A Novel DC Fault Ride-Through Scheme for MTDC Networks Connecting Large-Scale Wind Parks

Sanusi, Wasiu; Hosani, Mohamed Al; Moursi, Mohamed Shawky El

doi:10.1109/tste.2017.2651025

Cited by 42 publications

(29 citation statements)

References 23 publications

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“…The converter overcurrent protection threshold is dependent on the converter design and a value of 2 p.u. is typical over which the converters need to be blocked to avoid damage [20][21][22]. With the current limit set at 1.3 p.u.…”

Section: B Fast Fault Current Providing Controlmentioning

confidence: 99%

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Offshore AC Fault Protection of Diode Rectifier Unit-Based HVdc System for Wind Energy Transmission

2019

IEEE Trans. Ind. Electron.

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Offshore AC fault protection of wind turbines (WTs) connecting with diode rectifier unit based HVDC (DRU-HVDC) system is investigated in this paper. A voltage-error-dependent fault current injection is proposed to regulate the WT current during offshore AC fault transients and quickly provide fault current for fault detection. Considering different fault locations, the fault characteristics during symmetrical and asymmetrical faults are presented and the requirements for fault detection are addressed. A simple and effective offshore AC fault protection solution, combining both overcurrent protection and differential protection, is proposed by utilizing the developed fast fault current providing control. To improve system availability, reduced DC voltage of the DRU-HVDC system is investigated, where one of the series-connected DRUs is disconnected and the onshore modular multilevel converter (MMC) actively reduces DC voltage to resume wind power transmission. The proposed scheme is robust to various offshore AC faults and can automatically restore normal operation. Simulation results confirm the proposed fault protection strategy. Index Terms-diode rectifier unit based HVDC (DRU-HVDC), fault protection, HVDC transmission, offshore wind farm, symmetrical and asymmetrical AC faults.

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Section: B Fast Fault Current Providing Controlmentioning

confidence: 99%

“…As described in Section III B, to avoid converter damage, the overcurrent protection threshold is typically set at 2 p.u. over which the converters need to be blocked [20][21][22]32]. In the proposed scheme, the converter currents are controllable during various faults and are limited to 1.3 p.u.…”

Section: Offshore Ac Fault Protectionmentioning

confidence: 99%

Offshore AC Fault Protection of Diode Rectifier Unit-Based HVdc System for Wind Energy Transmission

2019

IEEE Trans. Ind. Electron.

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“…Reference [15] used two thyristors in parallel with the sub-modules to realize fault clearance and automatic recovery, but the converter must be blocked for a long time when reclosing a permanent fault. Reference [16] used series braking resistance (SBR) cooperating with a high-temperature superconducting FCL to reduce the fault currents during reclosing, but it did not illustrate how to select the parameter of the SBR. A soft reclosing model (SRM) is proposed in Reference [17] to limit the reclosing over-current of VSC-MTDC.…”

Section: Introductionmentioning

confidence: 99%

A Novel Overcurrent Suppression Strategy during Reclosing Process of MMC-HVDC

Jiang

Gong

2019

Applied Sciences

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A modular multilevel converter based high-voltage DC (MMC-HVDC) system has been the most promising topology for HVDC. A reclosing scheme is usually configured because temporary faults often occur on transmission lines especially when overhead lines are used, which often brings about an overcurrent problem. In this paper, a new fault current limiter (FCL) based on reclosing current limiting resistance (RCLR) is proposed to solve the overcurrent problem during the reclosing process. Firstly, a mesh current method (MCM) based short-circuit current calculation method is newly proposed to solve the fault current calculation of a loop MMC-HVDC grid. Then the method to calculate the RCLR is proposed based on the arm current to limit the arm currents to a specified value during the reclosing process. Finally, a three-terminal loop MMC-HVDC test grid is constructed in the widely used electromagnetic transient simulation software PSCAD/EMTDC and the simulations prove the effectiveness of the proposed strategy.

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“…As one of the most promising renewable energy resources to be used in the world, wind energy has attracted the attention of many researchers [1][2][3][4]. With the fast development of power electronics, the fully-rated permanent magnet synchronous generator (PMSG) and partially-rated doubly-fed induction generator (DFIG)-based wind energy conversion systems (WECSs) are the ones mainly used in the wind energy market, since they have the ability of variable-speed constant-frequency (VSCF) operation.…”

Section: Introductionmentioning

confidence: 99%

Sensorless Control of Late-Stage Offshore DFIG-WT with FSTP Converters by Using EKF to Ride through Hybrid Faults

et al. 2017

Energies

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Abstract:A hybrid fault scenario in a late-stage offshore doubly-fed induction generator (DFIG)-based wind turbine (DFIG-WT) with converter open-circuit fault and position sensor failure is investigated in this paper. An extended Kalman filter (EKF)-based sensorless control strategy is utilized to eliminate the encoder. Based on the detailed analysis of the seventh-order dynamic state space model of DFIG, along with the input voltage signals and measured current signals, the EKF algorithm for DFIG is designed to estimate the rotor speed and position. In addition, the bridge arm open circuit in the back-to-back (BTB) power converter of DFIG is taken as a commonly-encountered fault due to the fragility of semiconductor switches. Four-switch three-phase (FSTP) topology-based fault-tolerant converters are employed for post-fault operation by considering the minimization of switching losses and reducing the circuit complexity. Moreover, a simplified space vector pulse width modulation (SVPWM) technique is proposed to reduce the computational burden, and a voltage balancing scheme is put forward to increase the DC-bus voltage utilization rate. Simulation studies are carried out in MATLAB/Simulink2017a (MathWorks, Natick, MA, USA) to demonstrate the validity of the proposed hybrid fault-tolerant strategy for DFIG-WT, with the wind speed fluctuation, measurement noises and grid voltage sag taken into consideration.

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A Novel DC Fault Ride-Through Scheme for MTDC Networks Connecting Large-Scale Wind Parks

Cited by 42 publications

References 23 publications

Offshore AC Fault Protection of Diode Rectifier Unit-Based HVdc System for Wind Energy Transmission

Offshore AC Fault Protection of Diode Rectifier Unit-Based HVdc System for Wind Energy Transmission

A Novel Overcurrent Suppression Strategy during Reclosing Process of MMC-HVDC

Sensorless Control of Late-Stage Offshore DFIG-WT with FSTP Converters by Using EKF to Ride through Hybrid Faults

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