Note: Descriptions are shown in the official language in which they were submitted.
CA 02854201 2014-05-01
TRANSFORMER SUBSTATION DUAL-PROTOCOL MONITORING SYSTEM AND
METHOD THEREOF
FIELD OF THE INVENTION
[0001] The present invention relates to the technical field of power
transformation
monitoring, and in particular to a monitoring system, a system working method
and a system
transformation method used upon intelligent transformation of a transformer
substation.
BACKGROUND OF THE INVENTION
[0002] Upon intelligent transformation of a transformer substation, a
communication
protocol is needed to be updated, which relates to parallel operation of an
old monitoring
system and a new monitoring system. For example, the transformer substation is
connected to
a station control layer network using the IEC103 protocol nowadays,
intelligent
communication interface transformation is performed on a spacing layer
monitoring device
during the transformation, and the transformed monitoring device is connected
to a new
intelligent station control layer network using the IEC61850 protocol. The
current
transformation method is as shown in Figure 1, and the monitoring device is
connected to two
monitoring systems, where the new protocol monitoring device uses the new
monitoring
system, and the old protocol monitoring device uses the old monitoring system.
Such
intelligent transformation solution of the transformer substation has the
following three
disadvantages. Firstly, during the transformation, the new and old monitoring
systems operate
in parallel, which increase the monitoring load of the operator and the system
risk of
transformation project significantly. Secondly, during some processes of
intelligent
transformation of the transformer substation in which the function of
preventing mal-locking
is achieved only by logical locking of the spacing layer, direction
communication between the
devices can not be implemented due to the inconsistent protocol, resulting in
that data can not
be exchanged mutually between some of the monitoring devices having locking
association,
which causes that the spacing layer monitoring device can not achieve perfect
logical locking
during the transformation, and the transformer substation loses the function
of preventing
mal-locking. Thirdly, during the transformation, a quadratic model of the
original IEC103
protocol needs to be abolished for the device to be transformed, and a model
of the IEC61850
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protocol is needed to be built, related database content and monitoring image
association are
all needed to be re-adjusted manually, the amount of operation during each
interval is huge,
incorrect association can not be avoided by the manual adjustment, not only
the time of the
project is lengthened, but also the incorrect association will become security
risk, which will
result in false control of other device and cause system accident.
SUMMARY OF THE INVENTION
[0003] The technical problem to be solved in the invention is to provide a
monitoring
system, monitoring method and transformation method to be used in the
intelligent
transformation of the transformer substation.
[0004] To achieve the above object, the technical solutions of the invention
are as follows.
A transformer substation dual-protocol monitoring system, wherein old protocol
A and B
networks of a substation control layer are connected to an old protocol
standard monitoring
and protection device respectively, new protocol A and B networks of the
substation control
layer are connected to a new protocol standard monitoring and protection
device respectively,
a monitoring backstage server is provided with four Ethernet ports connected
to the new and
old protocol A and B networks respectively, for receiving data of the new and
old protocol
standard monitoring and protection devices, and processing the data of the old
protocol
standard monitoring and protection device according to an old protocol
standard and
processing the data of the new protocol standard monitoring and protection
device according
to a new protocol standard.
[0005] A monitoring method of a transformer substation dual-protocol
monitoring system,
including:
step 1, receiving, by a monitoring backstage server, data on old and new
protocol A and
B networks;
step 2, determining, by the monitoring backstage server, whether the data is
old protocol
data; proceeding to next step if the data is the old protocol data, otherwise
determining
whether the data is new protocol data; proceeding to next step if the data is
the new protocol
data, otherwise determining that the data is invalid data and discarding the
data;
step 3, determining whether an address of the data is valid; proceeding to
next step if the
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address of the data is valid, otherwise determining that the data is invalid
data and discarding
the data;
step 4, receiving, by the monitoring backstage server, the data; and
processing the data
according to a corresponding protocol; and
step 5, implementing, by the monitoring backstage server, substation control
layer
interlocking according to the data.
[0006] A method for intelligent transformation of a transformer substation
using a
dual-protocol monitoring system, including:
step 1, building new protocol A and B networks of a substation control layer
and a new
protocol standard monitoring and protection device, and connecting the new
protocol standard
monitoring and protection device to the new protocol A and B networks;
step 2, connecting a dual-protocol monitoring backstage server to old protocol
A and B
networks and the new protocol A and B networks;
step 3, operating the dual-protocol monitoring backstage server, and operating
the old
protocol and the new protocol synchronously for transition;
step 4, removing the old protocol A and B networks after the old protocol
standard
monitoring and protection device is replaced by the new protocol standard
monitoring and
protection device; and
step 5, connecting the dual-protocol monitoring backstage server only to the
new
protocol A and B networks, to serve as a general single-protocol monitoring
backstage server.
