Design of One Chip Communication Stack Processor and MMS Communication Stack Library Based on IEC 61850 Eunkyu In Hanyang University, Seoul, Korea
[email protected]
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Contents 1.
What is IEC 61850?
2.
Network Processor based vs. Legacy IEDs
3.
Data Structure of IEC61850 in IED
4.
System Layer in IEC61850
5.
Structure of Proposed Processor
6.
Advantages of OneChip SoC and Library
7.
Development Goal
8.
Develop Procedure
9.
IEC 61850 Library
10. Simulation 11. Conclusion
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What is IEC 61850 ? " A set of standards associated with“Power systems management on info rmation exchange” " Include the application of modern networking to electrical power substati on automation such as § Requirement – define quality requirements(reliability, maintenance, security,…) § Configuration – define system configuration § Protocol – define network protocol requirements § Testing – define test requirements
" MMS(Manufacturing Message Specification), GOOSE(Generic Object Oriented Substation Event), SV(Sam pled Value)
" Run over TCP/IP networks and/or substation LANs § High speed switched Ethernet (response times with < 4 ms)
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Network Processor based vs. Legacy IEDs
Mapping is required
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Core Functions of IEC 61850 " Standardized mapping instead of numbers or indexes in Legacy IED § Easy to be implemented by IEC 61850 library
" Abstract Communication Service Interface(ACSI) § Easy to create messages between application and many devices
" Independent network protocol in a substation § Possible to be applied to all network protocol
" A configurable language § Exchange information between IED and client
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Data Structure of IEC 61850 in IED
Data Attribute
Data
Logical Node
Logical Device
Physical Device
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" Properties of Data Objects § Common logical node information (e.g. name, health, position…) § Status Information (e.g. status of functions] § Settings (for operation functions) § Measured values (e.g. CT, VT…) § Controls (e.g. ON / OFF) § Protection " Functions of Logical devices. e.g. XCBR: circuit breaker
" Collections of Physical devices
" Devices for Protection, Measurement, Con trol
System Layer of IEC61850(1) " ACSI(Abstract Communication Service Interface) : Interface for the client and server communications § Abstract data structure for IED
Abstract Common Data Model (Objects, Servic § Support es) - Real-time data access and retrieval - Device Control - Event reporting and logging - Communication between Sender (publisher) and receiver Device Data (subscriber)Data - File transfer capabilitiesModel Types Objects
Naming Conve ntion
M A P P I N G
" SCSM(Specific Communication Service Mapping) : MMS § Abstract data is mapped to specific standardized data (MMS, GOOSE, SV)
GOOSE / SV
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System Layer of IEC61850(2) " GOOSE(Generic Object Oriented Substation Event) : § Used for sending trip messages to IED § Multicast Abstract Common Data Model (Objects, Servic § Time Limit of GOOSE is less than 4ms es) § Send 3 times § Layer 1 and 2 of OSI 7 Layers are used " MMS(Manufacturing Message Specification) :
Device
§ Interface between Users and IEDs for data exchange Model
Data Objects
Data Types
Naming Conve ntion
§ Used for reporting and requesting IED status § Change operating status of IED
" SV(Sampled Value) :
§ All of the OSI 7 layers are used
§ Sent to users from merging unit § Values of current and voltage
M A P P I N G MMS GOOSE / SV
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What is Intelligent Electronic Device (IED)?
