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A dual strong-arm (DSA) comparator is designed targeting at low-voltage operation in deeply-scaled technologies. The addition of a second regenerative latch helps reduce both offset sensitivity and offset while maintaining comparable or better performance as a conventional double-tail latch across a wide range of voltages. A large comparator offset measurement array is fabricated in a 28nm FDSOI process...
The ease of expansion of power system and lowered cost made the use of modular converters in Renewable Energy System more common. Different configurations are implemented depending on the applications. Control strategies like fuzzy logic, droop method and charge control scheme are developed for achieving sharing of current and voltages among the converters. In this paper new modularization architecture...
Renewable energy resources are connected to power grid through voltage source inverters. In these systems, the electric current entering into the grid is supposed to fulfill the IEEE criteria, so that high quality of power with less distortion is transported. Due to this, low pass filters like L, LC or LCL are applied by means of the inverter to minimize the harmonics getting into the grid. LCL filters...
The wireless sensor node makes use of energy harvesters in order to power its modules. However, by nature of these nodes being placed in diverse locations and fluctuating conditions, their energy harvesters obtain unregulated DC voltage. Regulators undertake this problem by appropriately handling the voltage being harvested to power the node. Most regulators today use analog control methods which...
In this paper, implementation of a virtual resistance controller for DC-DC boost converter Dahono 1 to improve the damping during transient response is proposed. The virtual resistance is developed by using pole placement and root locus techniques to obtain the desired transient response for the converter. The model that considering component non-idealities then established. In order to verify the...
The paper presents a new four-level voltage source converter (VSC). Compared to conventional four-level converters, this proposed converter has fewer components and can be used for a higher power density system in low and medium voltage applications. Its principles and advantages are studied in this paper. The effect of various redundant switching states on the voltages of flying capacitors is analyzed...
Modular Multilevel Converter (MMC) has great application prospects for the flexible HVDC transmission, high-power motor drive and so on. In this paper, a discrete-time model of the MMC based on the virtual ergodic method is proposed for the typical MMC topology. First, the MMC topology is analyzed and its continuous-time model is established. Then, the state equation in the continuous-time model is...
Modular multilevel converter (MMC) is a promising topology of Voltage Source Converter based High voltage Direct Current (VSC-HVDC) system with many outstanding advantages such as low switching frequency, low voltage distortion and harmonics. Pre-charge process is one of the core issues of MMC based system, especially for the MMC with DC fault blocking capability. In this paper, considering a novel...
The multilevel converter is a prospective topology for both Medium Voltage and High Voltage Direct Current (HVDC) applications. In high power application, the forward topology is applied to increase the power region. In this paper, a novel forward-mode five-level inverter is presented which combines the features of the conventional multilevel converters and forward topology. The converters can transfer...
With the continuous development of high frequency inverter technology and multilevel inverter technology, all kinds of novel high frequency multilevel inverter are put forward and studied. And among them, the interleaved flyback three-level inverter (IFTLI) has a better work performance. In this paper, the control methods of single-phase IFTLI will be studied in-depth. Firstly, the instantaneous voltage...
Cascaded multilevel inverter (MLI) topologies have received an attractive solution for grid connected PV system. In this paper, two-cascaded MLI topologies are presented for grid connected PV system. These are seven level cascaded H-bridge multilevel inverter and three phase cascaded voltage source multilevel inverter. In both presented MLI configurations, each PV module is connected to one DC-DC...
Tow-stage configurations used in photovoltaic (PV) architectures (microinverter, string inverter or multistring inverter), are commonly used because of the advantages in front of mismatch conditions. In case of a partial shading scenario (produced by cloudy days and dust accumulation), two-stage architectures reach higher efficiencies compared with the traditional central inverter. It is because,...
This paper proposes a frequency observer based control of a solar energy conversion system (SECS). The proposed control eliminates the DC offset and harmonics current and provides fundamental component of load current. The mathematical analysis of the control is corroborated and discussed in terms of filtering capabilities. Besides, capability of maximum power extraction, it integrates maximum extracted...
The paper proposes a three phase nine level T-type neutral point clamped (9L-T-NPC) inverter for medium voltage induction motor drive. The primary objective of the proposed inverter is to improve the output voltage quality with reduced number of devices and passive components. The generation of nine levels in the output pole voltage is achieved using only ten switches per phase. Although the similar...
Performance analysis and output voltage regulation of a cascaded step-up switched-capacitor converter (SCC) under zero voltage switching (ZVS) condition is analyzed in this paper. The ZVS condition (converter operation above its resonant frequency) provides 1) zero-voltage switching, which leads to a relatively higher efficiency compared to zero current switching (ZCS) under the resonant frequency...
With the increasing penetration of renewable energy generations such as solar and wind power, negative impacts of the large-scale integration of renewable energy on the bulk grid cannot be ignored. Thus, grid integration testing of inverter-coupled renewable energy is essential. For this reason, a high power gird simulator capable of emulating various types of realistic grid conditions is needed for...
A novel single-phase five-level active rectifier based on the VIENNA-type rectifier with model predictive current control is presented. The proposed topology operates in unidirectional mode, imposing a sinusoidal grid-side current with unitary power factor. A unidirectional electric vehicle battery charger is the target application in which the proposed rectifier is used; however, it can also be used...
DC capacitor voltage imbalance is an inherent problem limited the further development of multi-level Neutral Point Clamped (NPC). In this paper, a new hybrid control method based on Space Vector Pulse Width Modulation (SVPWM) for five-level NPC at high modulation index and high power factor is presented. By choosing appropriate switching pattern in lower modulation index sectors and collocating different...
A three-phase three-port rectifier (TPTPR), which is capable of handling an AC port, a low voltage DC port and a high voltage DC port simultaneously, is presented in this paper. To directly transfer power from the AC port to the low voltage DC port within single-stage power conversion, a modified SVPWM strategy based on asymmetric three-level vector space is analyzed and evaluated in this paper. With...
A capacitor voltage-balancing control strategy based on switching state redundancies is proposed for the hybrid stacked five-level converter. In order to obtain the balancing properties for flying capacitors, a hybrid model in state-space representation is established by considering the continuous and discrete variables. The proposed balancing strategy can control the flying capacitor voltages to...
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