Testing of SVC Compensation and Filtering Performance with Tokamak PF Converter

Wu, Yanan; Xu, Leijun; Fu, Peng; Dong-liang, Jiao; Ji, Yue; Mao, Huafeng; Li, Jun; Yuan, Hongwen; Zhai, Wenbo

doi:10.1007/s10894-014-9762-x

Cited by 11 publications

(3 citation statements)

References 3 publications

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“…The trigger angle varies dramatically with each 3.3 ms (12‐pulse mode). This control method will produce large unstable transient low‐order harmonics and reactive power fluctuation . As shown in Figure , the converters generate up to 408 A of second‐order harmonic current on the network side of the rectifier transformer at testing point T1.…”

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

confidence: 99%

“…This control method will produce large unstable transient low-order harmonics and reactive power fluctuation. 11 As shown in Figure 3, the converters generate up to 408 A of second-order harmonic current on the network side of the rectifier transformer at testing point T1. 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.…”

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%

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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“…To solve the problem, some measures have been taken to compensate for the reactive impulse power of fusion devices. In ITER, the requirement is satisfied with a huge reactive power compensation and harmonic filtering system (RPC&HF), rated for 750 Mvar in total, based on thyristor-controlled reactors (TCRs) and passive tuned filters [15,16]. Moreover, in the second phase of plant operation for ITER, the static synchronous compensator (STAT-COM) or active power filter (APF) is considered to be added for reactive power and harmonic compensation in the future to meet the increasing requirements of operation.…”

Section: Introductionmentioning

confidence: 99%

Research on a Novel Hybrid Power Supply Scheme with Energy Storage Technology for Tokamak

Tian

Lü

et al. 2023

International Journal of Energy Research

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Megawatt-impulse power generated by Tokamak fusion devices seriously threats to the stable operation of the whole system. The current power supply scheme needs to leave large redundancy to suffer such a huge power impact, resulting in a high cost of the power supply system. Moreover, no reasonable configuration for impulse power and stable power causes unnecessary waste of power supply capacity. The rapid development of energy storage technology provides a potential approach to solve the operation stability problem caused by large amounts of power impact. Thus, a novel hybrid power supply scheme is creatively put forward with centralized energy storage, which can effectively decrease the voltage level of the grid and achieve smooth connection into the public grid when validly compensating for the impulse power. The cost evaluation model and principles are proposed to analyze and assess the economic advantages of the hybrid power supply scheme with centralized energy storage. Finally, a power scenario based on the international thermosnuclear experimental reactor (ITER) is applied as a case study of the cost evaluation model for various schemes, and the results verify that the novel hybrid power supply scheme has benefits on economics and the capacity of the grid over other schemes.

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A novel phase-locked loop applied on frequency fluctuation of EAST power supply

Tan

et al. 2020

Energy Reports

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Testing of SVC Compensation and Filtering Performance with Tokamak PF Converter

Cited by 11 publications

References 3 publications

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

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

Research on a Novel Hybrid Power Supply Scheme with Energy Storage Technology for Tokamak

A novel phase-locked loop applied on frequency fluctuation of EAST power supply

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