CN110994610A - Monitoring information assistance-based loop closing method and device for power distribution network line - Google Patents
Monitoring information assistance-based loop closing method and device for power distribution network line Download PDFInfo
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- CN110994610A CN110994610A CN201911346970.6A CN201911346970A CN110994610A CN 110994610 A CN110994610 A CN 110994610A CN 201911346970 A CN201911346970 A CN 201911346970A CN 110994610 A CN110994610 A CN 110994610A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 27
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- 230000002159 abnormal effect Effects 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
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- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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Abstract
The invention provides a monitoring information assistance-based loop closing method and device for a power distribution network line, which belong to the technical field of power distribution monitoring and comprise the following steps: constructing a power grid network topology and constructing a power grid equivalent circuit based on the power grid network topology; constructing a power grid equivalent circuit based on a power grid, and carrying out load flow calculation on the power grid to obtain a side A circuit loop closing current and a side B circuit loop closing current; judging whether the A-side circuit and the B-side circuit meet a first loop closing condition or not based on the A-side loop closing current and the B-side loop closing current; if yes, obtaining side A circuit monitoring information and side B circuit monitoring information, and judging whether the side A circuit and the side B circuit meet a second loop closing condition or not based on the side A circuit monitoring information and the side B circuit monitoring; if not, alarm information is sent. The method provided by the invention can perform the load reversing work under the condition of no power failure, and improves the reliability of the power distribution system.
Description
Technical Field
The invention relates to the technical field of power distribution monitoring, in particular to a power distribution network circuit loop closing method and device based on monitoring information assistance.
Background
Along with the 10kV distribution network structure is more and more complicated, contact between each line is more and more, and the inter-line contact is taken the ability and is promoted by a wide margin. At present, in the running and overhauling process of a power grid, 10kV load reversing operation is often needed. The conditions for carrying out the closed-loop reverse operation of the 10kV power distribution network are as follows: the transformer substation power supply from the same subarea or the transformer substation power supply which can be adjusted to the same subarea needs to be powered off due to the influence of closed loop current when two 10kV lines of outgoing lines of transformer substations which are not in the same subarea are subjected to load shedding operation. With the development of society, people have higher and higher requirements on power supply reliability, and the influence on users caused by power failure and load shedding is larger and larger.
Therefore, in the prior art, how to perform the load reversing work without power failure.
Disclosure of Invention
In view of the above, the present invention provides a monitoring information-based loop closing method and apparatus for a power distribution network line, so as to alleviate the operation of load shedding under the condition of no power outage, and improve the reliability of power supply and distribution of a power grid.
In a first aspect, an embodiment of the present invention provides a monitoring information assistance-based loop closing method for a power distribution network line, which specifically includes the following steps:
constructing a power grid network topology and constructing a power grid equivalent circuit based on the power grid network topology;
constructing a power grid equivalent circuit based on a power grid, and carrying out load flow calculation on the power grid to obtain a side A circuit loop closing current and a side B circuit loop closing current;
determining whether the A-side circuit and the B-side circuit meet a first loop closing condition based on the A-side loop closing current and the B-side loop closing current;
if yes, obtaining side A circuit monitoring information and side B circuit monitoring information, and judging whether the side A circuit and the side B circuit meet a second loop closing condition or not based on the side A circuit monitoring information and the side B circuit monitoring;
if not, alarm information is sent.
Preferably, the determining whether the a-side circuit and the B-side circuit satisfy the first loop-closing condition based on the a-side and loop currents and the B-side and loop currents includes:
the determining whether the a-side circuit and the B-side circuit satisfy a first loop-closing condition based on the a-side and loop currents and the B-side and loop currents comprises:
acquiring the A-side loop closing current, the B-side loop closing current, the minimum current allowed to pass by an A-side circuit element and the minimum current allowed to pass by a B-side circuit element;
if the A-side loop-back current is less than the minimum current allowed to pass by the A-side circuit element and the B-side loop-back current is less than the minimum current allowed to pass by the B-side circuit element, the first loop-back condition is satisfied;
if the a-side loop-closing current is greater than the minimum current allowed to pass by the a-side circuit element and/or the B-side loop-closing current is greater than the minimum current allowed to pass by the B-side circuit element, the first loop-closing condition is not satisfied.
Preferably, the a-side circuit monitoring information includes at least one of a-side circuit switch state information, an a-side circuit current value, an a-side circuit voltage value, and a-side abnormality information;
the B-side circuit monitoring information comprises at least one of B-side circuit switch state information, B-side circuit current value, B-side circuit voltage value and B-side abnormal information.
