HVDC (high voltage direct current controller) and UPFC (unified power flow controller) system based on modularized multi-level converter
A modular multi-level converter technology, applied in the field of HVDC and UPFC systems, can solve the problems of non-centralized management and control, low utilization rate of equipment, repeated investment in construction, etc., to improve utilization rate, increase device capacity, Ease of centralized management and control
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[0042] Example one
[0043] This embodiment provides a HVDC and UPFC system based on a modular multilevel converter, and its topology is as follows image 3 As shown, it includes a converter device 1, a converter device 2, a converter device 11, a grounding circuit 3, a grounding circuit 12 and a DC transmission line 13;
[0044] One end of the converter device 1 is connected in series with the power grid, and the other end is connected in parallel with the grounding circuit 3; both ends of the grounding circuit 3 are divided into at least two branches. One branch is connected to the converter device 2 and then connected to the power grid to form a Group unified power flow controller UPFC; branch two is connected to the power grid through the DC transmission line 13 and the converter device 11 to form a group of flexible DC transmission HVDC; the DC transmission line 13 and the converter device Connect the grounding capacitor 12 between 11 in parallel.
[0045] Among them, each devi...
Example Embodiment
[0055] Example two
[0056] This embodiment is basically the same as the first embodiment, but the differences are:
[0057] In this embodiment, in order to control the access and exit of the converter device 2, a bypass switch 4 is connected in parallel at both ends of the transformer 10 in this embodiment, such as Image 6 Shown.
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