technical specification of iec 61850 based communication ... · communication system for...

Technical Specification of IEC 61850 based

Communication System for Distribution Substation

Automation at CFE, MexicoJ. García-Hernández, C. [email protected], [email protected]

Electrical Research InstituteCuernavaca, Mor.

México

A. Villalobos-Romo (CFE-LAPEM), R. E. Llamas-González(CFE-LAPEM), M. Guel-López (CFE-División Golfo Centro),Sierra-Rodríguez (CFE-Gerencia de Normalización)Comisión Federal de Electricidad (CFE)CFE Distribución, México

Contents

Introduction

Main objectives

Used methodology

Substation distribution model

Communication system specification

Conclusions and future work

Introduction: what is CFE?

CFE is a company that provides services of generation,

transmission and distribution of electrical power services to

26.7 million customers.

CFE Distribution

The distribution network is comprised of

Subtransmission lines with voltage levels of 138, 115, 85 and 69

kilovolts (kV).

Distribution lines with levels of 34.5, 23, 13.8, 6.6, 4.16 and 2.4 kV.

23.3 Million Distribution Users

1,551 Distribution Substations

13 Distribution Divisions

CFE´s Distribution divisions

Baja

California

Sureste

Peninsular

Noroeste

Norte

Golfo Norte

Golfo Centro

OrienteBajío

Jalisco

Centro Occidente

Centro Oriente

Centro Sur

CFE´s Distribution divisions

Main objective

To invest in the use of new technologies that in the short or

medium term allow CFE to reduce the engineering and

commissioning time as well as the overall project costs.

One aspect of interest for CFE in the IEC 61850 standard was

the interoperability between IEDs from different vendors, it

claims.

As an initial step, the project required of a technical

specification according to the IEC 61850 standard.

To meet the requirements of CFE´s distribution network

Developing a methodology

Based on a CFE´s distribution substation model

Methodology

Distribution substation model

The model of the distribution substation is based on a system

known as SISCOPROMM (Integrated System for Control,

Protection, Metering and Maintainability).

Defines the design, architecture, technical, functional and

operative functions, as well as quality control functions for the

operation and automation of distribution substations owned by

CFE.

Distribution substation model

Fig. 1 One-line diagram of CFE´s

distribution substation in a ring

configuration.

Logical nodes were proposed by using the free allocation of

functions to IEDs.

Logical nodes

Common Data Classes were built by making use of IEC 61850´s

templates.

Common data classes (CDC)

Data exchange between logical nodes was made by using

PICOMS.

Data exchange

The communication system shall meet the design functional

requirements for its correct operation in distribution

substations at CFE, Mexico.

Shall cover the following communication issues required for

the proposed IEC 61850 substation automation system, in

order to perform as an integrated system:

• communication network• architecture • network topology • transmission mediums • fault tolerant topologies • network redundancy • self-healing scheme • fault recovery time• communication profiles

• communication services (client-server and peer-to-peer).

• electromagnetic interference immunity• environmental conditions• network management• network performance • reliability• availability• security


Communication Architecture

Support substation automation functions such as: sampled value

exchange for CTs and VTs, fast exchange of data for protection, control

and trip signals, engineering and configuration, monitoring and

supervision, control-center communication, time-synchronisation,

metering, etc.

Consider at least one LAN named station bus, according to the IEC

61850standard. The station bus may be implemented by using a LAN

composed of layer 2/3 managed Ethernet switches, according to the IEC

61850standard.

Consider one or more LAN named process bus, according to the IEC

61850standard. The process bus may be implemented by using optical

fiber point-to-point links (Part 9-1). Also, the process bus may be

implemented by using a LAN composed of layer 2 managed Ethernet

switches (Part 9-2).


Communication Profiles

Seven-layer OSI reference model, TCP/IP model, UDP protocol or Ethernet

protocol depending on the required communication service type.

Mapping of the abstract communication services shall be done by using

the MMS protocol (ISO/IEC 9506-1, ISO/IEC 9506-2).

GOOSE service and sampled values shall be mapped directly to Ethernet

frames or ISO/IEC 8802-3.

SNTP Protocol (RFC 2030) for the time synchronisation of all substation

devices (IEDs, HMI, etc.).


Communication Services

Client-server for ACSI services, peer-to-peer for GOOSE services and

sampled values, and time synchronisation.

Vertical communication for the exchange of information such as

commands, reports, file transfer, etc., between the HMI and bay level IEDs

and vice-versa. Vertical communication shall use the client-server model

based on the MMS protocol over TCP/IP (IEC 61850, Part 8).

Horizontal communication for the transmission and reception of multicast

messages, where one message may be received by multiple IEDs.

Horizontal communication shall use the peer-to-peer service, according to

the IEC 61850 standard, Parts 8 (GOOSE), 9-1 and 9-2 (sampled values).


Network Management

Use of industrial type Ethernet switches for critical mission applications.

SNMP protocol for the monitoring and reporting of different fault

conditions of the station bus and process bus LANs such as link loss,

errors in a Ethernet frame, TCP or IP packet, network statistics, etc.

IEEE 802.1p standard in order to tag the data frames with different priority

levels. Protection functions data traffic has the highest priority follow by

control functions data traffic.

IEEE 802.1Q standard in order to classify and group the substation IEDs

with different transmission requirements in multiple and independent

VLANs independent of their physical network connection.

Filtering of multicast data packets in order to allow the transmission of

GOOSE messages and sampled values only to those IEDs requiring that

reception.


Topology

Hierarchical double star, double ring or hybrid configuration in order to

provide redundancy and fault tolerance to the station bus LAN´s

backbone.

Double star, double ring or hybrid configuration, highly reliable in order to

provide redundancy and fault tolerance to the process bus LAN´s

backbone. (It shall also guarantee no Ethernet frames loss).

IEEE 802.1w standard that allows the creation of fault tolerant and self-

healing network architectures

In a ring topology, the maximum recovery time shall be of 5 ms/switch.


Ruteador Switch IHM Switch IHM

A la UCM

Radios

Gateway

SCADAIHM GPS

Switch L1-Ln

DEI1-L1

DEI1-Ln

DEI2-L1

DEI2-Ln

CB

Switch T1

DEI1-T1

DEI2-T1

DEI3-T1

CB

Switch Tn

DEI1-Tn

DEI2-Tn

DEI3-Tn

Switch A1-8

DEI-A1

DEI-A2

DEI-A3

DEI-A4

DEI-A5

DEI-A6

DEI-A7

DEI-A8

Switch A9-An

DEI-A9

DEI-A10

DEI-A11

DEI-A12

DEI-A13

DEI-A14

DEI-An

CB

Cable UTP

Cable de fibra

ópticaEnlace

inalámbrico

Switch BC (1-n)

DEI1 AT1-ATn

DEI2 AT1-ATn

DEI1 MT1-MTn

DEI2 MT1-MTn

CB

DEI1 DB1-DBn

A. T.

M. T.

Dif. Barras


The main objective of this project was to invest in the use of

new technologies that in the short or medium term allow CFE

to reduce the engineering and commissioning time as well as

the overall project costs.

One aspect of interest for CFE in the IEC 61850 standard was

the interoperability between IEDs from different vendors, it

claims.

The next step of this carried out work, is to start a pilot project

consisting of the implementation commissioning and testing of

a distribution substation, in order to evaluate the benefits of

implementing the IEC 61850 standard.

Conclusions

End of PresentationThank you !!!

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