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High Accurate Synchronized Data Acquisition from distributed sources through modular devices

IP.com Disclosure Number: IPCOM000194940D
Publication Date: 2010-Apr-14
Document File: 5 page(s) / 56K

Publishing Venue

The IP.com Prior Art Database

Related People

S Senthil Kumar: ATTORNEY

Abstract

The IEDs (Intelligent Electronic Devices) performing power system functions must communicate the data between them and be synchronized with each other for proper operation of system. The synchronization is achieved using various methods at present leading to ± 1µs accuracy. The accuracy of synchronized data acquisition from distributed data source can be affected by the jitter in the synchronization signal, but the accuracy can be improved if the data acquisition module for multiple data source is present in a single physical device. For example the modular Merging Unit (MU) with extendable Analog Input Modules (AIM) can be used to sample the voltage and current information from different points in the power system. In this case, the synchronized sampling pulse for such AIMs comes from a single source i.,e HECM( High end Communication module) resulting in higher accuracy of synchronization .

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High Accurate Synchronized Data Acquisition from distributed sources through modular devices

Authors- Sasi Sr Kumar, Vivek Gopalakrishnan, Tobias Gentzell, Krister Landernas and Lennart Balgard

1.      Abstract

The IEDs (Intelligent Electronic Devices) performing power system functions must communicate the data between them  and be synchronized with each other for proper operation of system. The synchronization is achieved using various methods at present leading to ± 1µs accuracy. The accuracy of synchronized data acquisition from distributed data source can be affected by the jitter in the synchronization signal, but the accuracy can be improved if the data acquisition module for multiple data source is present in a single physical device. For example the modular Merging Unit (MU) with extendable Analog Input Modules (AIM) can be used to sample the voltage and current information from different points in the power system. In this case, the synchronized sampling pulse for such AIMs comes from a single source i.,e HECM( High end Communication module) resulting in higher accuracy of synchronization .

The MU can be assembled with multiple AIMs, each interfaced with different instrument transformers. The MU can be configured to generate the concurrent upstream messages using multiple logical devices based on the number of such AIMs so that the receiving IED sees the (IEC 61850-9-2) messages as though it is originating from different MUs. With this method the number of MU involved to achieve some specific power system applications can be reduced besides achieving higher accuracy of synchronization for synchronously acquiring the data from different points in the power system.

2.      Background

            The power system involves one or more IEDs in its various stages for performing   protection, control, metering and monitoring functionalities. These IEDs must   acquire the voltage and current data from various points of the power system and         exchange the data between them for proper functioning of power system. Few             applications are based on either current or voltage alone. For example differential   protection is based on only currents measured at different sides of the protected            objects. Typically 3 phase currents have to be transmitted from each measurement   point. Similarly Synchrono-Check and Synchronization Application is based on             the voltage measured at different sides of the circuit breaker. Typically 3 phase      voltages have to be transmitted from either side of the circuit breaker.

 

            The IEDs for differential protection and synchronization application in the             Substation Automation System (SAS) are supplied with the current and voltage       data respectively by either hardwiring the IED with the instrument transformer or       through Merging Units (MU) supplying the digitized data of...