Abstract
Fault location on a dc microgrid feeder needs to be extremely fast to protect the circuit breaker and converter-source components. This paper develops a seminal theoretical foundation for fast fault location on a dc feeder that uses only single-ended local measurements in time domain. The theory provides a closed-form deterministic solution for fault location, making the resulting fault location method agnostic to system-topology and immune to fault resistance. The theory is developed with ideal dc voltage sources, and extended to practical converter-sources. The performance of the resulting method is demonstrated by simulating a dc feeder with converters connected at both ends, modeled in PSCAD.
Highlights
As penetration of solar-photovoltaic (PV) and storage grows in distribution systems, the concept of dc microgrids is gaining traction due to lower conversion losses and the inherent ease of operation of dc systems [1]
After the capacitor voltage drops to a critical value, a high fault current starts to flow through the power electronic devices [3], [4], exposing them to damage
This paper develops a deterministic closed-form mathematical model based on the time-domain physical model of a faulted dc feeder, fed from both ends
Summary
As penetration of solar-photovoltaic (PV) and storage grows in distribution systems, the concept of dc microgrids is gaining traction due to lower conversion losses and the inherent ease of operation of dc systems [1]. To overcome these drawbacks this paper develops a deterministic closed-form mathematical formulation that forms the foundation of a single-ended fault location method for a feeder fed from both ends that is immune to fault resistance.
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