Unbalance and harmonic distortion assessment in an experimental distribution network

Martín, Aránzazu D.; Herrera, Reyes S.; Vázquez, Jesús R.; Crolla, Paul; Burt, Graeme

doi:10.1016/j.epsr.2015.06.005

Cited by 10 publications

(2 citation statements)

References 25 publications

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“…Because the vibration waveform is periodic, by Fourier transform, the vibration waveform can be converted into sinusoidal frequency components. 28–30 Harmonic of the vibration waveform is a frequency component with the frequency, which is an integer multiple of the vibration frequency (fundamental frequency). Thus, the vibration waveform can be expressed as where c 0 is the relative offset, m is the order of harmonics.…”

Section: Orifice Shape Designmentioning

confidence: 99%

Analytical solution to orifice design in a rotary valve controlled electro-hydraulic vibration exciter for high-frequency sinusoidal vibration waveform

Wang

Quan

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part E:

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The present study is focused on a novel method for the acquisition of high-frequency sinusoidal vibration waveform with electro-hydraulic vibration exciter. A rotary valve controlled electro-hydraulic vibration exciter is proposed to make it easier to obtain high vibration frequency than the conventional servo valve controlled counterpart. Three common used offices are taken into consideration: rectangular orifice, triangular orifice, and semicircular orifice. Analytical solution to orifice design of shape and axial length is suggested for the accurate control of vibration waveform. Harmonic theory borrowed from electronic technology is used as an evaluation index for the shape of vibration waveform. The orifice shape design decision is made according to the total harmonic distortion of vibration waveform. The nonlinear differential equation which models vibration waveform is established. The orifice axial length is designed according to the supply pressure, vibration frequency, and amplitude. Both theoretical and experimental results show that rectangular orifice is desirable for high-frequency sinusoidal vibration waveforms. With the orifice design solution, the proposed vibration exciter can output the vibration waveform with total harmonic distortion of less than 1% as compared with sinusoidal waveform and maximum error of 5% as compared with experimental value at vibration frequency of higher than 100 Hz, and greatly extend the frequency bandwidth when sinusoidal vibration waveform is required.

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Section: Orifice Shape Designmentioning

confidence: 99%

Analytical solution to orifice design in a rotary valve controlled electro-hydraulic vibration exciter for high-frequency sinusoidal vibration waveform

Wang

Quan

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…This current produces a negative torque that reduces the effective torque and causes speed disturbance . Several standards and publications defined indices to quantify and asses the unbalance conditions such as line voltage unbalance ratio (LVUR) and unbalance current ratio (UCR) . Another commonly used and recommended index defined by the International Electrotechnical Commission (IEC) is the voltage unbalance factor (VUF), and it should not exceed 3% …”

Section: Introductionmentioning

confidence: 99%

Enhancing the response of thyristor‐controlled reactor using neural network

Ragab

Ghaeb

Al‐Naimi

2019

Int Trans Electr Energ Syst

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Summary In this paper, a neural network controller is proposed to retrieve the voltage balancing conditions in three‐phase power systems. The neural network is suggested to calculate the required set of firing angles for the thyristor‐controlled reactor accurately to balance the three‐load voltages quickly. The proposed controller is fed by different parameters within different feeding techniques, namely, root mean square (RMS) values of the three load voltages, RMS value of the space vector signal calculated from the three load voltages, and the RMS values of both the three load voltages and their associated space vector. The intentions of the proposed techniques are to combine between reducing the number of measured parameters and providing the controller with qualitative data about system status. The influence of the measured parameters on the neural network performance is examined by calculating the regression coefficients through several test cases. Accordingly, only the effective parameters are utilized to reduce the neural network complexity and to enhance the controller response time. Additionally, the calculations of the controller input parameters are made in terms of space vector cycle, which is half of system sinusoidal cycle. Consequently, the calculation time is reduced significantly. The Aqaba‐Qatrana‐South Amman power system is considered and modeled as a real case study. In addition, several test cases have been conducted to test and validate the ability of the proposed neural network controller in retrieving the voltage balance conditions precisely and quickly. The results have revealed the ability of the proposed neural network controller to calculate the firing angles quickly within 10 milliseconds and achieve very low voltage unbalance factor.

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Integration of PV and EVs in unbalanced residential LV networks and implications for the smart grid and advanced metering infrastructure deployment

Rodriguez-Calvo

Cossent

Frías

2017

International Journal of Electrical Power & Energy Systems

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Unbalance and harmonic distortion assessment in an experimental distribution network

Cited by 10 publications

References 25 publications

Analytical solution to orifice design in a rotary valve controlled electro-hydraulic vibration exciter for high-frequency sinusoidal vibration waveform

Analytical solution to orifice design in a rotary valve controlled electro-hydraulic vibration exciter for high-frequency sinusoidal vibration waveform

Enhancing the response of thyristor‐controlled reactor using neural network

Integration of PV and EVs in unbalanced residential LV networks and implications for the smart grid and advanced metering infrastructure deployment

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