Current controller design for high switching frequency converters

2016 ◽  
Author(s):  
Roghayeh Gavagsaz-Ghoachani ◽  
Matheepot Phattanasak ◽  
Majid Zandi ◽  
Jean-Philippe Martin ◽  
Babak Nahid-Mobarakeh ◽  
...  
Keyword(s):  
Controller Design ◽  
Switching Frequency ◽  
Frequency Converters ◽  
Current Controller ◽  
High Switching Frequency

scholarly journals Insulation Life Span of Low-Voltage Electric Motors—A Survey

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1738
Author(s):  
Vanessa Neves Höpner ◽  
Volmir Eugênio Wilhelm
Keyword(s):  
Life Span ◽  
Electric Motor ◽  
Low Voltage ◽  
Frequency Converter ◽  
Rate Of Change ◽  
High Rate ◽  
Switching Frequency ◽  
Electric Motors ◽  
Frequency Converters ◽  
High Switching Frequency

The use of static frequency converters, which have a high switching frequency, generates voltage pulses with a high rate of change over time. In combination with cable and motor impedance, this generates repetitive overvoltage at the motor terminals, influencing the occurrence of partial discharges between conductors, causing degradation of the insulation of electric motors. Understanding the effects resulting from the frequency converter–electric motor interaction is essential for developing and implementing insulation systems with characteristics that support the most diverse applications, have an operating life under economically viable conditions, and promote energy efficiency. With this objective, a search was carried out in three recognized databases. Duplicate articles were eliminated, resulting in 1069 articles, which were systematically categorized and reviewed, resulting in 481 articles discussing the causes of degradation in the insulation of electric motors powered by frequency converters. A bibliographic portfolio was built and evaluated, with 230 articles that present results on the factors that can be used in estimating the life span of electric motor insulation. In this structure, the historical evolution of the collected information, the authors who conducted the most research on the theme, and the relevance of the knowledge presented in the works were considered.

scholarly journals Hybrid Multimodule DC-DC Converters for Ultrafast Electric Vehicle Chargers

Energies ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4949
Author(s):  
Mena ElMenshawy ◽  
Ahmed Massoud
Keyword(s):  
Power Density ◽  
High Power ◽  
High Efficiency ◽  
Controller Design ◽  
Power Level ◽  
Power Converter ◽  
Total Power ◽  
Switching Frequency ◽  
High Power Density ◽  
High Switching Frequency

To increase the adoption of electric vehicles (EVs), significant efforts in terms of reducing the charging time are required. Consequently, ultrafast charging (UFC) stations require extensive investigation, particularly considering their higher power level requirements. Accordingly, this paper introduces a hybrid multimodule DC-DC converter-based dual-active bridge (DAB) topology for EV-UFC to achieve high-efficiency and high-power density. The hybrid concept is achieved through employing two different groups of multimodule converters. The first is designed to be in charge of a high fraction of the total required power, operating at a relatively low switching frequency, while the second is designed for a small fraction of the total power, operating at a relatively high switching frequency. To support the power converter controller design, a generalized small-signal model for the hybrid converter is studied. Also, cross feedback output current sharing (CFOCS) control for the hybrid input-series output-parallel (ISOP) converters is examined to ensure uniform power-sharing and ensure the desired fraction of power handled by each multimodule group. The control scheme for a hybrid eight-module ISOP converter of 200 kW is investigated using a reflex charging scheme. The power loss analysis of the hybrid converter is provided and compared to conventional multimodule DC-DC converters. It has been shown that the presented converter can achieve both high efficiency (99.6%) and high power density (10.3 kW/L), compromising between the two other conventional converters. Simulation results are provided using the MatLab/Simulink software to elucidate the presented concept considering parameter mismatches.

scholarly journals An Optimal Current Controller Design for a Grid Connected Inverter to Improve Power Quality and Test Commercial PV Inverters

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Ali Algaddafi ◽  
Saud A. Altuwayjiri ◽  
Oday A. Ahmed ◽  
Ibrahim Daho
Keyword(s):  
Controller Design ◽  
Harmonic Distortion ◽  
Switching Frequency ◽  
Resistive Load ◽  
Lcl Filter ◽  
Fast Fourier Transform Analysis ◽  
Pv Inverter ◽  
Grid Connection ◽  
Current Controller ◽  
Grid Connected Inverter

Grid connected inverters play a crucial role in generating energy to be fed to the grid. A filter is commonly used to suppress the switching frequency harmonics produced by the inverter, this being passive, and either an L- or LCL-filter. The latter is smaller in size compared to the L-filter. But choosing the optimal values of the LCL-filter is challenging due to resonance, which can affect stability. This paper presents a simple inverter controller design with an L-filter. The control topology is simple and applied easily using traditional control theory. Fast Fourier Transform analysis is used to compare different grid connected inverter control topologies. The modelled grid connected inverter with the proposed controller complies with the IEEE-1547 standard, and total harmonic distortion of the output current of the modelled inverter has been just 0.25% with an improved output waveform. Experimental work on a commercial PV inverter is then presented, including the effect of strong and weak grid connection. Inverter effects on the resistive load connected at the point of common coupling are presented. Results show that the voltage and current of resistive load, when the grid is interrupted, are increased, which may cause failure or damage for connecting appliances.

scholarly journals ZVS based on dead-time analysis of three port half bridge converters

2020 ◽  
Vol 11 (4) ◽  
pp. 1936
Author(s):  
Phuong Vu ◽  
Manh Linh Nguyen ◽  
Viet Phuong Pham
Keyword(s):  
Dead Time ◽  
Load Condition ◽  
Switching Frequency ◽  
Safe Operation ◽  
Zero Voltage Switching ◽  
Frequency Converters ◽  
High Switching Frequency ◽  
Power Loss Reduction ◽  
The Dead ◽  
Zero Voltage

In this research, the zero-voltage switching (ZVS) of the GaN FETs-based high frequency three-port half-bridge converter (TPHBC), which is capable of interfacing a renewable energy source, an energy storage and a load is discussed. To achieve ZVS, which plays a key role in power loss reduction of the high switching frequency converters, not only the parasitic elements but also the dead-time between two switches in one converter arm must be taken into account. This research gives a detail analysis about the influence of the dead-time on the ZVS condition. Based on the analysis, a minimum dead-time which guarantees not only the ZVS but also the safe operation of the converter is obtained. Simulations in various load condition of the TPHBC are carried out to verify the validity and effectiveness of the proposed method.

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