List of Titles

High-efficiency WPT system for CC/CV charging based on double-half-bridge inverter topology with variable inductors

- Zhu, Xiao, Zhao, Xing, Li, Yong, Liu, Shunpan, Yang, Huanyu, Tian, Jihao, Hu, Jiefeng, Mai, Ruikun, He, Zhengyou

Authors: Zhu, Xiao , Zhao, Xing , Li, Yong , Liu, Shunpan , Yang, Huanyu , Tian, Jihao , Hu, Jiefeng , Mai, Ruikun , He, Zhengyou
Date: 2022
Type: Text , Journal article
Relation: IEEE Transactions on Power Electronics Vol. 37, no. 2 (2022), p. 2437-2448
Full Text: false
Reviewed:
Description: Efficiency remains a key challenge in wireless charging in academia and industry. In this article, a new wireless power transfer (WPT) system based on a double-half-bridge (DHB) inverter with two variable inductors (VIs) is proposed. Compared with conventional full-bridge (FB) inverters, the DHB inverter can reduce the current through the mosfets under the same output power and thus, reduce the conduction loss. Next, by adjusting the inductances of the VIs instead of using phase shift (PS) method, the output voltage or current can be controlled, while the circulating current can be eliminated and wide-range zero voltage switching operation can be achieved. Consequently, the power loss can be further reduced. Circuit analysis, VI design, as well as hardware implementation, are provided in detail. A laboratory prototype is built to verify the feasibility of the proposed method. Close agreement is obtained between simulation and experimental results. The maximum efficiency can reach 92.4%, which is 3.65% higher than traditional PS control. © 1986-2012 IEEE.

Enhancement of voltage regulation capability for DC-microgrid composed by battery test system : a fractional-order virtual inertia method

- Long, Bo, Zeng, Wei, Rodriguez, Jose, Guerrero, Joseph, Hu, Jiefeng, Chong, Kil To

Authors: Long, Bo , Zeng, Wei , Rodriguez, Jose , Guerrero, Joseph , Hu, Jiefeng , Chong, Kil To
Date: 2022
Type: Text , Journal article
Relation: IEEE Transactions on Power Electronics Vol. 37, no. 10 (2022), p. 12538-12551
Full Text: false
Reviewed:
Description: Electric vehicle (EV) has been widely used in our life, one of the key technologies is the batteries, power accumulator battery test system (PABTS), which is initiated for evaluating the performance of the EV batteries, has been used in many battery-manufacture companies. The parallel operation of the PABTS forms a dc-microgrid, owing to the low inertia of the dc-link capacitance, the charging and discharging tests of the batteries can easily cause dc-bus voltage fluctuations, which may jeopardize the system stability. To increase the system inertia and achieve good system stability, a fractional-order model-predictive-control (FOMPC) and fractional-order virtual-inertia-control (FOVIC) strategy (namely, FOMPC-FOVIC method) is proposed for the bidirectional grid-connected converter. First, the fractional-order virtual inertial link is used to replace the integral-order virtual inertial link, which significantly improves the system stability. Second, combined with fractional-order model-predictive-control, virtual dc current compensation is proposed to further suppress the dc-bus voltage fluctuations. Finally, the fractional-order discrete state-space equation of the virtual inertial link is derived, and the cost function design and its optimal solution are elaborated. To demonstrate the effectiveness of the proposed FOMPC-FOVIC scheme, experimental results indicate that the proposed method is superior to the existing methods in terms of inertial support and dc-bus voltage regulation. © 1986-2012 IEEE.

A new magnetic coupler with high rotational misalignment tolerance for unmanned aerial vehicles wireless charging

- Li, Yong, Sun, Wenjun, Liu, Junjiang, Liu, Yuhang, Yang, Xiao, Li, Yanling, Hu, Jiefeng, He, Zhengyou

Authors: Li, Yong , Sun, Wenjun , Liu, Junjiang , Liu, Yuhang , Yang, Xiao , Li, Yanling , Hu, Jiefeng , He, Zhengyou
Date: 2022
Type: Text , Journal article
Relation: IEEE Transactions on Power Electronics Vol. 37, no. 11 (2022), p. 12986-12991
Full Text: false
Reviewed:
Description: In this letter, a novel magnetic coupler with high rotational misalignment tolerance is proposed for unmanned aerial vehicles (UAVs) wireless charging. The transmitting coil consists of an inner coil and an outer circular coil connected in series, which generates a horizontal magnetic field from the center to all periphery directions within the charging range. Then, to receive the flux effectively and to adapt to UAV's structure, a vertical square air-core coil is designed and attached to the landing gear. The proposed magnetic coupler can reduce significantly the magnetic fluxes penetrating through the body of the UAV, therefore mitigating electromagnetic interference with onboard devices. Simulation based on ANSYS Maxwell and experiments based on a laboratory prototype are carried out to validate the proposal. The results show that, the proposed magnetic coupler can transmit power in all 360° of rotational misalignments, and the output voltage of the wireless charging system fluctuates only 2% around the 48 V reference. © 1986-2012 IEEE.

