Abb Schweiz Ag

Hitachi Energy Switzerland Ag

Abb Technology Ag

Hitachi Energy Ltd

Abb Technology Ltd

Abb Power Grids Switzerland Ag

Alireza Nami

Frans Dijkhuizen

Jan Svensson

Christopher Townsend

Liwei Wang

Jiaqi Liang

Hector Zelaya De La Parra

Nan Chen

Roberto Alves

Aravind Mohanaveeramani

Tomas Lars Jonsson

Jyoti Sastry

Lennart Harnefors

Sasitharan Subramanian

Tomas Tengner

Haofeng Bai

Praveen Kumar Barupati

Hongbo Jiang

Vishal Vekhande

Federico Bertoldi

Marta Ibanez

Svensson Jan

Aravind Mv

A transformer arrangement is provided. The transformer arrangement includes a transformer with a primary and a secondary winding and a chain link of switching blocks connected in series between one of the windings and a load, where the switching blocks comprise a first set of voltage contribution blocks and a second set of circuit breaker blocks, where the first set of voltage contribution blocks is configured to adjust a voltage output by the transformer with an offset voltage and the second set of circuit breaker blocks is configured to interrupt a current running through the chain link.

Transformer arrangement

Provided is a transformer arrangement wherein active and/or reactive power can be injected in an alternating current link using a current regulator and a voltage regulator portion, wherein at least one winding with which the current regulator is connected in parallel is at least one tertiary winding, and wherein the current regulator includes a number of current regulator sections, each connected to a corresponding voltage regular section of a voltage regulator portion via a corresponding dc link.

The present disclosure relates to a converter cell () for an MMC. The cell comprises a primary energy storage (C), an inductor (Lf), and a secondary energy storage (C); and first and second converter valves (T, T). The secondary energy storage (C) is connected in series with the first converter valve (T), and together with said first converter valve in parallel with the inductor (L), and the primary energy storage (C) is connected in series with the second converter valve (T), and together with said second converter valve (T) in parallel with the inductor (L).

Buck boost converter cell for MMC

The present disclosure relates to a converter cell () for a power converter. The cell comprises a plurality of semiconductor devices (T) forming a half-bridge or full-bridge topology in the cell. The cell also comprises an energy storage () connected across the at least one switch leg (). The cell also comprises a crowbar leg () connected across the at least one switch leg, comprising a plurality of series connected semiconductor crowbar switches (C) arranged to short-circuit the energy storage (). The cell also comprises first and second AC terminals (A, B), wherein at least one of said AC terminals is connected to one of the at least one switch leg, between two of the plurality of series connected semiconductor devices of said switch leg, and connected to the crowbar leg, between two of the plurality of series connected crowbar switches of said crowbar leg.

Converter cell with crowbar

A voltage source converter includes a number of converter modules, one for each of a number of phases, connected in-series between two DC terminals. Each converter module includes an upper director valve in series with a lower director valve, where a junction between the two provides a primary AC terminal, an upper wayshaper section, a common waveshaper block and a lower waveshaper section in parallel with the valves, where the upper and lower waveshaper sections include multilevel cells and the common waveshaper block include at least one common waveshaper connected between the upper and lower waveshaper sections, a first switching element connected between a secondary AC terminal and the upper waveshaper section and a second switching element connected between the secondary AC terminal and the lower waveshaper section.

Voltage source converter with improved operation

A multilevel converter converting between AC and DC includes a phase leg having a first and a second phase arm, the first phase arm being connected between a first pole having a first potential and a first AC terminal and the second phase arm being connected between the first AC terminal and a second potential, where the phase arms include half-bridge and full-bridge cells, where each cell includes at least one energy storage element for providing the voltage contribution and cell switching units with cell switches and anti-parallel diodes for controlling the voltage contribution, where the full-bridge cells include a bypass switch controllable to bypass the corresponding energy storage element, and when a phase-to-ground fault occurs the cell switches are blocked and the bypass switches activated with a delay in relation to the blocking.

