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The paper presents a comparison of the power output of wind driven generators coupled to active and passive converter circuits at certain site in Bulgaria. A table compares the power output difference expressed in percent. Actual wind resource data gives the opportunity to have evaluation and analysis at three different heights. Advantages of active and passive control are derived and summarized....
This paper presents multiple stage braking circuits for wind turbines with a permanent magnet synchronous generator. The system combines both passive converter circuit coupled to a resistive braking circuit. The second one is an over voltage protection when an emergency situation of no load is detected. The power converter control and braking are simulated and the output power/frequency graphics are...
The aim of the paper is to design and to do the fine tuning of a passive converter from a permanent magnet wind generator to a fixed DC link. It shapes a torque speed curve with only passive elements like diodes, inductors and capacitors. The result is a power/frequency (power/speed) characteristic close to the optimal one for wind turbines. The proposed novel circuit has the advantage to be a reliable,...
An electric brake for wind turbine systems is proposed in this paper. Effective emergency electrical braking is needed if an overvoltage occurs due to grid failure. The derived circuits use high power thyristors corresponding to the high values of generated power from today's wind turbines. A practical confirmation with BLDC a generator is ongoing in the laboratory. The principle of operation is proved...
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