An Equipment for Protecting a Photovoltaic Generation System Connected to a Grid

Ichinose, Takasi; Asami, Takashi; Kimura, Takayuki

doi:10.1541/ieejpes1990.114.7-8_715

Cited by 3 publications

(2 citation statements)

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“…Several methods are used in equipment that detects islanding operation, including a method that uses as a detection threshold the variations in the harmonic voltage induced by the magnetic characteristics of pole transformers when there are virtually no changes in frequency or voltage during islanding operation. One such method detects sudden increases in the third harmonic voltage distortion (passive method) , and another is a frequency feedback method with step reative power injection developed for use in a cluster system (active method) . However, the detection threshold for changes in the harmonic voltage has often been set to +1% to +3% of the reference voltage, and there is not a sufficiently clear basis to generalize the detection threshold.…”

Section: Introductionmentioning

confidence: 99%

Estimation of Magnetizing Characteristics of Pole Transformers in Islanding Area

Yoshid

Suzuki

Fujiwara

et al. 2014

Electrical Engineering Japan

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SUMMARY For the detection of islanding, it is very important to choose the threshold value for the change in the harmonic voltage. In this paper, we propose an analytical model of a pole transformer using a Fourier series and clarify the nonlinear magnetizing characteristics of the pole transformer in an islanding area. After determining the proposed model coefficients from the tests of the pole transformer excited by a sinusoidal voltage, distorted wave voltage tests were performed under conditions in which the third harmonic voltage or the fifth harmonic voltage was superimposed. The results of the testing showed that the magnetic properties vary greatly upon increasing the harmonic component of the voltage. The analytical and measurement results were in good agreement. By using the proposed method, the distributed generators (DGs) can estimate the magnetizing characteristics of the pole transformer by monitoring the connected terminal voltage. Thus, as an active signal for islanding detection, DGs can inject a harmonic current synchronized to the excitation current harmonics of the pole transformer into the distribution network. In the case of DGs equipped with the above functions, there is no need to change the settings of the islanding detection threshold for changes in the harmonic voltage even when there is a change in the excitation voltage or an increase in the number of DGs.

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Section: Introductionmentioning

confidence: 99%

Estimation of Magnetizing Characteristics of Pole Transformers in Islanding Area

Yoshid

Suzuki

Fujiwara

et al. 2014

Electrical Engineering Japan

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“…Islanding detection methods for photovoltaics were developed [3] and have also been developed for distributed synchronous generators [46]. However, the conventional islanding detection methods for distributed synchronous generators have some problems.…”

Section: Introductionmentioning

confidence: 99%

Equivalent transformation technique for islanding detection methods of synchronous generators: Reactive power perturbation methods using AVR or SVC

et al. 2000

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Estimation of Magnetizing Characteristics of Pole Transformer in Islanding Area

et al. 2012

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For the detection of islanding, it is very important to choose the threshold value of harmonic voltage change. In this paper, we propose an analytical model of the pole transformer using a Fourier series, and will clarify the nonlinear magnetizing characteristics of the pole transformer in islanding area. After determining the proposed model coefficients from the tests of the pole transformer excited by sinusoidal voltage, the distorted wave voltage tests were performed under the condition that the third harmonic voltage or the fifth harmonic voltage was superimposed. The results of the testing showed that the magnetic properties vary greatly upon increasing the harmonic component of the voltage. The analysis and measurement results were in good agreement. By using the proposed method, the distributed generators (DGs) can estimate the magnetizing characteristics of the pole transformer by monitoring the connected terminal voltage. So, as the active signal for islanding detection, DGs can inject the harmonic current synchronized to exciting current harmonics of the pole transformer into the distribution network. In the case of the DGs equipped with the above functions, there is no need to change the settings about the islanding detection threshold of harmonic voltage change, even when there is an excitation voltage change or an increase in the number of DGs.

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An Equipment for Protecting a Photovoltaic Generation System Connected to a Grid

Cited by 3 publications

References 0 publications

Estimation of Magnetizing Characteristics of Pole Transformers in Islanding Area

Estimation of Magnetizing Characteristics of Pole Transformers in Islanding Area

Equivalent transformation technique for islanding detection methods of synchronous generators: Reactive power perturbation methods using AVR or SVC

Estimation of Magnetizing Characteristics of Pole Transformer in Islanding Area

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