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.
Highlights
The energy storage system (ESS) has been attractive in various ancillary services for renewable energy generation and other applications [1,2]
This indicates that the device loss can be reduced and the energy transfer efficiency can be improved through power distribution in the energy-stored quasi-Z-source inverter (ES-qZSI)
Experiment, the total power loss was reduced by up to 40% with the power distribution regulation in ES-qZSI compared with the conventional qZSI
Summary
The energy storage system (ESS) has been attractive in various ancillary services for renewable energy generation and other applications [1,2]. Methods like softswitching and modulation strategy, aiming at device current stress reduction, were applied for efficiency improvement [15,16,17]. Energies 2020, 13, 5902 in [18,19], but the principle and operation range are still obscure due to the lack of interaction studies on the impedance network, the switching device stress, and the energy storage units. An optimal power in distribution improve efficiency has the beencurrent given storage units embedding[15,16,17]. A quasi-inverted-trapezoidal on the impedance switching device stress,between and the the energy storage units. A wide range optimal energy efficiency tracking technology reduction in the ES-qZSI is the energy-storage units embedding in the ES-qZSI studied method in detail.
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