Showing papers on "Decoupling (electronics) published in 2022"

Resonating Power Decoupling Using Multifunctional Bidirectional DC/DC Converter in Hybrid Railway Traction Application

Abstract: For the single-phase high-power railway traction system, the inevitable second-order resonating power has become a critical issue to the traction system. In this article, a power-decoupling solution is proposed to replace the conventional passive LC resonance filter by utilizing the buck-type bidirectional dc/dc converter (BBDC) of hybrid electric multiple units, which is designed to power the train in nonelectrified routes using the on-board battery. By considering both the current ripples in the battery mode and the power decoupling in the catenary mode, the corresponding parameter design process of the BBDC is presented. Based on the power coupling phenomenon and the spectrum characteristic of the BBDC, a direct resonance control method is proposed to decouple the low-order resonating power. Simulations and experiments are carried out to validate the effectiveness of the new proposal. The results demonstrate that the proposal is almost the same as using the conventional passive LC resonance filter for power decoupling in both steady and dynamic operation scenarios.

A Dual-DC Output Three-Phase Three-Level AC–DC Converter for Low-Frequency Pulsed Power Decoupling Applications

Abstract: A dual-dc output three-phase three-level ac–dc converter is proposed for low-frequency pulsed power decoupling applications. One of the dc output is connected to the dc pulsed load, whereas the other one is used as power decoupling port and connected to the decoupling capacitor. The voltage of the power decoupling dc port can vary in a wide range to reduce the value and volume of the power decoupling capacitor. A buck/boost converter is employed to interface the power decoupling port with the dc pulsed load. A modified space vector pulsewidth modulation strategy is proposed for the ac–dc converter, based on which independent voltage and power regulation of the two dc outputs is achieved. The steady-state power is directly fed to the dc load with single power conversion stage, and the low frequency pulse power is fed to the power decoupling port. As a result, high-power quality and efficient power decoupling with reduced power conversion stages are achieved. Operation principles, modulation, and control strategies of the ac–dc converter are analyzed in detail. A prototype is built and tested to verify the effectiveness and feasibility of the proposed ac–dc converter for pulsed load.

An Adaptive Disturbance Decoupling Perspective to Longitudinal Platooning

Abstract: Despite the progress in the field of longitudinal formations of automated vehicles, only recently an interpretation of longitudinal platooning has been given in the framework of disturbance decoupling, i.e., the problem of making a controlled output independent of a disturbance. The appealing feature of this interpretation is that the disturbance decoupling approach naturally yields a decentralized controller that guarantees stability and string stability. In this work, we further exploit the disturbance decoupling framework and we show that convergence to a stable, string stable and disturbance decoupled behavior can be achieved even in the presence of parametric uncertainty of the engine time constant. We refer to this framework as adaptive disturbance decoupling.

Decoupling Capacitor Minimization of an MMC-Based Photovoltaic System With Three-Winding Power Channel

Abstract: This article proposed a grid-connected photovoltaic (PV) converter based on modular multilevel converter (MMC), which can realize long-distance dc transmission while realizing the local consumption of PV. In addition to the advantage that there is no PV power mismatch between the upper and lower arms, the isolation transformer couples the two submodules of the upper and lower arms on a three-port transformer, and the differential-mode components of the capacitor voltage ripples in the upper and lower arms can be canceled between each other. Besides, through the double fundamental frequency circulating current control, the power exchange among MMC phase units can be realized, thereby eliminating the common-mode component of the capacitor voltage ripple. Through the combination of topology and control strategy, the low-frequency components of the voltage ripple can be completely canceled. Since the decoupling capacitance is reduced dozens of times, the volume and cost of the system are significantly reduced. Therefore, the life and reliability of the system are increased. Simulation and experimental results verify the effectiveness of the proposed topology and its control strategy.

The methods and factors of decoupling energy usage and economic growth

Abstract: Climate change mitigation is one of the biggest problems of the 21st century with anthropogenic carbon dioxide emissions having exceeded the carrying capacity for the planet. The primary contributor to the emissions is increasing nonrenewable energy consumption coupled with economic growth. A major area of social sciences is the study of decoupling energy-related emissions and energy usage from continuous economic growth. The goal of this review paper is to analyze various studies that have focused on decoupling energy and economy, regionally, nationally, and globally. The reviewed 93 investigations show that three kinds of methodologies are employed for decoupling analysis—structural decomposition, index decomposition, and statistical methods. The main factors that inhibit decoupling were found to be economic growth, fossil fuel consumption, and urbanization of population, while the factors that promoted decoupling were found to be energy intensity reduction and emission intensity reduction. A comparative analysis of the two promoting factors for decoupling revealed that emission intensity reduction is easier to implement than energy intensity reduction, because emission intensity does not depend on the fluctuations of economic growth. It is proposed that emission intensity reduction research needs to be accelerated for accurate policy decisions.

A Novel Partial Decoupling Control for Three-Tank Liquid Level System

Abstract: This work investigates a novel partial decoupled control based on Port-Controlled Hamiltonian (PCH) model for three-tank liquid level system. Different from the traditional decoupling control, which is mainly in frequency domain, the method proposed in this paper is implemented directly in time domain. According to the specific requirements of liquid level system control objectives, partial decoupling control is realized by a simply transform. In order to prove the stability, PCH principle is introduced. The simulation results compared with the traditional PCH method illustrate the good performance of the proposed algorithm.