Ultrahigh voltage modular multilevel flexible DC transmission neutral point earthing method

A modular multi-level, flexible DC transmission technology, applied in the direction of emergency protection circuit devices, electrical components, circuit devices, etc. used to limit overcurrent/overvoltage, can solve problems such as ineffective and consistent fault currents, and achieve Small land area, reduced manufacturing difficulty, high economical effect

Inactive Publication Date: 2017-11-21
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] To sum up, the existing transformer wiring and grounding methods cannot effectively and consistently fault current

Method used

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  • Ultrahigh voltage modular multilevel flexible DC transmission neutral point earthing method
  • Ultrahigh voltage modular multilevel flexible DC transmission neutral point earthing method
  • Ultrahigh voltage modular multilevel flexible DC transmission neutral point earthing method

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Embodiment Construction

[0053] The details of the present invention and the specific implementations thereof will be further described below with reference to the accompanying drawings.

[0054] see Figure 1 to Figure 17 As shown, the UHV modular multi-level flexible DC transmission neutral point grounding method of the present invention, based on the Yny wiring transformer, proposes a transformer Ynyrd neutral point high resistance grounding method suitable for UHV flexible DC transmission. Combined with UHV flexible DC transmission, and considering the magnitude of zero-sequence current and DC bias current, the parameter design of neutral point grounding resistance is carried out. It is mainly aimed at the unipolar symmetrical scheme, and the AC system is a direct grounding system, so the Yn wiring method must be used for the grid side connected to the transformer. Connect to △. At this time, the grounding of the flexible DC transmission system needs to be designed separately. At present, there...

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Abstract

The invention relates to an ultrahigh voltage modular multilevel flexible DC transmission neutral point earthing method, which belongs to the field of ultrahigh voltage flexible DC transmission. The method comprises the following steps: a balancing winding is added to a transformer with Yny wiring; the capacity of the balancing winding and the voltage grade are calculated; and neutral point earthing resistance parameters are designed. A connecting transformer adopts a Ynyrd neutral point high-resistance earthing mode, and in the method, through adding a third wiring in delta connection as the balancing winding, the defect of large third harmonic loss when a power system of an early stage uses the Yny wiring transformer can be solved. The method has the advantages that the occupied area is small, an earthing transformer can be saved, the economic performance is higher, and the making difficulty is reduced.

Description

technical field [0001] The invention relates to the field of ultra-high voltage flexible direct current transmission, in particular to a midpoint grounding method for ultra-high voltage modular multi-level flexible direct current transmission. Background technique [0002] UHV DC transmission technology refers to the transmission technology with a higher voltage level above 500kv and 750kv AC and ±500kv DC, including AC UHV transmission technology and DC UHV transmission technology. Foreign research on UHV transmission technology has a history of nearly 40 years. Whether it is UHV DC transmission or UHV AC transmission, it is to better improve the transmission capacity, realize high-power medium and long-distance power transmission, and realize long-distance power system interconnection to build a joint power system. [0003] my country has a vast territory, and the distribution of energy reserves and power load is extremely uneven. In power grid construction, energy distr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/08
CPCH02H9/08
Inventor 涂莉阳岳希杨杰江伟黄道姗张慧瑜张伟骏杜镇宇季明晶杨双飞辛业春宋祯子
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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