[0007] As compared with the current intelligent transformation solution of the
transformer
substation, the invention is advantageous in that it solves the series of
problems generated by
parallel operation of the new and old monitoring systems during the
intelligent transformation
of the transformer substation effectively. Firstly, the monitoring backstage
supporting dual
protocols can receive and process the data of all of the new and old devices
within the
substation synchronously, and during the transition, an operator can monitor
and control all of
the devices in the substation only by the monitoring backstage supporting dual
protocols, and
the transition requirement during the transformation is met. Secondly, the
integrity of the data
provides a necessary condition for the interlocking of the substation control
layer, the problem
that the transformer substation loses the function of preventing mal-locking
during the
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intelligent transformation is solved by providing perfect logical locking in
the substation
control layer, and the security of the intelligent transformation project of
the transformer
substation is ensured. Finally, the monitoring system achieves seamless
transition of the
IEC61850 protocol and the IEC103 protocol, the updating of the quadratic model
of the
device in the transformer substation monitoring system can be achieved only by
performing
simple protocol type setting during the transformation of the device, and
since the updating of
the model is performed by a program, the accuracy of the database and the
image during the
transformation is ensured, and the error due to the human factor during the
transformation is
avoided.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] The drawings are provided for further understanding of the invention,
and the
drawings form a part of the specification. The drawings, together with the
embodiments of the
invention are intended to explain the invention, but not to limit the
invention, in which:
[0009] Figure 1 is a schematic diagram of a network in which intelligent
transformation of a
transformer substation is performed not using a dual-protocol monitoring
system;
[0010] Figure 2 is a schematic diagram of a network in which intelligent
transformation of a
transformer substation is performed using a dual-protocol monitoring system;
[0011] Figure 3 is a schematic structural diagram of a dual-protocol
monitoring system; and
[0012] Figure 4 is a flow chart of a dual-protocol monitoring system.
DETAILED DESCRIPTION OF THE INVENTION
[0013] The preferred embodiments of the invention are described in conjunction
with the
drawings. It should be understood that the preferred embodiments described
here are only
intended to describe and explain the invention, but not to limit the
invention.
[0014] The transformer substation automation system consists of a substation
control layer
and a spacing layer logically. The substation control layer consists of
functional substations,
such as a computer and operator substation, a remote communication device, an
engineer
substation, an integration data platform, and a protection and trouble wave
recording
information management substation. The spacing layer consists of secondary
subsystems,
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such as a monitoring system monitoring device, a relaying and protection
system, a trouble
wave recording system and a metering system, which are connected to a primary
system
device via a control cable, and are connected to the substation control layer
network via a
network interface, for communicating with devices in the substation control
layer.
[0015] Referring to Figure 3, it can be seen that the transformer substation
dual-protocol
monitoring system is provided with a monitoring backstage, i.e., a working
station adapted to
be used by the transformation operator to monitor and change the operation
manner of the
primary device in the substation. The working backstage server is provided
with four Ethernet
ports, with two ports being connected to the old protocol A and B networks of
the substation
control layer, and the other two ports being connected to the new protocol A
and B networks.
By taking the old protocol being the IEC103 protocol and the new protocol
being the
IEC61850 protocol as an example, the four Ethernet ports of the dual-protocol
backstage
server are connected to the A and B networks of the original substation
control layer IEC103
protocol network and the A and B networks of the new substation control layer
IEC61850
network respectively, for receiving the data of all the monitoring devices in
the substation
synchronously, so that the problem that the network device of the IEC103
protocol
communication and the network device of the IEC61850 protocol communication
can not
communicate directly due to the different communication protocols, which
results in that data
can not be exchanged mutually between some of the monitoring devices having
locking
association, is solved. Since the new dual-protocol monitoring system server
can receive the
data of all the monitoring devices in the substation synchronously, the
integrity of the data
ensures that the interlocking of the substation control layer can be achieved,
and the security
loophole that the locking function of the whole substation during the
transformation is not
perfect is made up.
[0016] New protocol A and B networks of the substation control layer are the
MMS
network, in which the high-speed redundant network of double star type
topology structure
and communication protocol of IEC61850 standard are adopted. The above
monitoring and
protection device includes: a monitoring device, i.e., the device in the
transformer substation
for collecting remote signaling and remote measuring data of the primary
device and the
secondary device and controlling and adjusting some or all of the primary
devices; and a
protection device, i.e., the secondary device for performing protection
action, such as
protective trip and re-closing, based on the analysis and calculation of the
grid parameters
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such as current and resistance.
[0017] As shown in Figure 4, the monitoring method by the backstage server of
a
transformer substation dual-protocol monitoring system includes:
step 1, receiving, by a monitoring backstage server, data on old and new
protocol A and
B networks;
step 2, determining, by the monitoring backstage server, whether the data is
old protocol
data; proceeding to next step if the data is the old protocol data, otherwise
determining
whether the data is new protocol data; proceeding to next step if the data is
the new protocol
data, otherwise determining that the data is invalid data and discarding the
data;
step 3, determining whether an address of the data is valid; proceeding to
next step if the
address of the data is valid, otherwise determining that the data is invalid
data and discarding
the data;
step 4, receiving, by the monitoring backstage server, the data; and
processing the data
according to a corresponding protocol, performing simple protocol type setting
to the device
to be transformed, updating the quadratic model of the device in the
transformer substation
monitoring system; and
step 5, implementing, by the monitoring backstage server, substation control
layer
interlocking according to the data.
