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This paper presents an improved predictive current control (PCC) strategy for unbalanced stand-alone doubly-fed induction generator (DFIG) based wind power systems. The proposed control scheme predicts an appropriate average rotor voltage vector to eliminate the rotor current errors in the following switching period. The identified rotor voltage vector is then applied to the rotor-side converter (RSC)...
This paper presents a discrete-time predictive control strategy for a voltage-source inverter based on computation of a deadbeat control law and its approximating suboptimal voltage vector at every sampling interval. The controller, in addition to compensating for the inherent delay in the system, employs a simple prediction filter to suppress the disturbance caused by the back-EMF voltages and improve...
Distributed power systems are getting more attention now-a-days due to their high flexibility and reliability. In this paper, predictive current control strategy is proposed for the grid-connected four-leg inverters. This kind of converter is developed to deliver power to the unbalanced/nonlinear three-phase loads and as well to the grid. The discrete-time model of the converter and load is used to...
The large number of high power conversion applications has brought to the development of complex power converter configurations. A wide class of such converters are based on Power Electronic Building Block (PEBB) constituted of two level modules. Modulation strategies can take advantage of the modularity of these power converter topologies proposing modular and general control strategies. The present...
The interest in predictive control techniques and multiphase drives has re-emerged in the last decade, and predictive control techniques have been recently presented as a viable alternative to conventional PI and carrier-based or Space Vector PWM techniques in the current regulation of power converters and drives. Proposed schemes have demonstrated good performance at the expenses of a high computational...
This paper presents a predictive method of current control for grid connected three level neutral point clamped inverter in synchronous rotating frame. The predictive current controller calculates the inverter voltage required to force the load current to follow the reference. To validate the performance the computational time has been compared with DSP processor TMS320C240 and the maximum permissible...
Active NPC voltage source converters feature a higher degree of controllability than standard NPC converters due to the additional power switches which allows several different connections of the neutral point. In this paper, these switching redundancies are used to minimize and evenly distribute the energy losses. The predictive control scheme proposed is separated in two stages: The first one controls...
In consequence of the generic irregularity of wave energy, it is difficult to envisage the performance of a grid connected wave energy converter without simulations. This paper details a study on directly driven, linear, permanent magnet generator based, wave energy extraction scheme provided with grid-connected three phase neutral point-clamped three level inverter. The linear permanent magnet generator...
Model predictive control (MPC) techniques have been recently applied with success to the current control of voltage source inverters (VSIs). However, the dc-bus utilization and the overmodulation performance of the VSI using MPC techniques have not been explored and addressed yet. This work aims at filling this gap and shows for the first time the performance of a five-phase VSI both in linear and...
In this paper a direct predictive current control is proposed for a three-phase flying capacitor multilevel inverter. This control method has been applied to increase the bandwidth of the inverter, defined as the ratio between the switching frequency and the current injected frequency. The current control is applied without modulation, using pre-calculated sequence tables with pre-defined profiles...
Multilevel converters can reach medium-voltage operation, increasing the efficiency in high power applications. Among the existing multilevel converter topologies, modular multilevel converter provides the advantages of high modularity, availability and high power quality. Moreover, the main advantage compared to cascaded multilevel converters is the absence of input transformer; reducing the size,...
This paper presents implementation issues of a digital control system applied to a power factor correction (PFC) boost converter rated to a wide range of output power, operating in mixed conduction mode (MCM). The digital control system comprises an input current controller and an output voltage controller. The current controller is formed by two predictive model-based control laws, while the output...
This work proposes the application of model predictive control (MPC) to the control of five-phase voltage source inverters. The additional switching states and degrees of freedom present in multiphase inverters increase the number of calculations in the predictive control algorithm making difficult to implement optimization problem online. In this paper a method to reduce the calculations is proposed...
Digital predictive techniques are nowadays an attractive option for current-mode controlled voltage regulator modules. This article examines the implementation of two digital predictive control laws and their application in a typical case for this kind of loads. The simulation results presented in this paper illustrate the pros and contras of both techniques.
In this work, a predictive current control algorithm of an active filter built with multilevel diode clamped inverter is developed. Cycle by cycle current optimization is achieved through current prediction based on converter switching states and system parameters. The presented current control algorithm is naturally applicable to converters with an arbitrary number of levels with constant computational...
The losses of a voltage source inverter depend on the converter topology and the characteristics of semiconductor power switches, the control system, the inverter current control (modulation) algorithm and DC link voltage level. Significant component of overall losses are the switching losses of voltage source inverters (which are proportional to the switching frequency). Based on simulation results,...
In order to solve the stability problem caused by the parameter mismatch of filter inductance for a conventional predictive current control, a predictive current control method based on on-line parameter estimation of filter inductance is proposed in this paper. The average filter inductance value is calculated in each cycle of grid voltage by means of the average inductance model and phase-locked-loop...
A new complete RBF neural network SVPWM controller scheme for a grid-connected inverter is presented in this paper, RBF network architecture and the parameter is determined by using the clustering method, the RBF neural network which is simplifies and realize voltage space vector modulate to control the inverter. It was used in three-phase photovoltaic grid-connected inverse system which adopts control...
Predictive control has become a promising alternative to control power electronics devices, due to the continuous development of digital processing technologies. Predictive control methods exhibit high dynamic response being well suited to system that require tracking capabilities. In this paper a power factor correction rectifier, that requires a current control with a rectified sinusoidal reference,...
This paper addresses control techniques aimed at improving light-load efficiency and reducing harmonic distortion in digitally controlled single-phase boost power factor correction (PFC) rectifiers. Based on a discontinuous conduction mode (DCM) detection circuit, it is shown how an extension to the predictive current control law leads to improved current regulation over wide load range in both continuous...
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