The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper is concerned with the process of current commutation and overvoltage protection in matrix converters. The mechanisms involved in the commutation process and clamp circuit are described and simulation waveforms are presented. A four-step semi-soft commutation strategy is described that this technique relies on knowledge of the output current direction and the ability to control the direction...
Due to the three-phase-to-three-leg direct matrix converter (3 × 3 MC) cannot be achieved with unbalanced load, then the three-phase-to-four-leg direct matrix converter (3 × 4 MC) is introduced. A novel modulation strategy is proposed to ensure the capability of 3 × 4 MC with arbitrary loads, which is development by using fixed voltage vectors and one zero vector. Considering the harm of common-mode...
An HVDC system based on a Cockcroft-Walton (CW-HVDC) topology is presented and a novel strategy is proposed to analyze and control the converter. In the connection to the grid the CW-HVDC uses a 3×2 matrix converter. The CW-HVDC voltage state-space vectors are derived and used to control the AC currents, guaranteeing nearly unitary power factor in the connection to the grid. Sliding mode controllers...
The matrix converters are a promising solution in the industrial domain applications, a compact size with high performances and large scale control capability with high quality energy. The integration of MPC (model reductive control) theory based on finite number of control input into drivers led to the development of innovative technique to improve the control optimality. Through this paper, an indirect...
This work proposes a DTC-SVM control algorithm based on Stator coordinate transformation to control an induction machine fed by a three level Neutral point clamped matrix converter. The algorithm is simulated on Matlab Simulink to verify its performance. It gives good performance in general. The results are discussed and a study of the effect of the variation of stator resistance is proposed also.
With increasing levels of distributed generation systems connecting into the electrical grid, power electronics converters are widely applied to interface these systems to the grid and to provide various control functionalities. This paper presents a novel matrix converter topology with adapted control strategies for energy conversion in distributed energy systems. This topology with the associated...
The trend in wind turbines has shown an ongoing power rating growth, reaching sizes up to 10 MW. Multilevel converters have therefore become a favourable solution for Multi-MW Wind Energy Conversion Systems (WECSs), due to high efficiency, reliability, controllability and the ability to reach high power/voltage ratings. Moreover, stringent grid codes to regulate the connection of WECSs to the electrical...
This paper presents a generalised control that can be applied to a class of modular multilevel converter topologies. The approach splits up into current control based on the state-space representation and branch energy balancing. For the branch energy balancing, an optimisation process leading to minimal additional current stress is presented. After describing the control approach independently from...
This paper presents an overview of the predictive control principles applied to matrix converters and also the different topologies where this control technique is applied. It will be shown that the predictive strategy is a promising alternative to control matrix converters due to its simplicity and flexibility to include additional aspects in the control being suitable for different industrial applications.
The predictive strategy is a promising alternative to control matrix converters and due to its simplicity and flexibility to include additional aspects in the control, its implementation can be extended to different topologies and industrial applications. This paper presents an overview of the predictive control principles applied to matrix converters and other derived topologies including cascade...
In this paper a comprehensive overview of multilevel matrix converter topologies is proposed nowadays as an alternative to the traditional AC/DC/AC multilevel converters. The operation principle and characteristics of the neutral-point clamped and cascaded H-bridge multilevel matrix converters are explained in detail. Simulation results of three-level NPC sparse matrix converter are presented to study...
In this work, we propose to analyze and implement a two-stage switched-capacitor dc-dc converter design. The proposed converter topology comprises a half-step-down converter, modeled by average state-space approach and associated with the traditional Buck converter to obtain a large-voltage-gain, eliminating the high-frequency transformer, hence reducing its dimensions, making it compact and lightweight...
This paper presents an alternative approach for analysing and controlling the Modular Multilevel Matrix Converter. After a system description, the proposed current control and branch energy balancing methods are introduced. As distinguished from previous approaches, the presented method is more general and easier applicable to other modular topologies. Its functionality is verified by simulation and...
This paper proposes a new topology for a three-phase AC/AC converter without DC. The presented topology is based on an direct AC/AC ĆukB2 bipolar matrix-reactance chopper. The considered solution is intended to control power flow and compensate voltage perturbations in the modern AC power grid with active loads (two-source system). The main difference in the proposed solution in comparison to a conventional...
Modular Multilevel Converters have a large number of advantages at high voltage and power levels. Due to their modular structure, they offer easy scalability, high quality output waveforms, and superior availability, to name a few. This paper aims at further increasing the availability of the Modular Multilevel Matrix Converter. A new method allows to operate the converter even in the case that a...
This paper presents a novel seven-phase open-end winding drive system supplied by the dual non-square matrix converter. The input to each of the matrix converter is three phase utility grid system and the output is seven phase voltages with variable voltage and frequency. The two matrix converters feeding a seven-phase load are supplied from a common single three-phase utility source of 50 Hz. Space...
The matrix converter (MC) is direct AC-AC power converter without an intermediate DC link which can offer a number of advantages, including unity input power factor, bidirectional power flow, an improved input current harmonic issue, capable of compact design and high power density without energy storage elements. Above advantages make the matrix converter suitable for aircraft, AC power supply unit...
A novel medium-frequency-transformer isolated matrix converter topology for wind energy conversion applications is proposed in this paper. The proposed topology consists of single-phase cascaded AC-AC converters on the utility side and three-phase matrix converters on the PMSG side, with medium frequency transformers as isolation. No DC-link capacitors or resonant L-C circuits is needed thus increases...
The matrix converter (MC) is an array of controlled bidirectional semi-conductor switches that allows direct ac-ac conversion without an intermediate dc link. To extend its future application, multilevel matrix converter can be a proposed solution due to its merits in multilevel output, high voltage application, high power conversion, improved harmonics issue and less voltage step, etc. This paper...
Due to the high energy consumption in data and telco centers, the use of 380V or 400V DC facility-level distribution has been proposed as an alternative to the conventional AC distribution for a more efficient power delivery structure. The DC voltage is powered from the three-phase mains by a PFC rectifier and in many cases a mains transformer is used to provide galvanic isolation. In order to achieve...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.