CN109842099B - Method for realizing line protection dual secondary circuit - Google Patents
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Abstract
The invention relates to a method for realizing a line protection dual secondary loop, which comprises the following steps: the merging unit and the intelligent terminal of the interval are in communication connection with the line protection unit to form a point-to-point connection loop; the line protection unit, the merging unit of the interval, the intelligent terminal and the process layer switch of the interval are connected through an optical fiber network to form a network connection loop; the circuit protection dual secondary circuit is formed by two mutually independent connecting circuits. The problem of single secondary circuit in the optical fiber welded joint more, the secondary circuit appears unusually easily and causes frequent power failure to overhaul is solved to the reliability of circuit power supply has effectively been improved.
Description
Technical Field
The invention belongs to the field of intelligent substation relay protection, and particularly relates to a method for realizing a circuit protection dual secondary circuit.
Background
With the rapid development of the economic society, the power load is higher and higher, the requirement on the reliability of power supply is increased year by year, and especially, the power protection of important activities and the key guarantee project construction and the like provide higher requirements on the reliability of power supply of a power grid. The relay protection is a life line for protecting the power system, and has practical significance for ensuring the safe operation of the power system and reducing power failure caused by overhauling the relay protection and equipment as much as possible.
The secondary system of the intelligent substation adopts the industrial Ethernet technology to replace the traditional secondary wiring to transmit digital and analog signals, and the original secondary wiring which is mutually decoupled and connected by cables is replaced by mutually highly coupled and abstracted data streams. Compared with the conventional 110kV line protection of the conventional transformer substation, the 110kV line protection of the intelligent transformer substation realizes that the sampling of an alternating current loop is replaced by an optical fiber loop, so that the problems of open circuit, short circuit, multipoint grounding of a secondary loop of a current transformer, short circuit of a secondary loop of a voltage transformer and the like are avoided. In addition, the GOOSE digital information flow replaces the traditional 110kV line protection open-in open-out loop, a parasitic loop is eliminated, the loop insulation performance and the anti-interference capability are improved, and the loop problem caused by secondary wiring looseness is avoided.
Although technical innovation and progress are achieved in the aspect of a secondary circuit for protecting the 110kV line of the intelligent substation, a certain problem still exists in the aspect of reliability. The secondary circuit of the 110kV line protection consists of a 110kV line protection unit, a merging unit, an intelligent terminal and an exchanger which are all connected by optical fibers/optical cables, so that a large number of nodes for optical fiber fusion exist, including a 110kV line protection optical port to an intelligent terminal optical port, a 110kV line protection optical port to a merging unit optical port and a 110kV line protection optical port to an exchanger optical port. Through statistics, at least 24 fiber melting nodes are arranged at 110kV intervals in 1 typical intelligent substation, and when any fiber melting point is in problem, secondary circuit abnormity can be caused, so that 110kV line protection locking is caused. The abnormity of the 110kV line protection secondary circuit is one of the main reasons for power failure maintenance caused by operation faults, and comprises current and voltage link abnormity and open-in and open-out link abnormity caused by optical fiber circuit problems such as optical fiber fusion cold welding, optical fiber receiving/transmitting connector faults, optical fiber quality and the like.
Considering from the reliability principle, the single 110kV line protection secondary circuit comprises a large number of optical fiber welding links connected in series, the more the links connected in series, the lower the reliability, and the secondary circuit interruption or abnormity can be caused by the fault of any link. For example, in the comparative analysis of point-to-point and networking modes at the process level of an intelligent substation published in 2016, a technical scheme for mainly protecting point-to-point and other networking modes is provided through the comparative analysis of a network mode at the process of the intelligent substation, but the scheme is still based on a single protection loop, and does not solve the problem that a secondary circuit for line protection still exists in the field and comprises a large number of optical fiber fusion links connected in series.
Therefore, the improvement of the reliability of the 110kV line protection secondary circuit is an important guarantee for the safe operation of line protection.
