Imperial College London

ProfessorShuHui

Faculty of EngineeringDepartment of Electrical and Electronic Engineering

Chair in Power Electronics
 
 
 
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Contact

 

+44 (0)20 7594 6170r.hui

 
 
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Location

 

1108aElectrical EngineeringSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
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455 results found

Li K, Tan S-C, Hui SYR, 2021, Efficient Hybrid-Modulated Single-Stage Wireless Power Receiver With Continuous DC Current, IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 36, Pages: 13504-13514, ISSN: 0885-8993

Journal article

Yuan H, Li S, Tan SC, Hui SYRet al., 2021, Sensor Count Reduction for Single-Phase Converters with an Active Power Buffer Using Algebraic Observers, IEEE Transactions on Industrial Electronics, Vol: 68, Pages: 10666-10676, ISSN: 0278-0046

Single-phase power converters with an active pulsating power buffer (PPB) have many advantages, such as enabling electrolytic-capacitor-free design and simultaneous high power density and high efficiency. However, this new type of converter generally requires more sensors than converters without a PPB due to the additional PPB circuitry. Requiring an excessive number of sensors largely compromises the power density, reliability, and cost of the overall system. Unfortunately, the high-sensor-count issue of single-phase converters with a PPB is seldom discussed in literature. In this article, an algebraic-estimation-based method is proposed to solve this high-sensor-count problem. Specifically, a general theory of employing algebraic observers to reduce the number of sensors is developed. Comprehensive analysis, design, and optimization of the algebraic observers in both continuous and discrete time domain are also provided. Then, the proposed method is applied to a typical single-phase rectifier with a PPB and is verified with simulation and experiments.

Journal article

Yuan H, Li S, Tan S-C, Hui RS-Yet al., 2021, Simplified Algebraic Estimation Technique for Sensor Count Reduction in Single-Phase Converters With an Active Power Buffer, IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 36, Pages: 11444-11455, ISSN: 0885-8993

Journal article

Wu J, Li S, Tan S-C, Hui SYRet al., 2021, Capacitor-Clamped LLC Resonant Converter Operating in Capacitive Region for High-Power-Density EV Charger, IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 36, Pages: 11456-11468, ISSN: 0885-8993

Journal article

Jiang Y, Yang Y, Tan S-C, Hui S-YRet al., 2021, Distribution Power Loss Mitigation of Parallel-Connected Distributed Energy Resources in Low-Voltage DC Microgrids Using a Lagrange Multiplier-Based Adaptive Droop Control, IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 36, Pages: 9105-9118, ISSN: 0885-8993

Journal article

Li K, Lee ATL, Tan SC, Hui RSYet al., 2021, Highly Efficient Single-Switch-Regulated Resonant Wireless Power Receiver with Hybrid Modulation, IEEE Journal of Emerging and Selected Topics in Power Electronics, Vol: 9, Pages: 3770-3780, ISSN: 2168-6777

In this article, a highly efficient single-switch-regulated resonant wireless power receiver with hybrid modulation is proposed. To achieve both high efficiency and good output voltage regulation, phase shift and pulsewidth hybrid modulation are simultaneously applied. The soft switching operation in this topology is achieved by the cycle-by-cycle phase shift adjustment between the input current and the gate drive signal and also attributed to the reactive components such as the series-compensated secondary coil ( L_{s} , C_{s} ) and the parasitic capacitor of the active switch ( C_{s1} ). The soft switching operation also leads to high efficiency and low electromagnetic interference (EMI). By adjusting the duty ratio of the switch, tight regulation of the output voltage can be attained. The steady-state and dynamic models of the resonant receiver with hybrid modulation are analytically derived in order to properly design the feedback controller. An experimental setup of a two-coil wireless power transfer (WPT) system, including the hardware prototype of the proposed receiver, is constructed for experimental verification. The experimental results show the effectiveness of the soft-switching operation in the receiver with a maximum ac-dc efficiency of 98% while maintaining good regulation of the output voltage, regardless of line and load variations.

