Thispaperpresentsatechniqueforderivingthe linearized Harmonic State Space model of a power electronic converter.TheHarmonicStateSpacemodel,inwhichharmonics of state variables, inputs and outputs are posed separately in a State Space form, can be used for dynamic small signal studies, and for harmonic steady state studies. The technique can handle autonomous switches such as diodes, and controlled switches such as IGBTs and GTOs. The technique is demonstrated by modeling a Buck-Boost converter. The HSS of the Buck-Boost converter is compared to a PSCAD-EMTDC model. This is presented as a demonstration of a general technique that is extendable to common HVdc and FACTs device modeling.

The existing HVDC scheme connecting the North Island and the South Island of New Zealand is presently being upgraded to 1400 MW. As part of the HVDC upgrade, a time domain simulation model of the interconnector is developed and presented in this paper. The model will be used to study transient stability and the dynamic performance of the HVDC link and both interconnected power systems. Special features of the model are several power modulation controllers designed for frequency and voltage support and the utilization of a round power operation mode.

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