scholarly journals The Underlying Reasons behind the Development of Public Electric Buses in China: The Beijing Case

2020 ◽  
Vol 12 (2) ◽  
pp. 688
Author(s):  
Zeyuan Song ◽  
Yingqi Liu ◽  
Hongwei Gao ◽  
Suxiu Li
Keyword(s):  
Public Transportation ◽  
Local Governments ◽  
Dynamic Game ◽  
Theory Model ◽  
Charging Infrastructure ◽  
Charging Station ◽  
Electric Bus ◽  
Key Factor ◽  
Dynamic Game Model ◽  
Strategic Space

After great efforts towards the development of the electric vehicle (EV) industry and the use of its products in public transportation networks, more electric buses operate in China than in any other country in the world. As more investors will enter the industry, the effect of new participants on the development of the EV industry becomes an important issue. Based on the analysis of several key stakeholders (central and local governments, electric bus producers, users/bus companies, and providers of charging infrastructure in public transportation, this paper constructs a dynamic game-theory model to determine the main participants and their strategic space payoff functions, and ultimately estimates a Nash equilibrium. The dynamic game-model analysis clearly shows that the government’s decision to provide subsidies or not is currently affecting the entire industry and is an important prerequisite for a dynamic game. The user decides the pace of the development of this industry and the user’s management efficiency is a key factor affecting users’ needs. In addition, the availability of EVs and charging station facilities are equally important to the development of the industry.

scholarly journals Charging Schedule for Load Peak Minimization on Large-Scale Electric Bus Depots

2019 ◽  
Vol 9 (9) ◽  
pp. 1748 ◽  
Author(s):  
Amra Jahic ◽  
Mina Eskander ◽  
Detlef Schulz
Keyword(s):  
Public Transportation ◽  
Large Scale ◽  
Peak Load ◽  
Load Profile ◽  
Charging Infrastructure ◽  
Scheduling System ◽  
Electric Bus ◽  
Local Grid ◽  
Load Peak ◽  
The City

The city of Hamburg has decided to electrify its bus fleets. The two public transportation companies in this city expect to operate up to 1500 buses by 2030. In order to accomplish this ambitious goal, both companies need to build an appropriate charging infrastructure. They have both decided to implement the centralized depot charging concept. Buses can therefore charge only at the depot and do not have the possibility for opportunity charging at intermediate stations. The load profile of such a bus depot is highly dependent on the charging schedule of buses. Without an intelligent scheduling system, the buses charge on demand as soon as they arrive to the depot. This can lead to an unevenly distributed load profile with high load peaks, which is problematic for the local grid as well as for the equipment dimensioning at the depot. Charging scheduling on large-scale bus depots is a relatively new and poorly researched topic. This paper addresses the issue and proposes two algorithms for charging scheduling on large-scale bus depots with the goal to minimize the peak load. The schedules created with the proposed algorithms were both tested and validated in the Bus Depot Simulator, a cosimulation platform used for bus depot simulations.

scholarly journals Design and Validation of Ultra-Fast Charging Infrastructures Based on Supercapacitors for Urban Public Transportation Applications

Energies ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 2348 ◽  
Author(s):  
Fernando Ortenzi ◽  
Manlio Pasquali ◽  
Pier Paolo Prosini ◽  
Alessandro Lidozzi ◽  
Marco Di Benedetto
Keyword(s):  
Public Transportation ◽  
Storage System ◽  
Experimental Tests ◽  
Energy Storage System ◽  
Charging Infrastructure ◽  
Electrical Grid ◽  
Charging System ◽  
Electric Bus ◽  
Fast Charging ◽  
Charging Current

The last few decades have seen a significant increase in the number of electric vehicles (EVs) for private and public transportation around the world. This has resulted in high power demands on the electrical grid, especially when fast and ultra-fast or flash (at the bus-stop) charging are required. Consequently, a ground storage should be used in order to mitigate the peak power request period. This paper deals with an innovative and simple fast charging infrastructure based on supercapacitors, used to charge the energy storage system on board electric buses. According to the charging level of the electric bus, the proposed fast charging system is able to provide the maximum power of 180 kW without exceeding 30 s and without using DC–DC converters. In order to limit the maximum charging current, the electric bus is charged in three steps through three different connectors placed between the supercapacitors on board the bus and the fast charging system. The fast charging system has been carefully designed, taking into account several system parameters, such as charging time, maximum current, and voltage. Experimental tests have been performed on a fast charging station prototype to validate the theoretical analysis and functionality of the proposed architecture.

scholarly journals Research on Local Government Governance and Enterprise Social Responsibility Behaviors under the Perspective of Cournot Duopoly Competition: Analyzing Taxi Companies and Online Car-Hailing Service Companies

