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An Approach to Eliminating DC Magnetic Flux From the Series Transformer of a Dynamic Voltage Restorer

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3 Author(s)
Jimichi, T. ; Dept. of Electr. & Electron. Eng., Tokyo Inst. of Technol., Tokyo ; Fujita, H. ; Akagi, H.

This paper proposes a control method for eliminating dc magnetic flux from the series transformer of a dynamic voltage restorer. The method is characterized by intentionally injecting no compensating voltage during a one-sixth line cycle (=3.3 ms at 50 Hz). The control method is independent of an initial phase angle of a voltage sag, thus requiring no flux detection. The period, during which no compensating voltage is injected, is one-third as short as that of an existing method. This paper confirms the effectiveness and viability of the proposed method. A 200-V 5-kW laboratory system verifies experimentally that the proposed method brings no dc magnetic flux to the series transformer. Moreover, the proposed method brings a smaller dc voltage drop to the dc load of a three-phase diode rectifier than the existing method does in the same conditions.

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Industry Applications, IEEE Transactions on  (Volume:44 ,  Issue: 3 )