An enhanced method for contribution assessment of utility and customer harmonic distortions in radial and weakly meshed distribution systems

Farhoodnea, Masoud; Mohamed, Azah; Shareef, Hussain; Zayandehroodi, Hadi

doi:10.1016/j.ijepes.2012.05.013

Cited by 33 publications

(21 citation statements)

References 20 publications

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“…This is much more relevant in rural facilities with radial distribution systems and with automatic disconnection of the inverter from the grid due to overvoltage beyond the technical established limit (253 V). The latter is considered to be a serious PQ problem in PV systems, which may occur due to the use of power inverters, and causes decreases in the reliability of power systems [39].…”

Section: Procedures Analysis and Methodologiesmentioning

confidence: 99%

Impact of Rural Grid-Connected Photovoltaic Generation Systems on Power Quality

et al. 2016

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Photovoltaic (PV) generation systems have been increasingly used to generate electricity from renewable sources, attracting a growing interest. Recently, grid connected PV micro-generation facilities in individual homes have increased due to governmental policies as well as greater attention by industry. As low voltage (LV) distribution systems were built to make energy flow in one direction, the power feed-in of PV generation in rural low-voltage grids can influence power quality (PQ) as well as facility operation and reliability. This paper presents results on PQ analysis of a real PV generation facility connected to a rural low-voltage grid. Voltage fluctuations and voltage harmonic contents were observed. Statistical analysis shows a negative impact on PQ produced by this PV facility and also that only a small fraction of the energy available during a sunny day is converted, provoking losses of revenue and forcing the converter to work in an undesirable operating mode. We discuss the disturbances imposed upon the grid and their outcome regarding technical and economic viability of the PV system, as well as possible solutions. A low-voltage grid strengthening has been suggested and implemented. After that a new PQ analysis shows an improvement in the impact upon PQ, making this facility economically viable.

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Section: Procedures Analysis and Methodologiesmentioning

confidence: 99%

Impact of Rural Grid-Connected Photovoltaic Generation Systems on Power Quality

et al. 2016

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“…The earliest technique to localize the harmonic sources is utilizing power direction technique, however, this method cannot give accurate results when some harmonics and phase angle beyond 90° [9], [10]. Moreover, a state estimation method is introduced with the implementation of least square and Kirchhoff current law [11].…”

Section: Introductionmentioning

confidence: 99%

An Improved of Multiple Harmonic Sources Identification in Distribution System with Inverter Loads by Using Spectrogram

Jopri

Abdullah

Manap

et al. 2016

IJPEDS

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This paper introduces an improved of multiple harmonic sources identification that been produced by inverter loads in power system using time-frequency distribution (TFD) analysis which is spectrogram. The spectrogram is a very applicable method to represent signals in time-frequency representation (TFR) and the main advantages of spectrogram are the accuracy, speed of the algorithm and use low memory size such that it can be computed rapidly. The identification of multiple harmonic sources is based on the significant relationship of spectral impedances which are the fundamental impedance (Z1) and harmonic impedance (Zh) that extracted from TFR. To verify the accuracy of the proposed method, MATLAB simulations carried out several unique cases with different harmonic producing loads on IEEE 4-bus test feeder cases. It is proven that the proposed method is superior with 100% correct identification of multiple harmonic sources. It is envisioned that the method is very accurate, fast and cost efficient to localize harmonic sources in distribution system.

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“…Electric power systems that are growing in size and complexities are always exposed to the various types of component failures [1]. To decrease the failure time and minimize the damages, the faulty element or possibly faulty region should be detected and disconnected from the rest of the system as fast and accurate as possible [2].…”

Section: Introductionmentioning

confidence: 99%