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The field winding based flux adjustable permanent magnet (FWFAPM) machines, including the hybrid excitation topology and the memory topology, can offer excellent capabilities in terms of flux regulation, wide constant power operation as well as de-excitation (flux-weakening) under fault, thus, they are capable for using in More Electric Aircraft (MEA) generator systems. First, this paper probes four basic hybrid excitation modes, and based on that, a general method deriving PM machines to hybrid excitation machines is established. The basic characteristics of each hybrid excitation mode considering the relationship between S-pole and N-pole are obtained for the first time. The performance differences of each hybrid excitation mode combined with different PM machines are summarized. Then, this general topology derivation method are extended for the memory topology, The unified derivation method of the single-PM topologies, the double-PM topologies and the triple-PM topologies for memory machines is systematically established.The general laws of the electromagnetic performance of each double-PM mode and triple-PM mode considering different relationships between NdFeB and AlNiCo are summarized for the first time. Finally, the control strategies for voltage regulation of aircraft generator systems are discussed based on the different critical control variables and controller types, a torque impulse balance control method which shows excellent dynamic performance for both target control variable and critical control variable has been achieved experimentally.
Yu Wang; Wenjuan Hao. General Topology Derivation Methods and Control Strategies of Field Winding-Based Flux Adjustable PM Machines for Generator System in More Electric Aircraft. IEEE Transactions on Transportation Electrification 2020, 6, 1478 -1496.
AMA StyleYu Wang, Wenjuan Hao. General Topology Derivation Methods and Control Strategies of Field Winding-Based Flux Adjustable PM Machines for Generator System in More Electric Aircraft. IEEE Transactions on Transportation Electrification. 2020; 6 (4):1478-1496.
Chicago/Turabian StyleYu Wang; Wenjuan Hao. 2020. "General Topology Derivation Methods and Control Strategies of Field Winding-Based Flux Adjustable PM Machines for Generator System in More Electric Aircraft." IEEE Transactions on Transportation Electrification 6, no. 4: 1478-1496.
DC-DC converters with high dynamic performance are attracting more and more attentions in industry and academia. The charge balance control (CBC) method enables the single-input DC-DC (SIDD) converter system to achieve optimal dynamic performance. In this paper, the CBC method for the multi-port converter is proposed, and the analogy as well as the innovative transplantation approach of the CBC from single-input systems to multi-input systems are developed. First, general steps and unified equations of the CBC for SIDD converter are summarized. Second, through analogy analysis, the CBC method is transplanted to a full-bridge three-port converter(FB-TPC) system to improve the dynamic performance under load step change. Third, through innovative transplantation, a CBC strategy based on magnetizing current three-stage regulation is proposed, achieving optimal dynamic performance for the FB-TPC system under power distribution step change. Experimental results on a FB-TPC verify the feasibility and effectiveness of the CBC methods for multi-port converter and the transplantation method.
Yu Wang; Xin Xu; Hongwei Fu; Wenjuan Hao. Charge Balance Control for DC/DC Converter Systems: From Single-Input Systems to Multiple-Input Systems. IEEE Journal of Emerging and Selected Topics in Power Electronics 2019, 9, 206 -222.
AMA StyleYu Wang, Xin Xu, Hongwei Fu, Wenjuan Hao. Charge Balance Control for DC/DC Converter Systems: From Single-Input Systems to Multiple-Input Systems. IEEE Journal of Emerging and Selected Topics in Power Electronics. 2019; 9 (1):206-222.
Chicago/Turabian StyleYu Wang; Xin Xu; Hongwei Fu; Wenjuan Hao. 2019. "Charge Balance Control for DC/DC Converter Systems: From Single-Input Systems to Multiple-Input Systems." IEEE Journal of Emerging and Selected Topics in Power Electronics 9, no. 1: 206-222.
Yu Wang; Hui Gu; Wenjuan Hao. An Induction Generator System Based on Instantaneous Torque Impulse Balance Control (ITIBC). IEEE Transactions on Power Electronics 2019, 34, 12296 -12309.
AMA StyleYu Wang, Hui Gu, Wenjuan Hao. An Induction Generator System Based on Instantaneous Torque Impulse Balance Control (ITIBC). IEEE Transactions on Power Electronics. 2019; 34 (12):12296-12309.
Chicago/Turabian StyleYu Wang; Hui Gu; Wenjuan Hao. 2019. "An Induction Generator System Based on Instantaneous Torque Impulse Balance Control (ITIBC)." IEEE Transactions on Power Electronics 34, no. 12: 12296-12309.
