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Power network neutral point flexible ground system

A technology of neutral point grounding and flexible grounding, which is applied in the field of electric power system, can solve problems such as the impossibility of fully compensating capacitive current and active power loss of grounding transformers, and achieve the effects of convenient protection configuration, increased power, and improved compensation effect

Active Publication Date: 2017-05-31
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since both the arc suppression coil and the grounding transformer have active losses, it is practically impossible to fully compensate the capacitive current

Method used

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  • Power network neutral point flexible ground system
  • Power network neutral point flexible ground system
  • Power network neutral point flexible ground system

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Embodiment Construction

[0030] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0031] figure 1 It is the circuit structure diagram of the neutral point flexible grounding system of the power network of the present invention.

[0032] refer to figure 1 , the neutral point flexible grounding compensation system of the power network according to the embodiment of the present invention specifically includes: a grounding transformer 10, a power electronic device 20, a controller 30 and a rectification circuit 40;

[0033]Wherein, the primary winding of the grounding transformer 10 is respectively connected to each phase of the power grid bus 100, the secondary winding of the grounding transformer 10 is arranged in an open triangle structure, and the outlet...

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Abstract

The present invention discloses a power network neutral point flexible ground system. The system comprises a grounding transformer, a power electronic device, a controller and a rectifying circuit. Primary winding of the grounding transformer is accessed into a power network busbar and a neutral ground, the secondary winding of the grounding transformer is arranged an open-mouth triangular structure, the secondary winding is accessed into the output end of the power electronic device, the controller is connected to the power network and the power electronic device, the controller measures the voltage and the current of the power network and the voltage and the current of the power electronic device and controls the power electronic device to input current to the secondary winding of the grounding transformer, and the rectifying circuit provides direct current of the power electronic device. The system can realize a plurality of power network neutral point grounding modes and online switching so as to solve the problem that the power electronic device bears high voltage.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a neutral point flexible grounding system of a power network. Background technique [0002] The neutral point of the three-phase AC power system, that is, the neutral point of the star-connected transformer and motor, and the electrical connection between the earth is called the grid neutral point grounding method. The neutral point grounding method involves the safety, reliability and economy of the power grid, and directly affects the selection of equipment insulation level, system overvoltage level and relay protection mode, communication interference, etc. [0003] The power grid of 110kV and above generally adopts the large current grounding method, that is, the neutral point effective grounding method, so that the neutral point potential is fixed at the ground potential, and when a single-phase ground fault occurs, the voltage of the non-faulted phase will not increas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/08H02H7/26H02J3/01H02J3/18
CPCH02H7/26H02H9/08H02J3/01H02J3/1842Y02E40/30Y02E40/40
Inventor 时振堂杨明乾黄长明杜红勇李琼孙进
Owner CHINA PETROLEUM & CHEM CORP
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