This paper proposes a 60 Hz equivalent to the CIGRE benchmark model (CBM) for HVDC control studies. Component configuration and system impedances of the PSCAD/EMTDC implementation of the CBM are modified to arrive at the 60 Hz equivalent model. These parameter changes are discussed and validation is given. Simulations are conducted in steady state and compared to that of the CBM. The response of the proposed equivalent to a current order step-response and AC faults are compared to that of the CBM. The performance comparisons match closely and this paper concludes that the proposed 60 Hz equivalent is adequate for use when running simulations that require an HVDC benchmark model be connected to a representation of a 60 Hz AC network.

Summary form only given. The commutation failure vulnerability of multi-infeed HVDC converters to ac side faults is analyzed. Faults in multi-infeed systems can cause commutation failure events in the nearby local converter or concurrently in both converters. The immunity of the system to both these events is investigated and suitably parameterized. "Commutation Failure Immunity Index" (CFII) is calculated for multi-infeed systems with different ratings. Anomalous failure in valve current commutation due to voltage distortion has been investigated.

The commutation failure vulnerability of multi-infeed HVDC converters to ac side faults is analyzed. Faults in multi-infeed systems can cause commutation failure events in the nearby local converter or concurrently in both converters. The immunity of the system to both these events is investigated and suitably parameterized. “Commutation Failure Immunity Index” is calculated for multi-infeed systems with different ratings. Anomalous failure in valve current commutation due to voltage distortion has been investigated.

The sensitivity of the indices used in the analysis of the multi-infeed HVDC systems to the converter type has been analysed. Specifically, the impact on MIIF and CFII has been analyzed in more detail. The test system comprises the inverter of one HVDC system and the rectifier of another scheme connected to the same ac network. (5 pages)

The commutation failure vulnerability of single and multi-infeed HVDC converters to AC side faults is analysed. A new indicator of the susceptibility of the converter to commutation failures the "commutation failure immunity index" (CFII) is proposed. Faults in multi-infeed systems can cause commutation failure events in the nearby local converter or concurrently in both converters. The immunity of the system to both these events is investigated and suitably parameterized.

Voltage sourced converter based high voltage DC transmission (VSC-HVDC) is an emerging technology for the efficient transfer of energy. Because it uses gate turn-off semiconductor devices, such as GTO or IGBT, the VSC-HVDC option offers several advantages over conventional HVDC transmission. It can operate into very weak AC systems as well as provide auxiliary services such as reactive power support to the AC network, although it currently suffers from higher losses and lower power ratings. As this is an emerging technology, it is important to develop tools and models for the study of VSC-HVDC in various operating conditions. With this in mind, the paper develops an electromagnetic transient simulation model of a 300 MW VSC-HVDC scheme that can be used for investigating its operation. A decoupled control system is developed and the transient performance and fault behavior of the system is studied under different short circuit ratio (SCR) conditions.