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    METHOD FOR OPERATING A POWER ELECTRONIC CONVERTER DEVICE WITH FLOATING CELLS
    2.
    发明申请
    METHOD FOR OPERATING A POWER ELECTRONIC CONVERTER DEVICE WITH FLOATING CELLS 有权

    公开(公告)号：US20230052562A1

    公开(公告)日：2023-02-16

    申请号：US17789899

    申请日：2020-12-16

    Applicant: ABB Schweiz AG

    Inventor： Ralph Mario Burkart ,  Ioannis Tsoumas ,  Frederick Kieferndorf ,  Tobias Geyer

    IPC: H02M7/49 ,  H02M7/487 ,  H02M1/00

    Abstract: In one embodiment, a method of operating a power electronic converter device for an electrical power converter system is provided. The power electronic converter device includes a converter circuit, a first converter, and a second converter. The first converter and the second converter are switch with a switching pattern such that the first converter and the second converter generate voltages with stepwise voltages changes and an output voltage of the power electronic converter device results frum a superposition of the voltages of the first converter and the second converter. The switching pattern includes switching instants for the second converter such that the voltage of the second converter leaves the fundamental voltage component of the voltage of the first converter unchanged, such that the second converter does not generate a fundamental component of the output voltage.

    OPTIMIZED PULSE PATTERNS FOR CONTROLLING A NEUTRAL POINT VOLTAGE
    4.
    发明申请
    OPTIMIZED PULSE PATTERNS FOR CONTROLLING A NEUTRAL POINT VOLTAGE 有权

    公开(公告)号：US20250047213A1

    公开(公告)日：2025-02-06

    申请号：US18717812

    申请日：2022-12-09

    Applicant: ABB Schweiz AG

    Inventor： Georgios Darivianakis ,  Eduardo Rohr ,  Frederick Kieferndorf ,  Tobias Geyer

    IPC: H02M7/487 ,  H02M1/12 ,  H02M1/15

    Abstract: A method for controlling an electrical converter comprises determining an actual modulation index (m) and an actual pulse number (d); determining a neutral point voltage (vnp) of the neutral point (NP); determining an actual neutral point balancing value from the neutral point voltage (vnp); determining an optimized pulse pattern to be applied to the electrical converter from a table of optimized pulse patterns stored in a controller of the electrical converter; and applying the determined optimized pulse pattern to the electrical converter. The table of optimized pulse patterns is indexed with respect to a set of modulation indices (m) and a set of pulse numbers (d) and the optimized pulse pattern is determined based on the actual modulation index (m) and the actual pulse number (d). For a modulation index (m) and a pulse number (d), an optimized pulse pattern stored in the table comprises switching angles and at least one of a switching state and switching transition of the at least one phase leg for each switching angle. For at least some modulation indices (m) and some pulse numbers (d), an optimized pulse pattern stored in the table with respect to a modulation index (m) and a pulse number (d) comprises switching angles, which correspond to different neutral point balancing values. The switching angles of the optimized pulse pattern to be applied to the electrical converter are determined from the switching angles, which correspond to different neutral point balancing values, as a function of the actual neutral point balancing value.

    METHOD FOR OPERATING A POWER ELECTRONIC CONVERTER DEVICE WITH FLOATING CELLS
    5.
    发明申请
    METHOD FOR OPERATING A POWER ELECTRONIC CONVERTER DEVICE WITH FLOATING CELLS 有权

    公开(公告)号：US20230042964A1

    公开(公告)日：2023-02-09

    申请号：US17789586

    申请日：2020-12-17

    Applicant: ABB Schweiz AG

    Inventor： Ioannis Tsoumas ,  Tobias Geyer ,  Mario Schweizer ,  Eduardo Rohr ,  Frederick Kieferndorf ,  Wim Van-der-Merwe ,  Manuel Vetterli ,  Christian Meier

    IPC: H02M7/487 ,  H02M7/5395 ,  H02M1/12

    Abstract: Described herein is a method of operating a power electronic converter device for an electrical power conversion system. The power electronic converter device includes a converter circuit including an input side, an output side, a first converter, and at least one second converter. The second converter includes at least one floating cell with a DC intermediate circuit and semiconductor devices. The method includes: switching the semiconductor devices of the floating cell at switching instants determined with optimized pulse patterns or carrier-based pulse width modulation; determining a fundamental voltage component for the floating cell; and generating the fundamental voltage component in the actual voltage of the floating cell by modifying the switching instants, such that a voltage VC AF of the DC intermediate circuit is lying in a given reference voltage range for balancing the DC intermediate circuit of the floating cell.

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