Hui Yu

North Carolina State University

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Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Srdjan Lukic

North Carolina State University

Hao Tu

North Carolina State University

Iqbal Husain

North Carolina State University

M A Awal

North Carolina State University

Yuhua Du

Northwestern Polytechnical University

Md Rifat Kaisar Rachi

North Carolina State University

Ning Lü

North Carolina State University

Bei Xu

North Carolina State University

David Lubkeman

North Carolina State University

Stefan Schröder

Kiel University

Cooperative Institutions

North China Electric Power University

China Electric Power Research Institute

North Carolina State University

Huazhong University of Science and Technology

State Grid Corporation of China (China)

North Central State College

Chinese Academy of Sciences

Electric Power Research Institute

Shandong University

Zhejiang University

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Development of Leakage Current Monitoring Senors of MOV for URV/ERV Series Capacitors

2021 IEEE 5th Conference on Energy Internet and Energy System Integration (EI2) (2021)

Zhiyuan Li Mo Chen He Liu Wei Zhou Hui Yu

According to the requirements of monitoring high-voltage equipment and monitoring leakage current of MOVs in series capacitors, double core compensation methods was adopted in this paper, and large window or diameter of micro-current sensor was developed. The developed sensor coil has an outer diameter D=160mm, an inner diameter d=120mm, and a thickness H=10mm. The maximum measurement error is −2.9% in the range of 0.2mA to 5mA. It is difficult for the sensor to measure the current below 0.2mA, because of the interference of background noise. Using the same compensation circuit, the larger the diameter of sensor will be, the worse the measurement accuracy will be. The transient voltage suppressor (TVS) and thyristor surge protection device (TSPD) were adopted in the aspect of impulse current protection design. The test results showed that the sensor developed worked normally under the impact of 8/20µs1@10kA and 2mA@2.5kA square wave and after the test the measured amplitude was still accurate. The sensor presented various of transient processes under the impact of 8/20µs and 2ms square wave current. The sensor had certain ability of self-recovery and self-adjustment, and it can be restored to normal after about 120ms~ 165ms. The transient process of the sensor is related to the material, dimension of the core, coil turns and the dynamic characteristics of the compensation circuit.

Current sensor

Transient (computer programming)

Leakage (economics)

10.1109/ei252483.2021.9712958

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Citations (1)

Service restoration reconfiguration in distribution networks based on a multi-objective optimization algorithm

International Conference on Electrical and Control Engineering (2011)

Hui Yu Haitao Liu Jun Liu

In this paper, the service restoration problem has been formulated as a multi-objective, multi-constrained, and combinatorial optimization problem. The preferential knowledge of the various objective functions considered herein is known a priori. The first objective function (minimization of out-of-service area) has been kept at the first preference. The objective function of minimization of manually controlled switch operations has been kept at the second preference and that of minimization of remotely controlled switch operations has been kept at the third preference. Finally, the objective function of minimization of losses has been kept at the fourth preference. Moreover, a multi-objective optimization algorithm is applied in solving the service restoration problem in an electric power distribution system. In contrast to the single objective function optimization approach, it does good in solving conflicting objective functions and constraints in the service restoration problem. And due to the introduction of front formation and elitism, the approach has a faster speed and reduced complexity.

Minification

Control reconfiguration

10.1109/iceceng.2011.6057442

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Citations (4)

Hierarchical Control for Virtual Oscillator Based Grid-Connected and Islanded Microgrids

IEEE Transactions on Power Electronics (2019)

M A Awal Hui Yu Hao Tu Srdjan Lukic Iqbal Husain

Virtual oscillator control (VOC) is a nonlinear time domain controller that achieves significantly faster primary control response in islanded microgrids, compared to droop or virtual synchronous machine (VSM) control. Despite its superior performance, adoption of VOC is limited due to the lack of compatible secondary regulation or grid synchronization techniques. This is attributed to the nonlinear nature of VOC that complicates secondary control design, and the third-harmonic component in VOC output voltage that severely restricts grid-tied operation. To leverage the faster primary control response characteristics of VOC, we propose a compatible hierarchical control structure that enables operation and seamless transition between islanded and grid-connected modes. In the islanded mode, the controller achieves voltage and frequency regulation and grid synchronization; in the grid-tied mode, notch filters are used to suppress harmonic currents and tertiary level power reference tracking is achieved. The proposed controllers are validated through a series of real-time hardware-in-the-loop tests and hardware experiments using laboratory inverter prototype and state-of-the-art controls and communications hardware.

Hardware-in-the-loop simulation

10.1109/tpel.2019.2912152

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Citations (119)

Evaluation of the standardization needs of microgrids technology

Hui Yu Wenpeng Luan Wanxing Sheng Haitao Liu Wenyuan Ma

Microgrid has played a crucial role in solving problems caused by integration of distributed generation and therefore be comes an effective and efficient means for promoting renewable energy utilization and improving power supply reliability. This paper summarizes the key technologies and standardization needs for microgrid development and applications, based on the market needs and industry status. Some key features of a microgrid that distinguish it from traditional power grid and smart grid are de scribed. After review of the relevant activities currently under going in IEEE and IEC, recommendations for microgrid standardization based on the existing work are proposed.

