High-voltage dc transformation apparatus and power system and control method thereof

A power system, comprising:

• at least one high-voltage DC power generator;
• and
• a high-voltage DC transformation apparatus, electrically connected to the at least one high-voltage DC power generator, comprising:
• at least one bidirectional AC/DC conversion module, wherein a DC terminal of the bidirectional AC/DC conversion module is electrically connected to the corresponding high-voltage DC power generator;
• at least one first transformer each of that comprises a first transmission terminal and a second transmission terminal, wherein the first transmission terminal is electrically connected to an AC terminal of the corresponding bidirectional AC/DC conversion module;
• and
• at least one unidirectional rectifier module each of that comprises an input terminal and an output terminal, wherein the input terminal is electrically connected to the second transmission terminal of the corresponding first transformer, and the output terminal is electrically connected to a high-voltage grid.

A control method for a power system, wherein the power system comprises at least one high-voltage DC power generator and a high-voltage DC transformation apparatus electrically connected to the at least one high-voltage DC power generator, the high-voltage DC transformation apparatus comprises at least one bidirectional AC/DC conversion module, at least one first transformer and at least one unidirectional rectifier module, a DC terminal of the bidirectional AC/DC conversion module is electrically connected to the corresponding high-voltage DC power generator, each of the at least one first transformer comprises a first transmission terminal and a second transmission terminal, the first transmission terminal is electrically connected to an AC terminal of the corresponding bidirectional AC/DC conversion module, each of the at least one unidirectional rectifier module comprises an input terminal and an output terminal, the input terminal is electrically connected to the second transmission terminal of the corresponding first transformer, the output terminal is electrically connected to a high-voltage grid, and the control method comprises steps of:

• (a) converting a first DC voltage outputted by the high-voltage DC power generator into a first AC voltage by the bidirectional AC/DC conversion module;
• (b) boosting the first AC voltage to a second AC voltage by the first transformer;
• and
• (c) rectifying the second AC voltage by the unidirectional rectifier module to generate a second DC voltage.