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Mitigation of harmonic disturbance at pumped storage power station with static frequency converter

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3 Author(s)
Jung-Chen Chiang ; Dept. of Electr. Eng., Nat. Taiwan Inst. of Technol., Taipei, Taiwan ; Chi-Jui Wu ; Shih-Shong Yen

This paper investigates the harmonic distortion problem and mitigation method at the Mingtan pumped storage power station in Taiwan, where six 300 MVA synchronous generator/motors are started by a static frequency converter (SFC) before the pumping stage. Since the SFC uses a 6-pulse rectifier technique, a large amount of harmonic currents are produced during the starting period. The harmonic distortion level at each bus of the power plant was very high. Especially, the total harmonic distortion (THD) of current at the lighting feeder reached up to 184%, so that power fuses were burned out. At first a 5 mH reactor was inserted in the SFC feeder and a 5th order and high pass filter was installed. However, the harmonic distortion levels were still too high, but there is no space for additional higher-order filters. Finally, the SFC is feeded with an individual transformer and the harmonic disturbance problem is avoided. This paper also gives computer simulations to investigate the harmonic distortion problems and verify the mitigation methods

Published in:

IEEE Transactions on Energy Conversion  (Volume:12 ,  Issue: 3 )