In view of the relatively low estimation accuracy in the low‐pass filter (LPF)‐based sliding mode observer (SMO) method, synchronous reference frame filter (SRFF)‐based SMO (without input LPF) method, and SRFF‐based SMO (with input LPF) method, an improved SRFF‐based SMO position sensorless method of the open‐winding permanent magnet generator (OWPMG) system is presented. This improved SRFF consists of a programmable eighth‐order low‐pass filter (8th‐PLPF), a traditional SRFF, and two phase‐locked loops (PLL1 and PLL2). Based on the synchronous angular frequency obtained by PLL2, the 8th‐PLPF together with the traditional SRFF can not only effectively filter out the harmonics in the output of the SMO but also achieve the fundamental back‐EMF without magnitude and phase angle errors. Then, based on the obtained accurate back‐EMF, the estimated rotor position angle can be obtained without phase shift. The OWPMG system using the improved method can work well in both steady‐state and dynamic conditions, which is verified by experimental results. © 2019 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.
Yu Wang; Wenjuan Hao. An improved synchronous reference frame filter for sliding mode observer position sensorless method of open‐winding pm generator system. IEEJ Transactions on Electrical and Electronic Engineering 2019, 14, 943 -947.
AMA StyleYu Wang, Wenjuan Hao. An improved synchronous reference frame filter for sliding mode observer position sensorless method of open‐winding pm generator system. IEEJ Transactions on Electrical and Electronic Engineering. 2019; 14 (6):943-947.
Chicago/Turabian StyleYu Wang; Wenjuan Hao. 2019. "An improved synchronous reference frame filter for sliding mode observer position sensorless method of open‐winding pm generator system." IEEJ Transactions on Electrical and Electronic Engineering 14, no. 6: 943-947.
Linear flux switching permanent magnetic (LFSPM) machines, with the armature windings and magnets both on the mover in addition to a robust stator, are a good choice for long stoke applications, however, a large cogging force is also inevitable due to the double salient structure, and will worsen the system performance. Skewing methods are always employed for the rotary machines to reduce the cogging torque, and the rotor step-skewed method is a low-cost approximation of regular skewing. The step skewed method can also be applied to the linear machines, namely, the stator step skewed. In this paper, three stator step skewed structures, which are a three-step skewed stator, a two-step skewed stator and an improved two-step skewed stator, are employed for the cogging force reduction of two types of LFSPM machines. The three structures are analyzed and compared with emphasize on the influence of the skewed displacement on the cogging force and the average thrust force. Based on finite element analysis (FEA), proper skewed displacements are selected according to maximum difference between the reduction ratio of the cogging force and the decrease ratio of the average thrust force, then, the corresponding results are compared, and finally, valuable conclusions are drawn according to the comparison. The comparison presented in this paper will be useful to the cogging force reduction of LFSPM machines in general.
Wenjuan Hao; Yu Wang. Comparison of the Stator Step Skewed Structures for Cogging Force Reduction of Linear Flux Switching Permanent Magnet Machines. Energies 2018, 11, 2172 .
AMA StyleWenjuan Hao, Yu Wang. Comparison of the Stator Step Skewed Structures for Cogging Force Reduction of Linear Flux Switching Permanent Magnet Machines. Energies. 2018; 11 (8):2172.
Chicago/Turabian StyleWenjuan Hao; Yu Wang. 2018. "Comparison of the Stator Step Skewed Structures for Cogging Force Reduction of Linear Flux Switching Permanent Magnet Machines." Energies 11, no. 8: 2172.
Fault-tolerant flux-switching permanent-magnet (FTFSPM) machines are suitable for high-reliability applications owing to their good fault-tolerant capability and relatively high torque density. Under a short-circuit fault, the torque ripple caused by the short-circuit current of the FTFSPM machine affects the steady-state performance of the system; in addition, the traditional proportional-integral (PI) controller of the speed loop can hardly guarantee the optimal dynamic performance of the speed. In this study, to solve these two problems, an improved control strategy that can offer two improvements for the FTFSPM machine under the short-circuit condition is investigated. As the first improvement, on the basis of analysis of the torque ripple caused by the short-circuit current, the feed-forward control is employed to reduce both the torque ripple. As the second improvement, on the basis of analysis of the influence of the speed loop PI parameters on the system dynamic performance, a torque integral balance-control method is proposed. This algorithm can make the speed and the electromagnetic torque converge simultaneously after only one adjustment of the speed. Thus, the best possible dynamic response for the speed can be achieved. Experimental results verify the correctness and effectiveness of the improved control strategy.
Yu Wang; Liang Geng; Wenjuan Hao; Wenyan Xiao. Improved Control Strategy for Fault-Tolerant Flux-Switching Permanent-Magnet Machine Under Short-Circuit Condition. IEEE Transactions on Power Electronics 2018, 34, 4536 -4557.
AMA StyleYu Wang, Liang Geng, Wenjuan Hao, Wenyan Xiao. Improved Control Strategy for Fault-Tolerant Flux-Switching Permanent-Magnet Machine Under Short-Circuit Condition. IEEE Transactions on Power Electronics. 2018; 34 (5):4536-4557.
