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Introductory Topics in Circuit Simulation
Published in Jan Ogrodzki, Circuit Simulation Methods and Algorithms, 2018
Electrical circuits are constructed by connecting together a number of branches with common terminals known as circuit nodes. Each branch has two terminals - an initial node and a final node, with the branch current flowing from the initial node to the final one. Each circuit node joins the initial and/or final terminals of a number of branches. Knowing which node each branch is connected to defines the circuit structure, also termed the circuit topology. Thus, to define the circuit two things are necessary: the characterization of individual branches and the topological information.
High-Power Converters and Challenges in Electric Vehicle Wireless Charging – A Review
Published in IETE Journal of Research, 2023
S. Kodeeswaran, M. Nandhini Gayathri, P. Sanjeevikumar, Rafael Peña-Alzola
The circuit topology proposed by Bojarski et al. [22] attained a high efficiency with a wide range of output voltage between the EV battery and input source from the grid, as illustrated in Figure 9. The essential requirements for EV battery charging such as high output power, output voltage, and the coils’ high coupling coefficient can be achieved using this circuit topology. In this circuit, multi-cell transformers (T1, T2, … ., TN) are used to achieve phase control and limit the circulating current in the switches. Each multi-cell transformer has an equal number of turns on the primary and secondary sides. While analyzing the circuit, it needs to be assumed that all the transformers have the same leakage and magnetizing inductance [33]. The coils Lp, Ls, and the resonant capacitors Cp and Cs are used in the wireless power link with a coupling factor. The controller is designed for operating the converter with a resonant frequency. Cascaded Multilevel Converter
Direct Power and Voltage Oriented Control Strategies of Grid-Connected Wind Energy Conversion System Based on Permanent Magnet Synchronous Generator
Published in Cybernetics and Systems, 2022
Abdessami Soyed, Ameni Kadri, Othman Hasnaoui, Faouzi Bacha
A circuit topology of the IMC is illustrated in Figure 5. The rectifier stage is composed of six bi-directional switches built with 12 unidirectional switches, while the inverter stage has six unidirectional switches. Filters are placed at the input and outputs of the IMC to adequately remove high-order harmonics that otherwise affect the DG unit and the quality of the power delivered to the grid. For the output filter, a parallel capacitor bank and series inductors, Cf and Lf, respectively, are used to filter the current high-frequency components. In all cases, the total harmonic distortions (THD) for input currents and output voltages should be less than 5% (Friedli et al. 2012; Soyed et al. 2019). Figure 6 gives the rectifier stage of the rectifier.
Buck-boost converter with simple gate control for renewable energy applications
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2020
Muhammad Ado, M Saad BinArif, Awang Jusoh, Abdulhamid Usman Mutawakkil, Ibrahim Mohammed Danmallam
This paper proposes a buck-boost converter for renewable energy applications which overcomes these limitations of overlap-time and dead-time (Ado et al. in press). The requirement for overlap and/or dead-time were eliminated due to the proposed converter’s utilization of a quasi-impedance source converter (q-ZSC/q-ISC) topology (Anderson and Peng 2008) shown in Figure 3. The circuit topology of the proposed converter is shown in Figure 4. q-ZSCs are a class of impedance source converts (ZSCs) (Peng 2003). Reference (Cao and Peng 2009) proposed DC-DC q-ZSCs with (Ado et al. 2018b) and (Ado et al. 2018a) proposing additional topologies each. The elimination of the dead-time and overlap-time results in the proposed converter needing a simple gate control signal for its performance. This simplicity is because both the dead and overlap-time need not to be provided in the pulse-width modulation (PWM) signal for its gate control. Impedance source converters (ISCs) are a class of power converters that permit both ST and OC limitation of traditional power converters (current source and voltage source converters) without causing over-current or over-voltage (Ado et al. 2019b).