" Functions of IED § Protection - Of Over current and earth fault
§ Control - Local and remote control
§ Monitoring - Circuit-break condition, trip circuit, gas density, relay temperature - Event recording
§ Metering - Of currents, voltages, active power, reactive power
§ Communication - With a control center and other IEDs
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Architecture of Legacy IED Logic (HMI) processor module
Control Center Digital input
Digital output
Vr 22900 Ir 1230 kW
345 Hz
Vs 22900 Is 1230 kAR
12 PF
V ca
Ic Ia
Vt 22900 It 1230 kWh 1234 V n
0 In
0
Digital Inputs
kA Rh
98
V
Ib
bc
1 2 3 4 5 6 7 8
Digital Outputs 1 2 3 4 5 6 7 8
DPRAM
IEC 61850 Wrapper
DPRAM
PT
D P R A M
Main processor module
CT
D P R A M
IEC 61850 processor module
Communication module PT100Ω
IEC 61850
CT/PT processor module
4-20mA
"
ab
AB C
CB
IED
V
HMI Control
HMI
Digital I/O Control
Measurement Control
The legacy IED consists of 3 H/W boards §
§ §
Measurement Control - CT/PT processor module : Converts analog(CT/PT) to digital - Main processor module : Manages total operation of IED HMI control - Logic Processor module : Controls logic and peripherals, and performs function of IED IEC 61850 - IEC 61850 processor module : Performs IEC 61850 communication S/W - Communication module : Performs communications with other IEDs
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Structure of Proposed IED " Architecture of Legacy IED
Logic (HMI) processor module
Digital output
V ca
Vr 22900 Ir 1230 kW 345 Hz Vs 22900 Is 1230 kAR
Ic
12 PF
Ia
Vt 22900 It 1230 kWh 1234 V n
0 In
0 kA Rh
98
V
Ib
bc
Digital Inputs 1 2 3 4 5 6 7 8 Digital Outputs 1 2 3 4 5 6 7 8
DPRAM
V ab
Digital input
V n
Digital output
0 In
0 kA Rh
98
V
Ia Ib
bc
V ab
Digital Inputs 1 2 3 4 5 6 7 8 Digital Outputs 1 2 3 4 5 6 7 8
DPRAM
PT
Communication module
Measurement Control
CT/PT processor module
CB
Main processor module
CT
4-20mA PT100Ω
Measurement Control
D P R A M
Logic (HMI) processor module
D P R A M
IEC 61850 processor module
IEC61850 Network Processor = Logic Processor Module + IEC 61850 Processor Module
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IEC 61850
IEC 61850 processor module
D P R A M
Communication module
Main processor module
D P R A M
IEC 61850
D P R A M
CT
§
12 PF
AB C
CT/PT processor module
PT100Ω
ca
Ic
Vt 22900 It 1230 kWh 1234
PT
4-20mA
V
Vr 22900 Ir 1230 kW 345 Hz Vs 22900 Is 1230 kAR
AB C
CB
HMI
Digital I/O Control
HMI Control
HMI
Digital I/O Control Digital input
" Architecture of Proposed IED
Advantages of OneChip SoC § The Legacy IEC61850 board is big size and power consumption -> OneChip SoC is smaller, lower power § Long developing time in legacy IEC61850 board -> OneChip SoC skips the board development § Convenience of maintenance and repair – just replaced by SoC, not a board § OneChip SoC is 5 times cheaper than of legacy boards
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Advantages of IEC 61850 Library § Programming by OOP, easy to revise and analyze IEC 61850 library § Expandabilities and readabilities § Convenient GUI
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Development Goal " IEC 61850 Network Processor §
OneChip SoC
§
IEC 61850 Library
§
Logic Editor
IEC 61850 Library
OneChip SoC
Logic Editor
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Develop Procedure of IEC 61850 Network Processor Procedure 1
Procedure 2
Procedure 3
IEC 61850 Library
IEC 61850 Platform
OneChip SoC
IEC61850 Processor
LCD
FPGA
"
"
IEC 61850 Library §
SCL Configurator
§
Service
§
Communication
Logic Editor
Logic Processor
"
Memory
Logic editor
IEC 61850 Platform
"
IEC 61850 OneChip SoC
§
IEC 61850 Processor
§
Dual Processor
§
Logic Processor
§
10/100/1000 Ethernet, I/O
§
FPGA
§
10/100/1000 Ethernet, I/O
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Platform for OneChip SoC IEC61850 Processor
LCD
FPGA
Memory
Logic Processor
SoC
Specification CPU
Two ARM 926EJ-S
FPGA
Xilinx vertex 5
High Speed Memory
DDR2 SDRAM (SO-DIM M)
Communication
2-channel UART
Video
4.3”(480 x 272) TFT-LCD
Audio
AC97 Audio Codec
Download Port
Xilinx Platform Flash
Power Supply
Micro-ATX PC Power Supply
PC-133 64MB SDRAM
2MB Asynchronus SRAM