[0018] In accordance with the above method, the server can shield the
difference due to the
difference in the source of the data (the data from the new protocol A and B
networks, or the
data from the old protocol A and B networks) for the user, the substation
control layer
interlocking of the whole substation can be achieved for both the data of the
new substation
and the data of the old substation, so as to provide the user with the uniform
and perfect
application picture library interface.
[0019] By performing network traffic test and network pressure test to the
intelligent
monitoring system, the communication and process performances of the
monitoring system
and the spacing layer device are verified. Thereby, it is founded that because
the monitoring
system establishes communication connection frequently with the device which
has not been
transformed but has been modeled in accordance with the IEC61850 protocol, non-
refreshing
of the data is caused. After discussion, all the addresses of these devices
are set as invalid
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address, and are adjusted after the transformation, which avoids the
possibility that incorrect
operation of the monitoring system takes place in the field due to the
intelligent
transformation.
[0020] As shown in Figure 2, the method for intelligent transformation of a
transformer
substation using a dual-protocol monitoring system includes:
step 1, building new protocol A and B networks of a substation control layer
and a new
protocol standard monitoring and protection device, and connecting the new
protocol standard
monitoring and protection device to the new protocol A and B networks;
step 2, connecting a dual-protocol monitoring backstage server to old protocol
A and B
networks and the new protocol A and B networks;
step 3, operating the dual-protocol monitoring backstage server, and operating
an old
protocol and the new protocol synchronously for transition;
step 4, removing the old protocol A and B networks, after the old protocol
standard
monitoring and protection device is replaced by the new protocol standard
monitoring and
protection device; and
step 5, connecting the dual-protocol monitoring backstage server only to the
new
protocol A and B networks after the transition, to serve as a general single-
protocol
monitoring backstage server.
[0021] Accordingly, the transformation solution for the electrical device is
as follows.
[0022] The 500kV system: for the 500kV system, since no integral electrical
locking is
provided in the operation loop of the primary device, the operation loop must
ensure the
integral logical locking function. During the transformation, the interlocking
function of the
bus spacing layer is suspended, and the logical locking function of the bus
isolation switch is
achieved by the substation control layer interlocking function, and after the
transformation is
completed, the interlocking function of the bus spacing layer is recovered and
the integrity of
the spacing layer interlocking in the whole substation is recovered.
[0023] The 220kV system: the 220kV power distribution device is implemented by
the Gas
Insulated Switchgear (GIS) device, the integral electrical locking is provided
in the operation
loop of the primary device, and the substation control layer interlocking can
achieve the
locking logic of the spacing layer during the transformation completely,
therefore, it is
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allowable that the logical locking function of the monitoring and control
device is exited
during the transformation transition. After the monitoring and control devices
are connected
to the intelligent substation control layer network one by one, the logical
locking function of
the monitoring and control device of the bus isolation switch is recovered,
and after all the
bus spacing monitoring and control devices are connected, the logical locking
function of the
monitoring and control device of the bus grounding switch is recovered.
[0024] The main transformer three sides isolation switch and grounding switch:
the main
transformer three sides grounding switch is provided with integral electrical
locking (the
500kV side grounding switch is provided with main transformer 500kV side non-
pressure
locking, and the 220kV grounding switch is provided with an electrified
display device), and
no electrical locking is provided between the main transformer three side
isolation switch and
the grounding switch on respective sides. During the power-off of the main
transformer for
transformation, all the locking logics are contained in the logical locking of
the substation
control layer provided by the dual-protocol backstage, thereby the integral
logical locking
function is ensured.
[0025] Being compatible with the IEC61850 and IEC103 protocols, during the
whole
transformation, the system can receive the data of all the monitoring and
control devices in
the substation all the time, the operator monitors and controls all the
devices in the whole
substation directly by the new intelligent monitoring system, and the
monitoring pressuring of
the transformer substation is reduced during the transformation.
[0026] During the whole transition, the operator can monitor and control all
the devices in
the substation only by the operator substation in the new intelligent
substation control layer, to
meet the transition requirement during the transformation of the substation
control layer. And
since the new dual-protocol monitoring system can receive the data of all the
monitoring and
control devices in the substation synchronously, the integrity of the data
ensures that the
interlocking of the substation control layer can be achieved, and the security
loophole that the
function of the whole substation locking during the transformation is not
perfect is made up.
[0027] The monitoring system achieves seamless transition of the IEC61850
protocol and
the IEC103 protocol, the updating of the quadratic model of the device in the
transformer
substation monitoring system can be achieved only by performing simple
protocol type
setting to the device to be transformed during the intelligent transformation
of the device, and
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since the updating of the model is performed by the program, the accuracy of
the image
library during the transformation is ensured, and the error due to the human
factor during the
transformation is avoided.
[0028] Finally, it is to be noted that the above are only preferred
embodiments of the
invention, but not intend to limit the invention. Although the invention is
described in detail
with reference to the above embodiments, the technical solutions set forth in
the above
embodiments can be modified or some of the features thereof can be substituted
equivalently
by those skilled in the art. Any modifications, alternations, improvements and
the like made
within the spirit and principle of the invention should be contained in the
scope of protection
of the invention.
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