The direct connection of generators to HVdc convertors with an emphasis on series excitation.
Thesis DisciplineElectrical Engineering
Degree GrantorUniversity of Canterbury
Degree NameDoctor of Philosophy
The underlying theme of this thesis has been the investigation of the direct connection of generators to HVdc converters. The first ever direct connection harmonic test measurements are presented. The accuracy of present steady state and dynamic simulation models is assessed. A novel variation of the direct connection, called the series excitation is proposed. In this system the dc line current is fed back in series with the dc output to provide the excitation requirements of the generators. A steady state formulation is developed to investigate its operational advantages and limitations. State variable and EMTDC models are used to predict the dynamic behaviour. The time consuming nature of dynamic simulation algorithms has encouraged the search for effective differential equation initialisation procedures. A Newton-Raphson technique is applied to a state variable transient converter simulation programme in a bid to reduce steady state computation times.