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• W2184933719 abstract "SUMMARY Meshing in multi-terminal HVDC networks raises the need for HVDC circuit breakers to prevent a fault from affecting the whole network. The challenge in DC interruption lays in the absence of current zero crossings, as only at small currents the switching arc can be extinguished efficiently. We aim to optimize HVDC arc chambers for effective generation of current zero crossings by the principle of passive resonance and find design criteria for future HVDC circuit breakers. Passive resonance requires certain arcing conditions and an LC- commutation path in parallel to the arcing chamber. Arcs with strongly negative gradient dVD/dID at high currents and small time constant τ are optimal to show passive resonance. In black box modelling of Schwarz [3], the arc is described by the energy balance equation and the parameter functions power loss PS and time constant τS. The typically in literature assumed simple exponential dependency of PS and τS from the conductance g limits the achievable modelling accuracy strongly. If the assumption is not made, the determination of the parameter functions is very challenging and connected to significant measurement effort which is difficult to achieve with existing test equipment consisting of LC-resonant circuits. The main drawback of such sources is the coupling of the current gradient dID/dt and the current ID due to the sinusoidal current wave forms and the effort in change of hardware components to modify the current waveform. In this paper an unipolar arbitrary current source (UnACuSo) based on semiconductors is presented that enables generation of complex current waveforms. The current shape and the current gradient can be chosen arbitrary without hardware modifications. UnACuSo is based on a combination of a multi-level Marx type converter (M3TC) and an interleaved 3 level converter system. Practical current waveforms are proposed, to efficiently and exactly determine the arc parameter functions PS and τS. The waveforms combine sections of stationary DC current (optimal for PS determination) with various gradients (required for exact τS evaluation). Additional current waveforms are suggested to prove the existence of a stationary arc characteristics and to distinguish if a conductance gradient dependency τS(g,dg/dt) of the arc time constant exists. This would require adaptions in the modelling approach of Schwarz." @default.
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• W2184933719 date "2012-01-01" @default.
• W2184933719 modified "2023-09-22" @default.
• W2184933719 title "A new Method for Investigating the Arc Behaviour in HVDC Circuit Breakers based on a novel Current Source" @default.
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