A Countermeasure against the Voltage Sag due to a Inrush Current of Wind Power Generation System Interconnecting to a Distribution Line

Sasaki, Yuji; Harada, Noriaki; Kai, Takaaki; Sato, Tatsunori

doi:10.1541/ieejpes1990.120.2_180

Cited by 29 publications

(15 citation statements)

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“…Thus, in the proposed method, first the flux density is found, and then the iron loss is calculated using the mass based on Eq. (9) in which the design calculations are used [5,6]. Then, in order to unify this result with the copper loss, the copper loss resistance value given by the equivalent circuit and identical to the iron loss obtained is found using a convergence calculation:…”

Section: (3) Copper Lossmentioning

confidence: 99%

“…By using this relationship, the flux density can be found from the inductive electromotive force obtained in the equivalent circuit, and the iron loss can be calculated by using Eq. (9). In other words, the flux density when the generator is at rated output is set, and this is used as the reference value B 0 (set for the teeth and continuous iron areas).…”

Section: (3) Copper Lossmentioning

confidence: 99%

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A calculation method of the total efficiency of wind generators

Inoue

Takahashi

Murata

et al. 2006

Electrical Engineering Japan

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SUMMARYThe spread of wind energy converters is progressing in recent years and its capacity is becoming larger and larger. In order to capture more energy from the wind, it is important to analyze loss characteristics of wind generators for the operating speed which is determined dependent on the wind speed. This paper presents a method to evaluate various losses in a wind generator as a function of wind speed, which is based on steady-state analysis and thus the calculations can be performed quickly. By using the proposed method, wind turbine power, generator output, various losses, and the total energy efficiency are calculated for three types of wind speed data which are represented by a Weibull function.

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Section: (3) Copper Lossmentioning

confidence: 99%

Section: (3) Copper Lossmentioning

confidence: 99%

A calculation method of the total efficiency of wind generators

Inoue

Takahashi

Murata

et al. 2006

Electrical Engineering Japan

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“…Generally, induction generators with squirrel-cage rotors are widely employed for wind generation applications because of their salient features such as robust rotor design, simple construction, maintenance-free operation, and the like. However, these induction generators draw large transient inrush currents that are several times the machine rated currents at the instant when they are connected to the utility grid [2,3] or whenever various disturbances occur [4,5]. Furthermore, the terminal voltage and power factor of induction generators vary with changes in wind velocity, and the voltage and power factor cannot be controlled in these generators.…”

Section: Introductionmentioning

confidence: 99%

“…Many papers on transient conditions in connection to the utility grid have appeared in the last few years [2,3]. However, only a few papers have considered the terminal voltage and power factor of induction generators.…”

Section: Introductionmentioning

confidence: 99%

Terminal voltage and power factor control of induction generators for wind power generation system

Senjyu

Sueyoshi

Kuninaka

et al. 2008

Electrical Engineering Japan

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SUMMARYThis paper deals with two types of control method for induction generators used in wind power generating stations. One is aimed at maintaining the voltage of the station node and the other is aimed at maintaining a constant power factor through the branch connecting to the station. Both can be in the controllable area by adjusting the generator reactive power with compensating capacitors. First, theoretical equations for the terminal voltage and power factor of an induction generator are derived, and then the compensating capacitance corresponding to the wind velocity variation is determined quantitatively. By using the proposed control method, it is shown to be possible to maintain the terminal voltage and operating power factor of a wind power generation system at the target values, even when abrupt deviations are caused by wind power disturbances.

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“…As a result, when connected to a power grid, there is a sudden inrush of current several times greater than the rated current, and a voltage drop in a distribution line occurs. Consequently, a method to control the inrush current using an AC power regulator in wind power generation in which connecting to and disconnecting from the power grid is done frequently depending on changes in wind conditions is widely used (soft start method) [1]. However, the AC power regulator generates harmonic current as a result of phase control in the thyristor when suppressing the inrush current.…”

Section: Introductionmentioning

confidence: 99%

Compensation for harmonic currents and reactive power in wind power generation system using PWM inverter

et al. 2006

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In recent years, awareness of environmental problems is growing, and the price of electric power purchased by electric companies has been expensive for power plants utilizing natural energy. Thus, the introduction of wind power generation is being promoted in Japan. Generally, squirrel‐cage induction machines are widely used as generators in wind power generation systems because of their small size, light weight, and low cost. However, the induction machines do not have a source of excitation. Thus, inrush currents and instantaneous voltage drops occur when the generator is directly connected to a power grid. To reduce the inrush currents, an AC power regulator is used. Wind power generators are frequently connected to and disconnected from the power grid. However, when the inrush currents are reduced, harmonic currents are caused by phase control of the AC power regulator. And the phase control of the AC power regulator cannot control the power factor. Therefore, we propose the use of the AC power regulator to compensate for the harmonic currents and reactive power in a wind power generation system, and demonstrate the validity of this system by simulated and experimental results. © 2005 Wiley Periodicals, Inc. Electr Eng Jpn, 154(2): 58–67, 2006; Published online in Wiley InterScience (http://www.interscience.wiley.com). DOI 10.1002/eej.20254

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A Countermeasure against the Voltage Sag due to a Inrush Current of Wind Power Generation System Interconnecting to a Distribution Line

Cited by 29 publications

References 0 publications

A calculation method of the total efficiency of wind generators

A calculation method of the total efficiency of wind generators

Terminal voltage and power factor control of induction generators for wind power generation system

Compensation for harmonic currents and reactive power in wind power generation system using PWM inverter

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