Direct current side series connection and alternating current side parallel connection type electric energy tapping device
A DC-side and AC-side technology, applied in the field of power conversion device topology for high-voltage direct current transmission channels, can solve the problems of limited voltage level of parallel-connected tapping devices and difficulty in realizing bidirectional power flow, and reduce construction costs and Effect of operating voltage
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specific Embodiment approach 1
[0048] Specific implementation mode one: in figure 1 shows a main circuit of a DC-side series AC-side parallel-connected power tap device, including: 3 bridge-type single-phase DC / AC bidirectional converters (4, 5, 6), 3 single-phase transformers (7 , 8, 9). Three bridge-type single-phase DC / AC bidirectional converters are connected in series and connected to the DC busbars (1, 2) in parallel; the AC output terminals of the basic converter unit are connected to the input terminals of the single-phase transformer in one-to-one correspondence; the The output end of the single-phase transformer is connected to the three-phase ports A, B, and C of the AC network (3).
[0049] In the first specific embodiment, a DC-side series and AC-side parallel type electric energy tapping device is figure 2 The form shown is connected to an external circuit, and the left / right bridge arms are both composed of submodule bridge arms (4-1, 4-2, 4-3, 4-4). Among them, the DC sides of the three ...
specific Embodiment approach 2
[0054] Specific implementation mode two: refer to Figure 6 This embodiment is described in detail. This embodiment is a further description of the specific embodiment-a DC side series AC side parallel type power tap device. In this embodiment, the three bridge-type single-phase DC / AC bidirectional converters The right bridge arms are all capacitive bridge arms (4-10, 4-11). Compared with the first embodiment, half of the sub-modules are omitted in the second embodiment, which can save costs. In the second specific implementation mode, the voltage modulation strategy of the bridge type single-phase DC / AC bidirectional converter is as follows: Figure 7 As shown, since the right bridge arm is two capacitors connected in series, the midpoint potential u of the right bridge arm bn is close to 0v, so it is only necessary to control u according to the traditional dq decoupling control method an To control, the converter can be controlled to output AC voltage u ab .
[0055] The...
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