Patent ID: 11942873
Assignee: HITACHI MITSUBISHI HYDRO CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 9:
10. The secondary magnetic excitation generator-motor device according to claim 4, wherein a first DC voltage sensor and a first active DC voltage suppression circuit are connected in parallel to the first DC capacitor, the first active DC voltage suppression circuit connecting a resistance and a first self-arc-extinguishing semiconductor element in series, and a second DC voltage sensor and a second active DC voltage suppression circuit are connected in parallel to the second DC capacitor, the second active DC voltage suppression circuit connecting a resistance and a second self-arc-extinguishing semiconductor element in series, so as to execute on/off control on the first self-arc-extinguishing semiconductor element to reduce a DC voltage when a detection value of the first DC voltage sensor exceeds a set range, and so as to execute on/off control on the second self-arc-extinguishing semiconductor element to reduce a DC voltage when a detection value of the second DC voltage sensor exceeds a set range.