This letter proposes a currentless sorting and selection (SAS)-based capacitor-voltage-balancing method for modular multilevel converters. Without the knowledge of arm-current signals, this method has almost the same performance as the conventional SAS method while reducing the sampling signals, compacting the control system, and saving the …
One-step and two-step KOH activation of Acer truncatum seed shells are compared.One-step activation at 800 C develops activated carbons with excellent porosity. • OAAS-based capacitor presents a high capacitance of 361 F …
Aiming at problem of large calculation amount and high switching frequency existing in traditional capacitor voltage balancing method, a novel balancing optimization method for DC capacitor ...
4. MMC capacitor voltage optimization sorting algorithm 4.1. Traditional sorting algorithm The most widely used capacitor voltage balance control in MMC is based on the sequencing method. That is to say, in each switching cycle, the capacitance voltage of
This paper presents a Two-Way Merge Sort (TWMS) strategy based on the prediction of the capacitor voltages under ideal conditions. It also proposes an …
An quasi-online equivalent series resistance (ESR) identification method that considers the impact of capacitance based on variational mode decomposition (VMD) of forward converters is proposed in this letter. First, the capacitance impact is included in ESR derivation. Subsequently, VMD is adopted to process characteristic …
that combines the retention factor method with an improved quick sorting algorithm, and the main contri-butions are outlined below: 1. Enhancing the traditional quick sort method, enabling it to sort submodule capacitance voltages with only half the number of
A novel control method is presented in this paper which utilizes the concept of capacitor charge balance to achieve optimal dynamic response for buck converters undergoing a rapid load change. The proposed charge balance method is implemented with analog components and is cheaper and more effective than its digital counterparts since …
In order to balance the capacitor voltages, a fundamental frequency sorting strategy with Phase Disposition PWM is proposed in this paper. A dual sorting method, which sorts …
A capacitor shell and processing device technology, applied in sorting, metal processing, metal processing equipment and other directions, can solve the problems of low qualified rate of batches of workpieces, unfavorable collection and packaging of workpieces, and inability to detect in time, etc. Convenient post-processing, small span effect
This paper presents a Two-Way Merge Sort (TWMS) strategy based on the prediction of the capacitor voltages under ideal conditions and proposes an innovative Insertion Sort Correction for the TWMS to solve issues in practical engineering under non-ideal conditions. The Modular Multilevel Converter (MMC) is particularly attractive for …
In the traditional NLC-based sorting algorithm, the capacitor voltages are sorted to an ascending voltage table at the beginning of each control cycle. Then proper SMs are …
To address the problem, a modified capacitor voltage balancing sorting algorithm is proposed in this paper. The proposed algorithm could avoid sorting all the …
The traditional method, which uses the sorting results of the SM capacitor voltages and fires the IGBTs directly, leads to relatively higher power losses.
SIEMASZKO: FAST SORTING METHOD FOR BALANCING CAPACITOR VOLTAGES IN MODULAR MULTILEVEL CONVERTERS 465 Fig. 3. Hierarchical structure and communication between controllers and submodules.
In this paper, numerical method for determining the capacitance of a conducting oblate spheroidal shell has been established. An explicit finite difference technique for solving ...
Capacitor voltage variation under different conditions: (a) Capacitor voltage variation of using TWMS with different control periods, (b) Capacitor voltage variation of using ISC-TWMS with ...
Aiming at the DC capacitor voltage balancing problem of a modular multilevel converter (MMC) with large-scale sub-modules, a novel balancing method based on modified sorting ...
A Fast Modeling Method for EMI Sources in MMC Based on Nearest Level Modulation and Capacitor Voltage Sorting Algorithm May 2021 DOI: 10.1109/ECCE-Asia49820.2021.9479104
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