An Optimal Control Method for Overall Efficiency of Modular Power Electronic Transformer
A technology of power electronics and comprehensive efficiency, which is applied in the direction of adjusting electrical variables, control/regulation systems, and converting DC power input to DC power output. It can solve the problems of rapid aging of modular power electronic transformers, and extend the service life of equipment Improve system efficiency and avoid accelerated aging effects
Active Publication Date: 2019-03-05
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology
[0006] In order to avoid the problem that a specific basic power unit is in a high-power operation state for a long time, causing local rapid aging of the modularized power electronic transformer, the present invention also proposes a timing rotation control strategy to ensure that all basic power units are in a balanced operating state
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[0064] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0065] Such as figure 1 As shown, the power electronic transformer is composed of n basic power units Cell1-Celln connected in series. The intermediate DC capacitor and the isolated bidirectional DC / DC converter IBDC1 are composed; the single-phase H-bridge module HB1 is composed of a first bridge arm and a second bridge arm with the same structure; the first bridge arm is composed of a power electronic switch S1 connected in series -S2; the isolated bidirectional DC / DC converter IBDC1 is a dual-active H-bridge structure composed of power electronic switches S5-S12 and medium-high frequency transformers; the single-phase H-bridge modules HB1-HBn are controlled by a CHB controller ; The isolated bidirectional DC / DC converters are controlled by an IBDC controller; the IBDC controller is controlled by an efficiency optimization controll...
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The invention discloses a comprehensive efficiency optimization control method for a modularized power electronic transformer. The comprehensive efficiency optimization control method includes the steps of control mode determination, control under a voltage control mode, control under a power control mode, calculation of referential power value of each basic power unit, setting switch mode of an H-bridge mode, setting shift-phase ratio of each isolated bidirectional DC / DC transformer IBDC1-IBDCn and outputting multi-level voltage waveform. The system efficiency of the non-efficient highest-power operation point is improved, and the comprehensive efficiency of the system is optimized, Sine-approaching multi-level voltage and sine current at AC side are ensured under active non-power balance control condition, and current harmonic wave of connected grid voltage is reduced. A power instruction ordering timing rotation strategy is employed, so that opportunity of each module participating in high-power operation is equal. Accelerated aging of an individual module of the system is prevented, and the service lifetime of a modularized power electronic transformer is prolonged.
Description
technical field [0001] The invention relates to a method for optimizing the comprehensive efficiency of a power electronic transformer, in particular to a method for optimizing the comprehensive efficiency of a modularized power electronic transformer, belonging to the technical field of power electronic transformer control. Background technique [0002] Power electronic transformers are important equipment for future AC-DC hybrid power grids, DC transmission and distribution networks, DC wind power grid-connected systems, DC photovoltaic power grid-connected systems, ship power systems, rail traction power supply systems, and "Energy Internet" . [0003] In order to adapt to high-voltage and high-power applications, power electronic transformers usually use modular circuit series-parallel technology to solve the limitation of insufficient withstand voltage levels of power electronic devices. AC / DC power electronic transformers usually adopt a cascaded H-Bridge (Cascaded H-...
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IPC IPC(8): H02M3/158
CPCH02M3/158
Inventor 付超孙玉巍刘教民王毅
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)