Showing papers by "Neville R. Watson published in 1997"
17 Sep 1997
191 citations
01 Mar 1997
TL;DR: In this paper, the authors derived single-phase and three-limb three-phase transformer models using a unified magnetic equivalent circuit concept and verified the new models with laboratory and field data, making a comparison between the transient performance of HVDC converters with conventional and proposed transformer models.
Abstract: In electromagnetic transient simulation HVDC converter transformers are normally represented as magnetically independent single-phase units. However, three-limb converter transformers are often used in HVDC schemes. Single-phase and three-limb three-phase transformer models are derived using a unified magnetic equivalent circuit concept. The new models are verified with laboratory and field data. Also, a comparison is made between the transient performance of HVDC converters with conventional and proposed transformer models.
44 citations
TL;DR: In this paper, the power converter steady state is solved by Newton's method, and the advantages of both frames of reference can be derived by a judicious use of the sequence transform, interfacing a Newton solution in sequence components, to a power converter model in phase components.
Abstract: In the steady state, the AC/DC power converter couples harmonics on the DC side with sequence component harmonics on the AC side. A solution for the power converter in sequence components may be more efficient than one in phase components. Since most other power system steady-state analysis is framed in sequence components, so too must the power converter analysis be-if a unified solution is to be achieved. However in order to model the commutation process, existing power converter models suitable for iterative steady-state analysis are necessarily framed in phase components. When the power converter steady-state is solved by Newton's method, the advantages of both frames of reference can be derived by a judicious use of the sequence transform, interfacing a Newton solution in sequence components, to a power converter model in phase components.
17 citations
26 Sep 1997
TL;DR: NEPLAN as mentioned in this paper is one of the most complete planning, optimization and simulation tools for transmission, distribution, generation and industrial networks and has been successfully applied all over the world.
Abstract: Successfully applied all over the world NEPLAN one of the most complete planning, optimization and simulation tool for transmission, distribution, generation and industrial networks.
3 citations