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Smart Transformer-based Medium Voltage Grid Support by Means of Active Power Control 被引量:5
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作者 Stefano Giacomuzzi Marius Langwasser +2 位作者 Giovanni De Carne Giuseppe Buja Marco Liserre 《CES Transactions on Electrical Machines and Systems》 CSCD 2020年第4期285-294,共10页
In the last decades the voltage regulation has been challenged by the increase of power variability in the electric grid,due to the spread of non-dispatchable generation sources.This paper introduces a Smart Transform... In the last decades the voltage regulation has been challenged by the increase of power variability in the electric grid,due to the spread of non-dispatchable generation sources.This paper introduces a Smart Transformer(ST)-based Medium Voltage(MV)grid support by means of active power control in the ST-fed Low Voltage(LV)grid.The aim of the proposed strategy is to improve the voltage profile in MV grids before the operation of On-Load Tap Changer in the primary substation transformer,which needs tens of seconds.This is realized through reactive power injection by the AC/DC MV converter and simultaneous decrease of the active power consumption of voltage-dependent loads in ST-fed LV grid,controlling the ST output voltage.The last feature has two main effects:the first is to reduce the active power withdrawn from MV grid,and consequently the MV voltage drop caused by the active current component.At the same time,higher reactive power injection capability in the MV converter is unlocked,due to the lower active power demand.As result,the ST increases the voltage support in MV grid.The analysis and simulation results carried out in this paper show improvements compared to similar solutions,i.e.the only reactive power compensation.The impact of the proposed solution has been finally evaluated under different voltage-dependence of the loads in the LV grid. 展开更多
关键词 smart Transformer Solid State Transformers Load Control Voltage Support
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Smart Transformer/Large Flexible Transformer 被引量:4
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作者 Rongwu Zhu Markus Andresen +5 位作者 Marius Langwasser Marco Liserre Joao Pecas Lopes Carlos Moreira Justino Rodrigues Mario Couto 《CES Transactions on Electrical Machines and Systems》 CSCD 2020年第4期264-274,共11页
Solid-state transformer-based smart transformer(ST)can provide the dc connectivity and advanced services to improve the grid performance and to increase the penetration of the power electronics interfaced resources(e.... Solid-state transformer-based smart transformer(ST)can provide the dc connectivity and advanced services to improve the grid performance and to increase the penetration of the power electronics interfaced resources(e.g.,distributed generators and electric vehicle charging stations)in modern electricity distribution grids.Since the ST is a new and effective paradigm of the electricity grid evolution to well understand the ST,this paper systematically presents the basic architecture and the typical control schemes of the ST and then the advanced services that ST can provide to improve the electricity grids performances in terms of the power flow control,power quality improvement,active damping and active contribution to improve distribution grid resilience by means of enabling autonomous microgrids operation as well as launching a restoration procedure following a general blackout. 展开更多
关键词 smart Transformer voltage control power quality active distribution grid black start
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Hybrid Modular Smart Transformer for Asymmetrically Bidirectional Power Flow Operation
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作者 Kangan Wang Youngjong Ko +3 位作者 Rongwu Zhu Siyu Wu Weimin Wu Marco Liserre 《CSEE Journal of Power and Energy Systems》 SCIE EI CSCD 2024年第4期1384-1398,共15页
The presence of renewable energy resources in LV distribution networks may lead to a distribution transformer,also known as a Smart Transformer(ST),experiencing the bidirectional power flow.Therefore,the ST must have ... The presence of renewable energy resources in LV distribution networks may lead to a distribution transformer,also known as a Smart Transformer(ST),experiencing the bidirectional power flow.Therefore,the ST must have the capability to operate in both directions.However,the reverse power is less as compared to the forward power,thus the design of ST with the same capacity in both directions increases the hardware cost and decreases the system efficiency.This paper proposes a Hybrid-modular-ST(H-ST),composed of a mixed use of single active bridge-based series resonant converter and dual active bridge instead of complete use of uni-or bi-directional converter adopted in the conventional solid-state-transformer.Based on the proposed H-ST,the impacts of power imbalance among cascaded modules in reverse operation mode are analyzed and then an effective solution based on reactive power compensation combined with the characteristics of the proposed architecture is adopted.The simulation and experimental results clearly validate the effectiveness and feasibility of the theoretical analyses. 展开更多
关键词 Cascaded H-bridge dual-active bridge series resonant converter smart transformer(ST) three-stage architecture
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Smart logistics transformation collaboration between manufacturers and logistics service providers:A supply chain contracting perspective 被引量:9
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作者 Weihua Liu Jiahe Hou +1 位作者 Xiaoyu Yan Ou Tang 《Journal of Management Science and Engineering》 2021年第1期25-52,共28页
Intelligent transformation of manufacturers requires smart logistics transformation collaboration,which improves competitiveness.In this study,we construct a Stackelberg game model based on the mutual influence and re... Intelligent transformation of manufacturers requires smart logistics transformation collaboration,which improves competitiveness.In this study,we construct a Stackelberg game model based on the mutual influence and restriction in the relationship between a manufacturer and a logistics service provider(LSP)undergoing smart logistics transformation.We investigate whether cost-sharing(CS)or revenue-sharing(RS)contracts can coordinate the supply chain and suggest a hybrid CSeRS contract to improve performance.We find that,compared with decentralized options,CS and RS contracts achieve a higher level of smart logistics transformation.While the coordination and effectiveness of CS contracts are superior to those of RS contracts,neither can fully coordinate the supply chain.The proposed hybrid CSeRS contract allows the manufacturer to share the LSP’s costs before the transformation and its partial revenue after transformation,so that the LSP can reduce its service charge,thereby achieving full supply chain coordination. 展开更多
关键词 smart logistics transformation Collaborative relationship Cost-sharing contract Revenue-sharing contract Hybrid contract
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