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This paper proposes the novel tuning method for PI controller parameters for three-phase voltage source inverter (VSI) which imparts robust stability and optimized performance to the system. Resonated output filter is actively damped using filter capacitor current current feedback. Selective damping technique is proposed to exclusively target the low frequency harmonics within bandwidth. From a set...
The design of the voltage loop and current loop of three-phase high power factor PWM rectifier was introduced, the strategy of dual-mode control that combine fuzzy control to PI regulator is proposed, which use fuzzy controller to obtain quick dynamic response when deviation is in small range and adopt PI regulator to realize no static error when deviation is in long range, improving the control accuracy...
A two stages robust Generalized PI feedback controller for a single-phase active multilevel rectifier is proposed. The controller is based on the system modeled in the d-q synchronous reference frame. Based on input-output linearization theory a current controller that decouples the d-q components and compensates unknown perturbations is obtained. Performing a transformation of the system, stability...
A control scheme constituted by a nonlinear state feedback current controller and a PI voltage controller for a single-phase active multilevel rectifier is designed. The control is based on the system modeled in the d-q synchronous reference frame. Through input-output linearization theory a current controller that decouples the d-q components is obtained. Stability of zero dynamics is verified. Due...
A tension adaptive variable-structure control system was designed for constant tension of electric cable plastic wrapping automatic production process. This system contains two inner loops for current and velocity control using PI regulators; its outer loop is for tension control using model reference adaptive controller. Simulation results indicate that the adaptive variable-structure controller...
In a previous paper the authors proved that a large class of switched power converters can be globally asymptotically stabilized with a simple linear proportional-integral (PI) controller around a suitably defined output. An explicit formula to construct the desired output, which is a linear combination of the converter states, is also given. Moreover, if the load resistance is unknown, an adaptation...
Self oscillating control of LCC current-output resonant converter is presented based on varying the phase angle between the fundamental of the input voltage and current. Unlike other commonly employed control methodologies, the proposed technique is shown to provide a convenient, linear system input-output characteristic suitable for the design of regulators. The method is shown to have a similar...
The goal of this paper is to present the advantages of robust control in comparison with classic control techniques. Pulse amplitude modulation induction heating inverter with series resonant load circuit with uncertainties is presented for heating nonferrous metals. Inverters performance with robust and PI control will be compared.
In this paper, a robust control system is proposed for controlling the input DC voltage and the output AC voltage and frequency of the load-side converters in stand-alone wind energy systems. The proposed controller consists of voltage regulators based on a PI-like fuzzy technique and a current-mode controlled boost converter. The proposed controller is tested on several operation and fault conditions...
Robust adaptive control techniques have always been used in numerous industrial applications. In this paper, the dead-zone technique is used to damp growing oscillations in flexible AC transmission systems (FACTS) which is regarded as a new control mechanism for FACTS. The developed controller will overcome the arising problems due to the uncertainty of system parameters and disturbances acting on...
This paper presents an advanced voltage control method for voltage-controlled current source inverter(VC-CSI) with nonlinear loads. The proposed technique adopts the proportional sinusoidal signal integrator (PSSI) controller to achieve a rather good voltage tracking ability under nonlinear load conditions, which can be implemented directly in the stationary alphabeta frame with no need of the rotating...
This paper presents a novel fuzzy logic controller (FLC) for three-phase PWM Rectifier. The fuzzy logic controller is employed in the outer voltage loop. In order to improve the performances of current loop, the antiwindup PI controller of inner current controller is used instead of the traditional PI controller. The complete control scheme of the three-phase PWM Rectifier is implemented in real time...
The purpose of this research is to optimize control and enhance performance for a variable speed constant frequency (VSCF) doubly-fed induction generator (DFIG) wind turbine generation system by using fuzzy logic controller. The control of the rotor-side converter is realized by stator flux oriented control and the fuzzy controller performs robust speed control. The control of the grid-side converter...
Matrix converter (MC) is superior to drive induction motor since it has more attractive advantages than conventional pulse width modulation (PWM) inverter like the absence of large dc-link capacitor, unity input power factor and bi-directional power flow. However, due to the direct conversion characteristic of MC, the drive performance of induction motor is easy to be influenced by input voltage disturbances...
A nonlinear mathematical model of three-phase voltage source PWM rectifier is established in the dq rotating frame. Aiming at the poor dynamic performance of conventional PI controlled three-phase PWM rectifier, a control system with double close-loops of voltage and current is designed based on the mathematical model of 3-phase PWM rectifier. A sliding-mode control algorithm on synchronous rotating...
The traditional control strategy of active power filter (APF) has low accuracy and bad robustness. Firstly, a state-space model of shunt APF is established. Taking errors as unknown disturbance to the system, a robustness controller is designed based on the Hinfin control theory. Secondly, the fuzzy PI control with self-adjustable factor is applied in the DC-link voltage control of APF. The self-adjustable...
Adaptive control theory has been recently used in damping the growing oscillations in power systems, enhancing the system response and improving system dynamic stability. This paper proposes a new robust adaptive control mechanism for FACTS. The adopted concept is the dead-zone modification based on model reference adaptive control (MRAC) technique. The developed controller aims to overcome the variation...
This paper deals with shunt active power filtering for power quality improvement under unfavourable non-linear load and source conditions. A simple hybrid control strategy is used, based on a numerical integrator proportional (IP) DC bus controller combined with a phase-locked loop (P.L.L.) output to generate reference currents. A second analogue current controller is developed to insure- three phase...
Auxiliary power supplies for traction rolling stock are used to power the carriage service facilities and control systems that are essential to keep a train operational. The design of converters for such applications is quite challenging, since the traction environment requires high performance systems that can manage a range of harsh environmental and electrical requirements without compromising...
This paper presents an optimal PI controller for automatic reactive power regulators (AQR) which equip some French hydro power plants. The developed AQR algorithm participates to secondary voltage control following some control performance criteria required by the Transmission System Operator. Controller parameters are calculated by solving a constrained nonlinear optimization that maximizes the robustness...
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