Control Aspects of the Brushless Doubly-Fed Machine : Final Report.
This report covers the investigations into the control aspects of a variable-speed generation (VSG) system using a brushless double-fed generator excited by a series-resonant converter. The brushless double-fed machine comprises two sets of stator 3-phase systems which are designed with common windings. The rotor is a cage rotor resembling the low-cost and robust squirrel cage of a conventional induction machine. The system was actually designed and set up in the Energy Laboratory of the Department of Electrical and Computer Engineering at Oregon State University. The series-resonant converter designed to achieve effective control for variable-speed generation with the brushless doubly-fed generator was adequate in terms of required time response and regulation as well as in providing for adequate power quality. The three elements of the VSG controller, i.e., voltage or reactive power controller, the efficiency maximizer and the stabilizer, could be designed using conventional microprocessor elements with a processing time well within the time period required for sampling the variables involved with executing the control tasks. The report treats in detail the stability problem encountered in running the machine at certain speed regions, even if requirements for steady-state stability are satisfied. In this unstable region, shut down of the VSG systemmore »
- Publication Date:
- OSTI Identifier:
- Report Number(s):
- DOE Contract Number:
- Resource Type:
- Technical Report
- Research Org:
- Oregon State Univ., Corvallis, OR (USA). Dept. of Electrical and Computer Engineering
- Sponsoring Org:
- United States. Bonneville Power Administration.
- Country of Publication:
- United States
- 13 HYDRO ENERGY; 17 WIND ENERGY; 36 MATERIALS SCIENCE; CONTROL EQUIPMENT; DESIGN; ELECTRIC GENERATORS; HYDRAULIC TURBINES; SPEED REGULATORS; WIND TURBINES; DC TO DC CONVERTERS; FLOWSHEETS; POWER GENERATION; PROCESS CONTROL; PROGRESS REPORT; RESPONSE FUNCTIONS; ROTORS; STABILITY; STATORS; VARIATIONS; VELOCITY; VOLTAGE REGULATORS; CONTROL; DIAGRAMS; DOCUMENT TYPES; ELECTRICAL EQUIPMENT; EQUIPMENT; FUNCTIONS; MACHINERY; TURBINES; TURBOMACHINERY Electric motors, Brushless; Variable speed drives 130700* -- Hydro Energy-- Power-Conversion Systems; 170603 -- Wind Energy Engineering-- Power-Conversion Systems