Robust Zero Power Levitation Control of Quadruple Hybrid EMS System

Cho, Su-Yeon; Kim, Won-Ho; Jang, Ik-Sang; Kang, Dong-Woo; Lee, Ju

doi:10.5370/jeet.2013.8.6.1451

Cited by 10 publications

(6 citation statements)

References 6 publications

(6 reference statements)

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“…where k c1 and k c2 are the coefficient of the current loop. The time constant is then changed to be T ′ = L 0 ∕(R + k c1 k c2 ), the time delay of the electromagnet windings is thus reduced dramatically if k c1 k c2 >> R. By combining (5) and (6), the proportional value between the winding current value i and controller output value u in steady state can be obtained as:…”

Section: Controller Design 221 Current Loop Designmentioning

confidence: 99%

“…To further optimize the energy consumption of the maglev train, a new kind of permanent magnet electro-magnetic suspension (PEMS) type maglev is proposed. In the PEMS maglev, a permanent magnet is added inside the core of the electromagnet to share part of the load [5]. The energy consumed is reduced and the overheating problem is solved [6].…”

Section: Introductionmentioning

confidence: 99%

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Fault tolerant control for joint structure in PEMS high speed maglev train

Wang

2020

Asian Journal of Control

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The PEMS high speed maglev train, which features a permanent magnet inside an electromagnet, is a new kind of maglev train for long distance intercity transportation. The joint structure, which consists of two single levitation sub‐systems, is the fundamental levitation unit. Two kinds of faults are considered and corresponding fault tolerant control strategies are proposed. The first fault condition is when a gap sensor that is part of a single levitation system is faulty. For this kind of fault, a fault tolerant control strategy based on signal reconfiguration is proposed. The second fault condition is when the whole of a single levitation sub‐system is faulty. Under this condition, a faulty model is firstly established, then a fault tolerant control strategy is designed. When this kind of fault is detected, a switch from the normal controller to the fault tolerant controller can make the faulty system stable.

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Section: Controller Design 221 Current Loop Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fault tolerant control for joint structure in PEMS high speed maglev train

Wang

2020

Asian Journal of Control

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“…Zhang and et al [6] focused on the optimal structural design of the PEMS magnet and proposed optimized parameters with better carrying capability and lower suspension power loss. Cho and et al [16] reported a successful quadruple PEMS system with the improved zero-power control algorithm.…”

Section: Introductionmentioning

confidence: 99%

Electronic Nonlinearity of Full-Bridge PWM Inverter for Zero-Power PEMS System

et al. 2022

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The permanent-electro magnetic suspension (PEMS) technology takes advantage of the attractive magnetic force between the magnet and the iron core and reduces the power consumption eventually to zero. However, the active current in the electromagnet of the zero-power PEMS system fluctuates around zero due to external disturbances and suffers from the electronic nonlinearity of the driving circuit, such as the full-bridge pulse-width-modulation (PWM) inverter. This work presents that the 2 μs turn-off delay (one electronic defect) of the integrated circuit L298N (one commercial full-bridge PWM inverter produced by STMicroelectronics) leads to the nonlinear current-duty cycle characteristic, which undermines the control stability and limits the PWM frequency of the zero-power PEMS system. Moreover, the nonlinear mechanism is experimentally and theoretically analyzed for the critical PWM frequency and the sensitivity transition with respect to the 2 μs turn-off delay. Besides, the critical PWM frequency is of great significance for the energy efficiency and the dynamic performance of the high-speed PEMS transportation system.

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“…There have been some researches about PEMS maglev these years. Su-Yeon Cho et al utilized zero-power control for a quadruple PEMS system [9], in this experiment setup, four PEMS systems are bounded on each corner of a square metal plate, the structural coupling influences the whole system's performance. In [10], an optimizing method was adopted on permanent magnet parameters to minimize the power loss while maximize the carrying capacity at the same time under system constrains.…”

Section: Introductionmentioning

confidence: 99%

Fault Analysis and Tolerant Control for High Speed PEMS Maglev Train End Joint Structure with Disturbance Rejection

Wang

2019

J. Electr. Eng. Technol.

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It is observed in test operation that for permanent magnet electro-magnetic suspension (PEMS) type high speed maglev train, when a single levitation unit in an end joint structure fails to work, the performance of the entire joint structure deteriorates rapidly, whereas in electro-magnetic suspension (EMS) type maglev system, there is no such phenomenon under the same failure. To solve this problem and to enhance system performance under faulty condition, firstly a comparative modeling of EMS and PEMS maglev end joint structure system was made to analyze the underlying reasons. Then a dynamic compensation method and a disturbance rejection method based on disturbance estimation and feedback linearization were proposed respectively. The performances of the proposed measures are verified and compared in simulations.

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Robust Zero Power Levitation Control of Quadruple Hybrid EMS System

Cited by 10 publications

References 6 publications

Fault tolerant control for joint structure in PEMS high speed maglev train

Fault tolerant control for joint structure in PEMS high speed maglev train

Electronic Nonlinearity of Full-Bridge PWM Inverter for Zero-Power PEMS System

Fault Analysis and Tolerant Control for High Speed PEMS Maglev Train End Joint Structure with Disturbance Rejection

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