Application of multilevel full bridge converters in HVDC multiterminal systems

Petino, Cora; Heidemann, Matthias; Eichhoff, Daniel; Stumpe, Maximilian; Spahic, E.; Schettler, F.

doi:10.1049/iet-pel.2015.0515

Cited by 46 publications

(31 citation statements)

References 10 publications

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“…The second approach is to use MMCs having FB or clampdouble (CD) SMs plus FDs. This type of MMCs can effectively regulate dc fault current to a low magnitude by reversing the dc voltage while keep providing reactive power support to the connected ac systems [23], [38]. The FDs at the faulty circuit can then isolate the dc fault.…”

Section: B Different Approaches For Protecting Hvdc Gridsmentioning

confidence: 99%

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Coordination of MMCs With Hybrid DC Circuit Breakers for HVDC Grid Protection

Wang

Adeuyi

et al. 2019

IEEE Trans. Power Delivery

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A high-voltage direct-current (HVDC) grid protection strategy to suppress dc fault currents and prevent overcurrent in the arms of modular multilevel converters (MMCs) is proposed in this paper. The strategy is based on the coordination of half-bridge MMCs and hybrid dc circuit breakers (DCCBs). This is achieved by allowing MMC submodules to be temporarily bypassed prior to the opening of the DCCBs. Once the fault is isolated by the DCCBs, the MMCs will restore to normal operation. The performance of the proposed method is assessed and compared to when MMCs are blocked and when no corrective action is taken. To achieve this, an algorithm for fault detection and discrimination is used and its impact on MMC bypassing is discussed. To assess its effectiveness, the proposed algorithm is demonstrated in PSCAD/EMTDC using a four-terminal HVDC system. Simulation results show that the coordination of MMCs and DCCBs can significantly reduce dc fault current and the absorbed current energy by more than 70% and 90%, respectively, while keeping MMC arm currents small.

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Section: B Different Approaches For Protecting Hvdc Gridsmentioning

confidence: 99%

“…MMCs with full-bridge (FB) SMs may be blocked to prevent the discharge of SM capacitors and to interrupt the fault current contributed by a connected ac system [22], [23]. However, such topologies have a larger number of semi-conductor devices and are subjected to higher conduction losses than half-bridge (HB) MMCs.…”

Section: Introductionmentioning

confidence: 99%

Coordination of MMCs With Hybrid DC Circuit Breakers for HVDC Grid Protection

Wang

Adeuyi

et al. 2019

IEEE Trans. Power Delivery

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“…It cannot detect fault which has resistance higher than 100 X. In [31], application of multilevel full bridge converters in HVDC multiterminal systems has been proposed. Therefore, reliability and selectivity of the system depends on all the parameters.…”

Section: Introductionmentioning

confidence: 99%

Fault analysis method of integrated high voltage direct current transmission lines for onshore wind farm

Agarwal

Swetapadma

Panigrahi

et al. 2018

J. Mod. Power Syst. Clean Energy

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Voltage source converter (VSC) based high voltage direct current (HVDC) transmission is most suited for the wind farm as it allows flexibility for reactive power control in multi-terminal transmission lines and transmits low power over smaller distance. In this work, a novel method has been proposed to detect the fault, identify the section of faults and classify the pole of the fault in DC transmission lines fed from onshore wind farm. In the proposed scheme, voltage signal from rectifier end terminal is extracted with sampling frequency of 1 kHz given as input to the detection, classification and section discrimination module. In this work, severe AC faults are also considered for section discrimination. Proposed method uses fuzzy inference system (FIS) to carry out all relaying task. The reach setting of the relay is 99.9% of the transmission line. Besides, the protection covers and discriminates the grounding fault with fault resistance up to 300 X. Considering the results of the proposed method it can be used effectively in real power network.

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“…However, DC fault and its effective handling have been identified as one of the most serious challenges in the implementation of VSC-type DC transmission systems [11,12]. The impact of DC fault location on fault interruption time and maximum fault current magnitude has not been considered previously [13,14]. The search for the best MMC topology, control schemes, protection devices, and the combination of all or some of these factors, considering the nature of the DC fault, is the subject of this paper.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Appropriate MMC Topology Considering DC Fault Handling Performance of Fault Protection Devices

et al. 2018

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The eventual goal of high-voltage direct-voltage (HVDC) systems is to implement HVDC grids. The modular multilevel converter (MMC) has been identified as the best candidate for the realization of an HVDC grid by eliminating the shortcomings of conventional voltage source converter (VSC) technology. The related research has focused on efficient control schemes, new MMC topologies, and operational characteristics of an MMC in a DC grid, but there is little understanding about the fault handling capability of two mainstream MMC topologies, i.e., half bridge (HB) and full bridge (FB) MMCs in combination with an adequate protection device. Contrary to the existing research where the fault location is usually fixed (center of the line), this paper considered a variable fault location on the DC line, so as to compare the fault interruption time and maximum fault current magnitude. From the point of view of fault interruption, AC and DC side transient analyses were performed for both MMC topologies to suggest the appropriate topology. The simulation result confirmed that the fault handling performance of an HB-MMC with a DC circuit breaker is superior due to the smaller fault current magnitude, faster interruption time, lower overvoltage magnitude, and lesser stresses on the insulation of the DC grid.

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Application of multilevel full bridge converters in HVDC multiterminal systems

Cited by 46 publications

References 10 publications

Coordination of MMCs With Hybrid DC Circuit Breakers for HVDC Grid Protection

Coordination of MMCs With Hybrid DC Circuit Breakers for HVDC Grid Protection

Fault analysis method of integrated high voltage direct current transmission lines for onshore wind farm

Assessment of Appropriate MMC Topology Considering DC Fault Handling Performance of Fault Protection Devices

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