Disclosure of Invention
According to the invention, on the basis of typical design of a 110kV line protection secondary circuit of an intelligent substation, a second group of secondary circuits are established by utilizing a process layer network, effectiveness selection of the secondary circuits is carried out through optimization protection function data logic judgment, a dual secondary circuit is realized, the problems that a single secondary circuit is provided with more optical fiber welding nodes and the secondary circuit is easy to be abnormal to cause frequent power failure maintenance are solved, and thus the reliability of line power supply is effectively improved.
In order to achieve the above object, the present invention provides a method for implementing a line protection secondary circuit, that is, a first scheme:
the merging unit and the intelligent terminal at the interval are in communication connection with the line protection unit to form a point-to-point connection loop;
the line protection unit, the merging unit of the interval and the intelligent terminal are all in communication connection with the process layer switch through a network to form a network connection loop;
the communication interface corresponding to the point-to-point connection loop and the communication interface corresponding to the network connection loop are physically independent of each other, and a line protection dual secondary loop is formed by the point-to-point connection loop and the network connection loop together.
Scheme II: on the basis of the first scheme, the point-to-point connecting loop and the network connecting loop are connected by adopting optical fiber communication to form an optical fiber point-to-point connecting loop and an optical fiber network connecting loop.
The third scheme is as follows: on the basis of the second scheme, the configuration mode of the optical fiber point-to-point connection loop is as follows: a first optical port of the line protection unit is connected with the merging unit at the interval, and a second optical port is connected with the intelligent terminal;
the configuration mode of the optical fiber network connection loop is as follows: and a third optical port of the line protection unit is connected with the process layer switch, and the merging unit and the intelligent terminal are respectively provided with an optical port connected with the process layer switch.
And the scheme is as follows: on the basis of the third scheme, the dual secondary loop adopts the following judgment logic:
setting an abnormal mark of a current and voltage input link of the optical fiber point-to-point connection loop, if any kind of information in the optical fiber point-to-point connection loop is judged to be abnormal, inputting the current and voltage of the optical fiber point-to-point connection loop into an abnormal mark position 1 of the link, and if no abnormality exists, setting the current and voltage input link to 0;
if any kind of information in the optical fiber network connection loop is judged to be abnormal, the current and voltage of the optical fiber network connection loop are input into the abnormal mark position 1 of the link, and if no abnormality exists, the current and voltage is set to 0.
And a fifth scheme: on the basis of the fourth scheme, the dual secondary loop further adopts the following judgment logic:
setting an abnormal mark of an open-in open-out link of the optical fiber point-to-point connection loop, and if any kind of information in the optical fiber point-to-point connection loop is judged to be abnormal, marking the position 1 of the abnormal mark of the open-in open-out link of the optical fiber point-to-point connection loop;
and if any type of information in the optical fiber network connection loop is judged to be abnormal, marking the position 1 of the abnormal mark of the open-in open-out link of the optical fiber network connection loop.
Scheme six: on the basis of the fifth scheme:
setting a data function priority flag bit of an optical fiber point-to-point connection loop and an optical fiber network connection loop; if the current and voltage input link of the optical fiber point-to-point connection loop is received to be abnormal or the input link and the output link are received to be abnormal and the optical fiber network connection loop is not abnormal, the priority of the data function of the optical fiber point-to-point connection loop is set to be 0 and the flag position of the data function of the optical fiber network connection loop is set to be 1;
if the current and voltage input link of the optical fiber network connection loop is received to be abnormal or the input link and the output link are received to be abnormal and the optical fiber point-to-point connection loop is not abnormal, the priority of the data function of the optical fiber network connection loop is set to be 0 and the flag position of the data function priority of the optical fiber point-to-point connection loop is set to be 1.
The scheme is seven: on the basis of the sixth scheme, if the priority of the data function of the optical fiber point-to-point connection loop is 1, and the priority of the data function of the optical fiber network connection loop is 0, the line protection unit only adopts the optical fiber point-to-point connection loop to realize data input and open-in and open-out, and does not adopt the optical fiber network connection loop to realize the protection function; if the priority of the data function of the optical fiber point-to-point connection loop is 0 and the priority of the data function of the optical fiber network connection loop is 1, the line protection unit only adopts the optical fiber network connection loop to realize data input and output, and does not adopt the optical fiber point-to-point connection loop to realize the protection function.
