Optimal Energy Efficiency Tracking in the Energy-Stored Quasi-Z-Source Inverter

Sideng Hu, Zipeng Liang, Jing Zhou and Xiaoli Yu
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Sideng Hu: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Zipeng Liang: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Jing Zhou: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Xiaoli Yu: Department of Energy Engineering, Zhejiang University, Hangzhou 310027, China

Energies, 2020, vol. 13, issue 22, 1-14

Abstract: In this paper, the interaction between the energy storage (ES) power distribution and system efficiency enhancement is researched based on the energy stored quasi-Z-source inverter. The corresponding current counteraction, stress reduction, power loss profile, and efficiency enhancement around the embedded energy storage units are studied in details. Firstly, the current counteraction effect on the device current is presented with the embedded ES source. The corresponding reduction in the device current stress is revealed. Then, the detailed device power loss expressions with current redistribution in the impedance network are explored mathematically. A quasi-inverted-trapezoidal power loss profile is found with the embedded source power distribution. To further increase the overall system efficiency, an optimal energy efficiency tracking strategy is proposed for the ES-qZSI (energy-stored quasi-Z-source inverter) based on the power distribution control. Both the simulation and the experiment verified that the power loss is reduced by over 40% through the proposed efficiency enhancement method. The device current and loss analysis for the embedding of energy storage can also be extended to the operating range optimization in other ES systems.

Keywords: ES-qZSI; energy storage unit; power loss analysis; optimal operation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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