Equipment used for transferring electric energy
A power transmission and equipment technology, applied in power transmission AC networks, output power conversion devices, electrical components, etc., can solve problems such as equipment damage and transmission power limitation, and achieve improved operational reliability, simplified coupling, and reduced smoothing. and the effect of filtering overhead
Inactive Publication Date: 2008-09-03
SIEMENS AG
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Problems solved by technology
In installations with self-commutating converters and capacitors as temporary energy stores, the disadvantage is the limitation of the transmitted power by the size of the capacitors used
In the event of a fault, extremely high short-circuit currents can cause damage to the device
So far only transmission voltages of up to approximately ±150 kV and transmission powers of approximately 300 to 500 megawatts have been achieved in practice with such arrangements
Method used
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[0043] In FIG. 1 a high-voltage direct current long-distance transmission for bidirectional power transmission from a transmission network or an alternating current grid 2 to another alternating current grid 3 is shown as a device for power transmission. device 1. In this case, the alternating current grids 2 and 3 are connected to the AC network via transformers and / or coils (not shown) or galvanically. Device 1 is connected. The device 1 comprises: a first converter 4 as an inverter for converting alternating current to direct current; a transmission cable 5 as a direct current conductor; and a second converter 6 as an inverter for converting the direct current into alternating current. The bipolar transmission cable 5 comprises two inner conductors 7 , 7 ′ and sheathed conductors 8 , 8 ′ shielding these conductors, the latter being respectively grounded at their ends or protected by other suitable measures (eg arresters) . The first converter 4 has three phase element...
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The invention relates to a device for electron energy transfer (1, 39) which comprises at least one current converter (4, 6, 40). Every current converter (4, 6, 40) has phase elements (10, 11, 12, 13, 14, 15, 27, 28, 29) with respective arrangements of circuit elements (10a...10i, 11a...11i, 12a...12i, 13a...13i, 14a...14i, 15a...15i, 10a'...10i', 11a'...11i', 12a'...12i') that comprise at least two turn-off power conductors (22, 23) each and at least two free-wheeling diodes (24, 25), each connected in parallel thereto, and energy storing means (26). The aim of the invention is to improve the transfer properties in or between power distribution networks.; For this purpose, the device is provided with means (16, 17, 18, 19, 43, 44, 45) for controlling the current converter in such a manner that epoch, amplitude and / or the instantaneous values of an alternating current of a transfer network that can be connected to the device and / or the direct current of a direct current line that connects at least one current converter to a direct current source, and / or the direct voltage and the direct current can be controlled by at least three interconnected current converters (4, 6, 40).
Description
technical field [0001] The invention relates to a device for the transmission of electrical energy, comprising at least one converter, wherein each converter has phase elements each having an arrangement of switching elements each comprising at least two switchable switches power semiconductors and at least two freewheeling diodes and energy storage devices respectively connected in parallel with the power semiconductors. Background technique [0002] Known installations of this type have, for example, two converters connected on the DC voltage side in order to transmit electrical energy between two electrically separated asynchronous or interconnected synchronous alternating current grids and to control the transmission in a targeted manner . This control is necessary because, for example, local overloads or uneven load distribution may occur in the AC grid. In this way, the overload can be balanced by the regulated energy transmission. This and a range of other devices ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H02M7/48H02M7/797H02M5/458H02J3/36H02J3/18H02J3/28
CPCY02E60/60Y02E40/50H02M2007/4835Y02E40/30H02M7/4835
Inventor 马克·戴维斯哈特穆特·黄迪特马·雷茨曼乔尔格·多恩
Owner SIEMENS AG