Back-to-back PV generation system for electrified railway and its control strategy

MingLiang, Wu; WeiYing, Wang; Wenli, Deng; Huabo, Chen; Chao-hua, Dai; Weirong, Chen

doi:10.1109/itec-ap.2017.8080799

Cited by 5 publications

References 3 publications

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“…The number of percentage scheduling for each option can be calculated by Equation (21), where n si corresponds to the number of days operated in the i th scheduling option. Then, the amount of energy required to operate those schedules can be calculated by Equation (22), where E si is the energy requirement of the i th scheduling option and the number of scheduling options is m. The energy generated by the photovoltaic system for the considered period is calculated by Equation (23) where the energy generation in the i th day is E day,i . Finally, Equation (24) presents the percentage of effective net-zero emissions (NZE eff ).…”

Section: Performance Analysis With Scheduling Based On Dailymentioning

confidence: 99%

“…In all five cases presented, photovoltaic systems are integrated into high-voltage AC systems or medium-voltage AC railway electrification systems at the substation. A back-to-back converter structure for a 25 kV ac railway electrification system is proposed in [23] to integrate a photovoltaic system. The concept of an MVDC structure for a railway electrification system connecting wind and solar systems, cities, HVDC systems, and an AC grid is presented in [24].…”

Section: Introductionmentioning

confidence: 99%

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Sizing Algorithm for a Photovoltaic System along an Urban Railway Network towards Net Zero Emission

Binduhewa¹

2021

International Journal of Photoenergy

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A reliable transportation system is essential for the development of a community. Especially in urban transportation, rail transportation is a faster, more comfortable way to travel for the commuters. These benefits can be valued further when the rail transportation system is with zero emissions. Electric trains can be considered a zero-emission transportation method. However, a rail transportation system operates with net-zero emissions when electricity is generated from zero-emission-based sources. Photovoltaic systems have already been integrated into railway stations and spare land owned by railways to achieve net-zero emissions. Furthermore, medium-voltage DC network and microgrid concepts have been proposed to incorporate more renewable energy sources into railway electrification systems. However, the energy generated from those systems is not enough to realise net-zero emissions, as the power requirements of an urban railway electrification system are high. Accordingly, this article investigates the possibility of implementing a photovoltaic system along the railway tracks to meet the energy demands of an urban railway electrification system so that net-zero emissions can be achieved. Other significant advantages of the proposed photovoltaic system are lower feeder losses due to distributed photovoltaic systems integrated into the railway electrification system, lower conversion losses due to the direct integration of the photovoltaic system into the railway electrification system, and the nonrequirement of additional space to install the photovoltaic system. In this paper, a photovoltaic system capacity sizing algorithm is proposed and presented by considering a railway electrification system, the daily schedule of trains, and historical photovoltaic weather data. This proposed photovoltaic system capacity sizing algorithm was evaluated considering a section of the urban railway network of Sri Lanka and a three-year, 2017-2020, photovoltaic weather data. The results indicated that the potential for photovoltaic generation by installing photovoltaic systems along a railway track is much higher than the requirement, and it is possible to meet the required train scheduling options with proper sizing. Furthermore, in the three-year analysis, it is possible to achieve 90% of the energy required for the railway electrification system with effective train scheduling methods.

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Section: Performance Analysis With Scheduling Based On Dailymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sizing Algorithm for a Photovoltaic System along an Urban Railway Network towards Net Zero Emission

Binduhewa¹

2021

International Journal of Photoenergy

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“…Different configurations to integrate renewable energies into TPSS are compared in terms of control performance and economic benefits in [17]. In [18], a single‐phase back‐to‐back PV generation system and associated control scheme are proposed. In this topology, the back‐to‐back converter can transfer PV energy to the traction network and dynamically adjust its output current according to the real‐time traction loads, so as to achieve active power balance and reactive power compensation.…”

Section: Introductionmentioning

confidence: 99%

Novel double‐layer DC/AC railway traction power supply system with renewable integration

Li²,

Zhang

2020

IET Renewable Power Generation

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Back-to-back converter based railway traction power supply system (TPSS) can eliminate neutral sections in the traction side and improve power quality in the grid side, but it still has some drawbacks such as low reliability, difficulty in accepting largecapacity renewable energy, and power mismatches. In this paper, a double-layer DC/AC TPSS with renewable integration is proposed to address these challenges and to improve system performance. The proposed topology breaks the limit of back-toback structure and enables more flexible free energy flow. A top-down system design method is proposed in this paper. Firstly, the characteristics of the proposed TPSS for integration with renewable power are described and compared with the traditional back-to-back topology. Secondly, a DC droop controller and a AC droop controller are designed for DC layer grid and AC layer grid respectively to control the power flow in each layer. The traditional AC droop control is based on the inductive transmission impedance, but the resistance of traction transmission line cannot be ignored. Thus a modified droop control strategy with the consideration of line resistance is also proposed in this paper. Subsequently, the voltage control strategy for the single MMC converter is designed to track the reference signal from the upper droop controller. Finally, a general double-layer DC/AC TPSS is designed from bottom to top, and the simulation results confirm that the proposed TPSS with renewable integration is capable of delivering desirable performance.

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Back-to-back PV generation system for electrified railway and its control strategy

Cited by 5 publications

References 3 publications

Sizing Algorithm for a Photovoltaic System along an Urban Railway Network towards Net Zero Emission

Sizing Algorithm for a Photovoltaic System along an Urban Railway Network towards Net Zero Emission

Novel double‐layer DC/AC railway traction power supply system with renewable integration

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