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This paper proposes a general dwell-time equations for N-level inverter that are derived without the complex calculation. Contrary to the conventional method which has two dwell-time equations due to types, the proposed dwell-time equation is defined as one equation without the separated types. This method proceeds following step. After the voltage reference in abc-coordinate are transformed to alpha...
This paper proposes a new sensorless control scheme of non-salient pole permanent magnet synchronous motors (PMSMs). To solve the drawback of Extend Kalman Filter (EKF) needing long computation time, a new sensorless scheme is achieved by using a parallel structure of EKF model, which alternatively operates at the sampling period. The proposed scheme can greatly save computation time with a similar...
The propose of this paper is to present the systematic processes of constructing the averaged small-signal model of the three-phase grid-connected three-level neutral-point-clamped inverter with a LCL filter and to design the control system for the grid current by using the model. The systematic processes are composed of the averaging, perturbing and linearizing step about the circuit equations. In...
In this paper, the improved stator flux estimator has been proposed to ensure a Programmable Low Pass Filter (PLPF) to act as a pure integrator for sensorless control of induction motors. In a conventional PLPF, the estimated synchronous angular speed is used as a cutoff frequency of a PLPF whose gain and phase compensator is determined on the assumption of the estimated synchronous angular speed...
This The accurate current control is essential in high performance Interior Permanent magnet synchronous motors (IPMSM) drives. This paper proposes a predictive current control for a high accuracy and a fast dynamic response. The proposed predictive current control consists of the predictive current control and the Extended Kalman Filter (EKF). The Extended Kalman Filter provides the estimated extended...
This paper proposes a sensorless control strategy for the Interior Permanent Magnet Synchronous Motor (IPMSM) by using the parallel reduced-order Extended Kalman Filter (EKF). The sensorless control strategy is composed with two EKFs alternately computed every sampling period with a new model. The new model is based on the extended electromotive force (EEMF) which has a simple structure, making position...
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 proposes a speed sensorless vector control system for a permanent magnet synchronous motor (PMSM) by using a parallel reduced-order extended Kalman filter. The proposed scheme can save computation time greatly and estimate rotor speed and position by using new algorithms according to driving regions. To verify the merit of the proposed scheme, a comparison of a new reduced-order EKF algorithm...
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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