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Model predictive control (MPC) achieves very quick dynamic response with simple concept by selecting the best voltage vector minimizing the errors between the reference value and the feedback value. However, the steady state performance is still not satisfactory and it presents variable switching frequency. Introducing duty cycle control into MPC can improve the steady state performance but the control...
Due to the execution delay of the control signal caused by digital controller, there is one sampling time delay between the required optimal switching state and the executed switching state under the conventional model predictive controlled (MPC) systems, which lowers the system performance. In this paper, a two-step model predictive control (TS-MPC) strategy is proposed for a dual induction motor...
The purpose of this paper is to find an innovative, high efficiency, practical and low cost control system structure with an optimized control strategy for small-scale grid-connected wind turbine with direct-driven permanent magnet synchronous generator (PMSG). This research adopts the sensorless vector control strategy based on phase-locked loop (PLL) for PMSG control, and the grid-side inverter...
This paper proposes a direct power control (DPC) strategy for cascaded brushless doubly fed induction generator (CBDFIG), which eliminates the slip rings and brushes in conventional DFIG wind turbine systems and features quick dynamic response and excellent steady state performance. Prior methods for controlling CBDFIG are based on vector control (VC), which is complicated and requires much tuning...
A model based predictive torque and flux control (PTFC) is proposed in this paper for doubly fed induction generator (DFIG) applied in wind energy applications. Different from the conventional switching-table-based direct torque control (DTC), which selects the output vector from a switching table, the developed PTFC selects the most suitable vector minimizing the errors of rotor flux and torque based...
Large torque ripple and variable switching frequency are the two most notable drawbacks of conventional switching table based direct torque control (DTC) for doubly fed induction generator (DFIG). By using one active vector and one null vector during one control cycle, the torque ripple can be significantly reduced while achieving almost constant switching frequency. This paper propose a very simple...
This paper presents a model based predictive direct power control (MPDPC) strategy to achieve soft and fast grid synchronization of doubly fed induction generator (DFIG) applied in wind energy applications. The future behavior of active and reactive powers is predicted in MPDPC using the discrete model of DFIG and the most appropriate voltage vector is selected to minimize the errors between the reference...
An off-line parameter identification of induction motor based on RLS algorithm was presented in the dissertation. Figuring out the Bart wirth digital filter state equation through improved euler numerical solution, the filtering value of signal was got, and the first-order derivative and the second-order derivative also were got directly. It avoids the error influence of derivative discretization...
This paper proposes a method to estimate the electrical parameters of Induction Motors, The electrical parameters are obtained by solving a least squares minimization problem, the method conceived to be used estimate parameters with the vector control strategy and the M sequence disturbing on the reference voltage. And experimental results are used to demonstrate the feasibility of the propose method.
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