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DISTRIBUTION NETWORK TIME SYNCHRONIZATION

IP.com Disclosure Number: IPCOM000222151D
Publication Date: 2012-Sep-20
Document File: 9 page(s) / 445K

Publishing Venue

The IP.com Prior Art Database

Abstract

The present invention discloses a system and method for time synchronized measurements in distribution networks. Specifically, the system for time synchronized measurements in distribution networks comprises a power line communication (PLC) access and distribution network, an injection subsystem, a global positioning system (GPS) subsystem. The PLC access and distribution network comprise an IP or data network, a distribution or medium voltage (MV) network and an access or low voltage (LV) network. The LV network comprises customer premises equipment (CPE) PLC modems, PLC repeaters, a head end (HE) modem and LV power lines. The distribution or MV network comprises MV/LV substations, MV power lines and measurement devices. The system facilitates reception of electrical signals injected by the injection subsystem at the measurement devices in the distribution network at approximately the same instant, thereby leading to usage of the injected electrical signals as a synchronizing signal for calculations of phasor measurements.

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DISTRIBUTION NETWORK TIME SYNCHRONIZATION

BRIEF ABSTRACT

    The present invention discloses a system and method for time synchronized measurements in distribution networks. Specifically, the system for time synchronized measurements in distribution networks comprises a power line communication (PLC) access and distribution network, an injection subsystem, a global positioning system (GPS) subsystem. The PLC access and distribution network comprise an IP or data network, a distribution or medium voltage (MV) network and an access or low voltage (LV) network. The LV network comprises customer premises equipment (CPE) PLC modems, PLC repeaters, a head end (HE) modem and LV power lines. The distribution or MV network comprises MV/LV substations, MV power lines and measurement devices. The system facilitates reception of electrical signals injected by the injection subsystem at the measurement devices in the distribution network at approximately the same instant, thereby leading to usage of the injected electrical signals as a synchronizing signal for calculations of phasor measurements.

KEYWORDS

PLC, distribution network, time synchronization, GPS, Phasor Management Unit, Phasor

DETAILED DESCRIPTION

    Generally, modern power system operators encounter problems related to wide-area system disturbances, which cannot be solved by means of traditional protection and control systems. One solution is implementation of a system for monitoring, management and automation of power systems. For example, in

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modern transmission and distribution networks, management and monitoring issues are usually performed by intelligent electronic devices (IEDs) coupled with suitable communication links.

    Often a majority of control and protection schemes are based on algorithms that are implemented based on the estimated state of the system. The estimated state of the system depends on data measured in strategic points of a network. The data measured in the strategic points of the network plays a critical role considering the implications on safety and economical aspects. At multiple instances, evaluation of timeliness, accuracy and consistency of the estimated state of the system causes problems. One solution to the timeliness problem is to have continuously updated information on the electrical parameters defining the estimated state of the system. However, synchronization between the remote instruments presents a challenge, as data measured in the strategic points of the network are directly comparable. One solution to the problems of accuracy and consistency is implementation of a wide area measurement system (WAMS) capable of acquiring data on the strategic points of the network and to distribute synchronized data on the network. However, synchronization of measurements of the acquired data is not simple given the complexity and dimensions of distributed systems. Further, the synchronization accuracy requirements significantly change depending o...