Voltage equalization modulation method and voltage equalization modulation device based on nearest level approximation

A recent technology of level approximation and modulation method, which is applied in the field of flexible power transmission and transformation, can solve the problems of large switching loss and many IGBT switching times
CN106787883BActive Publication Date: 2019-11-08TBEA SUNOASIS
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
TBEA SUNOASIS
Publication Date
2019-11-08

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Abstract

The present invention provides a common voltage modulation method based on the recent level, including: the default voltage limit Ξ”U and the adjustment factor H, if u max Puppet min <Ξ”U, in this control cycle, according to NON (K), NON (K‑1), and bridge arm current I arm The direction of the direction controls the cutting of the neutron modules of each bridge arm to reduce the frequency at average; if u max Puppet min β‰₯ Ξ”U, the minimum value of the capacitor voltage of the neutron module of each bridge arm min , Voltage limit Ξ”U, adjustment factor H and bridge arm current i arm Obtain the number of first additional adjustment modules corresponding to the bridge arm N BAN1 According to the maximum value of the capacitor voltage of the neutron module of each bridge arm max , Voltage limit Ξ”U, adjustment factor H and bridge arm current i arm Obtain the number of second additional adjustment modules corresponding to the bridge arm N BAN2 , Then according to n during this control cycle BAN1 N BAN2 , NON (K) and NON (K‑1) control the drop -cutting of the neutron modules of each bridge arm to reduce frequency.Correspondingly, a homogeneous modulation device is provided.The present invention can reduce the number of switches of power devices and reduce switching loss on the premise of meeting the mean pressure requirements.
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Description

technical field

[0001] The invention relates to the technical field of flexible power transmission and transformation, in particular to a voltage equalization modulation method based on nearest level approximation and a voltage equalization modulation device based on nearest level approximation. Background technique

[0002] Compared with traditional voltage source converters, modular multilevel converters (Modular Multilevel Converter, MMC) have the advantages of good scalability, small harmonics, low switching frequency, and less requirements for consistent triggering of devices. The advantages are obvious, especially suitable for DC transmission applications. MMC-based flexible DC transmission technology is widely used in new energy transmission, urban expansion, regional power grid interconnection, and island power supply. Compared with traditional DC transmission technology, the advantages of flexible DC transmission technology are gradually highlighted. A number of fl...

Claims

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