Journal article

Li K, Tan S-C, Hui RSY, 2021, ON Effect of Right-Half-Plane Zero Present in Buck Converters With Input Current Source in Wireless Power Receiver Systems, IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 36, Pages: 6364-6374, ISSN: 0885-8993

Journal article

Li K, Tan SC, Hui RSY, 2021, Low-Cost Single-Switch Bidirectional Wireless Power Transceiver for Peer-to-Peer Charging, IEEE Journal of Emerging and Selected Topics in Power Electronics, Vol: 9, Pages: 3781-3790, ISSN: 2168-6777

A single-switch bidirectional wireless power transceiver aiming at cost-effective and reliable peer-to-peer charging applications is proposed. The transceiver comprises a single-switch resonant power circuit, a frequency synchronization circuit, and a microcontroller. It can operate in either transmitter mode or receiver mode. As a transceiver, the required number of semiconductor devices is minimized, i.e., only single active switch is used. This makes it easy to implement and is relatively reliable and cost-effective. The bidirectional power flow and dc output regulation are achieved solely by adjusting the phase shift ratio of the control signal. To make the phase shift power control feasible and to secure wide operating range ZVS operation, a holistic design method is provided such that the ac voltage waveforms remain relatively constant and independent of the coupling and the phase shift ratio changes. The operating principles, steady-state and dynamic models, and design considerations are discussed. Simulation and experiments are performed on a prototype based on the design. The results validate the features of relatively constant ac voltage waveforms of the transceiver, the effectiveness of the time-domain model, the ZVS turn on and turn off operations over wide operating power range, phase shift regulated transmission power control, bidirectional power flow, and accurate output regulation.

Journal article

Jiang Y, Yang Y, Tan S-C, Hui SYet al., 2021, Distributed Sliding Mode Observer-Based Secondary Control for DC Microgrids Under Cyber-Attacks, IEEE JOURNAL ON EMERGING AND SELECTED TOPICS IN CIRCUITS AND SYSTEMS, Vol: 11, Pages: 144-154, ISSN: 2156-3357

Journal article

Zhong W, Li H, Hui SYR, Xu MDet al., 2021, Current Overshoot Suppression of Wireless Power Transfer Systems With ON-OFF Keying Modulation, IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 36, Pages: 2676-2684, ISSN: 0885-8993

Journal article

Liang HWR, Wang H, Lee C-K, Hui SYRet al., 2021, Analysis and Performance Enhancement of Wireless Power Transfer Systems With Intended Metallic Objects, IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 36, Pages: 1388-1398, ISSN: 0885-8993

Journal article

Ying H, Lee ATL, Tan S-C, Hui SYet al., 2021, Highly Efficient Wireless Power Transfer System With Single-Switch Step-Up Resonant Inverter, IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS, Vol: 9, Pages: 1157-1168, ISSN: 2168-6777

Journal article

Yan Z, Huang Y, Jiang C, Mei Y, Tan S-C, Tang CY, Hui SYet al., 2021, A Generalized Reverse-Electrodialysis Model Incorporating Both Continuous and Recycle Modes for Energy Harvesting From Salinity Gradient Power, IEEE ACCESS, Vol: 9, Pages: 71626-71637, ISSN: 2169-3536

Journal article

Li K, Tan S-C, Hui RSY, 2020, On Beat Frequency Oscillation of Two-Stage Wireless Power Receivers, IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 35, Pages: 12741-12751, ISSN: 0885-8993

Journal article

Liang HWR, Lee C-K, Hui SYR, 2020, Design, Analysis, and Experimental Verification of a Ball-Joint Structure With Constant Coupling for Capacitive Wireless Power Transfer, IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS, Vol: 8, Pages: 3582-3591, ISSN: 2168-6777

Journal article

Chen T, Zheng Y, Chaudhuri B, Hui SYRet al., 2020, Distributed electric-spring-based smart thermal loads for overvoltage prevention in LV distributed network using dynamic consensus approach, IEEE Transactions on Sustainable Energy, Vol: 11, Pages: 2098-2108, ISSN: 1949-3029

