Power grid neutral point flexible grounding current compensation system

A neutral point grounding, flexible grounding technology, applied in reactive power compensation, reactive power adjustment/elimination/compensation, AC network to reduce harmonics/ripples, etc., can solve equipment manufacturing difficulties, power grid neutral point grounding The problem of a single method, etc., achieves the effect of facilitating the protection configuration, improving the accuracy of the protection action, reducing the number of devices or the withstand voltage requirements.

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

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Problems solved by technology

The above method, the neutral point grounding method of the power gr

Method used

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  • Power grid neutral point flexible grounding current compensation system
  • Power grid neutral point flexible grounding current compensation system
  • Power grid neutral point flexible grounding current compensation system

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Embodiment Construction

[0034] 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.

[0035] figure 1 It is a circuit structure diagram of the neutral point flexible grounding compensation system of the present invention;

[0036] refer to figure 1 , a neutral point flexible grounding current compensation system according to an embodiment of the present invention, specifically includes: a grounding transformer 10, a power electronic device 20, a controller 30, and a rectification circuit 40;

[0037] Wherein, the primary winding of the grounding transformer 10 is respectively connected to each phase of the power grid bus 100, such as phase A, phase B and phase C, the secondary winding of the grounding transformer 10 is a star-shaped structure with a neutral ...

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Abstract

The invention discloses a power grid neutral point flexible grounding current compensation system, which comprises a grounding transformer, a power electronic device, a controller and a rectifying circuit, wherein a neutral point of a primary winding of the grounding transformer is grounded, a phase line and a neutral line of a secondary winding of the grounding transformer are connected to an output end of the power electronic device, the controller is connected to each phase of a power grid bus and the power electronic device and is used for measuring voltage and current of the power grid bus and voltage and current of each circuit of the power electronic device and controlling the power electronic device to input current into the secondary winding of the grounding transformer, and the rectifying circuit provides direct current for the power electronic device. The system disclosed by the invention can realize various power grid neutral point grounding modes and can switch the various power grid neutral point grounding modes online, and solves a 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 current compensation 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 p...

Claims

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Application Information

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IPC IPC(8): H02J3/18H02J3/01
CPCY02E40/30Y02E40/40
Inventor 时振堂姜俊莉张明钱志红李君刘维功
Owner CHINA PETROLEUM & CHEM CORP
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