CN110932243B - Double-end power supply line protection self-adaption method and system - Google Patents
Double-end power supply line protection self-adaption method and system Download PDFInfo
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- CN110932243B CN110932243B CN201911157353.1A CN201911157353A CN110932243B CN 110932243 B CN110932243 B CN 110932243B CN 201911157353 A CN201911157353 A CN 201911157353A CN 110932243 B CN110932243 B CN 110932243B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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Abstract
The invention discloses a double-end power line protection self-adaptive method and a double-end power line protection self-adaptive system, which comprise the following steps: detecting the line power flow direction of a double-end power supply line in real time; judging whether the line power flow direction changes or not; and when the power flow direction of the line changes, automatically switching a relay protection constant value area. According to the self-adaptive method and the self-adaptive system for the protection of the double-end power supply line, provided by the embodiment of the invention, the line power flow direction of the double-end power supply line is detected in real time, when the line power flow direction is judged to be changed, the switching of the power supply end is judged, and the relay protection constant value area is automatically switched at the moment, so that the self-adaptation of the line protection when the double-end power supply line switches the power supply end is realized, the operation risk of a power grid is reduced, and the whole working efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of relay protection, and particularly relates to a double-end power supply line protection self-adaption method and system.
Background
With the development of power grids and the formation of extra-high voltage high-capacity power grids, electric power brings huge power to national economy and social development, and forms one of indispensable energy sources for current social development and daily life of people. However, with the development of the times, the operation and management of the power grid have been changed profoundly, and domestic and foreign experiences show that if the power supply and utilization grid, especially the extra-high voltage grid, is not well managed, once natural and man-made faults occur, some users are powered off by light persons, and the safe operation of the power grid is threatened seriously. Therefore, the power grid management enterprise must improve the quality of power supply and electric energy and the overall efficiency of the enterprise as much as possible, strive to reduce the accident loss and the electric energy loss in the power supply process, and finally realize the strategic goals of optimal configuration and sustainable development of power grid resources.
In the operation of a 110kV power grid, a relatively special operation line, namely a 110kV double-end power supply line, exists. The 110kV double-power-end power supply line is often a connecting line between power grids and plays a very important role in the normal operation of the power grids. The double-end power supply circuit can correspond to different relay protection constant value lists under the condition of different power supply ends. Under the current technical measures, when a double-end power supply line is switched to different power supply ends, a power transformation operator is always required to go to a field line protection device to switch a relay protection constant value area, so that protection matching of the line under the condition of the power supply ends is realized.
The main defects of the prior art are that the current power grid operation requirement is higher and higher, the switching of different power supply ends of a double-end power supply circuit is more and more frequent, and under the condition, a dispatcher is required to check a relay protection constant value list under different power supply conditions and a station operator is required to switch a protection constant value area on site during each power supply end switching, so that the work efficiency is greatly reduced, and the operation risk of the power grid is increased. Since in the case of manual switching, the line needs to be powered off for a short time, during which the risk of operating the grid may increase if an accident occurs in a local grid.
Disclosure of Invention
The invention aims to provide a double-end power supply line protection self-adaption method and a double-end power supply line protection self-adaption system, which can realize that line protection can be self-adapted when a double-end power supply line changes a power supply end, so that the operation risk of a power grid is reduced, and the overall working efficiency is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, an embodiment of the present invention provides a double-ended power line protection adaptive method, including the following steps:
detecting the line power flow direction of a double-end power supply line in real time;
judging whether the line power flow direction changes or not;
and when the power flow direction of the line changes, automatically switching a relay protection constant value area.
Optionally, after determining whether the line power flow direction changes, the method further includes the following steps:
and when the power flow direction of the line is not changed, maintaining the relay protection constant value area unchanged.
Optionally, the detecting a line power flow direction of the double-ended power line in real time includes:
detecting the current direction of the double-end power supply line in real time;
the method for judging whether the line power flow direction changes comprises the following steps:
and judging whether the current direction is changed.
Optionally, the detecting the current direction of the double-ended power line in real time includes:
the current directions of the first power supply terminal and the second power supply terminal are detected in real time, respectively.
Optionally, the detecting a line power flow direction of the double-ended power line in real time includes:
detecting the power direction of the double-end power supply line in real time;
the method for judging whether the line power flow direction changes comprises the following steps:
and judging whether the power direction is changed.
