Publications
496 results found
Li K, Yuan H, Tan SC, et al., 2022, Overshoot Damping and Dynamics Improvement in Wireless Power Transfer Systems Via Receiver-Side Controller Design, IEEE Transactions on Power Electronics, Vol: 37, Pages: 2362-2371, ISSN: 0885-8993
Buck converters have been extensively used for output regulation in the receiver of series-series compensated wireless power transfer (WPT) systems. Nonetheless, there are two major challenges in the controller design of this class of WPT systems. First, due to the current-source nature and finite dc-link capacitance, a right-half-plane (RHP) zero exists in the WPT receiver, reducing its stability margin and causing limited system dynamics. Second, this RHP zero can cause an overshoot issue in the WPT system. Without proper treatment, this overshoot may largely increase the voltage/current stress of the system and even cause catastrophic failure. However, existing solutions to the above two issues suffer from long communication delays or significantly compromised output regulation, degrading system performance. In this article, the slow dynamics and the overshoot issue of the WPT system are elaborated in theory and a solution is proposed by adding a feedforward path of the dc-link voltage in the receiver's controller. No communication is involved in the proposed control method, and only trivial computation is added to the controller. The proposed method is examined on a WPT prototype. The experimental results show that the two issues of the WPT system can be simultaneously solved by the proposed method while the output regulation of the system is not compromised.
Fang Y, Qu J, Pong BMH, et al., 2022, Quasi-Static Modeling and Optimization of Two-Layer PCB Resonators in Wireless Power Transfer Systems for 110-kV Power Grid Online Monitoring Equipment, IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, Vol: 69, Pages: 1400-1410, ISSN: 0278-0046
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- Citations: 13
Chen J, Gallo AJ, Yan S, et al., 2022, Cyber-attack detection and countermeasure for distributed electric springs for smart grid applications, IEEE Access, Vol: 10, Pages: 13182-13192, ISSN: 2169-3536
With increasing installations of grid-connected power electronic converters in the distribution network, there is a new trend of using distributed control in a cyber layer to coordinate the operations of these power converters for improving power system stability. However, cyber-attacks remain a threat to such distributed control. This paper addresses the cyber-attack detection and a countermeasure of distributed electric springs (ESs) that have emerged as a fast demand-response technology. A fully distributed model-based architecture for cyber-attack detection in the communication network is developed. Based on a dynamic model of ES with consensus control, a local state estimator is proposed and practically implemented to monitor the system. The estimator is fully distributed because only local and neighboring information is necessary. A countermeasure for the distributed ESs to ride through the cyber-attack and maintain regulatory services in a microgrid is demonstrated successfully. Experimental results are provided to verify the effectiveness of the proposed cyber-attack detection method and its ride-through capability.
Wong CPG, Lee ATL, Li K, et al., 2022, Precise Luminous Flux and Color Control of Dimmable Red-Green-Blue Light-Emitting Diode Systems, IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 37, Pages: 588-606, ISSN: 0885-8993
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- Citations: 4
Wang H, Zhang C, Yang Y, et al., 2022, A Comparative Study on Overall Efficiency of Two-Dimensional Wireless Power Transfer Systems Using Rotational and Directional Methods, IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, Vol: 69, Pages: 260-269, ISSN: 0278-0046
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- Citations: 15
Lee CK, Liu H, Tan S-C, et al., 2021, Electric spring and smart load: technology, system-level impact and opportunities, IEEE journal of emerging and selected topics in power electronics, Vol: 9, Pages: 6524-6544, 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.
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
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- Citations: 4
Yuan H, Li S, Tan S-C, et 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
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- Citations: 3
Li K, Tan S-C, Hui R, 2021, Dynamic Response and Stability Margin Improvement of Wireless Power Receiver Systems via Right-Half-Plane Zero Elimination, IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 36, Pages: 11196-11207, ISSN: 0885-8993
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- Citations: 3
Wu J, Li S, Tan S-C, et al., 2021, Capacitor-Clamped <i>LLC</i> 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
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- Citations: 5
Yuan H, Li S, Tan S-C, et 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
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- Citations: 7
Jiang Y, Yang Y, Tan S-C, et 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
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- Citations: 18
Li K, Tan S-C, 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
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- Citations: 4
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
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- Citations: 8
Li K, Lee ATL, Tan S-C, et 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
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- Citations: 2
Zhong W, Li H, Hui SYR, et 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
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- Citations: 14
Jiang Y, Yang Y, Tan S-C, et 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
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- Citations: 20
Ying H, Lee ATL, Tan S-C, et 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
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- Citations: 6
Liang HWR, Wang H, Lee C-K, et 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
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- Citations: 6
Yang Y, Liang HWR, Tan SC, et al., 2021, Design of A Wireless Power Modulator for Wireless Power Transfer Systems, 12th IEEE Energy Conversion Congress and Exposition-Asia (ECCE-Asia), Publisher: IEEE, Pages: 816-820, ISSN: 2150-6078
Yang Y, Tan S-C, Hui SYR, 2021, State-of-Charge Balance Control of Distributed Battery Systems with Distinct State-of-Health in DC Microgrids, IEEE IAS Conference on Industrial and Commercial Power System Asia (IEEE I and CPS Asia), Publisher: IEEE, Pages: 140-144
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- Citations: 6
Yan Z, Huang Y, Jiang C, et 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
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
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- Citations: 10
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
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- Citations: 12
Chen T, Zheng Y, Chaudhuri B, et 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.
Guo J, Tong C, Chaudhuri B, et 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.
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
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- Citations: 23
Jin W, Lee ATL, Tan S-C, et 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
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- Citations: 2
Yang Y, Qin Y, Tan S-C, et 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
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- Citations: 26
Chen T, Guo J, Chaudhuri B, et 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.
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