Determining Harmonic Contributions Based on Reweighted Complex Least Squares Method

2013 ◽  
Vol 448-453 ◽  
pp. 2660-2666
Author(s):  
Hui Chun Hua ◽  
Xiu Fang Jia ◽  
Hai Qing An ◽  
Shao Guang Zhang

Determining harmonic contribution quantitatively at the point of common coupling is an important task for power quality management. Outliers and influential points could have strong influences on regressors. This paper puts forward a method named reweighted complex least squares to eliminate or reduce the influences to ensure the robustness of the regression. The method can improve precision of the equivalent harmonic impedance and it can get a more reasonable result in harmonic contribution determination than previous methods. A case study based on the IEEE 14-bus test system was conducted, which shows the validity of the proposed method.

2022 ◽  
Vol 203 ◽  
pp. 107679
Author(s):  
Oscar Pinzón-Quintero ◽  
Daniel Gaviria-Ospina ◽  
Alejandro Parrado-Duque ◽  
Rusber Rodríguez-Velásquez ◽  
German Osma-Pinto

2014 ◽  
Vol 573 ◽  
pp. 716-721
Author(s):  
S. Rajeshbabu ◽  
B.V. Manikandan

Renewable energy sources provide the additional/satisfy the power to the consumer through power electronics interfaces and integrated with the grid. In grid integration power quality is one of the important parameter that need to be paying more attention. This proposed work focuses on power quality issues in a grid connected renewable energy system. Power quality issues will arises due to many factors here with the by introducing a fault condition in a grid connected renewable energy system the measurements were made at the point of common coupling and the mitigation is done with the help of a dynamic voltage restorer. The dynamic voltage restorer is a device which offers series compensation activated by neural network based controller. The sag improvement and the total harmonic assessment were made at the point of common coupling. Keywords: Neural network, Point of common coupling, Renewable energy source, Power quality, Dynamic voltage restorer ,electric grid.


2017 ◽  
pp. 12-19 ◽  
Author(s):  
Dmitrii V. DVORKIN ◽  
◽  
Maxim A. SILAYEV ◽  
Vladimir N. TUL’SKII ◽  
Stefan PALIS ◽  
...  

REGIONOLOGY ◽  
2019 ◽  
Vol 27 (4) ◽  
pp. 602-632 ◽  
Author(s):  
Ksenia Yu. Voloshenko ◽  
Tatiana E. Drok

Introduction. Development of countries, regions and individual ecosystems occurs in the paradigm of innovative and technological change, the crucial element being the production knowledge and competencies. Their ranging in terms of transforming the complexity of the products that the country exports has been embodied and developed in the approach of economic complexity. However, insufficient attention is paid to the study of economic complexity in the context of transboundary processes that impact the development of territories. The objective of this study is to measure the impact of the intensity of transboundary relations on the change in economic complexity through the case study of European countries using the indicators of transboundary specialization of foreign trade turnover. Materials and Methods. The study employed the methods of econometric analysis. Information from the UN Comtrade database, as well as from the special resources for analyzing the economic complexity of countries, the Atlas of Economic Complexity and the Observatory of Economic Complexity, was used as the source data for calculations and measurements. Results. European countries have been classified into 3 subpanels based on Gaussian mixture distributions. The intensity of the impact of the transboundary activities on the complexity of the economy has been identified employing the panel cointegration method based on the constructed models (the combined model and models with fixed and random effects), which were supplemented by data analysis using the fully modified least squares method and the dynamic least squares method. Long-term interdependence between economic complexity and the intensity of transboundary activities has been identified. Discussion and Conclusion. It has been established that the influence of the transboundary interaction factor weakens as the economic complexity increases and under certain conditions it has a negative impact. The revealed dependence is due to the increasing role of global processes rather than the transboundary ones as the economy becomes more complex and more oriented towards the global market. The research findings contribute to further development of the Theory of Economic Complexity; they significantly expand the practical scope of its application, play an important role in understanding and further research on the opportunities and limitations for the development of territories differing in the transboundary cooperation intensity.


Author(s):  
R. Kalpana ◽  
G. Bhuvaneswari ◽  
Bhim Singh ◽  
Shikha Singh ◽  
Sanjay Gairola

This paper presents a new 28-pulse ac-dc converter for enhancing the power quality at the point of common coupling, while feeding a medium capacity switched mode power supply (SMPS). It consists of two series connected 14-pulse ac-dc uncontrolled converters fed by seven phase-shifted ac voltages. The proposed converter is found capable of suppressing up to 27 harmonic currents in the ac mains. The power factor is also improved to near unity over a wide operating range of the SMPS. The design and analysis of the proposed ac-dc converter is carried-out in detail. A laboratory prototype of the autoconnected transformer based 28-pulse ac-dc converter is developed, and various tests have been conducted on it to validate the simulated performance of the proposed converter. Several experimental results are also included to show the effectiveness and robustness of the proposed converter.


2013 ◽  
Vol 448-453 ◽  
pp. 2380-2383
Author(s):  
Xiao Jun Zhu ◽  
Xiang Li ◽  
Bin Fu ◽  
Ang Fu ◽  
Min You Chen ◽  
...  

This paper presents a novel method for determining the harmonic emission responsibilities of utility and customer at the point of common coupling (PCC). The proposed approach is based on robust partial least squares regression (robust PLS), which estimates system harmonic impedance by utilizing the signals of harmonic voltage and current measured synchronously at PCC. Consequently the harmonic emission responsibilities are calculated. The presented method reduces or removes the effect of outlying data points. The simulation and the practical engineering results indicate that the proposed method is valid and feasible.


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