Power balance control strategy for quasi-Z-source cascaded multilevel inverter units

被引：0
|
作者：
Du C.-S. [1 ]
Liu Q. [1 ]
Guo W.-J. [1 ]
Chen A.-L. [1 ]
机构：
[1] School of Control Science and Engineering, Shandong University, Jinan
来源：
Dianji yu Kongzhi Xuebao/Electric Machines and Control | 2019年 / 23卷 / 08期
关键词：
Grid-connected photovoltaic generation system; H-bridge cascaded multilevel inverter; Power balance; Quasi-Z-source; Virtual average power units;
D O I：
10.15938/j.emc.2019.08.003
中图分类号：
学科分类号：
摘要：
To solve the problem of the poor system stability and the low power quality caused by input power imbalance of the different cascade units, a power balance control method for different cascade units of the quasi-Z-source cascaded H-bridge multilevel inverter was proposed. First, the mathematical model of quasi-Z-source net-work and power model of the system were built. Then the operation principle was analyzed when the input power of the different units were not equal. The power balance control method based on adjusting the active power of different power units was proposed, which was implemented by inventing an average power unit and the average modulation ratio. According to the deviation between each unit output power and the virtual unit average power, their modulation signal factors were adjusted and combined with the shoot-through duty ratio of Z source inverter units. At last combining with the carrier phase-shift pulse width modulation technology, the power balance control for cascade inverter units and the DC bus voltage stability were implemented. Simulation and prototype test results verify that the proposed control strategy is correct and valid. © 2019, Harbin University of Science and Technology Publication. All right reserved.
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页码：19 / 27
页数：8
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