Multilevel converter with reduced AC fault handling rating

An energy storage system (ESS) for an electrical system includes an energy storage, and a converter interface arranged for connecting the energy storage to the electrical system. The converter interface includes a modular multilevel converter in which each phase leg includes a plurality of series connected cells of which at least one is a half-bridge cell and at least one is a full-bridge cell.

Energy storage system comprising a modular multi-level converter

A switching cell for a chain link includes a first side including a first terminal and a second terminal, a second side including a third terminal and a fourth terminal, a first switching unit, a second switching unit, and a first and a second capacitor unit. The first terminal is connected to the second terminal via the first capacitor unit. The first capacitor unit has its positive side facing the first terminal. The third terminal is connected to the fourth terminal via the second capacitor unit. The second capacitor has its positive side facing the fourth terminal. The second terminal is connected to the fourth terminal via the second switching unit. The switching cell also includes a third capacitor unit, and the first terminal is connected to the third terminal via a first series connection including the first switching unit and the third capacitor unit. The third capacitor unit has its positive side facing the third terminal. A switching module includes at least one such switching cell. The switching module can include at least two such switching cells, wherein the first switching cell and the second switching cell are connected in series in opposing directions, and wherein the second side of the first switching cell is connected to the second side of the second switching cell. A chain link including a number of switching modules in serial connection is also provided.

Switching cell, a switching module for a chain link, and a chain link for a multilevel converter

A converter arrangement and a method of controlling a three-phase converter arrangement connected to a transmission grid are provided. The converter arrangement includes three phase legs and an energy transfer circuit. The method includes providing a varying respective output phase voltage to the transmission grid by selecting energy storage elements of both the phase legs and the energy transfer circuit and connecting the selected energy storage elements to the transmission grid output. The method further includes selecting energy storage elements for performing a transfer of energy between the energy storage elements during the control period.

Converter arrangement for power compensation and a method for controlling a power converter

A multilevel converter converting between AC and DC includes a phase arm with a number of cells between a DC pole and an AC terminal, the cells include at least one hybrid full bridge cell including a first cell connection terminal for coupling to the DC pole, a second cell connection terminal for coupling to the AC terminal, an energy storage element having a positive and a negative end, a first group of series connected semiconducting units in parallel with the energy storage element, where a junction between these forms one cell connection terminal, and a second group of series connected semiconducting units in parallel with the energy storage element and including a third semiconducting unit and a fourth semiconducting unit consisting of a number of unidirectional conducting elements including at least one unidirectional conducting element, where a junction between these forms a further cell connection terminal.

Multilevel converter with hybrid full-bridge cells

It is presented a converter cell () arranged to be used in a high voltage multilevel converter. The converter cell comprises: an energy storage element () and a plurality of switching elements (S, . . . , S). The plurality of switching elements comprises at least one thyristor (S; S) and a plurality of transistors (S, S, S; S, S, S). Each one of the at least one thyristor (S; S) is provided in a position for a switching element in the converter cell where, during normal operation of the converter cell, the at least one thyristor is in a continuous conducting state. This reduces the power losses of the converter cell. A corresponding multilevel converter and a method are also presented.

Converter cell with reduced power losses, high voltage multilevel converter and associated method

In one aspect of the teachings herein, a self-commutated current source converter is operated in a manner that compensates for the reactive power consumption and/or harmonics generation of a line-commutated current source converter used in the transfer of electrical power between an AC power system and a DC power system. In this regard, the line-commutated current source converter is operated as a first converter in a hybrid converter apparatus and the self-commutated current source converter is operated as a second converter in the hybrid arrangement. According to one example, the first and second converters are stacked, such that each shares a portion of the DC voltage on the DC side of the hybrid converter apparatus, while in another example, the second converter is not used for power conversion and instead is used solely for compensation with respect to the first converter.

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Västerås, Sweden

Alireza Nami