Converter grounding system

A grounding system and converter technology, applied in AC network circuits, power transmission AC networks, emergency protection circuit devices for limiting overcurrent/overvoltage, etc. The problems of large power and large system impact can achieve the effect of reducing equipment, reducing land occupation and strong adaptability

A grounding system and converter technology, applied in AC network circuits, power transmission AC networks, emergency protection circuit devices for limiting overcurrent/overvoltage, etc. The problems of large power and large system impact can achieve the effect of reducing equipment, reducing land occupation and strong adaptability

CN104767191AActive Publication Date: 2015-07-08STATE GRID CORP OF CHINA +1
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  • Converter grounding system
  • Converter grounding system
  • Converter grounding system

Examples

Experimental program
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Effect test

Embodiment 1

[0047] The technical solution of the invention in this example aims at the characteristics and requirements of the MMC converter with a half-bridge structure, taking the unified power flow controller as an example, and proposes a unified power flow controller, a switchable static compensator and a unified power quality conditioner. grounding system, if attached figure 1 shown in . Wherein, the DC side of the converter 1 is connected to the DC side of the converter 2 . Inverter 1 / Inverter 2 may be an MMC converter, an H-bridge cascaded converter, a flying capacitor converter, or a diode-clamped converter. The AC side of the converter 1 is connected in parallel with the system through a parallel transformer T1. The parallel transformer T1 has only two windings. The winding on the system side of the parallel transformer T1 adopts a delta connection, and the winding on the valve side of the parallel transformer T1 adopts a star connection. The star-shaped neutral point of the pa...

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Abstract

The invention relates to a converter grounding system. Converters are MMC converters or H-bridge cascade converters or converters with flying capacitors or converters with diode clamps. The converter grounding system comprises converters connected with a DC side, wherein an AC side of one converter is connected with an electric system in parallel through one transformer, an overvoltage protecting device and a grounding device are arranged on a winding of a valve side of the transformer, the AC side of the other converter is connected with the system in series through the other transformer, and an overvoltage protecting device and a grounding device are arranged on a winding of a valve side of the other transformer. By means of the technical scheme, according to the characteristics of an MMC technology, the converter grounding system which is suitable for a unified power-flow controller, a convertible static compensator and a unified power quality conditioner is researched and put forward.

Description

Technical field: [0001] The invention relates to the field of power electronic devices, and more specifically relates to a grounding system for a converter. Background technique: [0002] The neutral point of the power system refers to the neutral point of the star-connected transformer (or generator). The neutral point grounding mode of the power system is divided into two types: the neutral point effective grounding mode and the neutral point non-effective grounding mode. Neutral point non-effective grounding methods can be divided into neutral point non-grounding method, neutral point low resistance grounding method, neutral point high resistance grounding method and neutral point resonance grounding method. [0003] The neutral point high-resistance grounding method means that at least one wire or point in the system is grounded through high resistance, the equivalent zero-sequence resistance of the system is not greater than the distributed capacitive reactance of the ...

Claims

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Application Information

Patent Timeline
08 Jul 2015
Publication
CN104767191A
IPC
H02H9/04; H02J3/00; H02J3/36; H02J3/18
CPC
Y02E40/30; Y02E60/60
Inventors
戴朝波; 宋洁莹