Model Analysis and Sliding Mode Current Controller for Multilevel Railway Power Conditioner Under the V/v Traction System

Ma, Fujun; Zhen, Zaili; Min, Jun; Yue, Yufei; He, Xianxian

doi:10.1109/tpel.2018.2835570

Cited by 24 publications

(13 citation statements)

References 33 publications

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“…When the regenerative braking power in a certain power supply sector needs to be transferred and the adjacent power supply sectors on both sides are in the state of power consumption, the utilization rate of the RBE can be improved regardless of which side the RBE is transmitted to. However, the unbalanced three-phase current in the TS input side would cause a great threat to the safe operation of the utility grid [12,30,31]. The main reason is the power difference between two power supply sectors in the same TS.…”

Section: Algorithm Principlementioning

confidence: 99%

“…, 2n−1), the active power of the right side of the ETC l is −ηp l ; when p l < 0, the active power of the right side of the ETC l is − p l /η. However, the unbalanced three-phase current in the TS input side would cause a great threat to the safe operation of the utility grid [12,30,31]. The main reason is the power difference between two power supply sectors in the same TS.…”

Section: Algorithm Stepsmentioning

confidence: 99%

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An Optimized Regulation Scheme of Improving the Effective Utilization of the Regenerative Braking Energy of the Whole Railway Line

Gao

et al. 2019

Energies

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With respect to the problems of great impact on the utility grid, the increasing catenary voltage, the limited utilization rate of the regenerative braking energy (RBE) and the irreducible cost of electricity for locomotives caused by the RBE generated by electric locomotives of the whole railway line cannot be fully utilized in traction power supply systems. An energy management system (EMS) integrating electrical energy and information is proposed in this paper. A corresponding optimization algorithm is also proposed to calculate the distribution of the regenerative braking power in the whole railway line. The structure and working principle of the EMS are introduced. The basic principle and detailed steps of the proposed algorithm are given. Finally, the optimization calculation and simulation are carried out, the effectiveness and feasibility of the proposed EMS and the optimization algorithm are verified.

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Section: Algorithm Principlementioning

confidence: 99%

Section: Algorithm Stepsmentioning

confidence: 99%

An Optimized Regulation Scheme of Improving the Effective Utilization of the Regenerative Braking Energy of the Whole Railway Line

Gao

et al. 2019

Energies

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“…At present, there are two main ways to obtain the MMC‐HVDC impedance model: the synchronous rotating coordinate system (dq) modeling 10 and the three‐phase (abc) modeling 11 . The impedance model in the dq coordinate system is built in the rotating coordinate system.…”

Section: Introductionmentioning

confidence: 99%

MMC‐HVDC system oscillation suppression control strategy based on state feedback decoupling control

Yang

Cheng

Zhang

et al. 2020

Int Trans Electr Energ Syst

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Summary Background: Subsynchronous oscillation (SSO) of wind farm integration through modular multi‐level converter‐based high voltage direct current (MMC‐HVDC) transmission system puts forward high requirements for the robustness of MMC control strategy and parameters, which is the key problem to be solved in SSO suppression. This paper proposes a method to suppress the oscillation in wind farm integration through modular multi‐level converter‐based high voltage direct current (MMC‐HVDC) transmission system. The proposed method is developed in two main steps. First, the mathematical model is established between the sequence impedance of wind farm integration through MMC‐HVDC transmission system and their controller parameters, the influence of parameters on the sequence impedance characteristics is also studied. Second, the hierarchical control strategy is proposed and the MMC double closed‐loop control system is established. The operating modes of MMC are considered in analyzing characteristics via the Fortescue approach, and exploit the hierarchical control to alleviate negative effects of transient data samples on the oscillation suppression. The influences of different system disturbances, the sensitivity of control parameters, and different MMC operating conditions are evaluated. The results verify the correctness of the MMC‐HVDC mathematical model and the effectiveness of the modular design of the control strategy.

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“…A railway traction power conditioner (RTPC) based on MMC is proposed to reduce three-phase unbalance for the high-speed railway system [22]. Similarly, a multilevel railway power conditioner (RPC) is proposed in [23], and a sliding mode current controller is also designed. In recent years, many MMC based RPCs have been proposed for power balancing.…”

Section: Introductionmentioning

confidence: 99%

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

Zhang

et al. 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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Model Analysis and Sliding Mode Current Controller for Multilevel Railway Power Conditioner Under the V/v Traction System

Cited by 24 publications

References 33 publications

An Optimized Regulation Scheme of Improving the Effective Utilization of the Regenerative Braking Energy of the Whole Railway Line

An Optimized Regulation Scheme of Improving the Effective Utilization of the Regenerative Braking Energy of the Whole Railway Line

MMC‐HVDC system oscillation suppression control strategy based on state feedback decoupling control

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

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