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This paper analyzes the operation of AC machines at high speeds under voltage constraints. Two major issues are addressed: current regulator design and saturation techniques. Methods able to provide maximum dc bus utilization through the proper use of saturation techniques, good dynamic response and reduced sensitivity, will be proposed.
This paper presents a three-level neutral point clamped voltage source inverter with hysteresis voltage control. Output characteristics of the converter and voltage control for a voltage source inverter are described. A simulation model of a three-level neutral point clamped inverter with a control system based on the hysteresis voltage control was developed. Basic diagrams that demonstrate performance...
A current sharing method considering battery state of charge(SOC) for multi-module uninterruptable power supply(UPS) system is proposed. Modularized UPS system consists of a single master module and multi slave modules. A master module performs output voltage control and distributes current commands to slave modules. The current commands are generated by using the proposed current sharing algorithm...
This paper proposes a new hysteresis based predictive current control of neutral clamped inverter for DSTATCOM application. This method uses a possible voltage vector to predict future injected compensator current and minimum quality functions selected. The control directly provides compensator currents from the predicted values once the zero error is verified. The performance of proposed current...
As the power demand increases rapidly in the electricity market the use of renewable energy sources also increasing. Renewable sources are significantly different from the traditional power sources due to their stochastic nature. Therefore it is a tough task to integrate renewable energy sources with the existing utility grid. In order to ensure the grid reliability, current controlled Pulse Width...
This paper proposes a predictive control technique for an indirect matrix converter. The proposed control strategy gives sinusoidal waveforms at both the input and output of the converter without any weighting factor in the cost function and, at the same time, giving operation at a fixed switching frequency. Simulation results with an unbalanced ac-supply validate the proposed method under both steady...
In this paper, a current controller for an inverter connected to the grid through an LCL filter is proposed. Unlike classical active damping schemes, it is proposed to implement the controller by measuring the injected current only. It can be done irrespectively of the filter resonance frequency. In addition, it is possible to place the closed-loop poles of the system in an arbitrary way. The controller...
This paper presents a direct model predictive current control of quasi-Z-source inverter (qZSI) compared with the traditional PI control based on PWM technique. The comparison is done in terms of the tracking ability throughout the transient and the steady-state operation, the required switching frequency, and the Total Harmonic Distortion (THD%) values. Experiment results are presented verifying...
Analytical design and adaptation of voltage regulation loop for flux-weakening control of Interior Permanent Magnet Synchronous Motor drives are addressed in this paper. Theoretical analysis of the overall dynamics of the loop has been carried out in recent papers, also taking into account non-linear effects and discrete-time implementation issues. A proper gain adaptation technique was proposed to...
Predictive current control (PCC) methods have been widely implemented for grid-connected voltage source inverters (VSIs) recently to achieve better output performance, however, facing the challenge of high sensitivity to uncertain system disturbances and inevitable time delay. In this paper, a new PCC scheme has been proposed for a single-phase VSI to improve the quality of the current fed to the...
The combination of deadbeat controller and open-end winding topology is effective for improving the response of current control of induction motor drive system. A deadbeat current controller achieves high gain by compensating the delay element of digital controller with current prediction and excluding it from the control loop. The response of a deadbeat current controller depends on the duration...
In this paper, a generalized predictive current control method based on two vector utilization in one sampling period are proposed for regulating load currents of three-phase voltage source inverters (VSIs) with small current errors and current ripples. In the proposed method, selecting two future voltage vectors and partitioning them in a future sampling period are determined by an optimization process,...
The development of distributed generation (DG) systems has led to the increasing use of voltage source inverters. However, step-changes in the modulated voltage can produce dangerous peak common-mode currents (CMCs), which can interfere with the power system ground and cause detrimental effects on other equipment. In this paper, the root cause of CMCs is explored and analyzed. After this, a new method...
This paper proposes a novel method to control the current of a three-leg voltage source inverter (VSI) supplying a two-phase induction motor (TPIM) in the stationary frame by modulating the potential of neutral leg middle point with a proposed algorithm and using two closed loops with optimized proportional and resonant (PR) controllers to regulate the current. Two conventional current control strategies...
Parabolic current control is an attractive current control method with fast transient response and constant switching frequency. Due to the good dynamics of parabolic current control, it can be employed in voltage source inverters to improve the system performance such as minimizing the distortion of current waveforms or voltage waveforms. To implement parabolic current control, a current sensor is...
This paper proposes a testing method for the evaluation of the inverter dead-time voltage error and the related compensation schemes using a hardware-in-the loop converter topology. The inverter under test is operated as a voltage source that is connected with another twin inverter acting as a virtual load. The virtual load is operated as a current-controlled voltage source converter that draws specified...
Grid connected Electric vehicles (EVs) and Plugin hybrid electric vehicles (PHEVs) can benefit the grid by utilizing Vehicle-to-grid (V2G) technology. V2G enables stored electrical energy in electric vehicle batteries to be returned to the grid for peak demand and other ancillary services. Typically, the onboard electric vehicle battery charger is uni-directional but needs to be bi-directional to...
This paper proposes a variable sampling frequency model predictive control (VSF-MPC) to achieve fixed-switching frequency operation for a neutral-point clamped (NPC) inverter. The proposed control technique simultaneously considers load current control, balancing of DC-link capacitor voltages, mitigation of common-mode voltage, and elimination of even-order and inter-harmonics in the load current...
This paper presents a predictive current control strategy with active damping method applied to a current source inverter. This control strategy uses a discrete-time model of the system to predict the future value of the grid current for all possible current vectors generated by the inverter. According to a cost function that minimizes the errors of the predicted grid current and the reference grid...
A space-vector hysteresis modulation (SVHM) technique is presented in this paper for three-level neutral-point-clamped (TL-NPC) multilevel inverter for active power filter (APF) applications. The main responsibility of this modulation technique is to force the actual current to reach the reference current and, simultaneously, balance the capacitor voltages. This scheme is implemented in the stationary...
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