Phase-detection-based feedback control for the power supply in tearing mode control system on J-TEXT

Mao, Li; Ren, Bo; Ding, Yong Hua; Li, Da; Jia, Ruo; Zhang, Wei

doi:10.1016/j.fusengdes.2019.03.122

Cited by 4 publications

(4 citation statements)

References 8 publications

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“…A Power Phase Detection System is an electrical engineering system designed to identify and monitor the phases of electrical power in a three-phase power distribution system [39]. The primary purpose of this system is to determine the correct phase sequence (usually labelled as Phase R, Phase S, and Phase T) in a three-phase power system.…”

Section: Power Phase Detection Systemmentioning

confidence: 99%

IoT APIs: Time Response Optimization in Edge Computing Data Communication for Power Phase Detection System

Nursuwars,

Shofa,

Andang

et al. 2024

E3S Web Conf.

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The IoT-based phase detection system is one of the important innovations in monitoring and managing modern electrical systems. However, challenges arise in presenting real-time data communication in the context of edge computing through the use of APIs. The problem that arises is the length of response time required in the data communication process, which can hamper the efficiency and accuracy of the system. The main objective of this research is to design and implement an effective strategy to reduce response time in API-based IoT data communication in phase detection systems. The method adopted includes a thorough analysis of existing communication processes and the development of optimized algorithms to speed up response times. This research approach involves measuring the response time before and after implementing an optimized algorithm on the client side, which in this case is represented by an Arduino device. Experiments were conducted using realistic data communication scenarios to validate the effectiveness of the proposed approach. The experimental results show that by optimizing the communication algorithm on the client side, the response time in IoT data communications can be significantly reduced. The response time which originally reached 4 seconds, was successfully reduced to only 0.8 seconds after the implementation of an optimized algorithm. This result has the potential to increase the operational efficiency of the system and expand the application of this technology in a variety of applications that require a fast response time.

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Section: Power Phase Detection Systemmentioning

confidence: 99%

IoT APIs: Time Response Optimization in Edge Computing Data Communication for Power Phase Detection System

Nursuwars,

Shofa,

Andang

et al. 2024

E3S Web Conf.

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show abstract

“…Preliminary studies show that the frequency response of this hopping-frequency PS is not fast enough to avoid mode locking and to keep a small f s . A new power supply (PS), which is capable of varying frequency continuously, has been built [27] and will be applied for this control strategy in the following campaign.…”

Section: Control Of the Tm Rotation By Applying A Rotating Rmp Fieldmentioning

confidence: 99%

“…The TM frequency could be increased by ~0.3 kHz with 1 kA of RMP coil current. A new pulsed PS [27], with a maximum current of 3 kA, has been built to further testify the impact of pulsed RMP on the frequency and width of the TMs. The preliminary experiment shows that the TM could be accelerated from 4.5 kHz to 7 kHz [17].…”

Section: Suppressing Magnetic Island and Accelerating Its Rotation By...mentioning

confidence: 99%

Overview of the recent experimental research on the J-TEXT tokamak

et al. 2019

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Recent J-TEXT research has highlighted the significance of the role that non-axisymmetric magnetic perturbations, so called three-dimensional (3D) magnetic perturbation (MP) fields, play in a fundamentally 2D concept, i.e. tokamaks. This paper presents the J-TEXT results achieved over the last two years, especially on the impacts of 3D MP fields on magnetohydrodynamic instabilities, plasma disruptions and plasma turbulence transport. On J-TEXT, the resonant MP (RMP) system, capable of providing either a static or a high frequency (up to 8 kHz) rotating RMP field, has been upgraded by adding a new set of 12 in-vessel saddle coils. The shattered pellet injection system was built in J-TEXT in the spring of 2018. The new capabilities advance J-TEXT to be at the forefront of international magnetic fusion facilities, allowing flexible study of 3D effects and disruption mitigation in a tokamak. The fast rotating RMP field has been successfully applied for avoidance of mode locking and the prevention of plasma disruption. A new control strategy, which applies pulsed RMP to the tearing mode only during the accelerating phase region, was proved by nonlinear numerical modelling to be efficient in accelerating mode rotation and even completely suppresses the mode. Remarkably, the rotating tearing mode was completely suppressed by the electrode biasing. The impacts of 3D magnetic topology on the turbulence has been investigated on J-TEXT. It is found that the fluctuations of electron density, electron temperature and plasma potential can be significantly modulated by the island structure, and a larger fluctuation level appears at the X-point of islands. The suppression of runaway electrons during disruptions is essential to the operation of ITER, and it has been reached by utilizing the 3D magnetic perturbations on J-TEXT. This may provide an alternative mechanism of runaway suppression for large-scale tokamaks and ITER.

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“…In J-TEXT, the two groups RMP coils [21], with a toroidal spatial phase difference of 90 • , are feedback controlled independently [22]. In order to improve the utilization of RMP and eliminate the static component, the RMP coils are fed by bi-polar pulsed currents, which is positive for certain region and negative for the else region in experiments [23]. The MRMP refers to applying the RMP only for a certain range of phase difference between the RMP and the island via feedback control.…”

Section: Introductionmentioning

confidence: 99%

Accelerating the magnetic island by the modulated resonant magnetic perturbation for the disruption avoidance on J-TEXT

Li¹,

Wang²,

Ding³

et al. 2022

Plasma Phys. Control. Fusion

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The acceleration of the magnetic island rotation by the modulated resonant magnetic perturbation (RMP) has been studied in J-TEXT tokamak experiments. The island rotation frequency is increased by a few kilohertz for the optimized relative phase by small RMPs of the order of 10-5 of the toroidal field. The disruption is avoided via accelerating the TM by the MRMP, which indicates a possible method for avoiding mode locking in a fusion reactor. The relative phase between the magnetic island and the RMP was found to be important for changing the island rotation.

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Phase-detection-based feedback control for the power supply in tearing mode control system on J-TEXT

Cited by 4 publications

References 8 publications

IoT APIs: Time Response Optimization in Edge Computing Data Communication for Power Phase Detection System

IoT APIs: Time Response Optimization in Edge Computing Data Communication for Power Phase Detection System

Overview of the recent experimental research on the J-TEXT tokamak

Accelerating the magnetic island by the modulated resonant magnetic perturbation for the disruption avoidance on J-TEXT

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