Design and Analysis of the Main AC/DC Converter System for ITER

(盛志才), Sheng Zhicai; Xu, Liuwei; Fu, Peng

doi:10.1088/1009-0630/14/4/13

Cited by 8 publications

(3 citation statements)

References 6 publications

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“…When one converter's firing angle is fixed at 180°, the power factor (PF 2 ) of the 12-pulse converter can be calculated by formula (12), and the per unit value (u d *) of the converter output voltage can also be calculated by formula (13).…”

Section: Analysis Of the Power Factor Of A 12-pulse Convertermentioning

confidence: 99%

“…However, as the fundamental disadvantages of phasecontrolled converters, a tremendous amount of reactive power is consumed by the superconducting coil converters during normal operation, which reduces the power stability margin and results in voltage instability [11][12][13]. So it is necessary to minimize the electrical energy loss during AC/DC conversion.…”

Section: Introductionmentioning

confidence: 99%

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Control strategy optimization for energy efficiency and harmonic mitigation in multi-series converters

Ronglin¹,

Fu²,

Zhu³

et al. 2019

Plasma Sci. Technol.

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To provide electrical power for the Research System of Superconducting Magnets (RSSMs) including the background field superconducting magnet and the tested superconducting objects, the high power phase-controlled converter will be used to develop the power supply system. However, because of its inner nonlinear feature, the current harmonics and the reactive power are injected into the AC power supply system. To improve the quality of the power supply system for RSSMs, an improved synchronous control strategy is suggested for the superconducting magnet power supply system, which comprises four series-connected six-pulse converters fed by a phase-shifting transformer, respectively. According to the proposed control strategy, the basic unit is two 12-pulse converters and the control method will be changed in terms of load fluctuations which are represented by the per unit value of converter output voltage. As a result, harmonic is greatly reduced but the power factor is also high.

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Section: Analysis Of the Power Factor Of A 12-pulse Convertermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Control strategy optimization for energy efficiency and harmonic mitigation in multi-series converters

Ronglin¹,

Fu²,

Zhu³

et al. 2019

Plasma Sci. Technol.

Self Cite

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“…Thyristor phase-control technology results in a large number of harmonics. Harmonics is related to filter design, grid security and electrical equipment safety [4][5][6][7][8]. It is one of the most important and difficult research areas in a converter system.…”

Section: Introductionmentioning

confidence: 99%

Harmonics analysis of the ITER poloidal field converter based on a piecewise method

Wang¹,

Xu²,

Fu³

et al. 2017

Plasma Sci. Technol.

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Poloidal field (PF) converters provide controlled DC voltage and current to PF coils. The many harmonics generated by the PF converter flow into the power grid and seriously affect power systems and electric equipment. Due to the complexity of the system, the traditional integral operation in Fourier analysis is complicated and inaccurate. This paper presents a piecewise method to calculate the harmonics of the ITER PF converter. The relationship between the grid input current and the DC output current of the ITER PF converter is deduced. The grid current is decomposed into the sum of some simple functions. By calculating simple function harmonics based on the piecewise method, the harmonics of the PF converter under different operation modes are obtained. In order to examine the validity of the method, a simulation model is established based on Matlab/ Simulink and a relevant experiment is implemented in the ITER PF integration test platform. Comparative results are given. The calculated results are found to be consistent with simulation and experiment. The piecewise method is proved correct and valid for calculating the system harmonics.

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