Optionally, the detecting a line power flow direction of the double-ended power line in real time includes:
detecting the current direction and the power direction of the double-end power supply line in real time;
the method for judging whether the line power flow direction changes comprises the following steps:
judging whether the current direction and the power direction are changed or not;
when the line tide direction changes, the relay protection constant value area is automatically switched, and the method comprises the following steps:
and when the current direction and the power direction are changed, automatically switching a relay protection constant value area.
Optionally, the two-terminal power line protection adaptive method further comprises the following steps:
a first relay protection setting area and a second relay protection setting area for automatic switching are stored.
In a second aspect, an embodiment of the present invention further provides a dual-ended power line protection adaptive system, including:
the detection device is used for detecting the line power flow direction of the double-end power supply line in real time;
the judging device is used for judging whether the line tide direction changes or not;
and the switching device is used for automatically switching the relay protection constant value area when the power flow direction of the line changes.
Optionally, the detection device includes:
the current direction detection unit is used for detecting the current direction of the double-end power supply line in real time;
and the power direction detection unit is used for detecting the power direction of the double-end power supply line in real time.
Optionally, the two-terminal power line protection adaptive system further comprises:
and the storage unit is used for storing a first relay protection constant value area and a second relay protection constant value area for the automatic switching of the switching device.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
according to the self-adaptive method and the self-adaptive system for the protection of the double-end power supply line, provided by the embodiment of the invention, the line power flow direction of the double-end power supply line is detected in real time, when the line power flow direction is judged to be changed, the switching of the power supply end is judged, and the relay protection constant value area is automatically switched at the moment, so that the self-adaptation of the line protection when the double-end power supply line switches the power supply end is realized, the operation risk of a power grid is reduced, and the whole working efficiency is improved.
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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the present invention, and do not limit the conditions for implementing the present invention, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the functions and purposes of the present invention, should still fall within the scope covered by the contents disclosed in the present invention.
Fig. 1 is a flowchart of a dual-ended power line protection adaptive method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Please refer to fig. 1.
The embodiment provides a double-end power supply line protection self-adaption method, which can realize self-adaption of line protection when a double-end power supply line is changed into a power supply end, so that the operation risk of a power grid is reduced, and the overall working efficiency is improved.
A double-ended power line refers to a high-voltage power transmission line with power supplies on both sides of the line, and is generally used as a tie line between a power grid and an electric power grid. In this embodiment, the two-terminal power supply is denoted as terminal a and terminal B, respectively.
In the double-end power supply line, when power is supplied to the terminal B from the terminal A, the relay protection device is suitable for a first relay protection constant value area; when the terminal B supplies power to the terminal A, the relay protection device is suitable for the second relay protection constant value area. The power supply from the terminal a to the terminal B is not limited to the power generation from the terminal a to the terminal B, and may be supplied to the terminal a via another line and then supplied to the terminal B. Similarly, the terminal B supplies power to the terminal a, and is not limited to the terminal B generating power to supply power to the terminal a, and it is also possible that other lines supply power to the terminal B and then supply power to the terminal a.
When switching between two situations, namely power supply from the A end to the B end and power supply from the B end to the A end (namely power end switching), the line power flow direction on the double-end power supply line can be changed. Therefore, whether the power supply end is cut off or not is judged by detecting the line power flow direction.
Specifically, the double-end power supply line protection self-adaptive method comprises the following steps:
detecting the line power flow direction of a double-end power supply line in real time;
judging whether the line power flow direction changes or not;
when the power flow direction of the line changes, a relay protection constant value area is automatically switched; and when the power flow direction of the line is not changed, maintaining the relay protection constant value area unchanged.
According to power supply and distribution knowledge, line current direction changes are manifested in current direction changes and power direction changes. Therefore, the method for detecting the line power flow direction of the double-end power supply line in real time comprises the following steps:
the current direction and the power direction of the double-ended power supply line are detected in real time.
The change of the current direction and/or the change of the power direction can be used for judging whether the line power flow direction changes or not, namely judging whether the power end switching occurs or not.
Therefore, the determination condition may be any one of a manner of selecting a current direction, a power direction, a current direction, and a power direction.
When the current direction and the power direction are selected to be jointly judged, the misjudgment and the misoperation are prevented, namely, when the current direction and the power direction are changed, the relay protection constant value area is automatically switched.
