Application of a Novel Superconducting Fault Current Limiter in a VSC-HVDC System

Zhang, Lihui; Shi, Jing; Wang, Zuoshuai; Tang, Yuejin; Yang, Zhihui; Yan, Sinian; Liao, Yun

doi:10.1109/tasc.2017.2656634

Cited by 31 publications

(22 citation statements)

References 7 publications

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“…Superconducting fault current limiters have been studied in VSC-HVDC systems [31][32][33][34][35][36][37]. A novel SFCL with both a superconducting coil and a resistance is presented for limiting rapidly growing current in VSC-HVDC systems during severe disturbances [32]. A DC protection scheme of multiterminal VSC-HVDC with resistive type SFCL was presented [34].…”

mentioning

confidence: 99%

Fault Ride-through Capability Enhancement of Voltage Source Converter-High Voltage Direct Current Systems with Bridge Type Fault Current Limiters

Alam

Abido

2017

Energies

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This paper proposes the use of bridge type fault current limiters (BFCLs) as a potential solution to reduce the impact of fault disturbance on voltage source converter-based high voltage DC (VSC-HVDC) systems. Since VSC-HVDC systems are vulnerable to faults, it is essential to enhance the fault ride-through (FRT) capability with auxiliary control devices like BFCLs. BFCL controllers have been developed to limit the fault current during the inception of system disturbances. Real and reactive power controllers for the VSC-HVDC have been developed based on current control mode. DC link voltage control has been achieved by a feedback mechanism such that net power exchange with DC link capacitor is zero. A grid-connected VSC-HVDC system and a wind farm integrated VSC-HVDC system along with the proposed BFCL and associated controllers have been implemented in a real time digital simulator (RTDS). Symmetrical three phase as well as different types of unsymmetrical faults have been applied in the systems in order to show the effectiveness of the proposed BFCL solution. DC link voltage fluctuation, machine speed and active power oscillation have been greatly suppressed with the proposed BFCL. Another significant feature of this work is that the performance of the proposed BFCL in VSC-HVDC systems is compared to that of series dynamic braking resistor (SDBR). Comparative results show that the proposed BFCL is superior over SDBR in limiting fault current as well as improving system fault ride through (FRT) capability.Moreover, VSC-HVDC offers a solution for many problems faced nowadays by power networks such as network congestion, grid reinforcement, multi-terminal DC (MTDC) operation and asynchronous operations of two different grids [10]. Different types of VSC topologies are proposed in the literature [11,12] including two level, three level and multilevel converters for HVDC transmission. Multilevel means more than two voltage levels can be achieved in one phase leg, which reduces the switching times of valve and makes the voltage wave form closer to a sinusoidal curve. Line to neutral voltage waveforms of both two-level and three-level converters with PWM are discussed and compared in [12].However, despite the numerous advantages, VSC-HVDC systems face difficulties in dealing with different grid faults [13]. Fault ride-through (FRT) capability enhancement is one of the main requirements for wind farm-integrated VSC-HVDC systems [14,15]. During system faults, bulk power interruptions must be avoided by keeping the HVDC system energized, otherwise, the system may face serious instability due to this bulk power interruption. Modular multilevel converter-based VSC-HVDC system topologies can provide enhanced fault ride-through capability [16]. In [17,18] FRT capability as well as transient stability improvement have been reported by applying various VSC control techniques. A power synchronization control technique has been proposed in [19] with coordination between wind turbines and HVDC controllers in order to achieve FRT ...