Chicago/Turabian StyleYu Wang; Liang Geng; Wenjuan Hao; Wenyan Xiao. 2018. "Improved Control Strategy for Fault-Tolerant Flux-Switching Permanent-Magnet Machine Under Short-Circuit Condition." IEEE Transactions on Power Electronics 34, no. 5: 4536-4557.
The multi-tooth fault tolerant switched-flux machines (MTFTSFM) providing both excellent fault tolerant capability and relatively high torque density are good choices for high reliability applications. A rapid control of the electromagnetic torque under open-circuit fault can always be achieved by the direct torque control with voltage vector reconstruction (RDTC); however, with respect to the rotor speed, its dynamic performance is still impacted by the proportion-integration (PI) parameters. Therefore, a torque impulse balance control (TIBC) is investigated in this paper for the MTFTSFM under open-circuit fault to obtain excellent dynamic performance of the rotor speed. During the dynamic state, the electromagnetic torque and the speed can converge at the same time after only one adjustment of the speed by using the optimized voltage vector sequence based on torque impulse balance, thus, achieving the best possible dynamic process for the speed. The TIBC method is carried out on an MTFTSPM machine system, and the correctness and effectiveness are verified.
Yu Wang; Wenjuan Hao. A Torque Impulse Balance Control for Multi-Tooth Fault Tolerant Switched-Flux Machines under Open-Circuit Fault. Energies 2018, 11, 1919 .
AMA StyleYu Wang, Wenjuan Hao. A Torque Impulse Balance Control for Multi-Tooth Fault Tolerant Switched-Flux Machines under Open-Circuit Fault. Energies. 2018; 11 (7):1919.
Chicago/Turabian StyleYu Wang; Wenjuan Hao. 2018. "A Torque Impulse Balance Control for Multi-Tooth Fault Tolerant Switched-Flux Machines under Open-Circuit Fault." Energies 11, no. 7: 1919.
The direct torque control system has excellent dynamic performance of electromagnetic torque, however, the dynamic performance of the speed is affected by the PI parameters of the speed closed loop. Hence, a control method which can realize the optimal dynamic performance of the speed is investigated in this paper. In this method, the integration balance of sine value for the torque angle is introduced, based on this, the speed and the electromagnetic torque can be controlled to converge simultaneously after the speed adjusting only once. Thus, the best possible dynamic response for the speed can be achieved. The proposed method is verified by both simulation and experimental results.
Yu Wang; Liang Geng; Wen Juan Hao; Wenyan Xiao. Control Method for Optimal Dynamic Performance of DTC-Based PMSM Drives. IEEE Transactions on Energy Conversion 2018, 33, 1285 -1296.
AMA StyleYu Wang, Liang Geng, Wen Juan Hao, Wenyan Xiao. Control Method for Optimal Dynamic Performance of DTC-Based PMSM Drives. IEEE Transactions on Energy Conversion. 2018; 33 (3):1285-1296.
Chicago/Turabian StyleYu Wang; Liang Geng; Wen Juan Hao; Wenyan Xiao. 2018. "Control Method for Optimal Dynamic Performance of DTC-Based PMSM Drives." IEEE Transactions on Energy Conversion 33, no. 3: 1285-1296.
Linear flux-switching permanent magnetic (LFSPM) machines are good choices for long stroke applications. These machines deliver high thrust force density in addition to the machine structure where permanent magnetics (PMs) and windings are all on the short mover. For LFSPM machines, their performance is always affected by big thrust force ripple. In this paper, for two C-core LFSPM machines of high thrust force capability, including a 6/13 C-core LFSPM (6/13LFSPM-C) machine and a sandwiched C-core LFSPM (SLFSPM-C) machine, and a thrust force ripple reduction method is proposed. The proposed method is developed by reducing the slot effect component of the cogging force based on staggered stator tooth, and suppressing the thrust force ripple caused by unbalanced three phase back-electromagnetic forces (EMFs) based on two end PMs. Based on finite element analysis (FEA) results, both C-core LFSPM machines can achieve small thrust force ripples as well as high sinusoidal back-EMFs, and at the same time, maintain high thrust force capability with the proposed method. It was also found that, the improved SLFSPM-C machine exhibited the same thrust force capability as the improved 6/13LFSPM-C machine, but with a much smaller thrust force ripple.
Wenjuan Hao; Yu Wang. Thrust Force Ripple Reduction of Two C-Core Linear Flux-Switching Permanent Magnet Machines of High Thrust Force Capability. Energies 2017, 10, 1608 .
AMA StyleWenjuan Hao, Yu Wang. Thrust Force Ripple Reduction of Two C-Core Linear Flux-Switching Permanent Magnet Machines of High Thrust Force Capability. Energies. 2017; 10 (10):1608.
Chicago/Turabian StyleWenjuan Hao; Yu Wang. 2017. "Thrust Force Ripple Reduction of Two C-Core Linear Flux-Switching Permanent Magnet Machines of High Thrust Force Capability." Energies 10, no. 10: 1608.