Control of DC-Fault-Resilient Voltage Source Converter Based HVDC Transmission System under DC Fault Operating Condition

Yousefpoor, Nima; Narwal, Ajit; Bhattacharya, Subhashish

doi:10.1109/tie.2014.2371431

Cited by 37 publications

(22 citation statements)

References 11 publications

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“…Besides, the DC grid is composed of second-order RLC circuits. Therefore, the voltage oscillates to Vunf on the basis of the pre-fault value Vdc and theoretically the overvoltage peak is about 3Vdc if no losses are taken into account, as shown in (37). Moreover, the time for the peak mainly depends on the time constant of the system.…”

Section: Figure 16 Voltages Calculated By the Proposed Methods And Pscadmentioning

confidence: 99%

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An Equivalent Calculation Method for Pole-to-Ground Fault Transient Characteristics of Symmetrical Monopolar MMC Based DC Grid

Zhang

et al. 2020

IEEE Access

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The pole-to-ground fault is one of the most typical faults in modular multilevel converters (MMCs) based DC grid. Analyzing the transient characteristics of fault voltages and currents is of great significance for fault identification, configuration of protection, and optimization of system parameters. This paper proposes an equivalent transient characteristics calculation method for pole-to-ground faults for symmetrical monopolar MMC based DC grid. Firstly, according to the mechanism of the pole-to-ground faults, the fault network and the steady-state network are formed. Then, the star-delta transformation is performed on modelling the MMCs in the fault network, which overcomes the problem that the number of the inserted sub-modules (SMs) in each arm is time-variant. Based on the discrete adjoint model, the prefault and faulted matrices describing the voltages and currents are established, and a general method for solving the transient voltages and currents is proposed. Finally, the proposed method is validated in a fourterminal symmetrical monopolar MMC based DC grid. The results show that the proposed method is of high accuracy, and is much more time efficient than time-domain simulation. INDEX TERMS Modular multilevel converter (MMC), symmetrical monopolar, DC grid, pole-to-ground fault, discrete adjoint model, voltage and current characteristics

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Section: Figure 16 Voltages Calculated By the Proposed Methods And Pscadmentioning

confidence: 99%

“…A cascaded π-type section approximation of a transmission line is shown as bellows. Usually, the lumped parameter model of one π-type section has high accuracy for transient calculation [35][36][37], which is also adopted in this paper. The discrete adjoint model of one π-type section of the DC line is shown in Fig.…”

Section: Sm1mentioning

confidence: 99%

An Equivalent Calculation Method for Pole-to-Ground Fault Transient Characteristics of Symmetrical Monopolar MMC Based DC Grid

Zhang

et al. 2020

IEEE Access

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“…The overhead lines' failure rate will be much higher than dc cables. In this paper, we take overhead lines as an example, and overhead lines can be represented to simplified R-L series models [33]- [35].…”

Section: Theoretical Analysis and Design Considerationsmentioning

confidence: 99%

Research on a Novel DC Circuit Breaker Based on Artificial Current Zero-Crossing

2020

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Modular multilevel converter-based high voltage direct-current (MMC-HVDC) transmission has developed rapidly because of its flexibility, reliability and efficiency. DC circuit breaker (DCCB) is one of the key equipments to ensure the safe and stable operation of MMC-HVDC power grids. In this paper, we investigate a novel topology of DC circuit breaker based on artificial current zero-crossing. The proposed DC circuit breaker can effectively limit the magnitude and rise rate of fault current at the converter station side and reduce the impact of DC fault on the converter devices. The principle and operation sequence of this topology are described. Meanwhile, the breaking process of the DC fault is analyzed theoretically and the considerations for parameter design are presented. Finally, the system model of DC circuit breaker and a four-terminal MMC-HVDC test system are built in PSCAD/EMTDC. The simulation results show that the proposed DC circuit breaker is effective for quick breaking after fault. INDEX TERMS DC circuit breaker, novel topology, artificial current zero-crossing, short circuit fault, bidirectional current breaking, MMC-HVDC.

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“…On the other hand, for grid side onshore of VSC station 2, the active power of 300MW is received during the full operation of the system, but reduced during the fault occurrence from t = 1.8 s to t = 1.85 s. From t = 1.85s to t = 2s, the system recovers its dynamics quickly and start receiving 300MW power from offshore VSC station 1. The results obtained by the proposed algorithm are compared to the results obtained in [13] and [18] for threephase fault at onshore AC main grid, and in [24] and [25] for three-phase fault at offshore grid side, and in [24] and [31] for DC link fault. These comparisons are illustrated in the table II, III and IV given in the appendix.…”

Section: Scenario Iii: DC Faultmentioning

confidence: 99%

Adaptive Sensorless Control of PMSGs-Based Offshore Wind Farm and VSC-HVdc Stations

Benadja

Chandra

2015

IEEE J. Emerg. Sel. Topics Power Electron.

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Control of DC-Fault-Resilient Voltage Source Converter Based HVDC Transmission System under DC Fault Operating Condition

Cited by 37 publications

References 11 publications

An Equivalent Calculation Method for Pole-to-Ground Fault Transient Characteristics of Symmetrical Monopolar MMC Based DC Grid

An Equivalent Calculation Method for Pole-to-Ground Fault Transient Characteristics of Symmetrical Monopolar MMC Based DC Grid

Research on a Novel DC Circuit Breaker Based on Artificial Current Zero-Crossing

Adaptive Sensorless Control of PMSGs-Based Offshore Wind Farm and VSC-HVdc Stations

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