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Voltage Balancing in Modular Multilevel Converters with Delta Configuration

A modular multi-level converter technology, applied in the direction of output power conversion devices, electrical components, circuit devices, etc., can solve problems such as limiting inrush current

Active Publication Date: 2020-09-08
HITACHI ENERGY SWITZERLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

No charging resistor is required in this case because the charging transformer impedance limits the inrush current

Method used

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  • Voltage Balancing in Modular Multilevel Converters with Delta Configuration
  • Voltage Balancing in Modular Multilevel Converters with Delta Configuration
  • Voltage Balancing in Modular Multilevel Converters with Delta Configuration

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Embodiment Construction

[0020] Embodiments will now be described more fully hereinafter with reference to the accompanying drawings, in which certain embodiments are shown. However, other embodiments are possible in many different forms 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 this specification, like numerals refer to like elements.

[0021] figure 1 An embodiment of a three-phase MMC 1 is schematically shown. The MMC 1 comprises three phase legs 2 (one for each phase) connected in a delta configuration. The MMC 1 is connectable to an electric power grid (not shown) via at least one circuit breaker (not shown). The circuit breakers may include sub-breakers for each phase. As indicated in the figure, each phase has a corresponding voltage (V) and current (i). Each phase leg 2 comprises...

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PUM

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Abstract

The present disclosure relates to a method of discharging a modular multilevel converter (MMC) (1) comprising a plurality of phase legs (2) connected in a delta configuration. Each arm comprises a plurality of sub-modules (3) connected in series, each sub-module comprising an energy storage device. The method includes disconnecting the MMC from the power grid, discharging the energy storage device by means of circulating current, and reconnecting the MMC to the power grid. Discharging consists of, for each phase leg: setting a voltage reference, and sequentially selecting submodules in the zero state by means of a sorting algorithm for switching each selected submodule to the plus or minus state until it matches the The voltage deviation of the set voltage reference of the energy storage device of each sub-module is within a predefined range.

Description

technical field [0001] The present disclosure relates to a method of discharging a modular multilevel converter (MMC) comprising a plurality of phase legs connected in a delta configuration. Each phase leg includes a plurality of sub-modules connected in series, each sub-module including an energy storage device. Background technique [0002] An MMC, also known as a chain-link converter (CLC), comprises converter branches each having a plurality (eg, ten to forty) of converter units or converter sub-modules connected in series, wherein the The converter branches in turn can be arranged in wye / star, delta and / or indirect converter topologies. The converter unit is a bipolar unit with a full-bridge (H-bridge) circuit or a unipolar unit with a half-bridge circuit, and includes a capacitor for storing energy and a converter for connecting the capacitor to one or both polarities power semiconductor switches such as insulated gate bipolar transistor (IGBT) devices, integrated ga...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/32H02J3/18H02M7/483
CPCH02M1/32H02J3/1857H02M7/483Y02E40/20H02M1/322H02M7/4835H02M7/4833H02M7/4837
Inventor B.布楚曼J.费仕
Owner HITACHI ENERGY SWITZERLAND AG