Further, the real-time detection of the current direction of the double-ended power line comprises the following steps:
the current directions of the first power supply terminal and the second power supply terminal are detected in real time, respectively. Since the current direction may deviate (i.e., opposite to the actual direction) when the line fails, the current directions of the first power supply terminal (i.e., terminal a) and the second power supply terminal (i.e., terminal B) are detected simultaneously, thereby preventing erroneous judgment and malfunction.
Further, the self-adaptive method for protecting the double-end power supply line further comprises the following steps:
a first relay protection setting area and a second relay protection setting area for automatic switching are stored.
When power is supplied through the A end, a double-end power supply circuit adopts a first relay protection constant value area; when power is supplied through the B end, the double-end power supply circuit adopts a second relay protection constant value area.
Therefore, when the power supply ends are switched, the switching relay protection constant value area is the switching between the first relay protection constant value area and the second relay protection constant value area.
According to the self-adaptive method for protecting the double-end power supply line, the line power flow direction of the double-end power supply line is detected in real time, when the line power flow direction is judged to change, the power supply end is judged to be switched, the relay protection constant value area is automatically switched, and the self-adaptation of line protection when the double-end power supply line switches the power supply end is realized, so that the operation risk of a power grid is reduced, and the overall working efficiency is improved.
In another embodiment of the present application, a dual-ended power line protection adaptive system is also provided for implementing the above adaptive method.
This bi-polar power supply line protection adaptive system includes:
and the storage unit is used for storing the first relay protection constant value area and the second relay protection constant value area for the automatic switching of the switching device.
The detection device is used for detecting the line power flow direction of the double-end power supply line in real time;
the judging device is used for judging whether the line tide direction changes or not;
and the switching device is used for automatically switching the relay protection constant value area when the power flow direction of the line changes.
Specifically, the detection device includes:
the current direction detection unit is used for detecting the current direction of the double-end power supply line in real time;
and the power direction detection unit is used for detecting the power direction of the double-end power supply line in real time.
In summary, according to the self-adaptive method and system for protecting the double-end power supply line provided by the embodiments of the present invention, the line power flow direction of the double-end power supply line is detected in real time, and when it is determined that the line power flow direction changes, the relay protection constant value area is automatically switched, so that the operation risk of the power grid is reduced and the overall working efficiency is improved.
The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are intended to be inclusive and therefore specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order discussed and illustrated, unless explicitly indicated as an order of performance. It should also be understood that additional or alternative steps may be employed.
When an element or layer is referred to as being "on" … … "," engaged with "… …", "connected to" or "coupled to" another element or layer, it can be directly on, engaged with, connected to or coupled to the other element or layer, or intervening elements or layers may also be present. In contrast, when an element or layer is referred to as being "directly on … …," "directly engaged with … …," "directly connected to" or "directly coupled to" another element or layer, there may be no intervening elements or layers present. Other words used to describe the relationship of elements should be interpreted in a similar manner (e.g., "between … …" and "directly between … …", "adjacent" and "directly adjacent", etc.). As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region or section from another element, component, region or section. Unless clearly indicated by the context, use of terms such as the terms "first," "second," and other numerical values herein does not imply a sequence or order. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
Spatially relative terms, such as "inner," "outer," "below," "… …," "lower," "above," "upper," and the like, may be used herein for ease of description to describe a relationship between one element or feature and one or more other elements or features as illustrated in the figures. Spatially relative terms may be intended to encompass different orientations of the device in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the example term "below … …" can encompass both an orientation of facing upward and downward. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (3)
1. A double-end power line protection self-adaptive method is characterized by comprising the following steps:
detecting the line power flow direction of a double-end power supply line in real time;
judging whether the line power flow direction changes or not;
when the power flow direction of the line changes, a relay protection constant value area is automatically switched;
the method for detecting the line power flow direction of the double-end power supply line in real time comprises the following steps:
detecting the current direction and the power direction of the double-end power supply line in real time;
the method for judging whether the line power flow direction changes comprises the following steps:
judging whether the current direction and the power direction are changed or not;
when the line tide direction changes, the relay protection constant value area is automatically switched, and the method comprises the following steps:
and when the current direction and the power direction are changed, automatically switching a relay protection constant value area.
2. The adaptive method for dual-ended power line protection according to claim 1, wherein after determining whether the line current direction has changed, further comprising the steps of:
and when the power flow direction of the line is not changed, maintaining the relay protection constant value area unchanged.
3. The adaptive method for dual-ended power line protection according to claim 1, further comprising the steps of:
a first relay protection setting area and a second relay protection setting area for automatic switching are stored.
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