In this paper, a novel nine-level inverter is developed by connecting a switched-capacitor (SC) unit at the rear stage of the conventional three-level neutral-point-clamped (NPC) inverter. The SC unit consists of two ...
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ISBN:
(纸本)9781665486682
In this paper, a novel nine-level inverter is developed by connecting a switched-capacitor (SC) unit at the rear stage of the conventional three-level neutral-point-clamped (NPC) inverter. The SC unit consists of two capacitors, four transistors and one bidirectional switch implemented by two anti-series connected transistors. Powered by a dc source V-in, the proposed inverter is capable of generating nine output levels with double boosting factor. Using direct current control strategy, the unique structure enables the inverter to transfer bidirectional power between the dc side and the ac side, which possesses great application value to grid-connected applications such as renewable power generation, hybrid ac/dc microgrid, vehicle-to-grid (V2G) and so on. Circuit description, operation principle and capacitance determination are analyzed in detail. Finally, simulation results are provided to verify the feasibility of the proposed inverter and the effectiveness of direct current control strategy.
This paper presents a new 3-phase multilevel inverter (MLI) based on a supercapacitor (SC) unit, which is ideal for medium and low-voltage grid-feeding photovoltaic (PV) applications since it is built to deliver nine ...
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Surface engineering has made substantial advances in recent years, owing to the demand for increased wetting qualities in a variety of applications. In this study, we describe a novel method for improving surface wett...
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Recently, recursive least square (RLS) based model free predictive control (MF-PC) has been widely applied to model estimation for superior performance to model-based method. In most previous researches the forgetting...
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ISBN:
(纸本)9781665409841
Recently, recursive least square (RLS) based model free predictive control (MF-PC) has been widely applied to model estimation for superior performance to model-based method. In most previous researches the forgetting factor which is a tradeoff between the convergence speed and the steady-state tracking error is usually neglected, thus selected as a constant to ensure robustness. In this paper, a dynamic forgetting factor based bias compensated RLS (DFF-BCRLS) is proposed for model free predictive current control of a voltage source inverter. The dynamic forgetting factor is calculated by local optimal forgetting factor (LOFF) algorithm to improve data convergency and steady-state robustness. A bias compensation (BC) scheme is presented to further increase the accuracy of parameter estimation and immune input noise. The simulation results show that the proposed strategy has smaller tracking error in steady-state and better performance against model or parameter mismatches compared to the conventional RLS.
In recent years, activities across countries have increasingly been carried out digitally, with information being shared over networks to boost speed and efficiency. However, this digital transformation poses security...
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Modular multilevel converter is a fast emerging critical technology in HVDC applications. It comprises of high number of capacitors and reliability of the converter highly depends on the capacitors. Condition monitori...
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Multi-input Multi-output (MIMO) DC-DC converters are gaining popularity in power electronics systems due to their ability to improve efficiency and reduce costs. These converters integrate power from multiple input so...
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Accurate precipitation forecasting plays a pivotal role in weather forecasting and disaster management. This study introduces a novel approach, the Dynamic Quality Weighting Multi-source Fusion Method, designed for pr...
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The audio video bridging (AVB) technology has been standardized by ieee to deliver high-quality audio/video in real time over an Ethernet network. The ieee AVB Ethernet standard includes protocols to synchronize time,...
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ISBN:
(纸本)9781665426787
The audio video bridging (AVB) technology has been standardized by ieee to deliver high-quality audio/video in real time over an Ethernet network. The ieee AVB Ethernet standard includes protocols to synchronize time, set up standards for stream reservation, and schedule standards for forwarding and queuing, among others. However, AVB is difficult to apply to industrial networks such as industrial automation and automobiles due to lack of consideration for control data that must ensure transmission time. To solve this issue, ieee proposes the 802.1 time-sensitive network standard, and various studies are being conducted with regard to related applications. In this study, based on the structure of the existing ieee 802.1Qav protocol, the time-determined forwarding and queuing functions designed using the time-aware shaper, priority queuing, and credit-based shaper algorithms are described. TC275 (Infineon) was used for functional implementation, and VN5620 (Vector) was used for data monitoring. Through the experimental process in the simulation environment, it was confirmed that the TAS algorithm transmits control data at intervals of 200ms and 500ms.
The proliferation of Internet of Things (IoT) has led to an exponential increase in network traffic, which has serious implications on energy utilization and network performance. For cloud data centres, a power-saving...
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