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Finite control set model predictive control techniques have been emerged as good alternatives in particularly for multilevel and multiphase power converters, for which switching vectors with multiple magnitudes/directions are available but the modulator or switching table design becomes complex. In this paper, a finite-control-set model predictive direct torque and power control (FCS-DTC-DPC) for...
This paper presents a deadbeat-like predictive encoderless control method for back-to-back power converter permanent-magnet synchronous generator (PMSG) wind turbine systems with Extended Kalman Filter (EKF). The generator state variables are estimated through an EKF observer requiring neither the knowledge of mechanical parameters nor the initial position of the rotor. The estimated speed and position...
This work presents a back-to-back power converter Permanent-magnet Synchronous Generator (PMSG) wind turbine real-time simulation system based on FPGA Hardware-in-the-Loop (HiL) concept. The proposed system can be used for Electric Control Units (ECUs) evaluation in a real-time manner. The refreshing rate effect of a HiL emulator is discussed and analyzed with real-time simulation proof. Within this...
This paper presents encoderless model predictive control scheme with time-varying sliding mode observer for a complete wind turbine system. The wind turbine system consists of a back-to-back converter (AC/DC/AC) and a direct-drive permanent-magnet synchronous generator (PMSG). We give a complete model of the system and present encoderless fixed-frequency model predictive direct torque control of the...
For high-speed motor unit, in particular, it is very important to accurately predict natural frequencies and vibration modes of shafting at the design stage so as to minimize the likelihood of failure. Finite element (FE) analysis and experimental measurements are used to establish the natural frequencies and modes of multi-span shafting coupled by flexible coupling, and to assess the influence of...
The design feature and performance analysis based on circuit-field coupled finite element analysis of large scale direct-driven permanent magnet (PM) generators are introduced. Some experimental results are presented. The simulation and experimental results of a 1.5MW PM wind generator show that the pole-slot number combination has an important impact on the machine properties, and the optimization...
The main advantages of the high speed machine are small size and high power density. However, the high speed machine suffers from higher loss density and cooling difficulty due to small cooling area, especially the high frequency harmonic currents produced by the power conversion system increase the loss and temperature of high speed machine. The output high frequency AC power of the high speed PM...
Recently more attention has been paid to the distributed power systems due to their high flexibility and reliability. The high speed permanent magnet (PM) generator driven by micro-turbine has been widely investigated since it has small size, high efficiency and power density. Since the micro-turbine cannot be self started, the PM generator has to operate as a motor for the system staring, which needs...
Recently more attention has been paid to the distributed power systems due to their high flexibility and reliability. The high speed permanent magnet (PM) generator driven by micro-turbine has been widely investigated since it has small size, high efficiency and power density. The output high frequency AC power of the high speed PM generator needs to be converted into the AC power with constant frequency...
The permanent magnet (PM) generator direct-driven by wind turbine has the advantages of high efficiency, simple structure and reliable operation, and the features of low speed, multi-pole and large size. How to utilize sufficiently the structural dimension, improve the performance and reduce the cost of the machine by proper choice of the pole number and stator slot number is an important problem...
There is increasing interest in high speed machines for industry applications due to the merits of high power density and small size. However, the heat dissipation of the high speed machine becomes a series problem also due to the small size and high power loss density. Therefore, how to estimate accurately the power losses and temperature rise is a big issue for the high speed machine design. In...
The dual stator winding structure (the power winding and compensating winding) is used to improve the dynamic performance of the induction generator. The constant output voltage of the power winding is kept through the input voltage regulation of the compensating winding. The dual stator induction generator system is controlled by a fuzzy controller for improving dynamic response. The modeling and...
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