Abstract
HVDC grids demand the fast and reliable operation of the protection system. The failure of any protection element should initialize a backup protection almost immediately in order to assure the system’s stability. This paper proposes a novel backup strategy that covers the failure of the primary protection including the malfunctioning of the HVDC circuit breaker. Only local voltage measurements are employed in the proposed backup protection and the voltage derivative is calculated at both sides of the limiting inductor. Consequently, the speed and reliability of the protection system are enhanced, since no communication channel is needed. This paper contains a thorough specification of the proposed protection strategy. This strategy is validated in a four-terminal HVDC grid with various fault case scenarios, including high-resistance fault cases. The operation of the backup protection is reliable and remarkably fast.
Highlights
The protection system of HVDC grids must operate in a few milliseconds in order to assure the system’s stability
This paper proposes a novel protection strategy that minimizes the consequences of This paper proposes a novel protection strategy that minimizes the consequences
Taking fault case F1 as an example, this fault should be detected by the primary protection relays R12 and R21; the circuit breaker corresponding to R12 presents
Summary
The protection system of HVDC grids must operate in a few milliseconds in order to assure the system’s stability In consequence, in such a short time span faults must be detected and located by protection relays and cleared by the switching devices. The proposed algorithms detect the CB failure based on thresholds of the voltage and current measurements. The backup protection is assessed in a four-terminal HVDC grid with different location fault case scenarios; it does not consider the fault current measurements. CB failure in order to enhance the performance in addition to the availability of the proof CB failure in order to enhance the performance in addition to the availability of the tection system This strategy is based on a new backup algorithm that considers the malprotection system.
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