Overvoltage arising from reverse power flow in low-voltage (LV) distribution network caused by surplus roof-top photovoltaic (PV) energy generation is a major challenge in the emerging smart grid. This paper reports a study on the use of distributed thermal Smart Loads (SLs) for overvoltage prevention along a LV feeder. The basic principle involves the combined use of electric springs (ESs) and storage-type electric water heaters (EWHs) as distributed smart loads. Through distributed control, these smart loads play the important roles of mitigating reverse power flow problems and maintaining local mains voltage within the specified tolerance. Detailed modeling of the combined ES and EWH including their practical electrical and thermal capacities and constraints is adopted and optional distributed energy storage system (ESS) is also considered in the evaluation. Based on the Sha Lo Bay residential LV network in Lantau Island, Hong Kong, these case studies confirm the feasibility of the proposed approach for overvoltage prevention. The proposed distributed SLs-plus-ESS method is proved to be a cost-effective and environmental friendly way for overvoltage prevention in LV distributed network with high PV penetration.

Journal article

Yang Y, Qin Y, Tan S-C, Hui SYRet al., 2020, Reducing Distribution Power Loss of Islanded AC Microgrids Using Distributed Electric Springs With Predictive Control, IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, Vol: 67, Pages: 9001-9011, ISSN: 0278-0046

Journal article

Yang Y, Tan SC, Hui SYR, 2020, Fast Hardware Approach to Determining Mutual Coupling of Series-Series-Compensated Wireless Power Transfer Systems With Active Rectifiers, IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 35, Pages: 11026-11038, ISSN: 0885-8993

Journal article

Jin W, Lee ATL, Tan S-C, Hui SYRet al., 2020, Single-Inductor Multiple-Output Inverter With Precise and Independent Output Voltage Regulation, IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 35, Pages: 11222-11234, ISSN: 0885-8993

Journal article

Guo J, Tong C, Chaudhuri B, Hui Set al., 2020, Stability of isolated microgrids with renewable generation and smart loads, IEEE Transactions on Sustainable Energy, Vol: 11, Pages: 2845-2854, ISSN: 1949-3029

This paper investigates the low frequency (< 30 Hz) oscillations in isolated microgrids (IMGs) with smart loads (SLs) alongside converter-interfaced distributed generators (CDGs) fuelled by renewable energy resources (e.g. wind, solar) with battery energy storage. In an IMG with normal loads (active or passive), such oscillations are typically associated with the droop control of the CDGs operating in grid forming mode. This paper shows that SLs have marginal influence on these low frequency oscillations but introduce a new oscillatory mode at a slightly higher frequency (>20 Hz). First, the stability analysis model (linearized state-space model) of an IMG is extended to include the dynamics of a smart load with a series-shunt converter arrangement in its voltage compensator. It is shown that the dynamics of the phase-locked loop (PLL), DC link along with the control loops of the series and shunt converters of the smart load dictates the lower limit of its droop gain for stable operation. This is not apparent from the simplified SL models (i.e. neglecting the dynamics of the shunt converter and DC link) reported previously. Impact of smart loads on low frequency oscillations in IMGs is demonstrated in this paper through stability analysis and time domain simulation.

Journal article

Qin Y, Yang Y, Li S, Huang Y, Tan S-C, Hui SYet al., 2020, A High-Efficiency DC/DC Converter for High-Voltage-Gain, High-Current Applications, IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS, Vol: 8, Pages: 2812-2823, ISSN: 2168-6777

Journal article

Chen T, Guo J, Chaudhuri B, Hui Set al., 2020, Virtual inertia from smart loads, IEEE Transactions on Smart Grid, Vol: 11, Pages: 4311-4320, ISSN: 1949-3053

The inertia of future power systems is expected todecrease with increasing penetration of renewable energyresources. Sufficient inertia is required to avoid large fluctuationsin grid frequency and also limit the excessive rate of change offrequency (RoCoF). Unlike many previous works focusing onvirtual inertia on the power supply side, this paper studies andquantifies potential virtual inertia from the load side. The analysisshows that, voltage-dependent loads coupled with electric spring(ES) technology can be operated as smart loads (SL) within the +/-5% tolerance of the ac mains voltage and offer virtual inertia.Following the U.K. National Grid frequency requirements, it isshown that the ES based SL can provide virtual inertia up to aninertia coefficient of HSL=2.5 s (when np=2) with respect to its loadpower rating. The effectiveness of such virtual inertia extractionfrom SL has been verified by the simulation study on a CIGREbenchmark microgrid with high-resolution domestic demandmodel. The value of HSL is shown to be around 1.3 s during themost part of the day and can increase the overall system inertiacoefficient by 0.53 s if all the domestic loads are transformed intothe proposed smart loads.

