Publications
476 results found
Zhou J, Li Z, Lee CK, et al., 2023, A Weather-Independent and Renewable Power Supply With Wireless Power Transfer Feature for Powering Online Monitoring Systems in Smart Grid, IEEE Transactions on Industrial Electronics, Vol: 70, Pages: 6414-6424, ISSN: 0278-0046
The merge of the power and information infrastructures in the smart grid requires an increasing number of sensors and online monitoring systems on the high-voltage transmission towers. These systems are traditionally powered by small solar panels or wind turbines that are weather-dependent. This new contribution involves a full analysis of a complete weather-independent power supply to replace existing approaches. For the first time, the complete system comprising the energy harvesting, wireless power transfer (WPT) and output power stages are practically evaluated using printed circuit board (PCB) resonators embedded in a 35-kV composite insulator. We leverage the nearly constant current, transresistance, and voltage gains characteristics of the PCB domino-resonator structure under different self-oscillating frequencies and propose a coordinated control scheme of transmitter-side and receiver-side converters to regulate the constant current (CC) or constant voltage (CV) through the entire charging process. Any current surge caused by the burst operation of the active rectifier on the receiver side triggers a transition between different self-oscillating operations on the transmitter side, leading to operating region extension of the active rectifier. Thus, the proposed system can easily adjust the output to follow different battery charging profiles without wireless communication between the transmitter and receiver.
Wu J, Li S, Tan SC, et al., 2023, Frequency Folding for LLC Resonant Converters in EV Charging Applications, IEEE Transactions on Power Electronics, Vol: 38, Pages: 5041-5054, ISSN: 0885-8993
To realize a wide voltage variation of electric vehicles (EV) battery packs, the conventional LLC converter needs to operate over a wide frequency range, which generally complicates the magnetics design and decreases the efficiency when the operating frequency is far away from the resonant frequency. Responding to the challenge, a frequency folding technique is proposed and explained with an exemplary new LLC converter. The proposed converter utilizes both the inductive region and the capacitive region of the conventional LLC converter through a one-shot operation of the relay during the whole charging process. As the battery voltage increases, the converter switches from the capacitive region to the inductive region. Throughout the charging process, the operating frequency is effectively reduced, and zero-voltage switching is maintained, resulting in a relatively higher overall efficiency. A detailed description on the design procedure of the proposed converter is described. A scaled-down 400-W prototype with 200 V input and 120 V-210 V output range verified the advantages of the proposed concept and measured efficiency of 98% at the maximum output power.
Yan Z, Huang Y, Tan S-C, et al., 2023, A Self-Adaptive-Step-Size Incremental-Resistance-MPPT Technique for Reverse-Electrodialysis System, IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, Vol: 70, Pages: 3814-3824, ISSN: 0278-0046
Li K, Tan S-C, Hui SYR, 2022, Interleaved Buck-Type Rectifier With Pseudo-DC-Link Capacitors for Automatic Current Balancing, IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, Vol: 69, Pages: 12676-12687, ISSN: 0278-0046
Lam HS, Yuan H, Tan S-C, et al., 2022, Bidirectional AC-DC Modular Multilevel Converter With Electric Spring Functions for Stabilizing Renewable AC Power Grid at the Distribution Voltage Level, IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS, Vol: 10, Pages: 7589-7600, ISSN: 2168-6777
Zeng J, Chen S, Yang Y, et al., 2022, A Primary-Side Method for Ultrafast Determination of Mutual Coupling Coefficient in Milliseconds for Wireless Power Transfer Systems, IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 37, Pages: 15706-15716, ISSN: 0885-8993
Wu J, Li S, Tan S-C, et al., 2022, Fixed-Frequency Phase-Shift Modulated Capacitor-Clamped LLC Resonant Converter for EV Charging, IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 37, Pages: 13730-13742, ISSN: 0885-8993
Jiang Y, Yang Y, Tan S-C, et al., 2022, Power Loss Minimization of Parallel-Connected Distributed Energy Resources in DC Microgrids Using a Distributed Gradient Algorithm-Based Hierarchical Control, IEEE TRANSACTIONS ON SMART GRID, Vol: 13, Pages: 4538-4550, ISSN: 1949-3053
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- Citations: 1
Beniwal N, Farivar GG, Lam HS, et al., 2022, Dual-Layer Pulsewidth Modulation Technique for Average Neutral Point Current Control in Neutral-Point-Clamped Converters, IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 37, Pages: 11762-11773, ISSN: 0885-8993
Lam HS, Li P, Chen B, et al., 2022, Exponential modulation integral observer for online detection of the fundamental and harmonics in grid-connected power electronics equipment, IEEE Transactions on Control Systems Technology, Vol: 30, Pages: 1821-1833, ISSN: 1063-6536
Harmonic current estimation is required in active power filters for compensation purposes. The most efficient way of calculating the total harmonic current up to the infinite order is to subtract the fundamental component from the distorted current. Direct determination of the fundamental component of a distorted current of mains frequency was realized recently with a third-order modulation integral observer. This article shows that using an exponential modulation function (Exp-MF) for the integral observer will: 1) significantly enhance the robustness of the observer against noise and 2) automatically remove the low-frequency envelope arising from the D/A and A/C sampling processes compared to previous polynomial modulation function. These new and advantageous features are supported with detailed analysis and experimental verification. The robust observer can be implemented in grid-connected power electronics circuits that require the instantaneous information of the fundamental and/or harmonic currents. Practical comparative tests with the adaptive notch filter and recursive discrete Fourier transform (DFT) methods in an active power filter have confirmed the good performance under both the steady and dynamic states of the proposed Exp-MF integral observer.
Jiang Y, Yang Y, Tan S-C, et al., 2022, A High-Order Differentiator Based Distributed Secondary Control for DC Microgrids Against False Data Injection Attacks, IEEE TRANSACTIONS ON SMART GRID, Vol: 13, Pages: 4035-4045, ISSN: 1949-3053
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- Citations: 3
Li H, Li S, Xiao W, et al., 2022, A Modulation Method for Capacitance Reduction in Active-Clamp Flyback-Based AC-DC Adapters, IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 37, Pages: 9455-9467, ISSN: 0885-8993
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- Citations: 1
Liang H-WR, Yang Y, Hui SYR, 2022, Improvement of Lithium-Ion Battery Charging From the State-of-the-Art Industrial JEITA Guidelines to a Hybrid Temperature-Regulated Current Control, IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 37, Pages: 6412-6423, ISSN: 0885-8993
Lee ATL, Jin W, Tan S-C, et al., 2022, Single-Inductor Multiple-Output (SIMO) Buck Hybrid Converter for Simultaneous Wireless and Wired Power Transfer, IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS, Vol: 10, Pages: 2163-2177, ISSN: 2168-6777
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- Citations: 4
Yan S, Hui SYR, 2022, A Simple Multi-Vector Predictive Direct Power Control Using Geometric Modulation, IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 37, Pages: 2899-2908, ISSN: 0885-8993
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: 4
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.
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: 7
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: 2
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: 2
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.
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: 1
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: 1
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: 3
Wu J, Li S, Tan S-C, et 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
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- Citations: 4
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: 8
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: 6
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: 1
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: 1
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