According to the method for realizing the line protection doubling secondary circuit, the two independent connecting circuits are established by utilizing the process layer network, and the doubling of the line protection is realized through the two connecting circuits, so that the risk brought by the single secondary circuit is reduced, and the reliability of the safe operation of the line protection is improved.
Meanwhile, a corresponding priority discrimination module is configured, and the advantages of digitization, networking and informatization of data transmission of the intelligent substation are utilized, and the protection circuit is more intelligent through optimizing logic judgment of protection function data.
Drawings
FIG. 1 is a wiring structure diagram of a dualized secondary circuit based on 110kV line protection;
FIG. 2 is a schematic diagram of the logic for determining the abnormality of the current-voltage input link according to the present invention;
FIG. 3 is a schematic diagram of the open-in open-out link exception logic determination according to the present invention;
fig. 4 is a schematic diagram of the validity selection logic determination according to the present invention.
Detailed Description
The technical scheme of the invention is as follows: the 110kV line protection dual secondary loop of the intelligent substation comprises two connection loops, wherein an optical fiber point-to-point connection loop consists of a line protection unit, a merging unit and an intelligent terminal, and the merging unit and the intelligent terminal at the interval are connected with the line protection unit to form a point-to-point connection loop; the line protection unit, the merging unit and the intelligent terminal are all connected with the process layer switch through a network to form a network connection loop; the communication interfaces corresponding to the point-to-point connection loop and the network connection loop are physically independent from each other, and a line protection dual secondary loop is formed by the point-to-point connection loop and the network connection loop.
The point-to-point connection loop and the network connection loop are physically independent from each other, and a dual secondary loop is formed together.
According to the double secondary loop, the following link abnormity judgment logic is adopted:
the current voltage input link distinguishing module monitors current voltage input links of the point-to-point connection loop and the network connection loop at the same time, and transmits link information to the data function priority distinguishing module;
the open-in open-out link judging module monitors open-in open-out links of the point-to-point connection loop and the network connection loop at the same time and transmits link information to the data function priority judging module;
the data function priority judging module receives the link monitoring information of the current and voltage input link judging module and the open-in and open-out link judging module at the same time; the default point-to-point connection loop data function priority mark is 1, and the network connection loop data function priority mark is 0;
the loop validity selection module selects the data validity of the optical fiber point-to-point connection loop and the optical fiber network connection loop according to the priority result output by the data function priority discrimination module.
The specific implementation method of the present invention is further described below with reference to the accompanying drawings:
as shown in fig. 1, a line protection secondary circuit of a 110kV substation is taken as an example. The intelligent substation 110kV line protection dual secondary loop comprises an optical fiber point-to-point connection loop and an optical fiber network connection loop. The 110kV line protection unit is provided with three optical ports, the first optical port is connected with the first optical port of the merging unit of the interval, and current and voltage data of the interval are obtained according to the IEC61850-9-2 standard; a second optical port of the 110kV line protection unit is connected with a first optical port of the intelligent terminal at the interval, and the opening in and the opening out are realized according to IEC 61850-8-1; forming a first secondary loop, wherein the loop is an optical fiber point-to-point connection loop. The third optical port of the 110kV line protection unit, the second optical port of the merging unit and the second optical port of the intelligent terminal are connected with the process layer switch of the interval to form a process layer network of the interval, the 110kV line protection acquires current and voltage data of the merging unit through the process layer network, and the entrance and exit are realized through the intelligent terminal; forming a second secondary loop, namely the optical fiber network connecting loop.
The optical fiber point-to-point connection loop and the optical fiber network connection loop are physically independent from each other, and in this embodiment, different optical ports are used for communication connection, so that mutual independence is achieved, but other methods capable of achieving independence of the two loops can be adopted, and the technical personnel in the field can set the methods as required.
