tailieunhanh - Recent Developments of Electrical Drives - Part 40

Recent Developments of Electrical Drives - Part 40. The book stating the recent developments of electrical drives, can be useful for engineers and researchers investigating and designing electrical and electronic devices as well as for students and young researchers dealing with electrical and electronic engineering, computer sciences (advanced computer modelling, sophisticated control systems with artificial intelligence tools applied, optimal design bye use of classical and genetic algorithms employed), applied mathematics and all the topics where electromagnetic, thermal, mechanical phenomena occur | . Maximum Wind Power Control in Wind Diesel System 391 ECc and ECd design the electromotive force when the battery is completely charged and discharged respectively. The battery is represented by a voltage source in series with a resistance and capacitance. The internal resistance Rbat is assumed to be constant and the internal voltage Ebat varies with state of charge. The internal terminal voltage Vs in discharge and charge operations is given respectively by 14 Vs Ebat - IbatRbat Vs Ebat IbatRbat 23 24 Ibat is the battery current. In steady state the terminal voltage of the capacitance is negligible. In our case the battery current will have two different expressions _ Ebat i EfO 4pZT Idlscharge 2Rbat 2 R- Rbat I _ Ebat 1 Ebat 4Pout Icharge 2Rbat R Rbat Pout is the power delivered or received by the battery. The state of charge of the battery may be calculated by CSOC_discharge I Idischarge dt Ccap 3600 Jt 0 Csoc-Charge Ccap 3600 L0Ichargedt 25 26 27 28 Ccap is the capacity of the battery in Ampere-hours and d sch - M are efficiency factors of discharge and charge operations respectively. The Csoc can have a value between 0 and 100 . The 0 corresponds to a fully discharged state and 100 correspond to a fully charged state. Control strategy Unfortunately the wind energy is not completely predictable and it fluctuates rapidly. As a result it is difficult to balance the system. For efficient capture of wind power turbine torque or turbine speed should be controlled to follow the optimal tip-speed-ratio TSR . Our study is based on the current control of the wind generator Fig. 1 . Assuming that the permanent magnet generator torque is proportional to the machine current the control structure allows the torque and rotational speed to be controlled. The reference current of the wind generator rectified current is calculated for steady state points where the turbine torque and the generator torques are equals. dcu ä Tt T Tg 29 392 El Mokadem et al. 300 250 200 g

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