Research on interlocking CILO
based on IEC 61499/62351
Jiaqi Pan
1
, Bin Duan
1
, Chaowu Qiu
2
, Guojing Li
1
1
College of Information Engineering,
Xiangtan University, Xiangtan, 411105, P.R.China
2
CSR ZHUZHOU ELECTRIC CO.,LTD.
Zhuzhou, 412001, P.R.China
E-mail: seven-eleven1989@hotmail.com
Abstract: Function Blocks method which meets the standard IEC
61499 is applied to the implementation of specific details of the
digital substation interlocking CILO in the IEC 61850, making
the static structures of CILO executable. Digital substation
mapping architecture is established which making the designed
function block can be compatible with both IEC 61850 and IEC
61499. The CILO interlocking communication module is given in
the paper. Moreover, safety expansion for the communication
GOOSE message and security GOOSE message is designed based
on IEC 62351-6, which not only meets the demands of real-time
communication, but also have a high safety degree. The
communication of interlocking and security authentication
process is described.
Index Terms: Digital Substation; IEC 61499; IEC 61850; CILO;
IEC 62351; interlocking
I. INTRODUCTION
Grid network fault is a threat to the safety and stability of
electric power system that causes the loss of economic assets
and even a threat to human life. We can avoid power
dispatching error and human error operating of substation
through protective mechanisms. But these technologies seem
not compatible with digital technology recently. Digital
substation technology is to establish the uniform digital model
communication platform of substation based on IEC 61850
and implement digital communication between primary
equipment and secondary equipment to ensure interoperability
of IED (intelligent electronic device). In digital substation
following IEC 61850, it apply allowance and forbiddance of
blocking technology on device switches to prevent error
operation [1][2].
Applying FB function block method of distributed
industrial process measurement and control system(IPMCS)
which meet the IEC 61499 to solve logical node problems of
IEC 61850, and mapping logical node ,logical device of digital
substation to basic and composite function block of
IEC61499[4-7]. Therefore, the function of logical node and
logical device can be implemented by FB function block. But,
few studies have been done for the security of internal
implementation details, such as internal algorithms, data flow
as well as specific implementations.
IEC 61850
standard
defines an intelligent architecture which
contains protection, monitoring, control and automation
functions and it’s widely used in the power industry. However,
one area was intentionally left blank: IEC 61850 does not
standardize the representation of combinatorial, sequential,
rule-based power system control and automation logic.
Usually, different suppliers use different and incompatible
hardware platforms. Therefore, the interoperability can not be
achieved. The IEC 61499 standard can fill this gap that it can
be used to define the algorithms for a wide range of control
and automation functions [4-7].
In digital substation, the messages need to be transmitted
within 4ms and encryption or other security measures which
affect transmission rates are not acceptable. Therefore,
authentication is the only security measure included, and IEC
62351-6 provides a mechanism that involves minimal compute
requirements for these profiles to digitally sign the messages
[8].
The interlocking security communication of real-time in
digital substation needs the following properties: 1) Integrity,
network transmission is not subject to any modification,
deletion, insertion or retransmission. 2) Availability, the
information can be accessed by legitimate users and use in
accordance with requirement of the order.
In this paper, we design security GOOSE message to
implement security interlocking communication of digital
substation, and propose a CILO composite function block
model which meets the standard IEC 61499 and IEC 61850.
II. CILO INTERLOCKING ARCHITECTURE
Figure 1 shows a basic circuit diagram of 220KV Chayuan
substation. It includes dual-bus and three bays, and each bay
including input and output line, switching electrical device,
ground wire and connection wires among devices.
From above picture, we get entire processing of substation
security interlocking function achievement which shows in
figure 2. The logical nodes it contains are: switching controller
(CSWI), interlocking (CILO), man-machine interface (IHMI),
isolating switch (XSWI), circuit breaker (XCBR). And the
specific procedures are as follows [9]:
• The interlocking principles are installed to prevent
978-1-4577-0547-2/12/$31.00 ©2012 IEEE
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