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This paper presents real-time simulation of both Type-III and Type-IV wind turbines connected to the power grid. Detailed switching models of the converter are used in conjunction with complete turbine and converter control models to evaluate the feasibility of real-time simulation using commercial real-time simulation platforms. In addition to time-domain responses, frequency-domain characteristics,...
In order to protect the converter of doubly fed induction generator(DFIG) and realize low voltage ride through(LVRT) during grid faults, the crowbar is usually used , since the resistor value of the crowbar effects DFIG's rotor current, reactive power output and electrical torque, it 's design is very crucial for LVRT.A novel optimal design of DFIG crowbar resistor for fault ride-through is proposed...
We have developed a mathematical model for permanent magnet synchronous motors (PMSMs). The nonlinear characteristics of this model are expressed using a total of eight constants. The magnet flux characteristics of PMSMs can be obtained by using this simplified model. This model can also be transformed into a reverse function, and motor drive simulation including nonlinear characteristics can easily...
This paper overviews recent technical trends of research and development of non rare-earth permanent magnet motors. In particular, switched reluctance motors (SRMs) made of recent developed core materials and flux switching machines (FSMs) are reviewed.
The paper is concerned with the active and reactive power flow between the doubly fed induction generator harvesting wind power and the grid controlled by the rotor side converter. After deriving the basic equations in Appendices it builds up a block diagram for studying the dynamic processes and it applies them for investigating the slip - rotor current characteristics where rotor voltage components...
Hybrid Vehicles (HEVs) and Electric Vehicles (EVs) improve the efficiency of a drive and reduce CO2 emissions by regenerative braking and operating the engine under optimum conditions. It is desirable to decrease the motor size and increase the maximum torque to minimize the driving units. For these purposes, motors employing permanent magnets have been commonly used recently. For HEVs and EVs motors,...
The design of optimized modulation schemes at low pulse ratios, e.g. Selective Harmonic Elimination (SHE), has been widely studied. However, most previous work has focused on half-wave symmetry pulse patterns. For variable speed and variable torque applications, non-half-wave symmetry SHE modulators depending on the power factor angle still achieve highly efficient inverters in many power factors...
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