An incremental transformer model for the study of harmonic overvoltages in weak AC/DC systems
- Dept. of Electrical Engineering, West Virginia Univ., Morgantown, WV (US)
- Dept. of Electrical Engineering, Univ. of Patras, Patras (GR)
This paper develops an incremental transformer model suitable for slow transient studies. A typical application is the study of temporary harmonic overvoltages in ac/dc systems caused by transformer saturation. The proposed model represents in detail the nonlinear magnetic circuit of the transformer and is, therefore, more complex than the piecewise linear models often used to simulate saturation. Despite its complexity, the model formulation is suitable for direct solution at each integration step and this results in reasonable simulation time. The proposed model is particularly suitable for HVDC system studies since only a few elements of the transformer matrix need be updated at each switching instant to account for the switching action of the converter valves. A study of temporary overvoltages in a weak ac/dc system is presented in this paper. Two types of disturbances leading to temporary harmonic overvoltages are simulated using both the piecewise linear and the proposed incremental transformer model. Comparison of the simulation results indicates that the proposed model can be successfully used for the validation of temporary overvoltage studies conducted with simpler and faster transformer models.
- OSTI ID:
- 6494872
- Journal Information:
- IEEE Trans. Power Del.; (United States), Vol. 3:3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
29 ENERGY PLANNING
POLICY AND ECONOMY
20 FOSSIL-FUELED POWER PLANTS
AC SYSTEMS
OVERVOLTAGE
HVDC SYSTEMS
TRANSFORMERS
SIMULATION
ELECTRICAL TRANSIENTS
DC SYSTEMS
ELECTRICAL EQUIPMENT
ENERGY SYSTEMS
EQUIPMENT
POWER SYSTEMS
TRANSIENTS
VOLTAGE DROP
200302* - Power Transmission & Distribution- DC Systems- (1989-)
200301 - Power Transmission & Distribution- AC Systems
EHV & UHV- (-1989)
296002 - Energy Planning & Policy- Electric Power Transmission & Distribution- (-1989)
200104 - Fossil-Fueled Power Plants- Components