10.1109/drpt.2015.7432604

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Citations (5)

A Study of Extended Interaction and Reliability of Distribution Networks with Multiple Demand-Side Resources

Frontiers in artificial intelligence and applications (2024)

Yuanhong Liu Yongmei Liu Hui Yu

This study aims to improve the reliability and economy of distribution networks, and proposes a multi demand side resource distribution network expansion interaction study. By analyzing the characteristics of energy supply and demand in industrial clusters, a bilevel programming model of distribution network expansion with high permeability DG is constructed. The results show that the absorption capacity of new energy is significantly improved by optimizing the absorption capacity of photovoltaic resources. Finally, the effectiveness of the method is verified by an actual distribution network, and the reliability index of the distribution network is evaluated. This study provides an important reference for distribution network planning and active distribution network, especially in demand response and reliability.

Demand side

10.3233/faia241143

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Citations (0)

Double Synchronous Unified Virtual Oscillator Control for Asymmetrical Fault Ride-Through in Grid-Forming Voltage Source Converters

IEEE Transactions on Power Electronics (2022)

M A Awal Md Rifat Kaisar Rachi Hui Yu Iqbal Husain Srdjan Lukic

In this work, a double synchronous unified virtual oscillator controller is proposed for grid-forming voltage source converters to achieve synchronization to the fundamental frequency positive- and negative-sequence components of unbalanced grid voltage without any phase-locked loop. The proposed controller leverages a positive-sequence virtual oscillator and a negative-sequence virtual oscillator, a double-sequence current reference generator, and a double-sequence vector limiter. Under fault conditions, the controller enables to limit the converter output current below/at the maximum value allowable by the converter hardware while retaining synchronization regardless of the nature of grid faults. Consequently, symmetrical and asymmetrical fault ride-through can be achieved without the need for switching to a backup controller. This article presents the implementation and detailed analysis of the double-synchronous structure, which enables simultaneous synchronization to both sequences during current-unconstrained and -constrained operations. Validation of the proposed controller is provided through laboratory hardware experiments.

10.1109/tpel.2022.3227729

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Citations (14)

A K-means-based Multi-subpopulation Particle Swarm Optimization for Neural Network Ensemble.

arXiv (Cornell University) (2019)

Hui Yu

This paper presents a k-means-based multi-subpopulation particle swarm optimization, denoted as KMPSO, for training the neural network ensemble. In the proposed KMPSO, particles are dynamically partitioned into clusters via the k-means clustering algorithm at every iteration, and each of the resulting clusters is responsible for training a component neural network. The performance of the KMPSO has been evaluated on several benchmark problems. Our results show that the proposed method can effectively control the trade-off between the diversity and accuracy in the ensemble, thus achieving competitive results in comparison with related algorithms.

Benchmark (surveying)

K-Means Clustering

Swarm intelligence

Component (thermodynamics)

Source

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Citations (0)

Research and Application of Comprehensive Evaluation Index System in Micro-Grid’s Construction and Operation

Applied Mechanics and Materials (2014)

Shan Shan Wu Peng Wang Li Yang Hui Yu

In order to evaluation the operation of micro-grid comprehensively, this paper builds an index system based on our current definitions and technical characteristics of the micro-grid. There are 20 base evaluation indexes and uses analytic hierarchy process (AHP) to explain the index system from both technical and economic aspects. Through using the index system to some real region, it has been proved reliably that the index system could reflect the advantages and disadvantages of micro-grid operation intuitively. The proposed indexes have been included State Grid Company of micro-grid technical standards.

10.4028/www.scientific.net/amm.672-674.1301

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Citations (0)

Research on Control System of Truss Manipulator and Inspection of Various Motion Mechanisms

Journal of Machinery Manufacture and Reliability (2024)

Xin Wang Qingyang Chen Hui Yu Zhihong Liu

Manipulator (device)

10.1134/s1052618824701334

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Citations (0)

Low-power interface circuits for bio-implantable microsystems

Hui Yu K. Najafi

Low-power interface circuits used in wireless bio-implantable microsystems are described. Regulators have line regulation of 3mV/V, load regulation of 8mV/mA, and ripple rejection of 45dB. An ASK demodulator achieves a bit rate of 60kb/s, and the frequency of the recovered clock reaches 10MHz. An on-chip active transmitter achieves a bit rate of 2Mb/s. Total power dissipation is 2.17mW for a 4.84mm/sup 2/ IC fabricated in 0.8/spl mu/m CMOS.

Microsystem

Interface (matter)

10.1109/isscc.2003.1234263

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Citations (80)