BFS algorithm for voltage-constrained meshed DC traction networks with nonsmooth voltage-dependent loads and generators

Arboleya, Pablo; Belaid, Mohamed; González-Morán, Cristina; El‐Sayed, Islam

doi:10.1109/pesgm.2017.8273774

Cited by 7 publications

(8 citation statements)

References 17 publications

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“…where M denotes train mass in kt, G is the gravity constant of about 9.8N/kg, and µ p and σ p are the mean and the deviation of unit train power, respectively. The field test data obtained on an EMU has been analyzed to verify (5). The probability histogram is drawn in Fig.…”

Section: Active Power Analysis For a Single Train A Probability mentioning

confidence: 99%

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Stochastic Process and Simulation of Traction Load for High Speed Railways

2019

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The traction load of a high-speed railway (HSR) may cause significant voltage fluctuations in the traction power supply system and the utility grid. To evaluate power quality, modeling traction load is an urgent need as well as a fundamental work. This paper aims to build a probabilistic model to describe the pattern of traction load changing with time. It is very challenging due to the randomness of train behavior. This paper first investigates the stochastic process of traction load and points out that the size and frequency of load fluctuation, respectively, rely on the slope and length of the rail ramp. Based on this, train power (TP) and headway (TH) are set as two basic components of the probabilistic model, where TP and TH are described by a normal distribution and an exponential distribution, respectively. In addition, a sliding time-window method is developed for generating time-dependent load samples. The proposed method has low complexity, as well as can consider the randomness, giving more realistic simulation results. It can be used to forecast traction load for a planning railway or to establish a measurement-based model for an operating railway. A case study is performed for parameter identification and model verification, and the rapid voltage change (RVC) caused by the HSR loads has been evaluated in different operation scenarios. INDEX TERMS Dynamic headway, high-speed railway (HSR), probabilistic model, rapid voltage change (RVC), traction load.

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Section: Active Power Analysis For a Single Train A Probability mentioning

confidence: 99%

“…Table 1 gives the settings. The weights in (15c), w i , i ∈ [1,5], are shown in Table 2. With Intel Core i7-6700 CPU @3.4-GHz and 8-GB of RAM, the program can find an optimal solution in 30 min.…”

Section: Case Study a Parameter Identificationmentioning

confidence: 99%

Stochastic Process and Simulation of Traction Load for High Speed Railways

2019

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“…Additionally, classical protective relays installed in the TES could have a maximum rate‐of‐rise threshold, and a tripping signal is sent to the circuit breaker when the current rate of rise exceeds a defined value 5,6 . However, due to the similarity between short‐circuit current and oscillating current, DDL protection is not sufficient and the rate‐of‐rise protection of more recent relays is quite difficult to be properly set in order to avoid nuisance tripping 7 . In Reference 8, passive damping stabilization schemes have been proposed for achieving the suppression of the oscillating current.…”

Section: Introductionmentioning

confidence: 99%

A new scheme to identify the special load current waveform for a Metro DC traction system

Tian

Sun

Ning

et al. 2020

Int Trans Electr Energ Syst

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Summary This paper studies the identification of special load current in a Metro DC traction system. Because of the widespread application of variable voltage variable frequency (VVVF) used by electric vehicles and regenerative braking technology with energy feedback, the DC traction power system becomes a second‐order nonlinear dynamic system, whose structure may become unstable during the regenerative braking of vehicles. Divergent low‐frequency oscillation current often appears in DC traction system. Engineering practice proves that the divergent oscillation current belongs to abnormal load current with short duration, and it is not a fault current, but its amplitude and slope are similar to the terminal short‐circuit current, which is easy to cause DDL nuisance tripping. This shows that the di/dt and ΔI protection (DDL protection) principle needs to be further improved and optimized. In order to identify the short‐circuit of a traction electrification system (TES) quickly and accurately, a compensation algorithm is proposed by the correlation dimension of chaos theory. The correlation dimension can reflect the dynamic change of the differential current signal of TES quickly and sensitively, which can effectively identify short‐circuit and special load current. Real‐time simulation and fault measurement based on closed‐loop system show the effectiveness of the method, which can be used as the compensation algorithm for the feeder protection algorithm of the DC traction system to improve the safety and reliability of Metro DC feeder protection.

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“…There are also methods that use direct approach in solving power flow problems like [26] where bus injection to bus current (BIBC) and branch current to bus voltage (BCBV) matrices have been developed from topological structure of the network and the final solution is achieved by combining these two matrices. Another direct approach described in [27] is applied on weakly meshed DC traction networks. The problem is formulated using standard node incidence matrix (IM) combining it with Kirchhoff's laws and creating non‐iterative Core BFS Algorithm (C‐BFS).…”

Section: Introductionmentioning

confidence: 99%