The current voltage input link distinguishing module is used for judging corresponding abnormity and judging effective priority of the secondary loop, as shown in fig. 2, the current voltage input link distinguishing module is used for judging 6 types of abnormal information of the optical fiber point-to-point connecting loop and the optical fiber network connecting loop, wherein the abnormal information comprises lower limit of optical port receiving power, upper limit of optical port transmitting power, lower limit of optical port transmitting power, abnormal quality of any phase of SV, SV double AD inconsistency and continuous Tms no SV data, and T value range is 4-8 ms. If the current voltage input link judging module judges that any type of information in the optical fiber point-to-point connecting loop is abnormal, the current voltage input link of the optical fiber point-to-point connecting loop is abnormally set to be 1; and if the current voltage input link judging module judges that any type of information in the optical fiber network connection loop is abnormal, the current voltage input link of the optical fiber network connection loop is abnormally set to be 1.
As shown in fig. 3, the open-in open-out link determining module determines 6 types of abnormal information of the optical fiber point-to-point connection loop and the optical fiber network connection loop, where the lower limit of the optical port received power, the upper limit of the optical port transmission power, the lower limit of the optical port transmission power, the GOOSE quality abnormality, and no GOOSE data in consecutive Tms, where the T value range is 4-8 ms. The open-in open-out link judging module judges that any type of information in the optical fiber point-to-point connecting loop is abnormal, and marks the position 1 of an open-in open-out link abnormality mark of the optical fiber point-to-point connecting loop; if the open-in open-out link judging module judges that any type of information in the optical fiber network connecting loop is abnormal, the open-in open-out link of the optical fiber network connecting loop is marked at a position 1; if there is no exception, 0 is set.
As shown in fig. 4, if the data function priority discrimination module receives any information of the current-voltage input link abnormality and the open-in open-out link abnormality of the optical fiber point-to-point connection loop, the data function priority of the optical fiber point-to-point connection loop is set to 0, and the data function priority (i.e., priority flag) of the optical fiber network connection loop is set to 1; if any information of the current and voltage input link abnormality and the open-in open-out link abnormality of the optical fiber network connection loop is received, the priority of the optical fiber network connection loop data function is set to be 0, and the priority of the optical fiber point-to-point connection loop data function is set to be 1. If the priority mark of the optical fiber point-to-point connection loop data function is 1 and the priority mark of the optical fiber network connection loop data function is 0, the 110kV line protection only adopts the optical fiber point-to-point connection loop to realize data input and open-in and open-out, and does not adopt the optical fiber network connection loop to realize the protection function; if the priority mark of the data function of the optical fiber point-to-point connection loop is 0 and the priority mark of the data function of the optical fiber network connection loop is 1, the 110kV line protection only adopts the optical fiber network connection loop to realize data input and output, and does not adopt the optical fiber point-to-point connection loop to realize the protection function.
The method is a method for realizing a 110 kV-based line protection dual secondary loop, wherein the dual secondary loop consists of an optical fiber point-to-point connecting loop and an optical fiber network connecting loop; by utilizing the advantages of digitization, networking and information sharing of data transmission of the intelligent substation, on the basis of typical design of a protection secondary circuit of a 110kV line of the intelligent substation, a second group of secondary circuits are established by utilizing a process layer network, and effectiveness selection of the secondary circuits is carried out through optimization protection function data logic judgment, so that duplicate secondary circuits are realized, risks brought by a single secondary circuit are reduced, and the power supply reliability of the 110kV line is improved.
Of course, the above only shows the protection of the line suitable for 110kV, but the above method is not limited to this, and the same is also applicable to the 10kV, 220kV or other forms of abnormal protection of the secondary circuit.
The communication between the units is not limited to the optical fiber, and can be realized in other modes according to the needs.
In addition, the invention is not limited to the realization of protection loops with the merging unit, the intelligent terminal and the like, and the functional units such as the merging unit, the intelligent terminal and the like can be replaced by other equipment, or corresponding equipment is added on the basis of the scheme. Meanwhile, process layer equipment interacting with line protection, such as a measurement and control unit and the like, can form a corresponding protection loop by adopting the method to realize a protection function.
