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.
The modular multi-level converter is an upcoming topology for drive application in the megawatt power range. This paper presents a comprehensive reliability survey for this kind of converter which can be used for its optimal designing. In this survey, converter total failure rate, is calculated for different number of output levels to find the optimal condition in which converter can provide the best...
Differential power processing (DPP) module integrated converters are developed to mitigate the effects of the mismatch losses in series connected photovoltaic (PV) strings. This paper focuses on the configurations used in various DPP converter topologies by categorizing them into two main classifications: 1) Maximum power point tracking configurations and 2) voltage balancing configurations. The implementation...
High-voltage and high-current power converters are essential in numerous applications, including shipboard power systems and industrial motor drives. Most of the existing topologies are based on dc-link converters, and use dc-dc or dc-ac power cells to realize a multilevel power converter. Therefore, they require a large number of capacitors with high capacitances. This paper proposes a new modular...
In this paper, a new class of bidirectional universal power converters is presented. As a universal power converter, the proposed converter can interface any type of source and load without any limitation in their forms (ac or dc) and number of phases. In this converter, which accomplishes power conversion in a single stage, a small inductor placed in series with the input and output switch-bridges...
This paper introduces a 97% efficiency medium voltage (MV) Solid State Transformer (SST) based on two-level single stage (TLSS) topology and 15 kV SiC MOSFETs. Series resonant converter (SRC) is implemented as the main stage and is identified as a current source (CS) SRC for the first time. Equivalent resonant frequency of the proposed CS-SRC is analyzed in both time domain and frequency domain. Resonant...
With reliability and flexibility criteria surging, multi-level converters become of growing interest for high-power medium-voltage renewable energy applications. Specific objectives are met with specialized intelligent controls. The goal of this paper is to present a universal intelligent controller able to manage all degrees of freedom of multi-level power converters and any paradigm. To do so, a...
As days go, renewable energy resources getting lot of consideration due to the growing demand of energy. In view of all the renewable energy resources, solar energy is very prominent because sunlight is obtainable all over the year. This research work concentrates on performance and reliability enhancement of grid-connected Solar Photo Voltaic (SPV) power conversion system with a prominent implementation...
An internal paralleled active neutral point clamped converter (IP-ANPC) is presented in this paper. Advantages of the IP-ANPC converter include modularity, reliability and efficiency improvement, capability of interleaving, and better utilization of wide band-gap (WBG) devices. To simplify the operation of the IP-ANPC converter and provide an easy interleaving solution, a logic-based flying capacitor...
The integration of Battery Energy Storage Systems (BESS) into the power grids has been proposed as an effective solution for mitigating voltage and frequency instability problems arising from the integration of renewable resources with intermittent patterns. One of the most important applications of BESS is to restore an electric power system to operation without counting on the external transmission...
The bulky electrolytic capacitors that are typically used at the dc-bus of back-to-back topologies limit the reliability of the system and their elimination can benefit the reliability and operational life of a power electronics converter. This paper presents the interconnection of two ac systems through a dc-bus capacitor-less back-to-back converter topology. The back-to-back topology consists of...
In this paper, a new power electronics interface topology for Direct Drive Wind Turbines (DDWTs) to improve the system reliability and with a potential to decrease the size of the Permanent Magnet (PM) generator is presented. In the proposed topology the grid-side Voltage Source Converter in a traditional DDWT is replaced by a three-phase single-stage boost inverter. This enables the use of a low-voltage...
Advancements in power-electronic devices as well as the transition to new electrical power sources make the application of multiterminal medium voltage DC grids feasible. In order to selectively interrupt fault currents, DC circuitbreakers might be required for a safe grid operation. Since different DC breaking concepts for low, medium and highvoltage are available, this paper compares several concepts...
The concept of HVDC taps drawing small amount of power from HVDC lines to the rural places has been considered for several decades. Most of the earlier tap converters were limited by its loss, cost, reliability, and control difficulties. However, in this paper, the emerging modular multilevel converter (MMC) is adopted as the series HVDC tap, which reveals significantly improved performance and feasibility...
In the transformerless grid connected photovoltaic system, the inverter is the main component. In order to improve the efficiency of the inversion system and achieve a low level of leakage current, several topologies have been applied, among which three level NPC inverter is a kind of popular application. Because the three level NPC inverter has the advantages of low switching losses, good common...
Many efforts have been made to improve the single-phase power converters with active capacitive DC-link. The purpose is to reduce the overall DC-link energy storage and to achieve a reliable and cost-effective capacitive DC-link solution. A few review papers have already discussed the existing capacitive DC-link solutions, but important aspects of the topology assessment, such as the total energy...
The focus of this paper is to develop a framework to evaluate and analyze the reliability of the power electronic circuits in electric vehicle chargers, which are expected to be a major component of the utility load in the future. A general infrastructure of electric vehicle charging systems is described and different charging levels are discussed. To illustrate a numerical reliability analysis, two...
Bulk electrolytic capacitors are used in single phase inverters to reduce the ripple in dc link voltage which is due to the pulsating nature of the instantaneous power. The reliability of an inverter is limited by the lower lifetime of these capacitors. In addition, the switching devices also deteriorate the reliability, due to their significant failure rate. In order to improve the overall reliability...
This paper investigates the reliability of different topologies of grid connected photovoltaic (PV) systems. The topologies considered in this study are centralized topology, string topology and multi-string topology. The reliability of each topology is evaluated by using suitable reliability indices that are based on calculating the probability of different operating states. These states are evaluated...
DC distribution network will be widely used in the future with more integration of distributed generation. However, development of DC distribution is hindered by lack of appropriate circuit protection technologies. Certain protection schemes are studied in this paper, and used to detect and isolate the fault on the distribution lines and bus-tie line. The instantaneous overcurrent protection and the...
Dual inverter open winding drive (DIOWD) has several advantages over standard 3 phase drive such as multilevel voltage output, lower dc link voltage, high efficiency and better fault tolerant capability. In this paper three DIOWD topologies aiming for high speed and/or safety critical applications are evaluated. Their operation characteristics, VA ratings, efficiencies, harmonic distortion factors...
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.