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Overvoltage protection method and overvoltage protection devices of modular multi-level converters

A modular multi-level, protective device technology, applied in the direction of emergency protection circuit devices, circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve protection uncertainty, insecurity, etc. problem, achieve the effect of reducing equipment cost, reducing insulation level, and reducing the amplitude and frequency of transient oscillating voltage

Active Publication Date: 2013-04-24
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the gap electric field is generally a non-uniform electric field, even an extremely non-uniform electric field, its discharge voltage, especially under the operating overvoltage wave and lightning overvoltage wave, has a certain random deviation, so the operating overvoltage and lightning overvoltage of the protected object There is certain uncertainty and insecurity in the protection of

Method used

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  • Overvoltage protection method and overvoltage protection devices of modular multi-level converters
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  • Overvoltage protection method and overvoltage protection devices of modular multi-level converters

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Embodiment 1

[0056] The first implementation of the overvoltage protection method for modular multilevel converters in the embodiment of the present invention is as follows: Figure 6 Shown:

[0057] In Embodiment 1, the structure of the modular multilevel converter is as follows figure 1 As shown, the internal sub-module of the converter adopts figure 2 The half-bridge sub-module structure shown. This modular multilevel converter is used for AC 110kV power grid, and the arrangement of the protection device provided by the present invention is as follows Figure 6 shown. The overvoltage protection device of the present invention is provided on the AC phase A to the ground, the AC phase B to the ground and the AC phase C to the ground of the modular multilevel converter to suppress the relative ground overvoltage introduced by the AC phase; at the same time, The overvoltage protection device of the present invention is provided between the DC terminal P and the DC terminal N to ground ...

Embodiment 2

[0066] The second implementation of the overvoltage protection method for modular multilevel converters in the embodiment of the present invention is as follows: Figure 7 Shown:

[0067] In Embodiment 2, the structure of the modular multilevel converter is as follows figure 1 As shown, the internal sub-module of the converter adopts image 3 The full-bridge submodule structure shown. The modular multilevel converter is used for AC 220kV power grid, and the arrangement of the protection device provided by the present invention is as follows Figure 7 As shown, the difference from Embodiment 1 is: between AC phase A and AC phase B, between AC phase B and AC phase C, and between AC phase C and AC phase A of the modular multilevel converter The overvoltage protection device of the present invention is set to suppress the phase-to-phase overvoltage introduced by the AC phase; at the same time, two devices of the present invention are connected in series between the DC terminal ...

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Abstract

The invention relates to an overvoltage protection method and overvoltage protection devices of modular multi-level converters. The overvoltage protection method comprises the following steps of arranging the overvoltage protection devices of the modular multi-level converters between alternating current ends of the modular multi-level converters and the ground, or between direct current ends and the ground, or between the alternating current ends, or between the direct current ends or more than one of the positions at the same time, setting operation voltage parameters of lightning arresters, setting operation voltages of discharging circuits and setting delay operation time of the discharging circuits, wherein each overvoltage protection device comprises the discharging circuit, a voltage-sharing damping circuit and the lightning arrester, the operation voltage parameters of the lightning arresters comprise reference voltages, operation overvoltage protection levels, lightning overvoltage protection levels and steep wave overvoltage protection levels, and the operation voltages of the discharging circuits are set according to expected invasion power frequency overvoltage levels. By means of the overvoltage protection method and the overvoltage protection devices of the modular multi-level converters, economical efficiency and reliability of the modular multi-level converters are improved.

Description

technical field [0001] The invention relates to a converter overvoltage protection method and device, in particular to a modular multilevel converter overvoltage protection method and its protection device. Background technique [0002] Modular Multilevel Converter (MMC) is a new type of converter based on turn-off devices. The most commonly used turn-off device today is the insulated gate bipolar transistor (IGBT). Modular multilevel converters (such as figure 1 ) includes a submodule 1 and a commutation reactor 2, and one or more submodules and commutation reactors are connected in series between each AC terminal (A, B, C) and DC terminal (P, N). The main components in a sub-module include IGBT, FWD, resistor R and capacitor C, and a typical sub-module structure includes a half-bridge sub-module (such as figure 2 ) and full-bridge submodules (such as image 3 ). The traditional line commutated converter (Line Commutated Converter, LCC) is a current source converter, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/04H02H9/06
CPCH02M1/32H02M2007/4835H02M7/4835
Inventor 贺之渊李泓志马巍巍杨杰季兰兰
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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