The specific embodiments are given above, but the present invention is not limited to the described embodiments. The basic idea of the present invention lies in the above basic scheme, and it is obvious to those skilled in the art that no creative effort is needed to design various modified models, formulas and parameters according to the teaching of the present invention. Variations, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the invention, and still fall within the scope of the invention.
Claims (2)
1. A method for realizing a dual secondary circuit of line protection is characterized in that,
the merging unit and the intelligent terminal at the interval are in communication connection with the line protection unit to form a point-to-point connection loop;
the line protection unit, the merging unit of the interval and the intelligent terminal are all in communication connection with the process layer switch through a network to form a network connection loop;
the communication interface corresponding to the point-to-point connection loop and the communication interface corresponding to the network connection loop are physically independent from each other, and a line protection dual secondary loop is formed by the point-to-point connection loop and the network connection loop;
the point-to-point connecting loop and the network connecting loop are connected by adopting optical fiber communication to form an optical fiber point-to-point connecting loop and an optical fiber network connecting loop;
the configuration mode of the optical fiber point-to-point connection loop is as follows: a first optical port of the line protection unit is connected with the merging unit at the interval, and a second optical port is connected with the intelligent terminal;
the configuration mode of the optical fiber network connection loop is as follows: the third optical port of the line protection unit is connected with the process layer switch, and the merging unit and the intelligent terminal are respectively provided with an optical port connected with the process layer switch;
the dual secondary loop adopts the following judgment logic:
setting an abnormal mark of a current and voltage input link of the optical fiber point-to-point connection loop, if any kind of information in the optical fiber point-to-point connection loop is judged to be abnormal, inputting the current and voltage of the optical fiber point-to-point connection loop into an abnormal mark position 1 of the link, and if no abnormality exists, setting the current and voltage input link to 0;
if any kind of information in the optical fiber network connection loop is judged to be abnormal, inputting the current and voltage of the optical fiber network connection loop into a link abnormal mark position 1, and if no abnormality exists, setting the current and voltage to 0;
the dual secondary loop also employs the following decision logic:
setting an abnormal mark of an open-in open-out link of the optical fiber point-to-point connection loop, and if any kind of information in the optical fiber point-to-point connection loop is judged to be abnormal, marking the position 1 of the abnormal mark of the open-in open-out link of the optical fiber point-to-point connection loop;
if any type of information in the optical fiber network connection loop is judged to be abnormal, marking the position 1 of the abnormal mark of the open-in open-out link of the optical fiber network connection loop;
setting a data function priority flag bit of an optical fiber point-to-point connection loop and an optical fiber network connection loop; if the current and voltage input link of the optical fiber point-to-point connection loop is received to be abnormal or the input link and the output link are received to be abnormal and the optical fiber network connection loop is not abnormal, the priority of the data function of the optical fiber point-to-point connection loop is set to be 0 and the flag position of the data function of the optical fiber network connection loop is set to be 1;
if the current and voltage input link of the optical fiber network connection loop is received to be abnormal or the input link and the output link are received to be abnormal and the optical fiber point-to-point connection loop is not abnormal, the priority of the data function of the optical fiber network connection loop is set to be 0 and the flag position of the data function priority of the optical fiber point-to-point connection loop is set to be 1.
2. The line protection dual secondary circuit implementation method of claim 1, wherein if the priority of the data function of the fiber point-to-point connection loop is 1 and the priority of the data function of the fiber network connection loop is 0, the line protection unit implements data input and output only by using the fiber point-to-point connection loop, and implements a protection function without using the fiber network connection loop; if the priority of the data function of the optical fiber point-to-point connection loop is 0 and the priority of the data function of the optical fiber network connection loop is 1, the line protection unit only adopts the optical fiber network connection loop to realize data input and output, and does not adopt the optical fiber point-to-point connection loop to realize the protection function.
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