Rui Wang

Northeastern University

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i-10 index

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Qiuye Sun

Northeastern University

Dazhong Ma

Northeastern University

Peng Wang

Nanyang Technological University

Huaguang Zhang

State Key Laboratory of Synthetical Automation for Process Industries

Xinrui Liu

Shenyang Pharmaceutical University

Yonghao Gui

Oak Ridge National Laboratory

Xuguang Hu

Northeastern University

Chenghao Sun

Northeast Electric Power University

Chaoyu Dong

Shenzhen University

Qiuye Sun

Nanyang Technological University

Cooperative Institutions

Northeastern University

139

Chinese Academy of Sciences

109

Huazhong University of Science and Technology

Harbin Institute of Technology

Wuhan University

Zhejiang University

University of Chinese Academy of Sciences

Northwestern Polytechnical University

Xi'an Jiaotong University

Tsinghua University

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The Stability Analysis of a Multi-Port Single-Phase Solid-State Transformer in the Electromagnetic Timescale

Energies (2018)

Rui Wang Qiuye Sun Qifu Cheng Dazhong Ma

This paper proposes an overall practical stability assessment for a multi-port single-phase solid-state transformer (MS3T) in the electromagnetic timescale. When multiple stable subsystems are combined into one MS3T, the newly formed MS3T has a certain possibility to be unstable. Thus, this paper discusses the stability assessment of the MS3T in detail. First and foremost, the structure of the MS3T and its three stage control strategies are proposed. Furthermore, the stability analysis of each of the MS3T’s subsystems is achieved through the closed loop transfer function of each subsystem, respectively, including an AC-DC front-end side converter, dual active bridge (DAB) with a high-frequency (HF) or medium-frequency (MF) transformer, and back-end side incorporating DC-AC and dc-dc converters. Furthermore, the practical impedance stability criterion in the electromagnetic timescale, which only requires two current sensors and one external high-bandwidth small-signal sinusoidal perturbation current source, is proposed by the Gershgorin theorem and Kirchhoff laws. Finally, the overall stability assessment, based on a modified impedance criterion for the MS3T is investigated. The overall practical stability assessment of the MS3T can be validated through extensive simulation and hardware results.

Single phase

10.3390/en11092250

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Citations (9)

An Adaptive Optimal Control Algorithm for Jet Pipe Electro-hydraulic Servo Valve

Xiaochuang Liu Rui Wang Tao Sun Xian Du

In this paper, an adaptive optimal controller design method is proposed for the jet pipe electro-hydraulic servo valve. By establishing the dynamic model of the electro-hydraulic servo valve, the state variables and control variables are selected and transformed into the solution of the optimal control problem. Then based on adaptive dynamic programming (ADP) technology, which uses the state and online input information to iteratively solve the algebraic Riccati equation, the optimal control problem of the electro-hydraulic servo valve is solved. Finally, a simulation is given to demonstrate the effectiveness of the method in solving the optimal control problem of the electro-hydraulic servo valve of the jet tube.

Electrohydraulic servo valve

Algebraic Riccati equation

Servomechanism

10.23919/chicc.2019.8865709

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Citations (3)

Design and Realization of Precise Indoor Localization Mechanism for Wi-Fi Devices

KSII Transactions on Internet and Information Systems (2016)

Weideng Su Erwu Liu Anna Calveras Eduard García-Villegas Rui Wang

Despite the abundant literature in the field, there is still the need to find a time-efficient, highly accurate, easy to deploy and robust localization algorithm for real use.The algorithm only involves minimal human intervention.We propose an enhanced Received Signal Strength Indicator (RSSI) based positioning algorithm for Wi-Fi capable devices, called the Dynamic Weighted Evolution for Location Tracking (DWELT).Due to the multiple phenomena affecting the propagation of radio signals, RSSI measurements show fluctuations that hinder the utilization of straightforward positioning mechanisms from widely known propagation loss models.Instead, DWELT uses data processing of raw RSSI values and applies a weighted posterior-probabilistic evolution for quick convergence of localization and tracking.In this paper, we present the first implementation of DWELT, intended for 1D location (applicable to tunnels or corridors), and the first step towards a more generic implementation.Simulations and experiments show an accuracy of 1m in more than 81% of the cases, and less than 2m in the 95%.

