Influence Mechanism and Suppression Control of the MMC on Short-Circuit Current Under AC Faults

Yang, Jian; Mao, Shurui; Li, Xiaodong; Xu, Zheng

doi:10.1109/access.2020.3012149

Cited by 11 publications

(8 citation statements)

References 21 publications

(27 reference statements)

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“…For the hybrid AC–DC transmission system under the AC fault close to bus B1 in Figure 1, the converters close to the generator are subjected to a markedly reduced AC voltage. The power electronic switching devices are then blocked, forcing the DC active power of the HVDC system to be zero [24]. The active power of the generator is close to zero since the voltage at bus B1 is close to zero.…”

Section: Analytical Model For Transient Stability Assessment Of Hybri...mentioning

confidence: 99%

Equal‐area criterion and analytical model for transient stability assessment of hybrid AC–DC transmission system using voltage sourced converter

Wang

Kuschke

Strunz

2022

IET Renewable Power Gen

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An analytical model for transient stability assessment of hybrid AC–DC transmission systems is formulated, implemented, and validated. The equal‐area criterion, as known from the transient stability analysis of AC power systems, is redeveloped for AC–DC power systems using high‐voltage direct current (HVDC) transmission based on the voltage sourced converter and in particular the modular multilevel converter (MMC). Through the proposed analytical solution, the critical clearing angle and the critical clearing time are obtained through symbolic calculations for the most severe DC and AC short‐circuit faults. The assumptions made to enable the formulation of the analytical solution are conservative with respect to the assessment of transient stability. Since the analytical solution is a function of main system parameters and prefault active power flows, it offers an answer to an entire set of problems. It so yields a direct method of transient stability assessment that provides an in‐depth and educational insight into the parameters influencing transient stability. As an illustrative application, the impact of scheduled power flows on DC versus AC lines on the transient stability is analysed. In the performed validation involving the comparison with a computationally more expensive numerical solution, the assumptions underlying the analytic solution were justified.

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Section: Analytical Model For Transient Stability Assessment Of Hybri...mentioning

confidence: 99%

Equal‐area criterion and analytical model for transient stability assessment of hybrid AC–DC transmission system using voltage sourced converter

Wang

Kuschke

Strunz

2022

IET Renewable Power Gen

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“…The authors in [8] analysed the phase-to-ground fault that occurring on the 110 kV and 220 kV lines that interconnect electrical substations used in electric traction. The authors in [9][10][11] analysed the possibilities of limiting the values of the phase-to-ground fault current so as to not exceed the breaking current value of the 500 kV circuit breakers, when the fault occurred on the 500 kV busbar of the electrical substation. The advantages of the symmetrical components method were highlighted, and the results obtained were verified by numerical simulation using the PSCAD (power systems computer-aided design)/EMTDC (electromagnetic transients including DC) software.…”

Section: Introductionmentioning

confidence: 99%

Mathematical Models of the Phase Voltages of High-, Medium- and Low-Voltage Busbars in a Substation during a Phase-to-Ground Fault on High-Voltage Busbars

Toader

Vintan

2023

Mathematics

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The electrical energy supply of industrial equipment is provided by electrical power stations with high- (HT), medium- (MV) and low-voltage (LV) busbars. Consumers are connected to either MV or LV busbars. In this paper, a real power station was considered, through which the gasoline extraction from the well gas installation is powered. Electric consumers (electric motors) supplied by a MV busbar have active power of 13.54 MW, and those fed by a LV busbar have active power of 6.4 MW. Since electrical consumers operate in explosive environments, the design and operating conditions are more severe than in the case of electrical installations operating in non-explosive environments. The case of a single phase-to-ground fault occurring on the HV transmission lines feeding the power station has been analysed. First, the mathematical models for the calculation of the phase voltages, the dissymmetry and asymmetry coefficients, the reduction coefficient of the plus sequence component, and the effective values of the phase voltages were established. The influence of the source impedance (the equivalent impedance of the HV transmission lines) and of the neutral point configuration of the HV/MV medium-voltage transformer on the calculated quantities was analysed. Then, the results obtained using the established mathematical models were compared with those obtained experimentally by provoking a single-phase-to-ground fault near the HV busbars of the real power station. This study has shown that the de-symmetrisation of the phase voltages of the MV and LV busbars is lower when using the Y/Δ connection for the HV/MV transformer. As a result, it is recommended the Y/Δ connection be used for this transformer, instead of the Y0/Δ connection.

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“…With the advantages of asynchronous interconnection, AC fault isolation, rapid control of active and reactive power and no commutation failure risk, voltage sourced converter (VSC)-HVDC transmission not only effectively copes with the current difficulties of AC transmission but also becomes the research focus of electric power industry (Zhang et al, 2010;Guan and Xu, 2012;Ahmed et al, 2012;Yang et al, 2012;Debnath et al, 2015). However, with the significant increase of the scale of direct current (DC) project operation, the impact of VSC-HVDC system on the short-circuit current in AC system is also deepening, and its contribution to the short-circuit current cannot be ignored (Tang et al, 2018;Jiang-Hafner et al, 2002;Yang et al, 2020). The short-circuit current evaluation is one of the significant contents of power system analysis and the basis of power system planning and design, relay protection setting calculation, electrical equipment selection and verification (Jia et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Analysis of the influence factors of VSC–HVDC on AC three-phase short-circuit current level

Zhao

Yan

Sun

2022

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Purpose This paper aims to clarify voltage sourced converter’s (VSC’s) influence rules on the alternating current (AC) short-circuit current and identify the key factors, so as to propose the short-circuit current suppression strategy. Design/methodology/approach This paper investigates the key factors which impact the short-circuit current supplied by the VSC based on the equivalent current source model. This study shows that the phase of the VSC equivalent current source is mainly affected by the type of fault, whereas the amplitude is mainly decided by the control mode, the amplitude limiter and the electrical distance. Based on the above influence mechanism, the dynamic limiter with short-circuit current limiting function is designed. The theoretical analysis is verified by simulations on PSCAD. Findings The short-circuit current feeding from VSC is closely related to the control mode and control parameters of the VSC, fault type at AC side and the electrical distance of the fault point. The proposed dynamic limiter can make VSC absorb more reactive power to suppress the short-circuit current. Research limitations/implications The dynamic limiter proposed in this paper is limited to suppress three-phase short-circuit fault current. The future work will focus more on improving and extending the dynamic limiter to the fault current suppression application in other fault scenarios. Practical implications The research results provide a reference for the design of protection system. Originality/value The key influence factors are conducive to put forward the measures to suppress the fault current, eliminate the risk of short-circuit current exceeding the standard and reduce the difficulty of protection design.

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Influence Mechanism and Suppression Control of the MMC on Short-Circuit Current Under AC Faults

Cited by 11 publications

References 21 publications

Equal‐area criterion and analytical model for transient stability assessment of hybrid AC–DC transmission system using voltage sourced converter

Equal‐area criterion and analytical model for transient stability assessment of hybrid AC–DC transmission system using voltage sourced converter

Mathematical Models of the Phase Voltages of High-, Medium- and Low-Voltage Busbars in a Substation during a Phase-to-Ground Fault on High-Voltage Busbars

Analysis of the influence factors of VSC–HVDC on AC three-phase short-circuit current level

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