On the other hand, the invention provides a monitoring information assistance-based loop closing device for a power distribution network line, which comprises the following steps:
a circuit construction module: the power grid equivalent circuit is used for constructing a power grid network topology and constructing a power grid equivalent circuit based on the power grid network topology;
a loop closing current obtaining module: the method comprises the steps of constructing a power grid equivalent circuit based on a power grid, and carrying out load flow calculation on the power grid to obtain a side A circuit loop closing current and a side B circuit loop closing current;
a determination module: and the control circuit is used for judging whether the A-side circuit and the B-side circuit meet a first loop closing condition or not based on the A-side loop closing current and the B-side loop closing current.
The embodiment of the invention has the following beneficial effects: the invention provides a monitoring information assistance-based loop closing method and device for a power distribution network line, wherein the method comprises the following steps: constructing a power grid network topology and constructing a power grid equivalent circuit based on the power grid network topology; constructing a power grid equivalent circuit based on a power grid, and carrying out load flow calculation on the power grid to obtain a side A circuit loop closing current and a side B circuit loop closing current; judging whether the A-side circuit and the B-side circuit meet a first loop closing condition or not based on the A-side loop closing current and the B-side loop closing current; if yes, obtaining side A circuit monitoring information and side B circuit monitoring information, and judging whether the side A circuit and the side B circuit meet a second loop closing condition or not based on the side A circuit monitoring information and the side B circuit monitoring; if not, alarm information is sent. The method provided by the invention can perform the load reversing work under the condition of no power failure, and improves the reliability of the power distribution system.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a loop closing method for a power distribution network line based on monitoring information assistance according to an embodiment of the present invention;
fig. 2 is a flowchart of another loop closing method for a power distribution network line based on monitoring information assistance according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
At present, due to the influence of closed-loop current in a power distribution grid, a power distribution system needs to be cut off in the operation of load shedding, and the reliability of a power supply system is seriously influenced.
In order to facilitate understanding of the embodiment, a detailed description is first given to a loop closing method for a power distribution network line based on monitoring information assistance, which is disclosed in the embodiment of the present invention.
The first embodiment is as follows:
as shown in fig. 1, the present invention provides a monitoring information assistance-based loop closing method for a power distribution network, which specifically includes the following steps:
constructing a power grid network topology and constructing a power grid equivalent circuit based on the power grid network topology;
specifically, in the embodiment provided by the invention, the power grid network topology is simplified by adopting a circuit superposition principle to obtain a power grid equivalent circuit;
furthermore, the calculation of the superposition theorem does not need to perform load flow calculation after loop closing, the magnitude of the loop closing current can be calculated directly from the load flow calculation result before loop closing, and the method adopts the principle of engineering: the default ring network impedance is formed by the sum of the loop closing transformer and the line impedance below the loop closing transformer, if accurate ring network impedance is to be obtained, network equivalence must be carried out, but the network equivalence is very complex and is not easy to realize, so that the current after loop closing is obtained by adopting a circuit superposition principle in engineering calculation;
constructing a power grid equivalent circuit based on a power grid, and carrying out load flow calculation on the power grid to obtain a side A circuit loop closing current and a side B circuit loop closing current;
determining whether the A-side circuit and the B-side circuit meet a first loop closing condition based on the A-side loop closing current and the B-side loop closing current;
as shown in fig. 2, to determine whether the first condition is satisfied, the method specifically includes the following steps:
acquiring the A-side loop closing current, the B-side loop closing current, the minimum current allowed to pass by an A-side circuit element and the minimum current allowed to pass by a B-side circuit element;
if the A-side loop-closing current is less than the minimum current allowed to pass by the A-side circuit element and the minimum current allowed to pass by the B-side circuit element, the first loop-closing condition is satisfied;
in engineering practice, the engineering needs often need to design a current margin, and in the embodiment provided by the invention, 20% of the engineering margin needs to be reserved;
the first loop-back condition is not satisfied if the A-side loop-back current is greater than a minimum current allowed to pass by the A-side circuit element and/or the B-side loop-back current is greater than a minimum current allowed to pass by the B-side circuit element.
