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Sensorless Control of Double Fed Machine for Wind Power Generators
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| Author(s) |
E. Bogalecka; Z. Krzeminski |
| Abstract |
Energy conversion in wind power generators takes place with speed variation within a limited range. In such applications a double fed machine (DFM) becomes very interesting solution in comparison with synchronous machine and squirrel cage induction machine [1]. The DFM working as a generator parallel to the grid should be a controlled source of active and reactive power. High quality of electrical energy production requires decoupled control of both powers. In addition a variable torque produced by the wind should not influence the active power of generator. The reference value of reactive power is often set to zero. Requirements may be fulfilled by proper control system choice. Different schemes of the DFM control system can be proposed. In the paper two control method of the DFM with different principle of the control system synthesis and a different principle of the VSI control are presented. Both systems are sensorless.. In the first proposal a new model of the machine, called multiscalar model developed by Krzemiñski [7] is used for control system synthesis. Nonlinear feedback, based on this model transforms the system into two independent linear subsystems: mechanical and electromagnetic. The inverter is controlled by a voltage PWM algorithm. A rotor position is estimated. The second presented control system is simpler. Synthesis of the control system is based on a vector control theory. An additional angle controller is used to synchronise rotor with the stator [3], instead of the rotor position sensor. The inverter is current controlled. To obtain a constant switching frequency of the inverter a predictive current controller is used [8]. Features of the machine control system depend on the system structure, controllers settings and on the method of the inverter output voltage control. Features of both systems are simulation investigated and compared. |
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| Filename: | EPE-PEMC2002 - T9-046 - Bogalecka.pdf |
| Filesize: | 318.5 KB |
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| Type |
Members Only |
| Date |
Last modified 2004-05-25 by System |
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