High voltage flexible direct current transmission system and its main circuit equipment determination method
A flexible DC and power transmission system technology, applied in the direction of power transmission AC network, etc., can solve problems such as DC line system outage, achieve the effect of controlling loss level, improving reliability, and increasing safety margin
Active Publication Date: 2019-12-31
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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- Application Information
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Problems solved by technology
[0004] Based on this, it is necessary to propose a method for determining the HVDC flexible DC transmission system and its main circuit equipment in view of the problem that the DC line is prone to failure and cause system outage in the HVDC flexible transmission system
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[0025] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0026] The high-voltage flexible direct current transmission system in an embodiment includes: a sending-end converter station, a bipolar connection, and a receiving-end converter station; see figure 1 , the structure of the sending-end converter station and the receiving-end converter station are the same, both including a converter valve group and a connecting transformer; the converter valve group of the sending-end converter station is connected to the The connection of the converter valve group of the converter station at the receiving end;
[0027] The converter valve group of the sending-en...
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The invention provides a high-voltage flexible DC transmission system comprising a sending end converter station, bipolar connection and a receiving end converter station. The sending end converter station and the receiving end converter station each comprise a converter valve group and a connection transformer. The converter valve group of the sending end converter station is connected with the converter valve group of the receiving end converter station through a DC line of the bipolar connection. The converter valve group of the sending end converter station and the converter valve group ofthe receiving end converter station each include a flexible DC converter, including six bridge arms. Each bridge arm includes a bridge arm reactor and a converter valve string, and the bridge arm reactor and the converter valve string in each bridge arm are connected in series. The bridge arm reactor of one upper bridge arm is connected in series with the corresponding bridge arm reactor of the lower bridge arm and is connected with the corresponding connection transformer. Each converter valve string includes a plurality of full-bridge power modules and the plurality of full-bridge power modules are cascaded, or, each converter valve string includes a half-bridge power module and a full-bridge power module, and the half-bridge power module and the full-bridge power module are cascaded.
Description
technical field [0001] The invention relates to the field of flexible direct current transmission, in particular to a method for determining main circuit equipment of a high-voltage flexible direct current transmission project. Background technique [0002] Flexible DC transmission uses fully-controlled power devices (such as Insulated Gate Bipolar Transistor, IGBT), and does not rely on AC grid commutation. When the inverter station is connected to the AC system and a short-circuit fault occurs, commutation failure will not occur. During the failure of the AC system at the inverter side, the flexible DC transmission system can continuously provide active support to the AC system, and can also provide reactive power support to the faulty AC system, which is conducive to maintaining the stability of the AC system. Therefore, it is a major development direction of power grid technology to apply flexible DC transmission technology to long-distance, large-capacity, overhead line...
Claims
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IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 周月宾饶宏许树楷朱喆
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD