| 摘要 |
A three-dimensional direct current-direct current converter, used for implementing interconnected transmission between two direct current electrical grids. The converter comprises a first inverter (1), a second inverter (2), and a third inverter (3). The positive electrode of the first inverter (1) is connected to the positive electrode of a second direct current electrical grid (9). The negative electrode of the first inverter (1) is connected to the positive electrode of the second inverter (2). The negative electrode of the second inverter (2) is connected to the positive electrode of the third inverter (3). The negative electrode of the third inverter (3) is connected to the negative electrode of the second direct current electrical grid (9). The positive electrode of the second inverter (2) also is connected to the positive electrode of a first direct current electrical grid (8). The negative electrode of the second inverter (2) also is connected to the negative electrode of the first direct current electrical grid (8). The direct current-direct current converter fully utilizes a direct current voltage that already exists in the first direct current electrical grid (8) and, compared with a conventional direct current-direct current converter in the form of direct current/alternating current/direct current, greatly reduces the total inverter capacity used, thus reducing costs and wear. |
