Prediction of core saturation instability at an HVDC converter

Burton, R.S.; Fuchshuber, C.F.; Woodford, Dennis; Gole, A.M.

doi:10.1109/61.544283

Cited by 19 publications

(5 citation statements)

References 3 publications

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“…The electromagnetic coupling of an AC line in normal operation induces a fundamental frequency AC circulating current along the DC coupled line. That current, driven into the thyristors of the converter or inverter station, is naturally switched to a DC current; which flowing through the HVDC transformer valve winding, causes an increment in the core saturation [93] and results in a core saturation instability [94].…”

Section: ) Electromagnetic Coupling Effectmentioning

confidence: 99%

Comprehensive Overview on HVDC Converter Transformer Design: Additional Discussions to the IEC/IEEE 60076-57-129 Standard

Czernorucki¹,

Salles²,

Costa³

et al. 2022

IEEE Access

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HVDC has been chosen as an economical and technical solution for power transmission through long distances, asynchronous interconnections and long submarine cables crossing. Despite DC transmission benefits to power systems, the converters non-linearity produces undesirable effects to the converter transformer in service, mainly listed in the technical standard IEC/IEEE 60076-57-129. However, additional discussions and complementary information can be found in a plurality of references, which are brought in the article under a comprehensive overview perspective. Some design solutions deal with these effects increasing the technical margins, which have direct influence on manufacturing costs and transformer reliability and availability levels. This article goes through the main topics pointed by the standard and the references, investigating their consequences in the converter transformer operation, in order to provide a comprehensive tutorial on design solutions and considerations to deal with those undesirable effects. HVDC, transformer, standard, design. INDEX TERMS

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Section: ) Electromagnetic Coupling Effectmentioning

confidence: 99%

Comprehensive Overview on HVDC Converter Transformer Design: Additional Discussions to the IEC/IEEE 60076-57-129 Standard

Czernorucki¹,

Salles²,

Costa³

et al. 2022

IEEE Access

View full text Add to dashboard Cite

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“…During this period, a sudden increase in power will take place between adjacent AC transmission lines [5], which will cause the voltage to decrease and the current to temporarily increase. As a result, on the inverter AC side, harmonic components appear, which are quite different from the ones in conventional AC transmission [6]. During this time, the inverter station acts as a harmonic source [7], with the harmonic components being higher than those in the traditional transmission line, and will not attenuate over time [8].…”

Section: Introductionmentioning

confidence: 99%

Research on fault location scheme for inverter AC transmission line of AC–DC hybrid system

Deng

et al. 2018

IEEJ Transactions Elec Engng

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memberAs the nonlinear characteristics of converters, the harmonic components of fault information hardly decays with the passage of time, which introduces an estimation error in the fault location in the inverter AC transmission line of an AC-DC hybrid system, especially under commutation failure condition. Therefore, a new fault location scheme, which combines the dynamic synchrophasor measurement algorithm and line equivalent impedance/admittance estimation algorithm, is proposed in this paper. The precision of phasor estimation under harmonic environment has been improved. Based on these, the pre-fault data of one circle is applied to estimate the line equivalent impedance and admittance. Finally, the traditional fault location formula based on the two-end information is employed to calculate the fault location. Evaluation results show that the proposed scheme is independent of the fault resistance, fault distance, and fault type. More importantly, it ensures a higher precision of fault location in comparison with the dynamic fault location algorithm, even under commutation failure.

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“…Actually already in the 1990s, the so-called "core saturation instability" had been reported in the Line-Commutated Converter (LCC) based High Voltage Direct Current (HVDC) transmission system [5], where the 2nd harmonic generated by the transformer after faults was amplified due to the interaction of the LCC and the saturated transformer. This 2nd harmonic amplification is mainly caused by the dynamic interactions between the ac and dc sides of the LCC-HVDC transmission system and is most likely to occur if the resonance frequencies of the ac and dc side networks are close to 2f 1 and f1, respectively [6].…”

Section: Introductionmentioning

confidence: 99%

Modeling and Analysis of 2nd Harmonic Interaction for VSC with Transformer under Saturation Condition

Yang

Wang

Blaabjerg

et al. 2018

2018 IEEE International Power Electronics and Application Conference and Exposition (PEAC)

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This paper investigates the mechanism behind the 2nd harmonic interaction of a transformer connected Voltage-Source Converter (VSC) under saturation conditions. The detail small-signal models of a saturated transformer and a VSC are derived considering their nonlinear behavior. It is revealed that the frequency coupling from the saturated transformer and the PLL in the VSC may form a positive feedback loop and give rise to a 2nd harmonic amplification. The harmonic amplification gain is established herein, which provides an accurate assessment of the 2nd harmonic interaction. This theoretical analysis is verified by a power hardware in the loop laboratory experiment.

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Prediction of core saturation instability at an HVDC converter

Cited by 19 publications

References 3 publications

Comprehensive Overview on HVDC Converter Transformer Design: Additional Discussions to the IEC/IEEE 60076-57-129 Standard

Comprehensive Overview on HVDC Converter Transformer Design: Additional Discussions to the IEC/IEEE 60076-57-129 Standard

Research on fault location scheme for inverter AC transmission line of AC–DC hybrid system

Modeling and Analysis of 2nd Harmonic Interaction for VSC with Transformer under Saturation Condition

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