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Xintao Li ◽  
Zaisheng Zhang
Keyword(s):  
Local Government ◽  
Local Governments ◽  
Dynamic Game ◽  
Regulatory System ◽  
Cost Savings ◽  
Service Companies ◽  
Regulatory Policies ◽  
Governance Model ◽  
Dynamic Game Model ◽  
The Cost

Clarifying the rational choice strategy of local governments and enterprises is crucial for promoting control on the failure of taxis and online car-hailing service companies to fulfill their social responsibilities. The local government can reduce the negative externalities and irresponsibility of such companies by improving the regulatory system; thus, it is important to build a governance model that bridges tradition and modernity. This paper, on the basis of summarizing the achievements of the predecessors, builds a mixed dynamic game model among the local government, online car-hailing service companies, and taxi companies; analyzes the relationship between local government preference, execution, and governance of irresponsible enterprise behaviors; and analyzes the equilibrium solution between local government and duopoly enterprises behavior game deeply. The results show that the key to governance irresponsible companies is to make the punishment cost higher than the cost savings for irresponsible behaviors; no matter what the preference of the local government no-governance of online car-hailing service companies’ irresponsible behaviors may persist; and local government ambivalence when regulating irresponsible companies is derived from the complex relationship between social benefits and company interests. Finally, through the analysis of the equilibrium results for the above model, this paper provides suggestions on regulatory policies so as to provide theoretical support and a decision-making basis for establishing scientific, universal, and feasible governance policies and offering responsible methods of urban transportation.

scholarly journals Sustainable Electric Personal Mobility: The Design of a Wireless Charging Infrastructure for Urban Tourism

2021 ◽  
Vol 13 (3) ◽  
pp. 1270
Author(s):  
Sung Il Kwag ◽  
Uhjin Hur ◽  
Young Dae Ko
Keyword(s):  
Public Transportation ◽  
New Technologies ◽  
Point Of View ◽  
Urban Tourism ◽  
Electric Mobility ◽  
Wireless Charging ◽  
Efficient Design ◽  
Personal Mobility ◽  
Charging Infrastructure ◽  
Mobility System

Though new technologies have been applied in all industries, electric mobility technology using eco-friendly energy is drawing a great deal of attention. This research focuses on a personal electric mobility system for urban tourism. Some tourism sites such as Gyeongju, Korea, have broad spaces for tourists to walk around, but the public transportation system has been insufficiently developed due to economic reasons. Therefore, personal mobility technology such as electric scooters can be regarded as efficient alternatives. For the operation of electric scooters, a charging infrastructure is necessary. Generally, scooters can be charged via wires, but this research suggests an advanced electric personal mobility system based on wireless electric charging technology that can accommodate user convenience. A mathematical model-based optimization was adopted to derive an efficient design for a wireless charging infrastructure while minimizing total investment costs. By considering the type of tourists and their tour features, optimal locations and lengths of the static and dynamic wireless charging infrastructure are derived. By referring to this research, urban tourism can handle transportation issues from a sustainable point of view. Moreover, urban tourism will have a better chance of attracting tourists by conserving heritage sites and by facilitating outdoor activities with electric personal mobility.

scholarly journals Modular Approach to Ultra-fast Charging Stations

2021 ◽  
Author(s):  
Carola Leone ◽  
Michela Longo
Keyword(s):  
Impact Analysis ◽  
Road Transport ◽  
Modular Approach ◽  
Long Distance ◽  
Charging Infrastructure ◽  
Charging Station ◽  
Fast Charging ◽  
Modular Architectures ◽  
The Impact ◽  
Fast Charging Station

AbstractRoad transport electrification is essential for meeting the European Union's goals of decarbonization and climate change. In this context, an Ultra-Fast Charging (UFC) system is deemed necessary to facilitate the massive penetration of Electric Vehicles (EVs) on the market; particularly as medium-long distance travels are concerned. Anyway, an ultra-fast charging infrastructure represents the most critical point as regards hardware technology, grid-related issues, and financial sustainability. Thus far, this paper presents an impact analysis of a fast-charging station on the grid in terms of power consumption, obtained by the Monte Carlo simulation. Simulation results show that it is not economical convenient size the assumed ultra-fast charging station for the maximum possible power also considering its high impact on the grid. In view of the results obtained from the impact analysis, the last part of the paper focuses on finding a method to reduce the power installed for the DC/DC stage while keeping the possibility for the electric vehicle to charge at their maximum power. To achieve this goal a modular approach is proposed. Finally, two different modular architectures are presented and compared. In both the solutions, the probability of having EVs charging at limited power is less than 5%.

