FACTS: powerful means for dynamic load balancing and voltage support of AC traction feeders

Grünbaum, Rolf; Hasler, Jean-Philippe; Thorvaldsson, B.

doi:10.1109/ptc.2001.964806

Cited by 15 publications

(8 citation statements)

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“…Energies 2019, 12, x FOR PEER REVIEW 6 of 16 [ ] In Equation 17, setting n = 1 produces the fundamental component H (1), which consists of the DC-link voltage V dc and three switching angles, θ 1 -θ 3 . The fundamental component H(1) is used for the reactive power regulation.…”

Section: Dstatcom Main Circuitmentioning

confidence: 99%

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Development of an SDBC-MMCC-Based DSTATCOM for Real-Time Single-Phase Load Compensation in Three-Phase Power Distribution Systems

Chang

Liao

2019

Energies

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This paper proposes a newly developed single-delta bridge-cell, modular multilevel cascade converter (SDBC-MMCC)-based distribution-level static synchronous compensator (DSTATCOM) for single-phase load compensation in three-phase, three-wire electric power distribution systems. Each main circuit arm of the DSTATCOM uses a modular multilevel cascade converter based on full-H-bridge (FHB) cells. The three main DSTATCOM arms are delta-connected to allow phase-independent operations for phase balancing and unity power factor correction of the single-phase load in three-phase, three-wire electric power distribution systems. By using the symmetrical components method, a feedforward compensation algorithm was employed for the DSTATCOM. A simulation of the DSTATCOM was performed for functioning verification. Finally, a hardware test system was built by using a multi-DSP-based control system. The test results verified the effectiveness of the proposed SDBC-MMCC-based DSTATCOM in single-phase load compensation.

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Section: Dstatcom Main Circuitmentioning

confidence: 99%

“…Moreover, the unbalanced current will disturb the normal operation of an electric power generator. To keep good power quality, the unbalanced current from the single-phase load should be improved [1,2].…”

Section: Introductionmentioning

confidence: 99%

Development of an SDBC-MMCC-Based DSTATCOM for Real-Time Single-Phase Load Compensation in Three-Phase Power Distribution Systems

Chang

Liao

2019

Energies

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“…Nowadays, the power range of the traction load is very large i.e. 50-100 MW pet feeding transformer [19].…”

Section: Traction Loadmentioning

confidence: 99%

Balancing asymmetrical load using a static var compensator

Alsulami

Bongiorno

Srivastava

et al. 2014

IEEE PES Innovative Smart Grid Technologies, Europe

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In practical power systems, it is normally impossible to maintain perfect balance or symmetry in phase voltages and currents. The diversity of the load, such as single phase, arc furnaces and railway, enhances the amount of unbalance or negative sequence components. Alongside asymmetrical load, further increase in negative sequence components is introduced due to the network inherent asymmetry i.e. untransposed transmission. Thus, they are usually excessive and exceeds standards at weak nodes in the network. Utilities and customers have to comply certain code agreements to limit the degree of negative sequence components in the network. This is because that negative sequence components cause deterioration to the network equipments. For instance, higher loss, torque oscillation, speed reduction and excessive rotor heat are undesirable obstacles to rotating machines. Asymmetrical load compensator can be based on passive elements, i.e. inductors and capacitors such as a Static Var Compensator (SVC), or a Voltage Source Converter (VSC) such as a Static Synchronous Compensator (STATCOM). The utilization of the negative sequence controller, an SVC or a STATCOM provides, gains a significant interest to most utilities around the globe. The compensators basically inject a different capacitive or inductive negative sequence current that has an opposite phase of the load negative sequence current. As a result, the network see symmetrical load and phase voltages and currents are balanced without exchanging active power between the network and the compensator. I would like to thank the management team Lars Stendius and Toni Blomkvist for their initial support during the summer internship and the master thesis work proposal. The financial support of this thesis was from ABB, Saudi Arabia. My acknowledgement goes to the Training Manger Awad Al-Enazy and the HR Manger Zeid Al-Rumaihi for giving me the opportunity to complete my master degree in Sweden. A special thanks is to the Talent Management Officer Mohammed Metwalli for his frequent support during the master degree. I would like to thank my family and friends in Saudi Arabia, Sweden and USA for giving me the motivation all the time. Last but not least, my greatest gratitude is to my father Meshal Alsulami (R.I.P). You will always be remembered.

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“…technologies have been introduced in the AC traction power system to improve the power quality and balance the load [2][3]. Shunt compensating devices such as the static VAR compensator (SVC) and static synchronous compensator (STATCOM) have been investigated to reduce voltage fluctuation and to improve the power factor [4][5].…”

Section: Introductionmentioning

confidence: 99%

A Phase-shifter for Regulating Circulating Power Flow in a Parallel-feeding AC Traction Power System

Choi¹

2014

Journal of Electrical Engineering and Technology

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-A parallel-feeding AC traction power system increases the power supply capacity and decreases voltage fluctuations, but the circulating power flow caused by the phase difference between the traction substations prevents the system from being widely used. A circuit analysis shows that the circulating power flow increases almost linearly as the phase difference increases, which adds extra load to the system and results in increased power dissipation and load unbalance. In this paper, we suggest a phase shifter for the parallel-feeding AC traction power system. The phase shifter regulates the phase difference and the circulating power flow by injecting quadrature voltage which can be obtained directly from the Scott-connection transformer in the traction substation. A case study involving the phase shifter applied to the traction power system of a Korean high-speed rail system shows that a three-level phase shifter can prevent circulating power flow while the phase difference between substations increases up to 12 degrees, mitigate the load unbalance, and reduce power dissipation.

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FACTS: powerful means for dynamic load balancing and voltage support of AC traction feeders

Cited by 15 publications

References 0 publications

Development of an SDBC-MMCC-Based DSTATCOM for Real-Time Single-Phase Load Compensation in Three-Phase Power Distribution Systems

Development of an SDBC-MMCC-Based DSTATCOM for Real-Time Single-Phase Load Compensation in Three-Phase Power Distribution Systems

Balancing asymmetrical load using a static var compensator

A Phase-shifter for Regulating Circulating Power Flow in a Parallel-feeding AC Traction Power System

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