Journal article

Liu H, Ng WM, Lee C-K, Hui SYRet al., 2020, Integration of Flexible Loads and Electric Spring Using a Three-Phase Inverter, IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 35, Pages: 8013-8024, ISSN: 0885-8993

Journal article

Li K, Tan SC, Hui RSY, 2020, Single-Stage Regulated Resonant WPT Receiver With Low Input Harmonic Distortion, IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 35, Pages: 6820-6829, ISSN: 0885-8993

Journal article

Lee CK, Liu H, Tan S-C, Chaudhuri B, Hui Set al., 2020, Electric spring and smart load: technology, system-level impact and opportunities, IEEE journal of emerging and selected topics in power electronics, ISSN: 2168-6777

Increasing use of renewable energy sources to combat climate change comes with the challenge of power imbalance and instability issues in emerging power grids. To mitigate power fluctuation arising from the intermittent nature of renewables, electric spring has been proposed as a fast demand-side management technology. Since its original conceptualization in 2011, many versions and variants of electric springs have emerged and industrial evaluations have begun. This paper provides an update of existing electric spring topologies, their associated control methodologies, and studies from the device level to the power system level. Future trends of electric springs in large-scale infrastructures are also addressed.

Journal article

Guo J, Badesa Bernardo L, Teng F, Chaudhuri B, Hui S, Strbac Get al., 2020, Value of point-of-load voltage control for enhanced frequency response in future GB power system, IEEE Transactions on Smart Grid, Vol: 11, Pages: 4938-4948, ISSN: 1949-3053

The need for Enhanced Frequency Response (EFR)is expected to increase significantly in future low-carbon GreatBritain (GB) power system. One way to provide EFR is touse power electronic compensators (PECs) for point-of-loadvoltage control (PVC) to exploit the voltage dependence of loads.This paper investigates the techno-economic feasibility of suchtechnology in future GB power system by quantifying the totalEFR obtainable through deploying PVC in the urban domesticsector, the investment cost of the installment and the economicand environmental benefits of using PVC. The quantificationis based on a stochastic domestic demand model and genericmedium and low-voltage distribution networks for the urbanareas of GB and a stochastic unit commitment (SUC) modelwith constraints for secure post-fault frequency evolution is usedfor the value assessment. Two future energy scenarios in thebackdrop of 2030 with ‘smart’ and ‘non-smart’ control of electricvehicles and heat pumps, under different levels of penetration ofbattery energy storage system (BESS) are considered to assessthe value of PEC, as well as the associated payback period. Itis demonstrated that PVC could effectively complement BESStowards EFR provision in future GB power system.

Journal article

Li KH, Cheung YF, Jin W, Fu WY, Lee ATL, Tan SC, Hui SY, Choi HWet al., 2020, InGaN RGB Light-Emitting Diodes With Monolithically Integrated Photodetectors for Stabilizing Color Chromaticity, IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, Vol: 67, Pages: 5154-5160, ISSN: 0278-0046

Journal article

Chen T, Liu H, Lee C-K, Hui SYRet al., 2020, A Generalized Controller for Electric-Spring-Based Smart Load With Both Active and Reactive Power Compensation, IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS, Vol: 8, Pages: 1454-1465, ISSN: 2168-6777

Journal article

Yan S, Chen J, Tan S-C, Hui SYRet al., 2020, A New Geometric Vector Optimization of Predictive Direct Power Control, IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 35, Pages: 5427-5436, ISSN: 0885-8993

Journal article

Wang M-H, Yan S, Tan S-C, Xu Z, Hui SYet al., 2020, Decentralized Control of DC Electric Springs for Storage Reduction in DC Microgrids, IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 35, Pages: 4634-4646, ISSN: 0885-8993

Journal article

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