Realization (probability)

10.3837/tiis.2016.12.016

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Citations (3)

Self-Adaptive Active Gate Driver for IGBT Switching Performance Optimization Based on Status Monitoring

IEEE Transactions on Power Electronics (2019)

Rui Wang Lin Liang Yu Chen Yan Pan Jingyuan Li

Compared to the conventional gate driver for the insulated gate bipolar transistor (IGBT), the active gate driver (AGD) not only reduces the switching delay but also suppresses voltage or current overshoot, however, at the expense of increasing the switching losses unavoidably. In this article, a self-adaptive active gate driver (SAGD) is proposed to further optimize IGBT switching performance, which is particularly suitable for applications where the load current varies over time or the dc bus voltage is changed. Since in such applications, AGD with fixed overshoot suppression ability will cause unnecessary switching loss, especially when the load current or the dc bus voltage is low. In contrast, with neither A/D nor D/A converters applied, the proposed SAGD indirectly detects the load current and dc bus voltage as time quantities, based on status monitoring, then self-adaptively chooses the optimal gate resistance increment online during the specific voltage or current rising phase. In this way, the current or voltage with overshoot is suppressed to be inside the safe operation area of IGBT while the switching loss is minimized, thus a better tradeoff between overshoots and switching losses is achieved. Finally, the feasibility of the proposed SAGD is verified by experiments.

Insulated-gate bipolar transistor

Overshoot (microwave communication)

Gate driver

Commutation

10.1109/tpel.2019.2947268

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Citations (26)

Conditional Lie-Bäcklund Symmetries and Differential Constraints of Radially Symmetric Nonlinear Convection-Diffusion Equations with Source

Entropy (2020)

Lina Ji Rui Wang

A conditional Lie-Bäcklund symmetry method and differential constraint method are developed to study the radially symmetric nonlinear convection-diffusion equations with source. The equations and the admitted conditional Lie-Bäcklund symmetries (differential constraints) are identified. As a consequence, symmetry reductions to two-dimensional dynamical systems of the resulting equations are derived due to the compatibility of the original equation and the additional differential constraint corresponding to the invariant surface equation of the admitted conditional Lie-Bäcklund symmetry.

10.3390/e22080873

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Citations (1)

Multi-dimensional flow simulation analysis and kriging-based optimization study on thermodynamic process mechanism of pulse tube refrigerator with displacer

Case Studies in Thermal Engineering (2024)

Yilin Wang Yu Yan Rui Wang Zhuo-qun Cao Zheng Cui

Pulse tube refrigerators with active displacers have become increasingly popular due to superior phase shift capability and avoidance of dissipation losses. However, mechanisms of thermodynamic processes within refrigerators due to variations in parameters related to critical structures and operations are not yet clear, making it difficult to optimize the comprehensive performance. In this paper, multi-dimensional flow simulation method instead of one-dimensional simulation method with poor computational accuracy is used to analyze the influence of five key parameters on performance of pulse tube refrigerators with active displacers. An intelligent optimization algorithm combined with efficient Kriging surrogate models is developed for single-objective and multi-objective optimization. Results demonstrate that the mean errors of the Kriging models for cooling capacity, total input power and performance coefficient are 1.81%, 3.94% and 3.37%. The single-objective optimization produces a maximum cooling capacity of 7.29 W and performance coefficient of 7.38%. The combined optimal solution delivers 6.65W in cooling capacity and 7.02% in performance coefficient, obtaining improvements of 150.94% and 75.94%. This study reveals the influence mechanism of key parameters on cooling performance of pulse tube refrigerators with displacers and establishes an efficient global optimization method, which is of great significance for the development of advanced refrigeration technology.