Smart grid evolution : predictive control of distributed energy resources—A review

- Babayomi, Oluleke, Zhang, Zhenbin, Dragicevic, Tomislav, Hu, Jiefeng, Rodriguez, Jose

Authors: Babayomi, Oluleke , Zhang, Zhenbin , Dragicevic, Tomislav , Hu, Jiefeng , Rodriguez, Jose
Date: 2023
Type: Text , Journal article , Review
Relation: International Journal of Electrical Power and Energy Systems Vol. 147, no. (2023), p.
Full Text: false
Reviewed:
Description: As the smart grid evolves, it requires increasing distributed intelligence, optimization and control. Model predictive control (MPC) facilitates these functionalities for smart grid applications, namely: microgrids, smart buildings, ancillary services, industrial drives, electric vehicle charging, and distributed generation. Among these, this article focuses on providing a comprehensive review of the applications of MPC to the power electronic interfaces of distributed energy resources (DERs) for grid integration. In particular, the predictive control of power converters for wind energy conversion systems, solar photovoltaics, fuel cells and energy storage systems are covered in detail. The predictive control methods for grid-connected converters, artificial intelligence-based predictive control, open issues and future trends are also reviewed. The study highlights the potential of MPC to facilitate the high-performance, optimal power extraction and control of diverse sustainable grid-connected DERs. Furthermore, the study brings detailed structure to the artificial intelligence techniques that are beneficial to enhance performance, ease deployment and reduce computational burden of predictive control for power converters. © 2022 Elsevier Ltd

A novel continuous control set model predictive control for lc-filtered three-phase four-wire three-level voltage-source inverter

- Yang, Yong, Xiao, Yang, Fan, Mingdi, Wang, Kaixin, Zhang, Xinan, Hu, Jiefeng, Fang, Gang, Zeng, Weibo, Vazquez, Sergio, Rodriguez, Jose

Authors: Yang, Yong , Xiao, Yang , Fan, Mingdi , Wang, Kaixin , Zhang, Xinan , Hu, Jiefeng , Fang, Gang , Zeng, Weibo , Vazquez, Sergio , Rodriguez, Jose
Date: 2023
Type: Text , Journal article
Relation: IEEE Transactions on Power Electronics Vol. 38, no. 4 (2023), p. 4572-4584
Full Text: false
Reviewed:
Description: In this article, a novel continuous control set model predictive control (CCS-MPC) is proposed for an LC-filtered three-phase three-level four-wire voltage-source inverter (3P-4W-3L-VSI). The proposed MPC algorithm provides independent control of each phase of the 3P-4W-3L-VSI under various unbalanced load conditions, which shows superior performance under unbalanced loads. Furthermore, different from conventional MPC methods, the CCS-MPC achieves fixed switching frequency, hence simplifying the design of LC filters. In addition, dc offsets are introduced to the proposed modulation to effectively balance the neutral-point voltage of the 3P-4W-3L-VSI. Experimental results are presented to verify the effectiveness of the proposed MPC algorithm. © 1986-2012 IEEE.

Grid impedance detection based on complex coefficient filter and full-order capacitor current observer for three-phase grid-connected inverters

- Wang, Kaixin, Yang, Yong, Fan, Mingdi, Tang, Yuhang, Li, Haoyang, Chen, Rong, Hu, Jiefeng, Zeng, Weibo, Rodriguez, Jose

Authors: Wang, Kaixin , Yang, Yong , Fan, Mingdi , Tang, Yuhang , Li, Haoyang , Chen, Rong , Hu, Jiefeng , Zeng, Weibo , Rodriguez, Jose
Date: 2023
Type: Text , Journal article
Relation: IEEE Transactions on Power Electronics Vol. 38, no. 2 (2023), p. 2408-2420
Full Text: false
Reviewed:
Description: This article proposes a new grid impedance detection method incorporating the complex coefficient filter (CCF) with full-order capacitor current observer for a T-type three-level grid-connected inverter controlled by the inverter output current feedback. Compared with conventional CCF impedance detection algorithms, the proposed method reduces the number of current sensors and detects the grid impedance accurately. First, based on the sampled inverter output current and grid-connected voltage signals, the grid-connected current is estimated. Then, the CCF method is used to extract harmonics from the grid-connected current and voltage signals to calculate the grid impedance. Finally, the correctness of the full-order capacitor current observer is verified by simulation and the feasibility and effectiveness of the proposed algorithm are verified experimentally based on a laboratory prototype. © 1986-2012 IEEE.

A simultaneous power and data transmission technology based on coil multiplexing in domino-resonator WPT systems

- Li, Yong, Yang, Xiao, Sun, Wenjun, Hu, Jiefeng, He, Zhengyou

Authors: Li, Yong , Yang, Xiao , Sun, Wenjun , Hu, Jiefeng , He, Zhengyou
Date: 2023
Type: Text , Journal article
Relation: IEEE Transactions on Power Electronics Vol. 38, no. 3 (2023), p. 2878-2883
Full Text: false
Reviewed:
Description: To achieve parallel power and data transmission in domino-resonator wireless power transfer (WPT) systems, a novel simultaneous power, and data transfer (SPDT) technology based on coil multiplexing is proposed in this letter. Benefiting from the magnetic field characteristics of the bipolar coil structure, the power and data can be injected into multiplexed coils with different flow directions, leading to opposite induced voltage polarities in each coupling coil. Subsequently, a corresponding resonator circuit is developed to form independent power and data resonance loops. In addition, an injected data transmission scheme is developed for domino-resonator WPT systems. Compared with traditional SPDT methods, additional wave trappers and coupling structures are avoided by this proposed technology, and the interference between power and data transfer is significantly eliminated. A 23.6 W laboratory prototype with five domino resonators is built to validate the feasibility of this proposed technology. The experimental results show that the power transfer efficiency reaches 70% at 50 kb/s data transfer rate. © 1986-2012 IEEE.

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