If the first loop closing condition is met, acquiring side A circuit monitoring information and side B circuit monitoring information, and judging whether a side A circuit and a side B circuit meet a second loop closing condition or not based on the side A circuit monitoring information and the side B circuit monitoring;
if the first loop closing condition is not met, sending alarm information;
further, the a-side circuit monitoring information includes at least one of a-side circuit switch state information, an a-side circuit current value, an a-side circuit voltage value and a-side abnormal information;
the B-side circuit monitoring information comprises at least one of B-side circuit switch state information, B-side circuit current value, B-side circuit voltage value and B-side abnormal information;
it should be noted that, in the embodiment of the present invention, the a-side circuit current value, the a-side circuit voltage value, the B-side circuit current value, and the B-side circuit voltage value are all real-time monitoring values, if the second loop closing condition is to be satisfied, the a-side circuit current value is required to be smaller than the minimum current allowed to pass through by the a-side circuit element, the a-side circuit voltage value is required to be smaller than the minimum voltage allowed to pass through by the a-side circuit element, the B-side circuit current value is smaller than the minimum current allowed to pass through by the B-side circuit element, the B-side circuit voltage value is smaller than the minimum voltage allowed to pass through by the B-side circuit element, and both the a-side;
and if the second loop closing condition is not met, sending alarm information.
Example two:
in the embodiment of the invention, PSD software is adopted to perform simulation calculation and an SCADA system is used for monitoring, wherein the first table is the information of an A-side circuit, the second table is the information of a B-side circuit, the third table is the through current and the short-circuit current flowing from the A-side circuit to the B-side circuit, and the information obtained from the first table, the second table and the third table is combined to obtain whether the A-side circuit and the B-side circuit meet the loop closing condition or not.
Table one: circuit information of A side
Table two: b-side circuit information
Table three: through current and short circuit current flowing from A side circuit to B side circuit
Example three:
the third embodiment of the present invention provides a monitoring information assistance-based loop closing device for a power distribution network line, which specifically includes:
a circuit construction module: the power grid equivalent circuit is used for constructing a power grid network topology and constructing a power grid equivalent circuit based on the power grid network topology;
a loop closing current obtaining module: the method comprises the steps of constructing a power grid equivalent circuit based on a power grid, and carrying out load flow calculation on the power grid to obtain a side A circuit loop closing current and a side B circuit loop closing current;
a determination module: and the control circuit is used for judging whether the A-side circuit and the B-side circuit meet a first loop closing condition or not based on the A-side loop closing current and the B-side loop closing current.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the system and the apparatus described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. A loop closing method of a power distribution network line based on monitoring information assistance is characterized by comprising the following steps:
constructing a power grid network topology and constructing a power grid equivalent circuit based on the power grid network topology;
constructing a power grid equivalent circuit based on a power grid, and carrying out load flow calculation on the power grid to obtain a side A circuit loop closing current and a side B circuit loop closing current;
determining whether the A-side circuit and the B-side circuit meet a first loop closing condition based on the A-side loop closing current and the B-side loop closing current;
if yes, obtaining side A circuit monitoring information and side B circuit monitoring information, and judging whether the side A circuit and the side B circuit meet a second loop closing condition or not based on the side A circuit monitoring information and the side B circuit monitoring;
if not, alarm information is sent.
2. The method of claim 1, wherein said determining whether the a-side circuit and the B-side circuit satisfy a first loop-closing condition based on the a-side and loop currents and the B-side and loop currents comprises:
acquiring the A-side loop closing current, the B-side loop closing current, the minimum current allowed to pass by an A-side circuit element and the minimum current allowed to pass by a B-side circuit element;
if the A-side loop-back current is less than the minimum current allowed to pass by the A-side circuit element and the B-side loop-back current is less than the minimum current allowed to pass by the B-side circuit element, the first loop-back condition is satisfied;
if the a-side loop-closing current is greater than the minimum current allowed to pass by the a-side circuit element and/or the B-side loop-closing current is greater than the minimum current allowed to pass by the B-side circuit element, the first loop-closing condition is not satisfied.
3. The method of claim 1, wherein the a-side circuit monitoring information includes at least one of a-side circuit switch state information, a-side circuit current values, a-side circuit voltage values, and a-side anomaly information;
the B-side circuit monitoring information comprises at least one of B-side circuit switch state information, B-side circuit current value, B-side circuit voltage value and B-side abnormal information.
4. The utility model provides a join in marriage ring device of circuit of distribution based on monitoring information is supplementary which characterized in that includes:
a circuit construction module: the power grid equivalent circuit is used for constructing a power grid network topology and constructing a power grid equivalent circuit based on the power grid network topology;
a loop closing current obtaining module: the method comprises the steps of constructing a power grid equivalent circuit based on a power grid, and carrying out load flow calculation on the power grid to obtain a side A circuit loop closing current and a side B circuit loop closing current;
a determination module: and the control circuit is used for judging whether the A-side circuit and the B-side circuit meet a first loop closing condition or not based on the A-side loop closing current and the B-side loop closing current.
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Application publication date: 20200410 |