Chengkai Liu
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View article: DiNAT-IR: Exploring Dilated Neighborhood Attention for High-Quality Image Restoration
DiNAT-IR: Exploring Dilated Neighborhood Attention for High-Quality Image Restoration Open
Transformers, with their self-attention mechanisms for modeling long-range dependencies, have become a dominant paradigm in image restoration tasks. However, the high computational cost of self-attention limits scalability to high-resoluti…
View article: CrisisSense-LLM: Instruction Fine-Tuned Large Language Model for Multi-label Social Media Text Classification in Disaster Informatics
CrisisSense-LLM: Instruction Fine-Tuned Large Language Model for Multi-label Social Media Text Classification in Disaster Informatics Open
In the field of crisis/disaster informatics, social media is increasingly being used for improving situational awareness to inform response and relief efforts. Efficient and accurate text classification tools have been a focal area of inve…
View article: DeblurDiNAT: A Compact Model with Exceptional Generalization and Visual Fidelity on Unseen Domains
DeblurDiNAT: A Compact Model with Exceptional Generalization and Visual Fidelity on Unseen Domains Open
Recent deblurring networks have effectively restored clear images from the blurred ones. However, they often struggle with generalization to unknown domains. Moreover, these models typically focus on distortion metrics such as PSNR and SSI…
View article: Index
Index Open
convolutional neural networks a ABB 286 abnormal gate driver 105 AC CB protection 274 AC circuit breaker (CB) 273, 274, 277, 279, 297 AC fault current interruption operation 314 AC see alternating currrent accumulation over a number of fun…
View article: Multi-Behavior Sequential Transformer Recommender
Multi-Behavior Sequential Transformer Recommender Open
In most real-world recommender systems, users interact with items in a sequential and multi-behavioral manner. Exploring the fine-grained relationship of items behind the users' multi-behavior interactions is critical in improving the perf…
View article: Power Loss Reduction Control for Modular Multilevel Converters Based on Resistor Controllable Submodule
Power Loss Reduction Control for Modular Multilevel Converters Based on Resistor Controllable Submodule Open
A bleeding resistor is usually adopted to be parallel with the capacitor in the submodule (SM) to avoid static voltage imbalance caused by auxiliary power supply during start-up process of modular multilevel converters (MMCs). However, the…
View article: Advanced 2<i>N</i>+1 Submodule Unified PWM With Reduced DC-Link Current Ripple for Modular Multilevel Converters
Advanced 2<i>N</i>+1 Submodule Unified PWM With Reduced DC-Link Current Ripple for Modular Multilevel Converters Open
The 2 N +1 submodule unified pulsewidth modulation (SUPWM) is attractive for modular multilevel converters (MMCs). To generate 2 N +1 voltage levels, the SUPWM results in voltage pulses imposed on the arm inductors, which produces large hi…
View article: Temperature-Balancing Control for Modular Multilevel Converters Under Unbalanced Grid Voltages
Temperature-Balancing Control for Modular Multilevel Converters Under Unbalanced Grid Voltages Open
The modular multilevel converter (MMC) is attractive for medium-voltage and high-power applications because of the advantages of its high modularity, availability, and high power quality. Due to unbalanced grid voltages, the arm current am…
View article: Submodule Open-Circuit Fault Detection For Modular Multilevel Converters Under Light Load Condition With Rearranged Bleeding Resistor Circuit
Submodule Open-Circuit Fault Detection For Modular Multilevel Converters Under Light Load Condition With Rearranged Bleeding Resistor Circuit Open
Fault detection is one of the important issues for the modular multilevel converter (MMC). However, few have studied the fault detection of MMCs under light load condition, where the faulty submodules’ (SMs’) capacitor voltages and healthy…
View article: Harmonic circulating current injection based power losses optimization control of bottom switch/diode for modular multilevel converters
Harmonic circulating current injection based power losses optimization control of bottom switch/diode for modular multilevel converters Open
Power losses management is one of the most significant challenges for reliability improvement of modular multilevel converters (MMCs). In the MMC, the bottom switch/diode in each submodule (SM) normally takes the maximum power loss. In thi…
View article: Double Half-Bridge Submodule-Based Modular Multilevel Converters With Reduced Voltage Sensors
Double Half-Bridge Submodule-Based Modular Multilevel Converters With Reduced Voltage Sensors Open
The half-bridge (HB) submodule (SM) based MMC requires a large number of sensors to measure capacitor voltages. In this letter, a double half-bridge (DHB) SM based MMC is proposed, where each SM consists of two HBs. But only one voltage se…
View article: Overview on submodule topologies, modeling, modulation, control schemes, fault diagnosis, and tolerant control strategies of modular multilevel converters
Overview on submodule topologies, modeling, modulation, control schemes, fault diagnosis, and tolerant control strategies of modular multilevel converters Open
In the present scenario, modular multilevel converters (MMCs) are considered to be one of the most promising and effective topologies in the family of high-power converters because of their modular design and good scalability; MMCs are ext…
View article: Circulating current suppression method for MMC-HVDC systems with asymmetric arm impedance
Circulating current suppression method for MMC-HVDC systems with asymmetric arm impedance Open
The modular multilevel converter (MMC) has been a highly promising topology in the high-voltage direct-current (HVDC) transmission area, where each arm of the MMC may consist of hundreds of series-connected submodules and an inductor. Due …
View article: A Currentless Submodule Individual Voltage Balancing Control for Modular Multilevel Converters
A Currentless Submodule Individual Voltage Balancing Control for Modular Multilevel Converters Open
The capacitor voltage balancing is one of the most important issues for safe and reliable operation of the modular multilevel converters (MMC). This article proposes a currentless submodule individual voltage balancing control (SMIVBC) to …
View article: Capacitor ESR and <i>C</i> Monitoring in Modular Multilevel Converters
Capacitor ESR and <i>C</i> Monitoring in Modular Multilevel Converters Open
The capacitor is one of the weakest components in the modular multilevel converter (MMC). The rise of equivalent series resistance (ESR) is a prominent character to monitor the lapsed capacitor, but current research works only focus on cap…
View article: Thyristor‐based modular multilevel converter‐HVDC systems with current interruption capability
Thyristor‐based modular multilevel converter‐HVDC systems with current interruption capability Open
The modular multilevel converter (MMC) is an attractive option for high‐voltage direct‐current (HVDC) transmission applications. The dc line short‐circuit fault is one of the key challenges for the HVDC system. In this study, a thyristor‐b…
View article: Power Losses Control for Modular Multilevel Converters Under Capacitor Deterioration
Power Losses Control for Modular Multilevel Converters Under Capacitor Deterioration Open
The modular multilevel converter (MMC) is attractive for medium-/high-voltage and high-power applications because of the advantages of its high modularity, availability, and high power quality. Due to the chemical process, aging effect, et…