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Pseudo single stage flyback current source inverter designed for photovoltaic applications is presented in this paper. The proposed inverter consists of flyback current source converter and h-bridge unfolding stage. The proposed system is intended to do the following functions: extract maximum power for the Photovoltaic (PV) module, inject a sinusoidal current into the grid. Flyback converter is designed...
This paper presents a new control algorithm of High Instantaneous Power Impulse Converter (HIPIC). HIPIC is characterized by high power in megawatt range delivered to the output in very short time. A new algorithm allows fast rising of output current to the set value and a proper peak current control during the impulse by using two types of controllers: hysteresis and PID. Moreover capacitor voltage...
This paper proposes a new fault detection method for the modular multilevel converter (MMC) semiconductor power switches. While in common MMCs, the modules capacitor voltages are measured directly for control purposes, in this paper voltage measurement point changes to module output terminal improving fault diagnosis ability. Based on this measurement reconfiguration, a novel fault detection algorithm...
The Cuk converter is a non-isolated DC-DC converter having fourth-order and non-linear dynamic characteristics. In this paper, an output feedback controller is proposed for the regulation of the negative output Cuk converter. The main advantage of the proposed controller is only the output voltage state variable is used for feedback purposes. This eliminates the use of the current sensor. Various...
Equivalent circuits of Modular Multilevel Converters (MMCs) and Voltage-Source Converters (V SCs) are developed to predict that MMCs are suited for series connection for Ultra High Voltage MMC-HVDC transmission and for parallel connection as Multi-terminal MMC-HVDC. Simulations validate the predictions.
This paper deals with a power management mechanism using Modular Multilevel Converter (MMC) with integrated energy storage elements, the typical use of which could be a grid-interface for a photovoltaic park or a charging park for electric vehicles. In comparison with the currently commonly used topologies of MMC, which use submodule DC/DC converters to control the submodule voltages at the half-bridge...
Dual three-phase (asymmetrical six-phase) induction motors have received significant attention in high power medium voltage drive applications. Typically, two three-phase voltage source converters are needed to feed such a drive system. In medium voltage applications, multilevel inverters are preferred as they provide a stepped output voltage waveform that reduces dv/dt stresses and provides a better...
The KY converter, which features fast transient response, non-pulsating output current and simple structure, is a novel step-up topology to overcome the disadvantages of the traditional boost converter. Therefore, in this paper, based on the method of state-space averaging, the KY converter, including the inductor copper resistance and the output capacitor resistance is analyzed and modeled as a small-signal...
The KY boost converter, which combines the KY converter and the traditional synchronously rectified (SR) boost converter, is a novel step-up converter to overcome the disadvantages of the KY converter, which has a quite low voltage gain. Compared with the KY converter, the KY boost converter has one additional inductor and one additional capacitor. Therefore, the dynamic characterization of the KY...
In this study, a high voltage-boosting converter is presented, which combines a coupled inductor, a charge pump capacitor, and active clamp circuit, so as to boost up the output voltage as well as to make the main switch turned on with zero voltage switching. In this converter, the coupled inductor behaves as not only an inductor but also a transformer. And, the active clamp switch in the active clamp...
In this paper, the proposed sampling structure based on one-comparator sampling is presented, which can improve the transient response. This method is verified by a synchronously-rectified buck converter with switching frequency of 240kHz, and the digital controller takes as a control kernel the EP1C3T100 FPGA created by Altera Co., along with the VHDL language to program this controller.
This paper aims to focus on the smooth output of Buck converters under the input perturbations and load disturbances using the high-order sliding mode controller with a differentiator (HOSMD) based on the only measurement of output voltage. Theoretical analysis and design procedures of the controller designed by prescribed control law, one of the high-order sliding modes, are presented in detail....
A 4-phase wound-field doubly salient generator is researched in this paper. The no-load situation is analyzed ideally and simulated by finite element method. The average inductance of the phase winding, which reaches over 50mH, causes low power factor and decreases the output power. To improve the output power, the capacitors are introduced to compensate the inductive current. For the no-load situation,...
The impedance modeling of modular multilevel converters (MMCs) is a prerequisite for applying the impedance-based stability analysis method to an MMC-based high-voltage direct current (MMC-HVDC) transmission system. The objective of this paper is to develop impedance models of a three-phase MMC in order to assess its stability. The analytical ac-side and dc-side impedance models of the three-phase...
In this paper a new voltage measurement technique for modular multilevel converter (MMC) capacitors is proposed. While all the capacitors voltages should be known for closed loop control of MMCs, only the arms voltages are measured employing the proposed method. Therefore, the number of voltage sensors reduced dramatically to one per arm. The capacitors voltage quantities are updated continuously...
This paper presents a novel terminal sliding mode (TSM) control scheme with double closed-loop structure of capacitor voltage and inductance current for the stability control of DC-DC buck converter. In order to satisfy the different performance demands of capacitor voltage and inductance current, a TSM controller and a linear sliding mode (LSM) controller is designed separately. For the former, TSM...
Industrial modular multilevel converter (MMC) controllers usually implement the sub-module (SM) capacitor voltage balance control (VBC) in field-programmable gate array (FPGA) boards. Conventional VBC methods need to sort out the capacitor voltages, where the sorting algorithm would become too complex to be accommodated in FPGA if the SM number is large. A sorting-less VBC optimized for FPGA implementation...
High voltage pulse generators can be used effectively in water treatment applications, as applying a pulsed electric field on the infected sample guarantees killing of harmful germs and bacteria. In this paper, a new high voltage pulse generator with closed loop control on its output voltage is proposed. The proposed generator is based on DC-to-DC boost converter in conjunction with capacitor-diode...
This paper presents a model predictive control (MPC) scheme for quasi-Z source (qZS) three-phase four-leg inverters. In order to cope with drawbacks of the traditional voltage source inverters (VSI)s, the qZS three-phase four-leg inverter topology is proposed in this study. To improve control capability of the controller, the MPC scheme is used. The proposed MPC is based mainly on the discrete-time...
Phase shifted carrier modulation is an industry standard in its application to multi-level H-bridge Converters. The major advantage of this scheme over level shifted and space vector modulation schemes is its inherent ability to evenly distribute losses between semiconductor devices. However, it has been demonstrated in literature that level shifted and space vector schemes have superior harmonic...
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