Optimization for Tokamak Reactive Power Compensation and Filtering System

Wu, Yanan; Ji, Yue; Xu, Leijun; Fu, Peng; Mao, Huafeng; Li, Jun; Guo, Qi

doi:10.1007/s10894-014-9756-8

Cited by 6 publications

(2 citation statements)

References 8 publications

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“…Through the capacitive impedance of the grid and SVC system, the second‐order harmonic current at test point T1 is amplified up to 722 A in 10 kV bus. However, there is no corresponding second‐order harmonic suppression device for the filtering platform in EAST at present …”

Section: Current Status Of Low‐order Harmonic Suppression In Tokamak mentioning

confidence: 99%

“…However, there is no corresponding second-order harmonic suppression device for the filtering platform in EAST at present. 12 From the experience gained above, Tokamak devices often construct passive filter branch or add damping resistances to avoid resonant excitation within a certain frequency spectrum. These passive methods can solve the resonance effectively to some extent.…”

Section: Current Status Of Low-order Harmonic Suppression In Tokamamentioning

confidence: 99%

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A new hybrid filter based on differential current control method for low-order harmonic suppression in Tokamak power system

Lü

et al. 2017

Int J Energy Res

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SummaryWith high-power, high-parameter operation of Tokamak device, not only characteristic harmonics but also much noncharacteristic harmonics, especially below the third-order harmonics, present in its power supply system. These low-order harmonics, which further amplified by the capacitive impedance in system, will endanger the reliable operation of Tokamak device and the power supply. Although Tokamak devices have taken some filtering measures, the resonance of low-order harmonics could not be completely prevented. In this paper, a hybrid filter based on differential current control method is proposed, which can effectively increase the filtering capability. The hybrid filter was mainly analyzed and validated in EAST power supply system. The results show that it can restrain the resonance and suppress low-order harmonics in the system and can be extended to large-capacity occasions.KEYWORDS differential current control, hybrid filter, low-order harmonic suppression, Tokamak power system 1 | INTRODUCTION Tokamak, which uses strong magnetic field to confine plasma in the shape of a torus achieving a stable plasma equilibrium, may be the ultimate solution on the energy crisis. The Tokamak devices such as EAST, KSTAR, ASDEX-U and others aim to reach higher plasma current and longer plasma sustaining time under high performance operation (H-mode) during experiments. To achieve such high performance of plasmas, extreme high demand of the power, usually at the order of hundreds of MVA, is required for the power supplies system, as well as the fast transients. 1 Thyristor-based converters are widely selected for the majority of the Tokamak power supplies due to the high current rating and the DC voltage/current characteristics. However, such complex operation mode will directly lead to the asymmetry of the converter firing angles, sharp fluctuations of current amplitude and phase in the AC system, direct current bias of transformer and dynamic harmonic coupling between AC and DC network. 2 These will usually stimulate low-order harmonic in the AC side, for instance, second, third, or even inter harmonics. 3 The power suppliers will draw large reactive power pulses from the grid, and reactive power control is necessary for voltage stabilization and compensation together with filters to eliminate harmonics generated by the power converters. The improper design of the filters will result in the harmonic application in the low frequency (75-135 Hz) domain. These low-order harmonics can jeopardize Tokamak system operation and the security of the grid.

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Section: Current Status Of Low‐order Harmonic Suppression In Tokamak mentioning

confidence: 99%

Section: Current Status Of Low-order Harmonic Suppression In Tokamamentioning

confidence: 99%