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This paper proposes predictive current control strategy based on predictive direct power control strategy for grid connected three phase voltage source inverter applications. The Proposed strategy uses a symmetrical 4+4 voltage vectors' sequence which selects two effective and two zero voltage vectors and determines concatenated voltage vectors' sequence. The time derivatives of currents for each...
In order to connect an LCL filter in a three phase system, two methods are possible. The first one is a wye connection and the second one is a delta connection. To study the stability problems, a mathematical model should be known, but the model of a delta connected LCL filter is not formulated. In this paper, a model with transfer functions is proposed for that purpose. Furthermore, this paper describes...
This paper investigates performances of an extended kalman filter (EKF)-based cost-effective drive system of a permanent-magnet synchronous motor (PMSM) for low-cost applications. In this paper, the EKF is used as a speed and position estimator and the motor is fed from a four-switch three-phase (FSTP) inverter instead of a conventional six-switch three-phase (SSTP) inverter. This configuration reduces...
An inductor-capacitor-inductor (LCL) filter are widely adapted in grid-connected inverter applications. In this paper, the harmonic attenuations of the LCL filter are quantitatively analyzed, and then the design optimization of two inductance values, which are related on a cost and a size, is illustrated. Based on the design optimization, the LCL filter employing a symmetric geometry is proposed....
This paper presents a robust current control in a three phase grid connected inverter using an LCL filter. This controller is based on the optimal control theory and typically designed in a complex-valued state-space. The proposed current controller has a robust tracking performance for the grid voltage harmonics and robustness to parameter error. Finally, the simulation results are presented to verify...
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