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Aiming at the large instantaneous common-mode voltage in traditional space vector modulation strategy for two-stage matrix converter (TSMC), on the basis of analyzing the laws of common-mode voltage, an improved modulation strategy to reduce common-mode voltage was proposed. To suppress common-mode voltage effectively, the sector of rectifier stage was doubled into twelve sectors from six sectors,...
The Finite Control Set Model Predictive Control (FCS-MPC) technique is worldwide recognized due to its adaptability and capacity to take into account the discrete characteristics of control systems. However, it shows some limitations when directly used to control power converters, as its variable frequency spectrum, its limited current quality and its low-voltage precision for a given sample time...
The dual-inverter fed Open-End Winding Induction Motor drive offers interesting possibilities for multilevel inversion. It needs two isolated power supplies to feed individual inverters to avoid the flow of zero-sequence current. Three Space Vector PWM schemes have been reported in the earlier literature, which facilitate the operation of the dual-inverter drive with a single power supply. This paper...
This paper proposes three overmodulation schemes in the three-to-five phase indirect matrix converter. The first scheme uses only the adjacent large vectors to produce the reference output voltages. The second scheme improves on that by reducing vector elimination in the d2-q2 vector space based on the requirements of the output. The third scheme reduces the overmodulation requirements of the inverter...
A modified DC-link voltage balancing scheme for a three-level neutral point clamped inverter (NPC) with an interior permanent magnet machine (IPMSM) is presented. It uses two DC-link voltage sensors to take care of the voltage differences, and keep it to a required tolerance level. Switching control strategy is developed using a space-vector pulse width modulation (SV-PWM) scheme. Number of switching...
A promising solution to face the problems related to the integration of the Distributed Generation (DG) with a high renewable energy penetration level is to redesign the distribution grid using the concept of MicroGrids (MGs). Due to its constitutive components, production capacities, controllable loads and storage systems, a MG can contribute to the market either as load or production and its status...
This paper performs the control algorithm of three-level Neutral-point-clamped (3L-NPC) inverter system including the neutral point voltage balance control under unbalanced voltage conditions because the 3L-NPC inverter as compared with a conventional two-level inverter has an inherent problem of neutral point potential variation. The control of 3L-NPC inverter system under unbalanced input supply...
The major drawback of usual dual three-phase AC machines, when supplied by a Voltage Source Inverter (VSI), is the occurrence of extra harmonic currents which circulate in the stator windings causing additional losses and constraints on the power component. This paper compares dedicated Pulse Width Modulation (PWM) strategies used for controlling a dual three-phase Permanent Magnet Synchronous machine...
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...
The regenerative comparator circuit which lies at the heart of A/D conversion, slicer circuits, and memory sensing, is unstable, time-varying, nonlinear, and with multiple equilibria. That does not mean, as this paper shows, that it cannot be understood with simple equivalent circuits that reveal its dynamics completely, and enable it to be designed to specifications on static and dynamic offset and...
For high power applications, in which the discrete power switches are mounted on separate heatsinks, an overload of a semiconductor device leads to a local excessive thermal stress and eventually to a failure of the system. Despite of several control strategies that ensure the even distribution of losses in the normal operation, a local thermal overload can arise due to degradation of the cooling...
This paper proposes average inverter model operating in two complementary modes suitable for microgrid simulation applications. Three phase voltage source inverter (VSI) connects to the microgrid through an LCL low pass filter and operates either in current controlled (CC) or voltage controlled (VC) mode. Models presented here take into account the nonlinear behavior of the switches, delays in the...
The paper presents a new current sharing control scheme for parallel connected three phase converters. The proposed method, based on the representation of the three phase converter currents by the magnitude of the current space vector, is shown to obtain good current distribution with minimum shared information between the parallel connected converters. Converter output voltage magnitudes are modified...
For direct model predictive control schemes with current reference tracking, the underlying integer least-squares (ILS) problem is reformulated to reduce the computational complexity of the solution stage. This is achieved by exploiting the geometry of the ILS problem and by reducing the computations needed for its formulation and solution. A lattice reduction and a sphere decoding algorithm are implemented...
Using one DC source for the dual inverter open-end winding topology can lead to common-mode current circulating through the DC bus connections and, to prevent motor failure, arising of EMI issue and increasing losses in the system this should be avoided. Such common-mode current flow results if there is a common-mode voltage (CMV). Therefore, in this paper, a switching scheme for the dual inverter...
A modified DC-link voltage balancing scheme is proposed, which keeps the two DC-link capacitor voltage differences at a desired level for wider load variation and for low power factor. Moreover, the proposed control strategy uses a reduced number of switching sequences compared to conventional DC-link voltage balancing strategy, which helps to reduce the switching losses. Effects of low power factor...
This paper introduces a novel PWM technique to eliminate common mode voltage (CMV) in multilevel inverters using the three zero common mode vectors. Similarly, as in conventional PWM for multilevel inverters, this PWM can be properly depicted in an active two-level voltage inverter. With the help of two standardized PWM patterns, the characteristics of the PWM process, as a switching time diagram...
This paper presents a current-source converter (CSC) that uses a switched-inductor dc link circuit to improve its performance characteristics, providing opportunities to lower the conduction losses in the rectifier stage and dc link, as well as an additional degree of freedom for regulating the output current waveforms. The proposed topology replaces a single link inductor in the self-commutated CSC...
In this paper, an asymmetrical ΓZ-source hybrid power converter is proposed for fuel cell-battery hybrid vehicle application. The converter uses an asymmetrical ΓZ-source converter to interface the fuel cell and a bidirectional DC-DC converter to interface the battery. Via the DC-DC converter, the capacitor voltage of the asymmetrical ΓZ-source converter can be controlled into a constant value. By...
Due to the high installation and operation cost of UPFC and the discrete compensation voltage of ST, this paper focuses on the development of a novel topology of IST which is consisting of a high-capacity ST and a small capacity UPFC. Digital simulation model of the IST including a steady-state performance and a transient response model has been developed in the MATLAB/SIMULINK software package. The...
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