Traction power supply system of China high-speed railway under low-carbon target: Form evolution and operation control

Li, Xin; Zhu, Chengkun; Liu, Yingzhi

doi:10.1016/j.epsr.2023.109682

Cited by 8 publications

(6 citation statements)

References 73 publications

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“…This model encompasses three components: internal impedance, geometrical impedance, and an earth correction term. The geometrical term can be described by equations ( 7) through (11), which apply the catenary geometry as shown in Fig. 4.…”

Section: F the Multi-conductor Modelmentioning

confidence: 99%

“…In modern railway power supply systems, upon the arrival of trains at the TPSS, unbalanced loads and frequency deviations are inevitable. Therefore, the need for more intelligent, flexible, and intricate systems to accommodate the dynamic nature of railway operations [11]. Several studies propose various methods to incorporate frequency control in railway systems.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing Grid Stability Using a Virtual Inertia-Integrated Railway Power Conditioner in Railway Power Supplies With High Renewable Energy Penetration

Phophongviwat,

Boonlert,

Hongesombut

2024

IEEE Access

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As electric power systems increasingly integrate Renewable Energy Sources (RESs), the consequent reduction in system inertia has heightened their sensitivity to disturbances, such as sudden load changes. This issue is especially relevant in railway power supply systems, which are evolving to be dominated by RESs. Traditional solutions, including Railway Power Conditioners (RPCs), primarily address unbalanced loads and reactive power compensation but offer limited frequency support. This paper introduces a Virtual Inertia-Integrated Railway Power Conditioner (VIIRPC), a novel solution that enhances traditional RPCs with Energy Storage Systems (ESS) to provide critical virtual inertia support, thereby addressing the critical gap in frequency stability amidst the evolving energy landscape of railway systems. Utilizing a current source-based model, the VIIRPC effectively extends inertia support from two-phase systems to balanced three-phase systems at the Point of Common Coupling (PCC). This achievement is realized by dividing a virtual inertia signal and integrating it into both sides of the RPC control loop, while respecting each side's signal orientation. Simulations have been conducted to verify the operation under different loading conditions, including a 4-minute headway train schedule, under both conventional and low-inertia grid conditions. These results demonstrate that the VIIRPC outperforms traditional RPCs by enhancing frequency stability and maintaining conventional functionalities. This advancement is particularly significant for modern, RES-dominated railway power supplies, especially in remote areas with RES-based power sources and low short-circuit levels at the PCC. INDEX TERMSVirtual inertia control, railway power conditioners, unbalanced power systems, Scott transformers, renewable energy sources NOMENCLATURE A. ABBREVIATIONS arr. Arrive. AT Autotransformers. BI-phase Two-phase systems in PowerFactory. DD mode Autotransformer mode in PowerFactory. dep. * Apparent power conjugate. Te Electrical torque. Tm Mechanical torque. u * Voltage conjugate. Y load Load admittance. z Eii Self-earth impedance. z Eij Mutual earth impedance. z Gii Self-geometrical impedance. z Gij Mutual geometrical impedance. z ii Self-impedance. z ij Mutual impedance. z Lii Internal impedance. µ 0 Vacuum magnetic permeability. ω s The nominal angular speed. ∆f Frequency different. ∆P RPC RPC's transferring active power ∆P VI Virtual inertia power. ∆Q α,out Reactive power injection of the α phase. ∆Q β,out Reactive power injection at the β phase. ∆δ m Rotor angle difference. ∆ω m Angular speed difference. TEERAPHON PHOPHONGVIWAT was born in Kanchanaburi, Thailand. He received the B.Eng. and M.Eng. degrees in electrical engineering from the King Mongkut'

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Section: F the Multi-conductor Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancing Grid Stability Using a Virtual Inertia-Integrated Railway Power Conditioner in Railway Power Supplies With High Renewable Energy Penetration

