Results 221 to 230 of about 1,485 (260)

Indirect Control of Capacitor Voltage Ripple and Circulating Current in a Modular Multilevel Converter

IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society, 2018
Model predictive control is a promising approach to control a multi-objective modular multilevel converter (MMC). In this approach, the control objectives of MMC are included in a single cost function and evaluated for all possible switching states by using weighting factors.
Apparao Dekka, Bin Wu 0007, Venkata Yaramasu, Abdul Rahiman Beig, Navid Reza Zargari   +4 more
openaire   +1 more source

Charging High Voltage capacitors in pulsed power applications with a Capacitor Diode Voltage Multiplier of reduced size and lower ripple currents

2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe), 2020
The Cockroft-Walton multiplier is an established converter to generate high voltage, that can be used to charge capacitors for pulsed power applications. In this paper the drawbacks for this use case are shown and with the Two Phase Capacitor Diode Voltage Multiplier Type A a promising alternative solution is presented.
Tristan Weinert, Wolfgang Oberschelp, Gunter Schroder   +2 more
openaire   +1 more source

Capacitor voltage ripple reduction and arm energy balancing in MMC-HVDC

2016 IEEE 16th International Conference on Environment and Electrical Engineering (EEEIC), 2016
Modular Multilevel Converters are emerging and widely used in HVDC applications. However, the submodule capacitors are still large and the energy balancing under unbalanced conditions is a challenge. In this paper, an analytical model focusing on the energy stored in the capacitors and voltage variations is utilized in order to achieve better ...
Parikh, Harsh; id_orcid 0000-0003-1848-4990, Martin-Loeches, Ruben Sánches, Tsolaridis, Georgios, Teodorescu, Remus; id_orcid 0000-0002-2617-7168, Máthé, Lászlo; id_orcid 0000-0002-1029-3340, Chaudhary, Sanjay K.; id_orcid 0000-0001-8812-3571   +5 more
openaire   +2 more sources

Capacitor Voltage Ripple Reduction Modulation Method for String Photovoltaic Inverters

2019 21st International Middle East Power Systems Conference (MEPCON), 2019
This paper proposes a new pulse width modulation (PWM) method for reducing capacitor voltage ripples in H-bridge five-level T-type inverters for grid-connected single-phase photovoltaic (PV) string inverter applications. The T-type inverters have been widely employed in several applications due to their superior performance.
Mokhtar Aly, Emad M. Ahmed, Samir Kouro, Masahito Shoyama   +3 more
openaire   +1 more source

Analysis of Submodule Capacitor Voltage Ripple and Second-Harmonic Current in MMCs

2019 20th Workshop on Control and Modeling for Power Electronics (COMPEL), 2019
This paper presents a straightforward approach to analyze the 2nd harmonic currents in modular multilevel converters. The submodule capacitor voltage ripple is derived based upon the capacitor’s charge variations instead of commonly used energy variations, resulting in simplified calculations and an explicit expression for the voltage ripple to ...
Xianghua Shi, Shaahin Filizadeh, Liwei Wang   +2 more
openaire   +1 more source

Equivalent Model of Modular Multilevel Converter Considering Capacitor Voltage Ripples

IEEE Transactions on Power Delivery, 2019
Modular multilevel converter (MMC) is regarded as a topology with high potential for high-voltage direct current transmission system. However, the distributed capacitors lead to significant submodule capacitor voltage ripples, which have great influence on the terminal characteristics of MMC.
Yajun Ma, Hua Lin, Zhe Wang
openaire   +1 more source

Bypass capacitance and voltage ripple considerations for resonant switched capacitor converters

2017 IEEE 18th Workshop on Control and Modeling for Power Electronics (COMPEL), 2017
Resonant switched capacitor dc-dc converter designs are commonly optimized based on flying capacitance constraints. However, for an actual circuit design, the total available capacitance is further constrained by the need for bypass capacitance at the input and output nodes.
Jan S. Rentmeister, Jason T. Stauth
openaire   +1 more source

Analytical calculation of the voltage ripple on the input capacitor of the voltage-PWM inverter for high frequency operation

2015 IEEE International Telecommunications Energy Conference (INTELEC), 2015
In this paper, an analytical expression for the DC bus harmonics on the input capacitor, caused by a three phase pulse width modulation (PWM) inverter of a high speed motor drive system, is derived. As the result, we found that the parasitic line inductance between the battery and the input capacitor, and the input capacitor are indirectly proportional.
Shun Endo, Yasuki Kanazawa, Masayoshi Yamamoto   +2 more
openaire   +1 more source

Digital compensation of DC-DC converter voltage ripple for Switched-Capacitor Power Amplifiers

2016 14th IEEE International New Circuits and Systems Conference (NEWCAS), 2016
This paper presents a novel method to digitally compensate the voltage ripple of a DC-DC switching converter supplying a Switched-Capacitor Power Amplifier (SCPA). Switched DC-DC converters are highly efficient, but their output voltage exhibits a small switching ripple.
Stefan Trampitsch, Daniel Gruber, Michael Lunglmayr, Edwin Thaller, Mario Huemer   +4 more
openaire   +1 more source

Reduction of DC-bus voltage ripples and capacitors for single-phase PWM-controlled rectifiers

IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society, 2012
The problem of voltage/current ripples is a primary concern for DC systems, e.g. those with fuel cells and batteries. It could seriously deteriorate the system performance on both the source side and the load side. In this paper, a single-phase PWM-controlled rectifier is taken as an example to analyse the ripple energy that causes the voltage ripples ...
Qing-Chang Zhong, Wen-Long Ming, Xin Cao 0006, Miroslav Krstic   +3 more
openaire   +1 more source