scholarly journals DC-Link Capacitor Voltage Balancing Control of a Five-Level Regenerative AC Electronic Load Using One-Cycle Control

Energies ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 6101
Author(s):  
In Wha Jeong
Keyword(s):  
Power Converters ◽  
Product Liability ◽  
Balance Performance ◽  
Nonlinear Loads ◽  
Ac Power ◽  
Capacitor Voltage ◽  
Voltage Balance ◽  
Testing Medium ◽  
Electronic Load ◽  
Capacitor Voltage Balance

High voltage electric power equipment requires rigorous regulation testing to specific standards which ensure proper and safe operation in the grid. Manufacturers conduct these tests in order to prove standard compliance and product liability. Variable linear or nonlinear loads are necessary for testing medium voltage (MV) high power AC power converters. Generally, those AC power converters or power supplies require performance validation, burn-in and/or lifetime testing under different load conditions, defined by the end-user or standards for the given applications. For flexible and efficient MV verification testing, this paper presents a five-level multilevel converter-based MV regenerative AC electronic load with one-cycle control (OCC), which is based on five-level diode-clamped multilevel converters with back-to-back structure and can emulate any impedance load. In this paper, especially the dc-link capacitor voltage balance of the proposed multilevel MV regenerative AC load is deeply analyzed. Simulation and experimental results are presented to verify the dc-link voltage balance performance of the proposed multilevel MV regenerative AC electronic load.

scholarly journals Analysis of Capacitor Voltage Imbalance in Hybrid Converters and Inherently Balanced Operation Using Symmetric Architecture

2021 ◽  
Author(s):  
Ratul Das ◽  
Hanh-Phuc Le
Keyword(s):  
Direct Result ◽  
Balance Performance ◽  
Hardware Implementations ◽  
Capacitor Voltage ◽  
Voltage Balance ◽  
Flying Capacitors ◽  
The Difference ◽  
Intuitive Method ◽  
Capacitor Voltage Balance ◽  
Hybrid Converters

<p>This paper investigates the origin of the flying capacitor voltage imbalance in hybrid converters. By observation and logical deduction, an intuitive voltage-charge relationship is established which can give a general explanation of the flying capacitor voltage balance in hybrid converters. This relationship can establish a relatively simple and intuitive method to identify the difference of balance performance in hybrid converters for Vout<(V<sub>in</sub> /N) cases. Converter with even number of inductor charging intervals, are shown to be susceptible to flying capacitor voltage imbalance, while flying capacitors in hybrid converters with inductors having odd charging intervals have inherently balanced operations. As a direct result of the analysis, a new symmetric operation of FCML converters is introduced to achieve an inherent balance of flying capacitor voltages. Hardware implementations and experiments have been carried out for verifications of the analytical analysis and the new symmetric operation.</p>

scholarly journals Analysis of Capacitor Voltage Imbalance in Hybrid Converters and Inherently Balanced Operation Using Symmetric Architecture

2021 ◽  
Author(s):  
Ratul Das ◽  
Hanh-Phuc Le
Keyword(s):  
Direct Result ◽  
Balance Performance ◽  
Hardware Implementations ◽  
Capacitor Voltage ◽  
Voltage Balance ◽  
Flying Capacitors ◽  
The Difference ◽  
Intuitive Method ◽  
Capacitor Voltage Balance ◽  
Hybrid Converters

<p>This paper investigates the origin of the flying capacitor voltage imbalance in hybrid converters. By observation and logical deduction, an intuitive voltage-charge relationship is established which can give a general explanation of the flying capacitor voltage balance in hybrid converters. This relationship can establish a relatively simple and intuitive method to identify the difference of balance performance in hybrid converters for Vout<(V<sub>in</sub> /N) cases. Converter with even number of inductor charging intervals, are shown to be susceptible to flying capacitor voltage imbalance, while flying capacitors in hybrid converters with inductors having odd charging intervals have inherently balanced operations. As a direct result of the analysis, a new symmetric operation of FCML converters is introduced to achieve an inherent balance of flying capacitor voltages. Hardware implementations and experiments have been carried out for verifications of the analytical analysis and the new symmetric operation.</p>

scholarly journals Pulsewidth Modulations for the Comprehensive Capacitor Voltage Balance of $n$-Level Three-Leg Diode-Clamped Converters

2009 ◽  
Vol 24 (5) ◽  
pp. 1364-1375 ◽  
Author(s):  
Sergio Busquets-Monge ◽  
Salvador Alepuz ◽  
Joan Rocabert ◽  
Josep Bordonau
Keyword(s):  
N Level ◽  
Capacitor Voltage ◽  
Voltage Balance ◽  
Capacitor Voltage Balance

scholarly journals A general review of power quality standards and terminologies

2021 ◽  
Vol 23 (12) ◽  
pp. 102-145
Author(s):  
V.A Deshmukh ◽  
◽  
B. Sridhar ◽  
Keyword(s):  
Energy Conservation ◽  
Power Quality ◽  
Power Converters ◽  
Quality Standards ◽  
Financial Loss ◽  
Nonlinear Loads ◽  
Network Interconnection ◽  
General Review ◽  
Ac Power ◽  
Analytical Quantification

In the next few years, more than 80% of AC power is to be processed through power converters owing to their benefits of energy conservation, flexibility, network interconnection, and weight and volume reduction in a number of equipment such as lighting arrestors, HVAC computers, fans, and so on.This paper gives an introduction on power quality (PQ), causes and effects of power quality problems. It also deals with power quality definitions, terminologies, standards, bench-marks, monitoring requirements, financial loss, and analytical quantification. It also discusses various types of nonlinear loads, which cause these power quality problems, they are illustrated, classified, modeled, quantified, and analyzed forassociated power quality issues.

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