Elimination of Commutation Failures of LCC HVDC System with Controllable Capacitors

Xue, Ying; Zhang, Xiaoping; Yang, Conghuan

doi:10.1109/tpwrs.2015.2491784

Cited by 127 publications

(85 citation statements)

References 15 publications

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“…The DC current increases more at the inverter side than at the rectifier side in all cases, because the difference between V dm2 (or V dm ) and V di was greater than V dr and V dm1 (or V dm ). Note that the minimum DC current was zero because the thyristor valves conduct only in one direction, which means that the DC current cannot be reversed [37,39]. Table 4 lists the maximum DC voltage and current arising from a single line-to-ground fault at the inverter side, according to four different DC-line models and real operating data.…”

Section: Case Study A: Comparision With Real Hvdc Systemmentioning

confidence: 99%

Modeling of HVDC System to Improve Estimation of Transient DC Current and Voltages for AC Line-to-Ground Fault—An Actual Case Study in Korea

et al. 2017

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Abstract:A new modeling method for high voltage direct current (HVDC) systems and associated controllers is presented for the power system simulator for engineering (PSS/E) simulation environment. The aim is to improve the estimation of the transient DC voltage and current in the event of an AC line-to-ground fault. The proposed method consists primary of three interconnected modules for (a) equation conversion; (b) control-mode selection; and (c) DC-line modeling. Simulation case studies were carried out using PSS/E and a power systems computer aided design/electromagnetic transients including DC (PSCAD/EMTDC) model of the Jeju-Haenam HVDC system in Korea. The simulation results are compared with actual operational data and the PSCAD/EMTDC simulation results for an HVDC system during single-phase and three-phase line-to-ground faults, respectively. These comparisons show that the proposed PSS/E modeling method results in the improved estimation of the dynamic variation in the DC voltage and current in the event of an AC network fault, with significant gains in computational efficiency, making it suitable for real-time analysis of HVDC systems.

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Section: Case Study A: Comparision With Real Hvdc Systemmentioning

confidence: 99%

Modeling of HVDC System to Improve Estimation of Transient DC Current and Voltages for AC Line-to-Ground Fault—An Actual Case Study in Korea

et al. 2017

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“…It is most often caused by AC system faults in the receivingend grid [1]. CF causes a drastic increase in DC currents at the DC side, which poses a serious threat to converter equipment, and causes temporary interruption of transmitted active power, leading to instability issues on the AC side [2]. Therefore, it is crucial to establish a systematic assessment method for CF caused by AC system faults, which can assist CF prevention and contingency response.…”

Section: Introductionmentioning

confidence: 99%

Assessment of commutation failure in HVDC systems considering spatial-temporal discreteness of AC system faults

Yang

Cai

et al. 2018

J. Mod. Power Syst. Clean Energy

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This paper presents a novel commutation failure (CF) assessment method considering the influences of voltage magnitude drop, phase shift, and spatial-temporal discreteness of AC system faults. The commutating voltage-time area is employed to analyze the spatial-temporal discreteness of AC system faults causing CF in high-voltage direct current systems, and the influences of fault position and fault time on CF are revealed. Based on this, a novel CF criterion is proposed, further considering the influence of voltage phase shift and the spatial-temporal discreteness. Then this research develops a new CF assessment method, which does not rely on electromagnetic transient simulations. A real case from the China Southern Power Grid is used to verify the practicability of the proposed method by comparing with simulation results obtained using PSCAD/EMTDC.

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Section: Technology Developmentsmentioning

confidence: 99%

“…In [69,70], a new approach was proposed to eliminate the commutation failure and provide fast dynamic reactive power/voltage control. In order to eliminate the commutation failure, a novel hybrid converter configuration for conventional LCC HVDC technology is proposed in [69]. Additionally, the control of AC voltage and reactive power in LCC HVDC system is investigated in [70] and a new control scheme is proposed, which makes the application of LCC HVDC system more flexible.…”

Section: Technology Developmentsmentioning

confidence: 99%

Review of Middle East energy interconnection development

Zhang

Song

et al. 2017

J. Mod. Power Syst. Clean Energy

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In recent years, the Middle East region countries have experienced rapid population and economy growth, which has resulted in large increase of energy and power demand. Although the traditional fossil fuels remain the majority for supplying the domestic demand, additional generating capacity and fuel supply are necessary according to current situation and future demand forecast. The renewable energy provides an alternative resource for satisfying demand, especially in this region with high potential of solar and wind energy. Besides the development of renewable energy, interconnected electricity networks also enable the cross-border power exchange to fulfil electricity demand. Many Middle East countries have already started developing renewable energy and reforming the national power sector for regional electricity integration. However, none of them has already implemented their targets and the challenges are still huge. This study reviews current conditions of electricity and energy interconnection development, and analyzes the process of regional electricity network integration and national power sector reforms and provides suggestion for regions' plan. Finally, the technology developments for future power grid interconnection and renewable energy integration are also reviewed.

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Elimination of Commutation Failures of LCC HVDC System with Controllable Capacitors

Cited by 127 publications

References 15 publications

Modeling of HVDC System to Improve Estimation of Transient DC Current and Voltages for AC Line-to-Ground Fault—An Actual Case Study in Korea

Modeling of HVDC System to Improve Estimation of Transient DC Current and Voltages for AC Line-to-Ground Fault—An Actual Case Study in Korea

Assessment of commutation failure in HVDC systems considering spatial-temporal discreteness of AC system faults

Review of Middle East energy interconnection development

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