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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

Active Publication Date: 2015-07-08
STATE GRID CORP OF CHINA +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this scheme is that the reactor shares the fault current, the pressure on the connected transformer is small, and the reactor can also play a role in limiting the short-circuit current. The disadvantage is that for high voltage levels, the reactive power absorbed by the shunt reactor itself Larger, may have a greater impact on the system, and the manufacturing cost and volume will also be larger
In addition, due to the inherent defect that the existing technology cannot effectively deal with the DC fault of the MMC converter, if the DC side of the MMC converter is grounded, the probability of bipolar short-circuit faults occurring on the DC side will increase

Method used

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Examples

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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

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IPC IPC(8): H02H9/04H02J3/00H02J3/36H02J3/18
CPCY02E40/30Y02E60/60
Inventor 戴朝波宋洁莹周飞
Owner STATE GRID CORP OF CHINA
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