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Converter station near-zone short-circuit current control method and system

A short-circuit current, near-zone short-circuit technology, used in AC network circuits, circuit devices, power transmission AC networks, etc.

Inactive Publication Date: 2020-08-07
CHINA ELECTRIC POWER RES INST +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention proposes a method and system for controlling the short-circuit current in the vicinity of the converter station to solve the problem of how to control the short-circuit current in the vicinity of the converter station

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  • Converter station near-zone short-circuit current control method and system
  • Converter station near-zone short-circuit current control method and system
  • Converter station near-zone short-circuit current control method and system

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Embodiment approach

[0058] Taking the AC short-circuit current calculation scenario of the near-area busbar of a domestic flexible DC project as an example, the applicability of the method proposed by the present invention is analyzed. image 3 It is a schematic diagram of a grid structure in a flexible DC near area according to an embodiment of the present invention. Such as image 3 As shown, node 18 is the flexible DC sending end, and the converter station is controlled by constant DC voltage and constant AC voltage; node 19 is the receiving end, and the converter station is controlled by constant active power and constant AC voltage.

[0059] Firstly, the electromagnetic transient simulation model in the vicinity of the flexible HVDC converter station is established. In order to improve the calculation efficiency, the AC system adopts simplified equivalent network processing. Through the electromagnetic transient simulation, the short-circuit current level of the bus bar near the converter s...

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Abstract

The invention discloses a converter station near-zone short-circuit current control method and system. The method comprises the steps: building an electromagnetic transient simulation model of a voltage sourced converter (VSC) connected to a power grid near zone, and initially setting a station-level control mode of a flexible DC power transmission system; judging whether the bus short-circuit current of the VSC near zone station is greater than a preset short-circuit current threshold value under the current control mode, and obtaining a first judgment result; and when the first judgment result indicates that the first judgment result is greater than the preset short-circuit current threshold value, switching the control mode of the reactive power of the VSC near region into a constant reactive power 0Mvar. According to the invention, the reactive power control mode of VSC is adjusted, the contribution current amplitude / phase during the short-circuit fault of the VSC is changed, the near-region short-circuit current level of the converter station is suppressed by changing the vector superposition relationship between the flexible direct-current contribution current component and the alternating-current short-circuit current component, and the problem that the near-region short-circuit current of the converter station exceeds the standard after the converter station is flexiblyand directly connected into a power grid is solved.

Description

technical field [0001] The present invention relates to the technical field of power systems, and more specifically, to a control method and system for short-circuit current in the vicinity of a converter station. Background technique [0002] In the operation of power system, short circuit is one of the most common faults, and the short circuit current generated by it will have serious impact and consequences on the safe and stable operation of power system. Flexible DC transmission technology has independent control of active and reactive power, passive system power supply and DC networking capabilities, and is more and more widely used in engineering applications worldwide. solution. So far, nearly 30 flexible DC transmission projects and nearly 100 conventional DC transmission projects have been put into operation around the world. [0003] However, there is still a lack of research on the short-circuit current after the flexible DC transmission system is connected to ...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02J3/18
CPCH02J3/36H02J3/18H02J2203/20Y02E40/30Y02E60/60
Inventor 霍启迪苏清梅唐晓骏陆颖铨黄霆吕思卓李可文陈萌黄道姗吉平张慧瑜申旭辉张伟骏谢岩陈伯建李晓珺李媛媛李晶罗红梅李立新张恺陈怡君
Owner CHINA ELECTRIC POWER RES INST
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