Design of a cable-stayed footbridge adaptable to various urban areas

2019 ◽  
Author(s):  
Franco Clerici ◽  
Silvia Mirabella
Keyword(s):  
Public Transportation ◽  
Urban Areas ◽  
Local Governments ◽  
Open Spaces ◽  
Limited Space ◽  
Reduced Mobility

<p>The present paper relates to the design of a cable-stayed footbridge, composed by ready made elements and with span suitable to various urban and building areas. At present, in order to find a solution to traffic problems, local governments look for many ways to alleviate city’s main roads, increasing public transportation and designing dedicated underground pedestrian routes. Although this subways already built are not really used by pedestrians, which prefer wide-open spaces, such as skyways also designed for people with reduced mobility. In this context the described footbridge, with access ramps designed in accordance with accessibility standards, represents not only a good solution for cycle and pedestrian mobility problems, but it is also easy to transport and to be installed, due to its modular elements. The access ramps are suspended to pilons with inclination depending by the required bridge lengths and they can be assembled in different configurations in order to be well integrated also in limited space areas. Finally a particular focus is dedicated to cables, with dismountable end terminations designed to reduce transportation space and costs</p>

scholarly journals A Dynamic Game Model of Collective Choice in Multiagent Systems

2018 ◽  
Vol 63 (3) ◽  
pp. 768-782 ◽  
Author(s):  
Rabih Salhab ◽  
Roland P. Malhame ◽  
Jerome Le Ny
Keyword(s):  
Multiagent Systems ◽  
Dynamic Game ◽  
Collective Choice ◽  
Game Model ◽  
Dynamic Game Model

scholarly journals Determining Equipment Capacity of Electric Vehicle Charging Station Operator for Profit Maximization

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2301 ◽  
Author(s):  
Se Baik ◽  
Young Jin ◽  
Yong Yoon
Keyword(s):  
Capital Investment ◽  
Storage System ◽  
Profit Maximization ◽  
Energy Storage System ◽  
Auxiliary Equipment ◽  
Charging Infrastructure ◽  
Physical Constraints ◽  
Charging Station ◽  
Study Results ◽  
Ev Charging

Related to global efforts to reduce greenhouse gases, numerous electric vehicles (EVs) are expected to be integrated to the power grid. However, the introduction of EVs, particularly in Korea, is still marginal due to the lack of EV charging infrastructure, even though various supportive policies exist. To address this shortage of EV charging stations, the EV charging business needs to be profitable. As with any business, the profitability of the EV charging business is significantly affected by the initial capital investment related to EV chargers and auxiliary equipment such as power conditioning system (PCS), battery energy storage system (BESS), and on-site photovoltaic (PV) generation system. Thus, we propose a formulation to determine the number of EV chargers and the capacity of auxiliary equipment with the objective of a charging station operator (CSO) maximizing profit under regulatory, economic, and physical constraints. The effectiveness of the proposed method is verified with simulations considering various EV charging patterns. The study results will help improve the EV charging infrastructure by encouraging individuals and companies to participate in EV charging business.

scholarly journals A Comparative Study of Customer Perceptions of Urban and Rural Bed and Breakfasts in Beijing: An Analysis of Online Reviews

2021 ◽  
Vol 13 (20) ◽  
pp. 11303
Author(s):  
Xin Zhang ◽  
Jiaming Liu ◽  
He Zhu ◽  
Zongcai Huang ◽  
Shuying Zhang ◽  
...  
Keyword(s):  
Sustainable Development ◽  
Comparative Study ◽  
Public Transportation ◽  
Local Governments ◽  
Service Design ◽  
Online Reviews ◽  
Influential Factor ◽  
The Sustainable Development ◽  
Customer Perceptions ◽  
Design Style

The differences between urban and rural B&Bs should be emphasized, which is critical for the sustainable development of the B&B industry. This study identified and compared the topics that customers were concerned about for urban and rural B&Bs in Beijing by analyzing 13,241 online reviews obtained from the website Ctrip. The results showed that customers focused on 10 common topics: “room”, “location”, “host”, “experience”, “surroundings”, “facilities”, “service”, “design/style”, “value”, and “entertainment”. However, the importance of each topic varied between urban and rural B&Bs. Customers paid more attention to the room. Urban B&B customers were more concerned about location. The convenience of urban B&Bs was more prominent than that of rural B&Bs, especially in terms of public transportation and commercial services. While rural B&B customers were more concerned about experience, service, design/style, and entertainment. In addition, the “host” is the most crucial and influential factor in the development of B&Bs. This study made contributions to customer perceptions of B&Bs from a comparative perspective and enriched the understanding of the characteristics of urban and rural B&Bs. In the part of practice, this study might provide enlightenment for B&B operators and local governments to take measures for B&Bs sustainable development.

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