METHOD AND A SYSTEM FOR A FAST BUS TRANSFER IN AN ELECTRICAL POWER SYSTEM

摘要

A method for synchronizing and connecting a first sub power system with a second sub power system with an intelligent electronic device (IED) by use of at least one switching device between the first sub power system and the second sub power system in an electrical power system is provided. The TED monitors power supply parameters such as voltage magnitude, phase and other derived parameters such as voltage and phase differences in the first sub power system and the second sub power system to identify at least one instance for fast bus transfer where the two sub systems have acceptable differences in magnitude and phase. The TED performs phase shifting and voltage magnitude correction in anticipation for synchronizing power supplies on connection at the identified instance.

主权项

1. A method for synchronizing and connecting a first sub power system with a second sub power system with an intelligent electronic device (IED) by use of at least one switching device between the first sub power system and the second sub power system in an electrical power system, wherein the second subsystem includes a voltage decaying in magnitude and frequency at a first rate of change, the method be implemented on the IED and comprising:
a) monitoring power supply parameters for the first sub power system and the second sub power system; b) identifying at least one instance for operating the at least one switching device using the monitored power supply parameters, and selecting one instance to connect the first sub power system and the second sub power system, wherein identifying at least one instance includes predicting magnitudes of phase angle difference and voltage difference between the first sub power system and the second sub power system, based on measured signal values of the power supply parameters and the first rate of change; c) performing phase shifting and/or voltage magnitude correction in the electrical power system in anticipation for synchronizing power supplies on connection of the first sub power system with the second sub power system at the selected one instance; and d) operating the switching device to connect the first sub power system and the second sub power system in the electrical power system at the selected one instance; e) wherein performing of the phase shifting and voltage magnitude correction in anticipation for synchronizing power supplies on connection of the first sub power system with the second sub power system at the selected one instance includes cross switching of one or more phases in the electrical power system.