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Flexible direct-current transmission system coupled transformer tap adjusting method

A transformer tap and power transmission system technology, applied in the field of power electronics, can solve problems such as no related reports

Active Publication Date: 2014-12-10
NR ELECTRIC CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no relevant report on the tap adjustment method of the flexible direct current transmission system.

Method used

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  • Flexible direct-current transmission system coupled transformer tap adjusting method
  • Flexible direct-current transmission system coupled transformer tap adjusting method

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Embodiment Construction

[0024] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] figure 1 is a schematic diagram of the single-station structure of the flexible direct current transmission system, where figure 1 (a) Including AC system S, connection transformer T and converter C, the on-load tap tap of connection transformer T is located on the primary side, and when the tap is adjusted to increase the winding on the primary side, the voltage on the secondary side will decrease accordingly , otherwise the voltage on the secondary side will increase; where figure 1 (b) Including the AC system S, the connection transformer T' and the converter C, the on-load tap tap of the connection transformer T' is located on the secondary side, when the tap is adjusted to reduce the secondary side winding, the secondary side correspondingly The voltage on the secondary side will decrease, and vice ver...

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Abstract

The invention discloses a flexible direct-current transmission system coupled transformer tap adjusting method. The method includes that when modulation degree of a converter surpasses the upper limit, a tap is adjusted towards the voltage direction of the coupling variable valve lowering side, and if adjustment fails, capacitive reactive instructions of the converter are actively reduced; when the modulation degree of the converter is lower than the upper limit, the tap is adjusted towards the voltage direction of the coupling variable valve rising side, and if adjustment fails, the capacitive reactive instructions of the converter are actively increased. By the method, the adjustment degree of the converter can be effectively adjusted even when the tap fails or the tap position surpasses the limits, and stable operation performance of the converter can be guaranteed.

Description

technical field [0001] The invention belongs to the field of power electronics, and in particular relates to a method for adjusting taps of transformers connected to flexible direct current transmission systems. Background technique [0002] Flexible DC transmission uses voltage source converters, which can independently and quickly control active power and reactive power, thereby improving system stability, suppressing system frequency and voltage fluctuations, and improving the steady-state performance of grid-connected AC systems. Flexible DC transmission has great advantages in new energy grid connection, distributed generation grid connection, island power supply, urban distribution network power supply and other fields, so the research on flexible DC transmission related technologies is of great significance. [0003] The connection transformer of the DC transmission system generally adopts the on-load tap changer to adjust the voltage, so that the valve side voltage o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/12
Inventor 汪楠楠田杰董云龙刘海彬卢宇杨勇倪秋龙孙维真张静黄晓明陆翌裘鹏华文刘明康王栋费建平陈慧君
Owner NR ELECTRIC CO LTD
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