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A novel variable-speed wind power generation system with constant-frequency double-rotor (CFDR) generator is proposed which combines the advantages of low cost, good dynamical performance and high reliability. In this paper, the structure of the proposed wind power generation system is introduced and the working principle of the CFDR generator is presented. The control strategy of the wind power generation...
In this paper, a novel control algorithm for optimal operating efficiency of induction generators for wind power generation is presented. The proposed method is based on the flux level reduction, where the flux level is computed from the machine model for the optimum d-axis current of the generator. For the vector-controlled induction generator, the d-axis current controls the excitation level in...
Wind power, as an important and promising renewable resource, is widely studied. Because the wind is highly variable, it is very desirable to operate a wind turbine at variable speeds. In this respect, doubly fed induction generator (DFIG) has become popular in wind power generation system. The steady state simulation analysis of a DFIG is essential to understand the behavior of DFIG such that it...
Doubly-fed induction generator (DFIG) based wind power generation is connected to power grid via an electrical conversion system which consists of two back-to-back connected voltage source converters, i.e., rotor side converter (RSC) and grid side converter (GSC). Both converters have the same topology and working principles with different functions during operation. Hence, the characteristics and...
In the widely applied non-direct driven wind power generation system, a gearbox is connected between the wind turbine and the high speed doubly-fed induction generator (DFIG) so that the system could be smaller and supply power with constant voltage and constant frequency as the wind turbine speed varies. However, the multi-level mechanical gearbox is rather vulnerable and poses many difficulties...
Dual mechanical port machine (DMP) - a kind of continuous electrical variable transmission, is a very competitive alternative for vulnerable constant speed-ratio mechanical gearbox in high capacity wind power generation system. As the inner rotor is surrounded by the stator and the outer rotor, the DMP machine suffers from PM demagnetization and insulation failure under severe thermal condition. To...
The brushless doubly fed machines (BDFM) have been widely researched. The BDFM system has lots of advantages such as brushless, simplicity, robustness and reliability, and a much smaller power electronic converter compared to a conventional AC induction machine. The BDFM as a new type of AC machine and is attractive for converter-fed variable speed drive applications and variable-speed constant-frequency...
In MW wind power generation system(WPGS), This paper analyzes the rotor flux oriented vector control theory for permanent magnet synchronous generator (PMSG), a control strategy of grid connected based on adaptive resonant regulator the method described a PLL-based speed and position controller for PMSG drives. 20 KW PMSG wind power system is constructed in the laboratory, which proves the validity...
In this paper, based on a dual mechanical port machine (DMPM), a novel dual power flow wind power generation system (DPF-WPGS) is proposed and analyzed. The operation principle of DPF-WPGS and the dynamic model of DMPM are introduced. The control strategies are analyzed and simulated in Matlab/Simulink. To evaluate the performance of DMPM-based WPGS, two other conventional WPGSs, namely, the direct-drive...
The doubly excited brushless reluctance machine (DEBRM) is a new type of reluctance machine and is attractive for variable-speed constant-frequency wind power generation systems. The DEBRM system features not only simplicity, robustness and reliability of the reluctance or cage-rotor inductance machines, but a much smaller power electronic converter, compared to a conventional AC induction machine...
A detailed mathematical model of doubly-fed induction generator (DFIG) is derived according to generator convention. A novel S-Function is proposed to describe the mathematical model of DFIG. The simulation subsystems of no-load operation and generator operation are developed based on state equations. The control of the rotor current inner loop and the rotating speed outer loop are designed based...
This paper proposes a nonlinear control design technique for wind generation systems that deals with both active power and reactive power at the same time in consideration of the fact that the wind generation system is a high order nonlinear dynamical system. Unlike the existing controller designs, the proposed technique is developed based on original nonlinear models of electric machine and wind...
Power relations of doubly fed induction generator (DFIG) wind power generation system are analyzed. Based on this, a method is proposed to calculate the reactive power limit. Furthermore, the reactive power control of DFIG wind farm is studied and the control scheme is provided to exert the reactive power dealing capability of wind power system. A reactive power compensation strategy for the local...
Brushless doubly-fed machine (BDFM) has two sets of winding on the stator, the power winding connect with constant frequency constant voltage three-phase power frequency electrical source ,the controlled winding connect with the matrix converter (MC). MC possess the capability of bi-directional power flow, can simultaneously provide sinusoidal input current and output voltage. The phase of input current...
Wind energy is a significant and powerful natural resource that is safe, clean, and abundant. However, wind energy has a drawback of having only 1/800 density as compared to that of water energy, and it is not constant and wind turbine output is proportional to the cube of wind speed, which causes the generated power of wind turbine generator (WTG) to fluctuate. In this paper, a technique is proposed...
This paper presents a real time simulation method of wind power generation system with doubly fed induction generator (DFIG) using real time digital simulator (RTDS). A vector control strategy is proposed to realize decoupled control of real power and reactive power. Rotor side converter controls the complex power of stator while grid side converter regulates the DC link voltage and the reactive power...
The variable speed constant frequency (VSCF) wind power generation system requires the DFIG with characteristics of high response speed as well as strong robustness. Under the mutual effects of internal interference of parametric variation and external interference of load torque oscillation, the dynamic current response of PI control becomes worse, as well as reduced efficiency and stability. Aiming...
A novel dual power flow wind power generation system based on electrical variable transmission (EVT) is proposed which combines the advantages of direct-driven and non-direct-driven systems. In this paper, the principles of the dual power flow wind power generation system are presented. The dynamic model and operation modes of the double layer permanent magnet outer rotor based EVT are introduced...
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