Zero-sequence fault transmission suppression method for medium-voltage flexible looped network controller of uncoupled transformer
The invention discloses a zero-sequence fault transmission suppression method for a medium-voltage flexible looped network controller of a coupling-free transformer, two ends of a power grid of MMC topology at two ends of the controller are connected by adopting back-to-back flexible direct current...
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| creator | YUAN TAO MEI CHONG LI CHUNYANG NA RISHA DENG TIANBAI TAO JUN |
| description | The invention discloses a zero-sequence fault transmission suppression method for a medium-voltage flexible looped network controller of a coupling-free transformer, two ends of a power grid of MMC topology at two ends of the controller are connected by adopting back-to-back flexible direct current converter stations, each phase of the converter stations at the two ends is connected in series with 2N half-bridge sub-modules, the voltage is equalized, and the direct current side is connected in series with a coupling inductance coil. A full-bridge sub-module is prevented from being adopted, a series compensation circuit is arranged on the direct-current side, and the direct-current side is connected through a coupling inductor, so that voltage fluctuation of the direct-current side during a fault is restrained, and transmission of a zero-sequence component of the alternating-current side is prevented. According to the topological structure, the occupied area is reduced, the loss is reduced, the economical effi |
| format | Patent |
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A full-bridge sub-module is prevented from being adopted, a series compensation circuit is arranged on the direct-current side, and the direct-current side is connected through a coupling inductor, so that voltage fluctuation of the direct-current side during a fault is restrained, and transmission of a zero-sequence component of the alternating-current side is prevented. 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| language | chi ; eng |
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| subjects | APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS GENERATION SYSTEMS FOR STORING ELECTRIC ENERGY |
| title | Zero-sequence fault transmission suppression method for medium-voltage flexible looped network controller of uncoupled transformer |
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