Type of Document Master's Thesis Author Tinsley III, Carl Terrie Author's Email Address firstname.lastname@example.org URN etd-08202003-104831 Title Modeling of Multi-Pulse Transformer/Rectifier Units in Power Distribution Systems Degree Master of Science Department Electrical and Computer Engineering Advisory Committee
Advisor Name Title Boroyevich, Dushan Committee Chair Baumann, William T. Committee Member Lai, Jason Committee Member Keywords
- Average Model
- Multi-Pulse Transformer
- Small-Signal Stability
Date of Defense 2003-08-05 Availability unrestricted AbstractMulti-pulse transformer/rectifier systems are becoming increasingly popular in power distribution systems. These topologies can be found in aircraft power systems, motor drives, and other applications that require low total harmonic distortion (THD) of the input line current. This increase in the use of multi-pulse transformer topologies has led to the need to study large systems composed of said units and their interactions within the system. There is also an interest in developing small-signal models so that stability issues can be studied.
This thesis presents a procedure for the average model of multi-pulse transformer/rectifier topologies. The dq rotating reference frame was used to develop the average model and parameter estimation is incorporated through the use of polynomial fits. The average model is composed of nonlinear dependent sources and linear passive components. A direct benefit from this approach is a reduction in simulation time by two orders of magnitude. The average model concept demonstrates that it accurately predicts the dynamics of the system being studied. In particular, two specific topologies are studied, the 12-pulse hexagon transformer/rectifier (hex t/r) and the 18-pulse autotransformer rectifier unit (ATRU). In both cases, detailed switching model results are used to verify the operation of the average model. In the case of the hex t/r, the average model is further validated with experimental data from an 11 kVA prototype. The hex t/r output impedance, obtained from the linearized average model, has also been verified experimentally.
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