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mentioning

confidence: 99%

Fault Ride-through Capability Enhancement of Voltage Source Converter-High Voltage Direct Current Systems with Bridge Type Fault Current Limiters

Alam

Abido

2017

Energies

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“…There are novel topologies of SFCL which are exploited to anticipate dc faults for large-rated dc connections within very short time and with reduced current surges [23]. This chapter will consider the resistive SFCL type, which is already applied to a wide range of electrical equipment; however, it is still an immature technology in LVRT hardware of wind turbines [24].…”

Section: Modelling and Integration Of Supplementary Controlsmentioning

confidence: 99%

“…The SFCL has not been practically deployed as a LVRT hardware in the wind power industry. However, it has a promising potential, mainly that it showed merit when it is applied in the protection of distribution networks [23].…”

Section: Key Control Featuresmentioning

confidence: 99%

Provision of Ancillary Services by Wind Power Generators

Attya¹,

Domínguez‐García²

2020

Advances in Modelling and Control of Wind and Hydrogenerators

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The current and future power systems foresee very deep penetration of renewable power plants into the generation mix, which will make the provision of ancillary services by renewables an ultimate necessity. This would be further emphasised when green power stations replace conventional power plants that rely on fossil fuels. In this context, many control methodologies could be applied to the controllers of the green generators to enable the provision of these services, mainly frequency support and voltage regulation. Most of the available models (i.e. in power system simulators) do not include such supplementary controls to provide ancillary services. Hence, this chapter exploits key examples of these controllers that proved to be efficient and widely accepted. In addition, this chapter considers their integration into the conventional controls of green generators, where the focus is on wind energy.

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“…However, despite several potential benefits, VSC-HVDC systems are more defenceless against AC/DC faults than LCC-HVDC systems. Upon the occurrence of short circuit faults, the level of fault current surges tenfold within several milliseconds feeding very high fault currents into the DC cables through the freewheel diode which may cause severe damage to the voltage source converters [8][9][10][11]. Currently, analysis and isolation of DC faults on VSC-based DC systems has attracted the interest of numerous researchers [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…To date, VSC-HVDC system stability has been examined with the implementation of different categories of superconducting FCLs (SFCLs) [1,9,31,32]. However, superconducting fault current limiters have several drawbacks such as big size, heavy weight and cost, magnetic field interference with nearby sensitive devices, higher leakage and circulating currents, long recovery time, and loss in stand-by mode [33][34][35][36][37][38][39][40] compared to non-superconducting fault current limiters.…”

Section: Introductionmentioning

confidence: 99%

Non-Linear Control for Variable Resistive Bridge Type Fault Current Limiter in AC-DC Systems

2019

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This paper proposes a non-linear control-based variable resistive bridge type fault current limiter (VR-BFCL) as a prospective solution to ease the effect of disturbances on voltage source converter-based high voltage DC (VSC-HVDC) systems. A non-linear controller for VR-BFCL has been developed to insert a variable optimum resistance during the inception of system disturbances in order to limit the fault current. The non-linear controller takes the amount of DC link voltage deviation as its input and provides variable duty to generate a variable effective resistance during faults. The VSC-HVDC system’s real and reactive power controllers have been developed based on a current control loop where direct axis and quadrature axis currents are used to control the active and reactive power, respectively. The efficacy of the proposed non-linear control-based VR-BFCL solution has been proved with balanced as well as unbalanced faults. The results confirm that the oscillations in active power and DC link voltage have been significantly reduced by limiting the fault current through the insertion of an optimum effective resistance with the proposed control technique. The real time digital simulator (RTDS) has been used to implement the proposed approach. The performance of the proposed non-linear control based VR-BFCL is compared with that of traditional fixed duty control.

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Application of a Novel Superconducting Fault Current Limiter in a VSC-HVDC System

Cited by 31 publications

References 7 publications

Fault Ride-through Capability Enhancement of Voltage Source Converter-High Voltage Direct Current Systems with Bridge Type Fault Current Limiters

Fault Ride-through Capability Enhancement of Voltage Source Converter-High Voltage Direct Current Systems with Bridge Type Fault Current Limiters

Provision of Ancillary Services by Wind Power Generators

Non-Linear Control for Variable Resistive Bridge Type Fault Current Limiter in AC-DC Systems

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