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For Medium Voltage DC (MVDC) power systems, we greatly extend the coverage of local-information-based fault protection (LIFP), an approach defined for independent distributed management of short-circuit line-to-line faults that does not rely on any high-speed ship-wide communications, to arc faults under varying load conditions. The method for LIFP was previously developed for systems where all loads...
We define an approach Local Information Based Fault Protection (LIFP) for robust protection against short-circuit faults that does not rely on microgrid-wide communications. Using a monopolar bus as an example, we show how each entity connected to the dc bus, including current-limiting power converters and non-load-breaking disconnect switches, can autonomously detect, identify, and appropriately...
Robust management of short-circuit faults in MVDC systems must rely on a combination of communication-dependent and communication-independent methods. In one approach, an MVDC system is designed to operate without breakers [1], so both methods rely on coordinated control of power converters and non-fault-breaking mechanical disconnect switches to effect the fault clearance process-fault detection...
Apparent resistance can be used by each power distribution element — supply converters and power circuit contactors — to identify and respond to faults in multi-terminal dc power systems. Each element can take appropriate independent action based on its own local measurements: Supply converters can go into current limiting or shut-down modes and (non-fault breaking) contactors can segment and/or reconfigure...
Traditional synchronizer cannot control multiple generators in distribution networks in coordination. In this paper, a real-time synchronization control (RTSC) is designed to keep all generators in different standalone distribution networks in synchronization at all times, which realizes a fast and reliable reconnection of disconnected power network. The frequency control and phase control in RTSC...
With the capacity expansion of power systems, fault currents may exceed the interrupting capacity ratings of circuit breakers (CBs). Inductive fault current limiters (FCLs) are able to effectively limit fault currents and maintain circuit breakers on duty. For power systems of different ratings, it is important to decide whether the parameters of an inductive FCL satisfy the requirement of limiting...
We report conceptual design and analysis of a supercapacitor-based voltage support system for a 13.8 KV AC power system. The power source has been designed to ride through a 2s voltage sag caused either by high load demand or remote system fault. The simulation model currently supports study of both power injection and power absorption. Response of the SC storage to a line fault has also been studied...
Conventional braking resistor (BR) method employing a fixed insertion period does not work well to stabilize the wind generator system for different types of faults. This paper proposes a closed-loop control strategy of the braking resistor based on thyristor technology to stabilize the wind generator system. The performance of the proposed braking resistor is evaluated in detail considering both...
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