Phophongviwat,

Boonlert,

Hongesombut

2024

IEEE Access

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“…In the TPSS a V/v connection traction transformer is installed for obtaining the power from the threephase public grid supplying the traction load of the two single-phase catenary sections. A railway power conditioner (RPC) with typical back-to-back topology [26,27], i.e., singlephase ac-dc-ac converter, is employed not only to balance the power between section a and section b but also to provide a dc-link to which a number of renewable energy generation and energy storage units can be connected. The renewable energy generation system is associated with the natural resources endowment along the railway line, e.g., photovoltaic, wind, hydropower, geothermal, tidal, etc.…”

Section: Structurementioning

confidence: 99%

“…Zhao et al proposed a control strategy clarifying the energy distribution relationship between the HESS and traction power supply system under different operation modes [25]. An EMS for ERSMS including PV and ESS has been proposed in [6,26], which enhances the overall economic efficiency of system operations. However, these approaches are restricted to a single renewable energy source or a single ESS or both, so that further research on EMS for ERSMS incorporating multiple renewable energy sources and HESS is required.…”

Section: Introductionmentioning

confidence: 99%

An Energy Management Strategy for an Electrified Railway Smart Microgrid System Based on Integrated Empirical Mode Decomposition

Ye,

Sun,

Song

2024

Energies

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The integration of a renewable energy and hybrid energy storage system (HESS) into electrified railways to build an electric railway smart microgrid system (ERSMS) is beneficial for reducing fossil fuel consumption and minimizing energy waste. However, the fluctuations of renewable energy generation and traction load challenge the effectiveness of the energy management for such a complex system. In this work, an energy management strategy is proposed which firstly decomposes the renewable energy into low-frequency and high-frequency components by an integrated empirical mode decomposition (IEMD). Then, a two-stage energy distribution approach is utilized to appropriately distribute the energy flow in the ERSMS. Finally, the feasibility and effectiveness of the proposed solution are validated through case study.

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“…[12] evaluates the potential of photovoltaics along the Beijing-Shanghai high-speed railway and on train station roofs, with a total power generation capacity of 5.65 GW, significantly reducing the power consumption of trains from the main grid. A 42,000 m 2 photovoltaic power generation system has been installed on the roof of the Xiongan High-speed Railway Station, with a system capacity of 6 MW, which can meet 20% of the high-speed railway's electricity demand and reduce 45 million tons of carbon dioxide emissions annually [13,14]. In addition, other renewable energy sources such as wind and hydropower are also being used for railway transportation [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Multifunctional Superconducting Magnetic Energy Compensation for the Traction Power System of High-Speed Maglevs

Fu,

Chen,

Zhang

et al. 2024

Electronics

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With the global trend of carbon reduction, high-speed maglevs are going to use a large percentage of the electricity generated from renewable energy. However, the fluctuating characteristics of renewable energy can cause voltage disturbance in the traction power system, but high-speed maglevs have high requirements for power quality. This paper presents a novel scheme of a high-speed maglev power system using superconducting magnetic energy storage (SMES) and distributed renewable energy. It aims to solve the voltage sag caused by renewable energy and achieve smooth power interaction between the traction power system and maglevs. The working principle of the SMES power compensation system for topology and the control strategy were analyzed. A maglev train traction power supply model was established, and the results show that SMES effectively alleviated voltage sag, responded rapidly to the power demand during maglev acceleration and braking, and maintained voltage stability. In our case study of a 10 MW high-speed maglev traction power system, the SMES system could output/absorb power to compensate for sudden changes within 10 ms, stabilizing the DC bus voltage with fluctuations of less than 0.8%. Overall, the novel SMES power compensation system is expected to become a promising solution for high-speed maglevs to overcome the power quality issues from renewable energy.

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Traction power supply system of China high-speed railway under low-carbon target: Form evolution and operation control

Cited by 8 publications

References 73 publications

Enhancing Grid Stability Using a Virtual Inertia-Integrated Railway Power Conditioner in Railway Power Supplies With High Renewable Energy Penetration

Enhancing Grid Stability Using a Virtual Inertia-Integrated Railway Power Conditioner in Railway Power Supplies With High Renewable Energy Penetration

An Energy Management Strategy for an Electrified Railway Smart Microgrid System Based on Integrated Empirical Mode Decomposition

Multifunctional Superconducting Magnetic Energy Compensation for the Traction Power System of High-Speed Maglevs

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