10/100/1000 Ethernet
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USB 2.0 OTG
Flash ROM 32MB
Specification of OneChip SoC
Specification Design Package
TSMC 0.13 Logic 1P/8M 1.2V Core 3.3V I/O BGA 528, 27X27x2.23mm
CPU
Dual ARM926 / 333MHz
RAM
64MByte
Flash memory
32 Mbyte
Ethernet Other interfaces Architecture of OneChip SoC
I/O
10/100/1000 MAC USB2.0,I2C,SPI,Uart,LCD 24 freely prog. PIO pins(GPIO), 8 x IRQ, 2x external DMA, 3 timer Inputs/outputs 24-bit address bus, 16-bit data bus Color LCD Controller Nand Flash Controller
Operating Voltage
1.2V/3.3V
Heat dissipation
975mWatt
Temp. range IEC61850 Library Implementation Layout of OneChip SoC
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-40 to 85 °C Object-Oriented Programming Full IEC 61850
IEC 61850 Library System Configurat or
SSD
" 4 functions in IEC 61850 library
SCD
ICD
IED Configurat or
SCL Engineering
§ SCL Engineering -
CID
Initialization
I ni t _S CL MMS S er v er R s p
MMS Cl i ent R eq
MMS COMMR S PS er v
MMS COMMR EQS er v
R EQCont r ol
§ Initialization -
Service
MMS Mpl MMS Decoder
MMS OPCode
§ Service
A CS ES er v (Pr es ent at i on Pr ot ocol )
A S N1 I S OS P I S OT P
Read LD and LN Values from CID file
MMS Ms gUt i l
COMMS er v
I S OPP
Describe functions(LD, LN) in IED and substation
-
Create and analyze IEC 61850 MMS message
-
Encode and decode messages
Communication
(S es s i on Pr ot ocol ) (T r ans por t Pr ot ocol )
Gener al S ock et
§ Communication
Structure of IEC 61850 Library
-
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OSI 7 Layers mapping
SCL Engineering SSD SSD
ICD ICD
" All devices in substation are described by SCL engineering. System System Configulator Configurator
SCD SCD
" SCL(System Configuration Language) § XML type § ICD(IED Capability Description)
IED Configulator Configurator
CID1 CID1
Control Center
- Describe functions of LD and LN in IED
§ SSD(System Specification Description) - Describe single PWR line and LN in the su bstation
CID2 CID2
Ethernet Switch
Ethernet Switch
IEC 61850 Process Bus
IEC 61850 Station Bus
§ SCD(Substation Configured Description) - Describe functions of the substation by mer ging ICD and SSD
§ CID(Configured IED Description) - Describe and configure functions for each I ED
IED
SCL Engineering
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Initialization, Service, Communication " Initialization Module
" Communication Layer Module
Functions to initialize data_set and read LN, LD data from CID file.
Init_SCL
COMMServ
Functions to set or free the connection and take responsibility for receiving and sending packets.
ACSEServ
Functions to provide OSI 7 layer environment of messages.
" Service Module MMSServerRsp
MMSClientReq
MMS Response Packet Creation
MMS Request Packet Creation
MMS Request Packet Analysis
MMS Response Packet Analysis
MMSCOMMRspServ
ISOPP
Functions to negotiate the transfer syntaxes.
ASN 1
Functions to encode or decode response / request message to ASN. 1 format.
ISOSP
Functions to manage session.
ISOTP
Functions to check error.
MMSCOMMReqServ
MMS Response Packet transfer
MMS Request Packet transfer
REQControl
Functions to manage request messages and check whether the response messages are received or not MMSMpl
Functions to make MMS messages for request / response. MMSDecoder
MMSOPCode
MMSMsgUtil
GeneralSocket
Functions to decode MMS messages Functions to map variable on MMS messages. Functions to splits fields of MMS message.
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Functions to manage packets for actual communication.
Simulation " 1) server show s data value " 2) client reads data from the s erver 1) Server
2) client
" 3) client writes data to server " 4) confirm data of server
3) Client
4) Server
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Conclusion "
Developed network processor (OneChip SoC and Library) for I EC 61850 will be core functions in Smart Grid
"
Network processor with high reliability, small size, low power an d short period time of development
"
Library with expandabilities and readabilities by OOP
"
It is easy for users to develop an IED by providing one pass net work processor
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