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This paper presents a sliding mode control for a three-phase grid-connected voltage source inverter with vector operation. The design of closed-loop system is based on the sliding-mode theory, and it is carried out with the help of a converter large-signal dynamic model. The closed-loop system improves the transient response and minimizes the steady-state error. Essentially, the contribution of this...
In this study, a new method is proposed for the suppression of voltage amplitude fluctuations on the load terminals. Moreover, the voltage harmonics on the load terminals are effectively reduced below the defined limits in the IEEE-519 standard. In the studied topology, a twelve-switch three-phase voltage source converter is used for effective control on the zero-sequence components due to the unbalanced...
In this paper, two approaches based on sliding mode control for controlling a single-stage grid-connected three-phase solar photovoltaic system have been presented. The sliding mode control is robust and has good disturbance rejection as compared to the conventional proportional-integral control. Another advantage is that feedback linearization is not required for controlling nonlinear systems. There...
This paper proposes a multi-loop controller for current control of a grid-connected inverter with an LCL-filter. The inner loop uses the converter current error as the sliding surface in a Sliding Mode Control (SMC) approach. The model obtained allows the application of an outer Model Reference Adaptive Control (MRAC) for the tracking of the grid current in a robust fashion with disturbance rejection...
This paper presents a current control method applied to permanent magnet synchronous motors using sliding mode controller and disturbance observer. The current control is carried out at dq synchronous reference frame. The proofs of stability are developed from the Lyapunov analysis requirements. A sliding mode rotor speed observer is combined with the proposed current control scheme. Simulations results...
This paper proposes an adaptive full-order Sliding Mode Observer (SMO) for the rotor speed and position estimation in the Permanent Magnet Synchronous Generator (PMSG). A full-order terminal SMO is designed to make the estimated stator current track the actual stator current, and eliminate the chattering. Furthermore, A back Electro Motive Force (EMF) observer adopts adaptive control to estimate the...
In this paper, a robust nonlinear control approach based on a simplified control-oriented model of an engine cooling system for vehicles is presented. An electrically driven radiator fan is considered as a control input. Based on the system description, a second-order sliding mode control is proposed to track desired trajectories of the engine outlet temperature. The second-order sliding mode control...
This paper presents a discrete time torque observer and an extended H∞ filter to estimate the rotor speed and position in a permanent magnet machine. Those estimated variables are key components of a robust sensorless controller for the machine when it is associated with a wind turbine emulator test-rig. In addition, an iterative maximum power point tracking algorithm is proposed for maximum efficiency...
An adaptive nonsingular terminal sliding mode (NTSM) tracking control scheme based on backstepping design is presented for Micro-Electro-Mechanical Systems (MEMS) vibratory gyroscopes in this paper. The nonsingular terminal sliding mode controller is designed based on backstepping strategy to eliminate the singularity, while ensuring the control system to reach the sliding surface and converge to...
The drive performance of permanent magnet synchronous motor (PMSM) can be deteriorated due to various disturbances. In this paper, the problem of speed control for a PMSM system with parameter uncertainties is investigated. A new control algorithm based on nonsingular terminal sliding mode control (NTSMC) is proposed, where the controller is developed for speed regulation. Compared with conventional...
In this paper a simple sliding mode controller based on the averaging state space model is proposed for a DC-DC boost converter. It is demonstrated to be easily implemented and has time-variant sliding coefficients. The proposed controller can effectively regulate the output voltage by controlling the switch states (through the dynamic duty cycles) even when the input voltage, load or output command...
This paper presents a novel terminal sliding mode (TSM) control scheme with double closed-loop structure of capacitor voltage and inductance current for the stability control of DC-DC buck converter. In order to satisfy the different performance demands of capacitor voltage and inductance current, a TSM controller and a linear sliding mode (LSM) controller is designed separately. For the former, TSM...
This paper presents an active damping method in natural frame for a three-phase voltage source inverter with LCL filter. The proposed method is based on the pole placement technique via Ackermann's formula. This approach is used to obtain the proper sliding surface vector coefficients to emulate a virtual resistor in series with the capacitor filter. Besides a well-known method in the literature have...
This paper presents an improved direct power control (DPC) strategy based on sliding mode control (SMC) with dual-closed-loop for the Vienna-type rectifiers to improve dynamic response during both start-up and load step change periods and guarantee better performances in steady state. The SMC based DPC methodology can directly regulate the instantaneous active and reactive powers without transforming...
Transformerless inverters are widely used in grid-tied photovoltaic (PV) generation systems, due to the benefits of achieving high efficiency and low cost. The transformerless photovoltaic inverter may generate a leakage current between the inverter and the grid, through a parasitic capacitance. This leakage current will cause a low efficiency a distortion of the output and should the staff be in...
Active power filters have been used to eliminate current harmonics generated by nonlinear loads, because such loads decrease the power quality, but with the growing use of renewable energy sources interconnected to the grid is possible integrate the function of the active power Alter to the grid-connected photovoltaic-system, the functions in a single device. Due to the before mentioned the use of...
The chattering phenomenon associated with the use of Sliding Mode Controllers (SMC) is considered a major drawback of the robust controllers. Ideally, SMCs are to exhibit infinite switching frequency but this is always compromised by the existence of parasitic dynamics which add to the input relative degree of the system and leads to high but finite switching frequency. The performance and robustness...
This paper presents an improved variable hysteresis-band current-control in natural frame for a three-phase shunt active power filter. The proposed control algorithm is based on three decoupled sliding-mode controllers combined with three independent Kalman filters. The use of Kalman filters instead of a non-adaptive state observer improves the quality of the estimated signals in presence of noise,...
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