Equipment for switching direct current in one pole of a direct current network
A DC grid, DC current technology, applied in high voltage/high current switches, circuits, electrical switches, etc., can solve problems such as high transmission loss
Active Publication Date: 2017-03-08
SIEMENS ENERGY GLOBAL GMBH CO & KG
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Problems solved by technology
However, the disadvantage is that the operating current must also be conducted through the power semiconductor switch
The resulting high transmission loss
Method used
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[0047] figure 1 An exemplary embodiment of a device 1 according to the invention is shown, which has two terminals 2 and 3 , with which the device 1 can be connected in series in one pole, ie, one line, of a DC network. The device 1 is used to interrupt the current flow in the poles of the direct current network and can therefore be referred to as a direct voltage switch.
[0048] The device 1 has a main current branch 4 and a bypass current branch 5 . exist figure 1 In the embodiment shown in the two current paths are equal, in other words have approximately the same resistance. The direct current flowing between the terminals 2 and 3 thus flows both via the main current branch 4 and via the bypass current branch 5 . The main current branch 4 and the bypass current branch 5 each have two mechanical switches 6 , 7 , 8 and 9 . An intermediate branch potential point 10 is formed between the mechanical switches 6 and 7 of the main current branch 4 . The intermediate branch p...
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In order to reliably and cost-effectively disconnect fault currents in a DC grid, in which small losses occur simultaneously during normal operation, a device (1) for switching a DC current in one pole of a DC grid is proposed, which The device has: two terminals (2, 3) for series connection with the poles; a main current branch (4) extending between the terminals (2, 3), in which the main current branch Two mechanical switches (6, 7) are arranged in the circuit; a bypass current branch (5) extending between the terminals (2, 3) and connected in parallel with the main current branch (4) is located at all Two mechanical switches (8, 9) and / or two power semiconductors (20, 21) are also arranged in the bypass current branch; an intermediate branch (11) arranges the main current path (4) in The potential point (10) of the intermediate branch between the mechanical switches (6, 7) and the potential point (12) of the intermediate branch of the bypass current branch (5) arranged between the mechanical switches (8, 9) are mutually exclusive. connected and having a power switching unit (13) with a series circuit consisting of bipolar sub-modules (14) each with at least one power semiconductor switch (22) and for means (24) for reducing the energy released during switching; and means (34) for commutating the DC current into the intermediate branch (11), so that the total DC current is conducted via the intermediate branch (11) , wherein the commutation component (34) has at least one controllable power semiconductor (22, 36).
Description
technical field [0001] The invention relates to a device for switching a direct current in one pole of a branch of a direct current network. Background technique [0002] The worldwide increasing energy demand and the simultaneously expected reduction in carbon dioxide emissions make so-called renewable energy sources increasingly attractive. Renewable energy sources are, for example, wind power plants built by the sea or photovoltaic power plants in sunny desert regions. In order to be able to use the energy generated in this way economically, the connection of renewable energy sources to the continental power grid is becoming increasingly important. Against this background, the construction and operation of networked direct current grids are increasingly being discussed. A prerequisite for this, however, is that short-circuit currents that may occur in such an interconnected DC network can be disconnected quickly and reliably. However, DC voltage switches, which have no...
Claims
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IPC IPC(8): H01H33/59H01H9/54
CPCH01H33/596H01H9/542H01H2009/544
Inventor D.埃尔金H.甘巴赫H-J.克纳克A.菲利普
Owner SIEMENS ENERGY GLOBAL GMBH CO & KG