Design and development of the power supply system for HL-2A tokamak

Yao, Lina; Weimin, Xuan; Li, Huajun; Chen, Yuhong; Mingnan, Bu; Kui, Shao; Hu, H.; Mao, Xiaohui; Wang, Shujin; Juqian, Ren

doi:10.1016/j.fusengdes.2005.06.081

Cited by 21 publications

(4 citation statements)

References 3 publications

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“…Inputting the desired coil current profile directly into the power supply yields discrepancies due to the slow response of the thyristorized supply and inductive load [6]. To attain a quicker control response [7], a simulation and experimental study assessed horizontal displacement control system performance against instability.…”

Section: Introductionmentioning

confidence: 99%

An approach for control of equilibrium field profile through the real-time plasma current in ADITYA-U and SST-1 tokamaks

Gupta,

Shah,

Makwana

et al. 2024

Preprint

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Pairs of external magnetic field coils placed outside the vessel maintain plasma equilibrium in tokamaks. The shape and position of the plasma column are determined and controlled by the temporal current profile in the external field coils. The temporal profile of the coil current mainly controls the horizontal movement of the plasma column, which keeps the plasma column at the vessel center. Hence, it is important to set and control the equilibrium profile according to the plasma current evolution and its profile. For this purpose, a controlled power supply is used to set the current in the coils as per the given reference profile. Currently, during plasma operation in the ADITYA-U and SST-1 tokamaks, a pre-programmed profile is used to generate the coil current profile, which is a passive form of control. For modern tokamak operations, however, real-time plasma control is essential. A novel technique has been devised for controlling the equilibrium field profile in ADITYA-U and SST-1 tokamaks using the real-time plasma current. To match the output current profile with the plasma current profile, a preconditioning system called Plasma Current Conditioning (PCC) is developed. To accomplish this, a MATLAB Simulink model of a 35-year-old power supply and a mathematical model of inverse control were developed, which generates the required reference profile in real time based on the current plasma profile. Using prior experimental data, the model has been exhaustively tested and validated.

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Section: Introductionmentioning

confidence: 99%

An approach for control of equilibrium field profile through the real-time plasma current in ADITYA-U and SST-1 tokamaks

Gupta,

Shah,

Makwana

et al. 2024

Preprint

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“…The main power supply of HL-2A is pulse generator system and a doublefed unit based on Thyristors has built to increase the rotation speed. But converters based on Thyristors have some defects such as low power factor and serious harmonics [6].…”

Section: Introductionmentioning

confidence: 99%

Design of the Double-Fed Unit for J-TEXT 100 MVA Pulse Generator System

et al. 2015

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J-TEXT, formerly known as TEXT-U, has been reconstructed since 2004. The 100 MVA pulse generator system is the main power supply of J-TEXT, including the toroidal coil, the ohmic heat coil and the divertor coil and high-voltage power supply for Electron Cyclotron Resonance Heating. The pulse generator system was designed in USA with a 60 Hz grid so that the maximum rotation speed of the flywheel was 713 rpm and the maximum stored energy was 185 MJ. Now in China the grid is 50 Hz, in asynchronous mode the maximum rotation speed of the flywheel is 598 rpm and maximum stored energy is 128 MJ. To reach the designed maximum rotation speed of the pulse generator system, a doubled-fed unit is designed to ensure the tokamak operates with high parameters. This paper presents the design procedure of the double-fed unit: including the stator field oriented control of the double-fed induction motor, voltage oriented control of the AC-DC rectifier and the structure of the control system. The experiment results show the feasibility of the unit.

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“…Among the PFPS, the parameters of Ohmic heating power supply (OHPS) are rather higher than those of the others. The OHPS consists of four 4quadrant thyristor converters [2,3] . Since the value of the subtransient reactance of the generator is crucial for the OHPS to work reliably when its positive convertors change suddenly and heavily from their operation status at full current from rectifier mode to inverter mode, it should be carefully studied and selected.…”

Section: Introductionmentioning

confidence: 99%

Study on Matching a 300 MVA Motor Generator with an Ohmic Heating Power Supply in HL-2M

Peng

Weimin²,

Wang³

et al. 2013

Plasma Sci. Technol.

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A new 300 MVA/1350 MJ motor generator (MG) will be built to feed all of the poloidal field power supplies (PFPS) and auxiliary heating power supplies of the HL-2M tokamak. The MG has a vertical-shaft salient pole 6-phase synchronous generator and a coaxial 8500 kW induction motor. The Ohmic heating power supply (OHPS) consisting of 4-quadrant DC pulsed convertor is the one with the highest parameters among the PFPS. Therefore, the match between the generator and the OHPS is very important. The matching study with Matlab/Simulink is described in this paper. The simulation results show that the subtransient reactance of the generator is closely related to the inversion operation of the OHPS. By setting various subtransient reactance in the simulation generator model and considering the cost reduction, the optimized parameters are obtained as x d = 0.405 p.u. at 100 Hz for the generator. The models built in the simulation can be used as an important tool for studying the dynamic characteristics and the control strategy of other HL-2M PFPSes.

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Design and development of the power supply system for HL-2A tokamak

Cited by 21 publications

References 3 publications

An approach for control of equilibrium field profile through the real-time plasma current in ADITYA-U and SST-1 tokamaks

An approach for control of equilibrium field profile through the real-time plasma current in ADITYA-U and SST-1 tokamaks

Design of the Double-Fed Unit for J-TEXT 100 MVA Pulse Generator System

Study on Matching a 300 MVA Motor Generator with an Ohmic Heating Power Supply in HL-2M

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