26-04-2011, 02:59 PM
[attachment=12856]
ABSTRACT
SCADA systems are used in pv power plants for monitoring,control,remote communication purposes
This paper It provides two effective solutions
1.security access control strategy
2.redundency mechanism
The proposed security access control strategy and some measures, such as security authentication, data encryption, as well as role-based access control
INTRODUCTION
Solar energy
SCADA system widely used in pv plants
PV generation can be divided into
Stand alone pv system
Grid connected pv system
The reliability of SCADA system is mainly
affected by two factors:
communication failure
device failure.
To solve device failure issues, two ways:
improving device MTBF
providing device redundancy.
SCADA SYSTEM STRUCTURE
This device circuit improved control
performance and saved system costs
Control,PWM drive, as well as signal
conditioning circuit were omitted
GSM,GPRS and GPS,industrial field bus
more advantage and high cost
Ethernet fieldbus and RS485 in pv plants
Communication security
Communication security can be
classified as
1)security communication strategy
2)security measur
The security measure classified into 3
types
a) security certification
b) encryption
c) role based access control
RBAC three roles
(administrator,operator,ordinaryuser)
Redundancy mechanism
Redundancy topology:
based on TCP/IP Ethernet fieldbus
based on Modbus RS485 BUS
B. Redundancy services:
synchronization request service,
device switching service,
redundant service
C. Redundancy switching:
1) Device redundency switching
2)Network redundency switching
Experimental tests
The user-id,password,and
priority.
the service message were
captured through a protocol
analysis software- Ethereal
Active device(128.128.2.17)
was malfunction. Alternative
device(128.128.2.15) was
switched to be active
Conclusions:
In this paper, a complete SCADA system of pv power plants has been present
Concentrating on the communication reliability of SCADA system, security communication strategy and redundancy mechanism
It can avoid the system being disturbed or breached by invalid message
Reliable communication between SCADA RTU and server
Redundancy mechanism improved the reliability of SCADA communication network
ABSTRACT
SCADA systems are used in pv power plants for monitoring,control,remote communication purposes
This paper It provides two effective solutions
1.security access control strategy
2.redundency mechanism
The proposed security access control strategy and some measures, such as security authentication, data encryption, as well as role-based access control
INTRODUCTION
Solar energy
SCADA system widely used in pv plants
PV generation can be divided into
Stand alone pv system
Grid connected pv system
The reliability of SCADA system is mainly
affected by two factors:
communication failure
device failure.
To solve device failure issues, two ways:
improving device MTBF
providing device redundancy.
SCADA SYSTEM STRUCTURE
This device circuit improved control
performance and saved system costs
Control,PWM drive, as well as signal
conditioning circuit were omitted
GSM,GPRS and GPS,industrial field bus
more advantage and high cost
Ethernet fieldbus and RS485 in pv plants
Communication security
Communication security can be
classified as
1)security communication strategy
2)security measur
The security measure classified into 3
types
a) security certification
b) encryption
c) role based access control
RBAC three roles
(administrator,operator,ordinaryuser)
Redundancy mechanism
Redundancy topology:
based on TCP/IP Ethernet fieldbus
based on Modbus RS485 BUS
B. Redundancy services:
synchronization request service,
device switching service,
redundant service
C. Redundancy switching:
1) Device redundency switching
2)Network redundency switching
Experimental tests
The user-id,password,and
priority.
the service message were
captured through a protocol
analysis software- Ethereal
Active device(128.128.2.17)
was malfunction. Alternative
device(128.128.2.15) was
switched to be active
Conclusions:
In this paper, a complete SCADA system of pv power plants has been present
Concentrating on the communication reliability of SCADA system, security communication strategy and redundancy mechanism
It can avoid the system being disturbed or breached by invalid message
Reliable communication between SCADA RTU and server
Redundancy mechanism improved the reliability of SCADA communication network
