power electronics and nonlinear loads, harmonics in power systems have gradually become serious, thereby attracting increasing scientific research attention. With the development of the subject, researchers have proposed several positioning methods of the main harmonic source [2,3,4]; these methods only locate the main harmonic source, but they cannot calculate the harmonic responsibility of each harmonic source quantitatively. Reference [5] first proposed the calculation of harmonic responsibility in. With the development of this topic, many researchers begin to focus on modeling approach of utility side and customer side [6,7,8], Energies 2019, 12, 4449; doi:10.3390/en12234449 www.mdpi.com/journal/energies. Energies 2019, 12, x FOR PEER REVIEW calculation method of parameters of modeling [9], and so on.
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