Feasibility of HVDC for Very Weak AC Systems with SCR below 1.5

González, Jorge W.; Weindl, Christian; Herold, G.; Retzmann, D.; Cardona, Hugo A.; Isaac, Idi A.; López, Gabriel

doi:10.1109/epepemc.2006.4778619

Cited by 13 publications

(4 citation statements)

References 9 publications

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“…Some special technique must be taken into consideration to increase the ESCR. STATCOM, for example, is a good choice [5].…”

Section: Inverter Commutation Failurementioning

confidence: 99%

“…Compared to the basic SCR from ac system, the ESCR increases by all the compensation devices mentioned above except capacitor banks and filters [5] [8]. Since reactive power requirement at inverter is about 50%~60% of the HVDC Capacity, so ESCR of HVDC transmission system with capacitor banks and filters is about (SCR−0.6).…”

Section: Ac/dc System Strength and Scrmentioning

confidence: 99%

“…The stronger the ac system is, the larger the SCR will be. A low SCR requires special techniques to achieve satisfactory system dynamic performance [5].The analysis of CF in multi-infeed systems indicates that local CF is mainly related to local SCR. The immunity level of CF occurrence is increasing as local effective SCR increases [6].…”

Section: Introductionmentioning

confidence: 99%

“…Digital simulation is more accurate to identify CF and assess the dynamics in ac/dc system. Simulations show HVDC control strategies can be designed to increase the system stability [5] [9].…”

Section: Introductionmentioning

confidence: 99%

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Impact of AC System Strength on Commutation Failure at HVDC Inverter Station

Wang

Cao

et al. 2012

2012 Asia-Pacific Power and Energy Engineering Conference

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Ac system strength indicated by short circuit ratio (SCR) and its impact on commutation failure in HVDC transmission system are studied. SCR is varying along with ac system operation mode, grid configuration, load characteristics and reactive power compensation devices at inverter station. Quasi-steady state calculations show that SCR increases commutation reactance and consequently increases the overlap angle of the inverter. Commutation failure occurs when inverter extinction angle is less than the minimum critical Value. Digital Simulation of a twoterminal HVDC transmission system using Matlab/Simulink program is presented. HVDC controllers are simulated and Voltage Dependent Current Limits (VDCL) function is added to increase the system stability.

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“…Some special technique must be taken into consideration to increase the ESCR. STATCOM, for example, is a good choice [5].…”

Section: Inverter Commutation Failurementioning

confidence: 99%

Section: Ac/dc System Strength and Scrmentioning

confidence: 99%