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mmc control during failure

A technology of fault and control device, applied in the direction of output power conversion device, transportation and packaging, AC network circuit, etc., can solve the problems of power transmission interruption, tripping of the main circuit breaker of the converter, etc., to achieve the effect of increasing the margin

Active Publication Date: 2022-05-24
HITACHI ENERGY SWITZERLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This could cause the converter main circuit breaker to trip, resulting in interruption of power transfer, which is not desired

Method used

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Embodiment Construction

[0019] Various embodiments will now be described more fully hereinafter with reference to the accompanying drawings, in which certain embodiments are shown. However, other embodiments in many different forms are possible within the scope of the present disclosure. Rather, the following embodiments are provided by way of example so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Throughout the specification, the same numbers refer to the same elements.

[0020] The following description focuses on the railway interlocking power grid MMC (3-phase to 1-phase direct converter) (see figure 1 ), but embodiments of the present invention can easily be applied to other topologies such as, for example:

[0021] Statcom in MMC delta topology (see figure 2 ).

[0022] • Statcom in MMC star and / or dual star topology.

[0023] • 3-phase to 3-phase MMC in direct and / or indirect topology (eg, for pumped h...

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PUM

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Abstract

The present disclosure relates to a method of controlling a Modular Multilevel Converter (MMC) (1) during a fault in a grid (5) to which the MMC is connected. The MMC comprises a plurality of phases (2), each phase comprising at least one phase leg (3). Each phase leg comprises a plurality of converter units (4) connected in series. The method includes determining that a fault has occurred in the grid, the fault comprising a reduced voltage in the grid. The method also includes, for each phase leg of the MMC, reducing the DC voltage of the phase leg by a predetermined amount from a nominal DC voltage to a reduced DC voltage of each cell of the phase leg The sum of all corresponding voltages across an energy storage device. The method also includes determining that the fault has been cleared, whereby the voltage in the grid returns to a nominal value. The method also includes, for each of the phase legs of the MMC, increasing the DC voltage back to the nominal DC voltage.

Description

technical field [0001] The present disclosure relates to controlling the MMC during a fault in the grid to which the MMC is connected. Background technique [0002] A modular multilevel converter (MMC) (also called a chain link converter (CLC)) includes a plurality of converter units (also called converter sub-modules) that Series connection (cascading, chain link) in converter branches (also called phase branches or phase arms), which can in turn be arranged in star (Y), delta, direct or indirect in the flow topology. Each converter cell includes semiconductor switches in a topology, forming a half-bridge (unipolar) or full-bridge (bipolar, H-bridge) circuit with capacitors for storing energy. Semiconductor switches such as insulated gate bipolar transistor (IGBT) devices, gate turn off thyristor (GTO) devices, integrated gate commutated thyristor (IGCT) devices, or metal oxide semiconductor field effect transistor (MOSFET) devices can be used to switch the The capacitor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/32H02M7/483
CPCH02M1/32H02M7/4835H02J3/00125B60M3/02H02M1/0025
Inventor B·巴克曼C·班凯努
Owner HITACHI ENERGY SWITZERLAND AG