Pulse tube refrigerator

10.1016/j.csite.2024.104216

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Communication-Free Voltage-Regulation and Current-Sharing for DC Microgrids: An Intelligent Edge Control

IEEE Transactions on Systems Man and Cybernetics Systems (2023)

Rui Wang Junqi Liu Qiuye Sun Huaguang Zhang Xinrui Liu

Though voltage-regulation and current-sharing of distributed generations (DGs) in dc-microgrids have been widely studied, additional communication links or independent modulation circuit should be added to achieve information transmission. To accomplish precise current-sharing/voltage-regulation without additional communication devices, this article proposes a communication-free intelligent edge control regarding voltage and current for dc-microgrids. First, the power-information dual modulation (PIDM) is designed to achieve information exchange among DGs and eliminate additional communication devices. Second, the cooperative control problem with two coupled targets, i.e., accurate voltage-regulation and current-sharing, is converted into a matter of optimal control. Therefore, the voltage-regulation and current-sharing could be solved concurrently. In addition, the control objective function of each DG is switched to provide the optimal controller and minimize the voltage/current control deviation, which is further switched to solve the Hamilton–Jacobi–Bellman (HJB) function. In order to solve this HJB function, which is difficult to obtain analytical solution, an intelligent edge control strategy with PIDM is proposed to solve the HJB function. Therefore, the precise voltage-regulation and current-sharing can be accomplished. Finally, the proposed control approach is verified through simulation results.

Hamilton–Jacobi–Bellman equation

10.1109/tsmc.2023.3277560

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Citations (3)

Multiplayer Stackelberg Game-Based Intelligent Frequency Control of Power System With Line Loss Uncertainty

IEEE Transactions on Automation Science and Engineering (2024)

Xin Tong Dazhong Ma Rui Wang Qiuye Sun Huaguang Zhang

The power fluctuation and system inertia degradation in a short time put forward higher requirements on the rapidity and robustness of frequency control. This paper proposes an online multiplayer Stackelberg game control framework to achieve frequency control of multi-area power system with the uncertainties of load, renewable energy and line loss. Firstly, an optimal frequency control model incorporating efficient management of load aggregators (LA) is designed based on Stackelberg game, where the LA acts as the leader and all micro-turbines act as the followers. The two-level optimization problem of leader and followers is converted into solving the coupled Hamilton-Jacobi equations with the constraints of the follower’s costate equation. Then, an improved integral reinforcement learning is designed to enhance the wide adaptability of the control strategy online by introducing a general function with uncertainty upper bounds and line losses for all players, while satisfying the uniform ultimate bounded stability of the closed-loop system. A single critic neural network structure is utilized to obtain the optimal strategy. And the convergence of neural network weights is proven. Last, comparative simulation results verify the effectiveness of the proposed method. Note to Practitioners —High accuracy and robustness in frequency control of power systems is important for system safety. Demand-side participation in the interactive regulation of the system makes frequency control strategies more flexible and diversified. However, unreasonable control allocation schemes can incur large payment costs, while changes in control can cause dynamic changes in line losses to affect the supply-demand balance, leading to frequency deviations. This paper proposes an intelligent frequency control method based on the Stackelberg game. The designed IRL algorithm is able to solve the trade-off between system control performance and payment costs online without the priori knowledge of the system and with wide adaptability to uncertainty. Simulation results show that the proposed method outperforms non-game strategies and is robust.

Stackelberg competition

Robustness

10.1109/tase.2023.3347754

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Design of RLC Circuit Parameter and Fault Location Test Device

Journal of Physics Conference Series (2021)

Zihao Wang Rui Wang Kaiyu Wang

Abstract In order to improve the quality and performance of electronic equipment, circuit parameters and fault detection technology are also very important. The impedance value, which differs obviously under different input signals in the analog circuit, is also an important parameter. Through the analysis of this parameter, RLC circuit parameters and fault location detection can be realized. In this paper, STM32 is used as the main controller to control the signal source to generate sinusoidal signal. The signal processing is completed by designing the amplifier module, and the signal acquisition is completed by the digital to analog conversion module. In the controller, the impedance analysis, the measurement of component parameters, the detection of load network structure and the measurement of short-circuit point position are completed. Finally, the designed system was used to test different structural loads, and the detection results of component parameters, load network structure and short-circuit point position are accurate and reliable.

RLC circuit

SIGNAL (programming language)

10.1088/1742-6596/2085/1/012003

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SLR and GPS spatial techniques in ITRF. Argentine results.

IAU Joint Discussion (2012)

E. Actis Dongping Huang Raúl Márquez Sonia Adarvez Matías Flores

Source

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