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Grounding method and device for flexible DC system

A flexible DC and grounding method technology, applied in circuit devices, emergency protection circuit devices, AC network circuits, etc., can solve the problems of large number of devices and high technical parameters, and achieve the effect of small reactive power loss

Active Publication Date: 2022-07-12
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Grounding method 3 (connection transformer YnD + valve side star reactance + neutral point grounding resistance) is available, but it has the characteristics of a large number of equipment and high technical parameters

Method used

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  • Grounding method and device for flexible DC system
  • Grounding method and device for flexible DC system
  • Grounding method and device for flexible DC system

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Embodiment Construction

[0037] In order to make those skilled in the art better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only It is a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0038] The embodiments of the present application provide a grounding method and device for a flexible DC system. A set of transformers only needs one neutral point reactor and one neutral point resistor, the equipment is simple, the insulation requirements are low, and the flexibility of the symmetrical single-pole structure is solv...

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Abstract

The present application discloses a grounding method and device for a flexible DC system. The grounding method is performed in the flexible DC system, and includes the steps of: setting the valve side winding of the flexible DC transformer in at least one end of the converter station to be connected to Yn; The neutral point resistor and the neutral point reactor are set in the grounding loop of the neutral point of the valve side winding of the flexible DC transformer of the converter station in series to limit the current value of the third harmonic in the grounding loop. Using the grounding method provided in this application, only one neutral point reactor and one neutral point resistor are required to be grounded, the equipment is simple, and the insulation requirements are low, which solves the problem of using the third harmonic injection modulation in the flexible direct engineering of the symmetrical single-pole structure. grounding problems when approaching.

Description

technical field [0001] The present application relates to the technical field of flexible DC system design, and in particular, to a grounding method and device for a flexible DC system. Background technique [0002] The choice of grounding method is a key issue in the design of the flexible direct system. The function of grounding is to clamp the voltage in steady state, to provide zero-sequence path in the event of a ground fault, and to provide a detection signal. The grounding point is generally set On the DC side of the flexible DC system or the valve side of the flexible DC transformer. [0003] Without setting the grounding point on the valve side of the flexible transformer, the DC pole-to-ground voltage is controlled by the DC pole-to-ground resistance or capacitance. If neither the valve side nor the DC side is set with a ground point (the DC side does not have a separate grounding resistance or grounding capacitor), the two-pole DC-to-ground voltage is actually co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02H7/26
CPCH02J3/36H02H7/268H02J2003/365H02J2203/20Y02E60/60
Inventor 卢毓欣赵晓斌李岩辛清明邹常跃郭龙徐迪臻秦康
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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