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Grounding method and device of 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 high technical parameter requirements and large number of equipment, achieve simple equipment, low insulation requirements, and solve grounding problems Effect

Active Publication Date: 2020-09-01
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

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Embodiment Construction

[0037] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the application. Obviously, the described embodiment is only It is a part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0038] The embodiment of the present application provides 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. Grounding challenges when using third harmonic injection modulation methods in direct engineering.

[0039] see figure 1 with figure 2 , figure 1 A schemat...

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Abstract

The invention discloses a grounding method and device for a flexible DC system, and the method is executed in the flexible DC system, and comprises the steps: setting a converter station flexible DC transformer valve side winding at at least one end as a Yn connection wire; and arranging a neutral point resistor and a neutral point reactor in a grounding loop of the neutral point of the converterstation flexible direct current transformer valve side winding at at least one end to be grounded in series so as to limit the current value of the third harmonic in the grounding loop. By adopting the grounding method provided by the invention, only one neutral point reactor and one neutral point resistor are needed to be grounded, the equipment is simple, the insulation requirement is low, and the grounding problem when a third harmonic injection modulation method is used in flexible direct current engineering of a symmetrical monopole structure is solved.

Description

technical field [0001] The present application relates to the technical field of flexible DC system design, in particular to a grounding method and device for a flexible DC system. Background technique [0002] The selection of the grounding method is a key issue in the design of the flexible DC system. The function of the grounding is to clamp the voltage in a steady state, provide a zero-sequence path in the event of a ground fault, and cooperate 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] In the case of not setting the valve-side grounding point of the flexible DC 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 provided with a grounding point (there is no separate grounding resistance or grounding capacitance on the DC side), the two-pole DC-to-...

Claims

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Application Information

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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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