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Multiphase multilevel power converter having a drive and a passive frequency filter, and method for driving the multiphase multilevel power converter

A technology of converters and controllers, which is applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc., and can solve problems such as expensive filter components, large resonance points, and resonance point excitation

Pending Publication Date: 2021-04-09
SIEMENS ENERGY GLOBAL GMBH CO & KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reduction of the resonance point requires very large and therefore very expensive filter components
If the resonance point lies above the sampling frequency, it may even lead to further excitation of the resonance point due to aliasing effects

Method used

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  • Multiphase multilevel power converter having a drive and a passive frequency filter, and method for driving the multiphase multilevel power converter
  • Multiphase multilevel power converter having a drive and a passive frequency filter, and method for driving the multiphase multilevel power converter
  • Multiphase multilevel power converter having a drive and a passive frequency filter, and method for driving the multiphase multilevel power converter

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Embodiment Construction

[0043] exist figure 1 A device 1 with a modular multilevel converter MMC (Modular Multilevel Converter) is shown in . The modular multilevel converter MMC is electrically connected in three phases to the supply network 7 via the connection rail 5 and the transformer 5 a. In this embodiment, the power supply network 7 is a three-phase AC power supply network. The current flowing through the multilevel converter MMC is measured by means of a current sensor 10 . The measured current values ​​13 are transmitted to the control unit 15 of the modular multilevel converter MMC. Furthermore, the voltage applied to the connection rail 5 , ie the connection voltage, is measured by means of a voltage sensor 18 , here embodied as a measuring transformer. This voltage corresponds substantially to the voltage applied to the modular multilevel converter MMC. The voltage value of the connection voltage 21 is transmitted to the control unit 15 .

[0044] The control unit 15 includes a digi...

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Abstract

Multiphase multilevel power converter having a drive and a passive frequency filter, and method for driving the multiphase multilevel power converter. The invention relates to a multiphase multilevel power converter (MMC) having a phase module (210) formed from a plurality of submodules (610) which have an energy store (1020), wherein the energy store voltage (Uzk) can be connected and disconnected as a submodule voltage (UDC) between the two submodule poles (ACP1, ACP2), and wherein, in order to attenuate higher-frequency components of the connection voltage (21), a passive frequency filter (F) is provided for each phase module (210), the resonant frequency (fr) of which frequency filter is above a sampling frequency (ft) of a digital regulating system (15a) which connects disconnected submodule voltages (UDC) and disconnects connected submodule voltages (UDC) at successive sampling times (ti) in each case. In order to avoid exciting the point of resonance of the frequency filter (F), it is proposed that the drive (15) has a controller (15b) which briefly connects and again disconnects at least one of the disconnected submodule voltages (UDC) at least once within a sampling interval (Ti) of the regulating system (15a) in each case for a submodule voltage (UDC) which is connected by the regulating system (15a). The invention also includes a method for driving the multiphase multilevel power converter (MMC).

Description

technical field [0001] The invention relates to a multiphase multilevel converter with a control device and a passive frequency filter and a method for controlling a multiphase multilevel converter according to claim 1 and the preamble of claim 10 . Background technique [0002] Multiphase multilevel converters are known and are connected, for example, to a three-phase AC supply network. [0003] Each multilevel converter has a plurality of phase modules consisting of a plurality of bipolar sub-modules electrically connected in series. The submodule has a plurality of semiconductor switches and a unipolarly rechargeable energy store, wherein the semiconductor switch can be used as a submodule voltage to switch on and off the energy store voltage dependent on the charge level of the energy store, the submodule voltage Correspondingly, it exists between the poles of the two submodules. [0004] The total current flowing through the multilevel converter and thus the phase mod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/12H02M7/483H02M1/00
CPCH02M1/126H02M1/0012H02M7/4835Y02B70/10
Inventor M.皮希尔
Owner SIEMENS ENERGY GLOBAL GMBH CO & KG
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