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 presents a technique to balance inductor currents of parallel-operated unipolar-PWM inverters. Firstly, the problem of unbalanced currents in parallel-operated unipolar-PWM inverters is defined and analyzed in the paper. Secondly, a technique to eliminate unbalanced currents is proposed. The proposed technique only requires one more current sensor in an inverter module rather than changing...
Further growth in renewable energy integration would be dependent on reliability and cost-effectiveness. These two factors can be achieved through power converter topologies that enable transformer-less connection of renewable energy based technology to the grid. This paper presents a three phase five level dual tapped inductor quasi impedance source (qZS)-nested neutral point clamped (NNPC) topology...
High performance power conversion equipment is currently gaining an increasing interest for aircraft applications. In particular, isolated bidirectional DC/DC converters are often proposed for modern HVDC aircraft distribution systems. For such reason an evaluation of several isolated DC/DC converter topology is carried out considering the proposed application, interfacing a 270V DC network with a...
This paper proposes possibilities of Y-connected three-leg topologies, that are built from combinations of two-level and three-level legs (hybrid structures). Therefore, four topologies are studied and compared in aspects such as harmonic distortion of output voltages and rating of power switches. Additionally, semiconductor losses comparisons in different scenarios of load (either high current or...
Z-source inverters (ZSIs), compared to the conventional two-stage architecture, embrace some interesting features, like the reduced size and complexity of the entire conversion system. Many research activities have been established to improve the performance of the so-called ZSI since it has been proposed in 2003, and several modifications have been introduced since then. These modifications include...
Owing to economic aspects, Central inverter is the dominating candidate in large scale PV installations despite its lower energy harvest compared to other topologies like string inverters especially under partial shading conditions. In this paper a new voltage balancing topology is introduced to enable better energy yield from central inverters. The proposed topology is characterized by its fractional...
An isolated high-voltage high-frequency pulsed power converter for non-thermal plasma ozone generation is proposed in this paper. With an input of 500 VDC, the output pulsed voltage can reach −12 kV through the inductor-capacitor resonance together with a step-up transformer. The pulse duration is designed as 1.66 μs. An anti-series connected switch pair at the input terminal enables the energy stored...
This paper proposes a single-phase AC converter with an active power decoupling circuit operated in DCM (discontinuous current mode) for PV (photovoltaic) systems. The proposed converter consists of an H-bridge single-phase AC converter and a boost converter, and a compensation circuit employed with a small capacitor for the power ripple. In many active power decoupling topologies that have been studied,...
This paper investigates two five-level reduced hybrid inverters with split-wound coupled inductor and reduced number of components. The proposed inverters are composed of two legs, one of two levels and another of three-levels. Two types of three-level leg have been investigated: diode-clamped and flying capacitor. When compared with more conventional topologies consisting of two three-level legs,...
Boundary conduction mode control is a convenient and low cost method for realizing power factor correction in boost and flyback converters. A signal proportional to the input sinusoid is used as a reference for shaping an inductor current. For a boost converter, this renders the input current to be sinusoidal, but it causes distortion in Flyback and buck derived converters. Mathematically, it can...
The paper presents a new bridgeless buck-boost PFC with the use of the Active Virtual Ground (AVG) technique which is called Manitoba Rectifier. The proposed topology can convert the grid AC voltage to a wide range of voltage output within a single stage circuit. By using the simple structure and the bridgeless technique, an efficient system is able to be guaranteed. In addition, the proposed topology...
The paper presents a new transformerless single-phase single-stage buck-boost grid-connected voltage source inverter (VSI) topology. The topology can achieve efficient power conversion with a wide input voltage range, number of magnetic devices reduction and low leakage current. The proposed VSI topology consists of high frequency semiconductors for shaping inductor currents, and low frequency semiconductors...
Improving the power density of a power converter has many benefits for systems integration. Aspects such as thermal management, weight, conformation to mounting locations, and the footprint of the converter all become critical factors as systems continue to scale down in size. The flying-capacitor multilevel (FCML) converter topology is of interest because it has characteristics which contribute to...
This paper presents a comparative study between a conventional boosted-VSI electric/hybrid electric vehicle (EV/HEV) powertrain converter with alternative topologies including bidirectional CSI, Silicon (Si)-based current-fed Quasi Z-Source Inverter (CF-qZSI), and Silicon Carbide (SiC)-based CF-qZSI. The higher switching frequency operation of SiC MOSFETs enables the size reduction of reactive elements...
Current source converter (CSC) is mainly applied in high medium voltage drives. To increase the system power region and reduce the output harmonics, parallel connection is an easy-implement and practical method. There are mainly two types of parallel based topologies. The direct parallel connect of two back-to-back CSCs is the first type, the two DC links can be controlled from the rectifier side...
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...
This paper investigates a multilevel inverter composed of series/parallel-connected H-bridges. The presented structure can be used for applications in which is intended to use semiconductor switches with low voltage and low current rating. A comprehensive system model to control the circulating current, an overall control strategy to adjust the output voltage with constant magnitude and frequency,...
The photovoltaic system works in stand-alone or grid applications, where the operation at the maximum power point (mPP) of generation is required. Maximum Power Point Tracking (MPPT) algorithm allows increasing the output power and it works commonly with a DC-DC converter. This work shows a novel analysis and the basic features of response about different topologies of DC-DC converters with MPPT algorithms...
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...
In recent years medium voltage direct-current (MVDC) grids have gained significant attention. This paper presents a new isolated modular multilevel converter (MMC)-based dc/dc converter for connecting such networks. The proposed converter can connect DC grids with different voltage levels and control power flow among them. The proposed isolated dc/dc converter has fewer components compared to conventional...
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.