CN118137433A - Reverse-flow prevention protection method and device for transformer substation, control equipment and storage medium - Google Patents
Reverse-flow prevention protection method and device for transformer substation, control equipment and storage medium Download PDFInfo
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- CN118137433A CN118137433A CN202410297169.1A CN202410297169A CN118137433A CN 118137433 A CN118137433 A CN 118137433A CN 202410297169 A CN202410297169 A CN 202410297169A CN 118137433 A CN118137433 A CN 118137433A
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Abstract
The application is suitable for the technical field of power and provides a reverse-flow prevention protection method, device, control equipment and storage medium of a transformer substation. The anti-reflux protection method of the transformer substation is applied to control equipment of the transformer substation, and comprises the following steps: determining, for each power source connected to the target bus, a first direction of flow between the power source and the line of the target bus; the target bus is a bus connected with a main power grid in the transformer substation; and if the first tide direction is the direction from the power supply to the target bus, performing disconnection control on the power supply. By the method, the control equipment arranged on the transformer substation can be used for preventing the transformer substation from countercurrent, and the countercurrent preventing function is not required to be added to each distribution transformer of the transformer substation, so that the countercurrent preventing cost of the transformer substation is reduced.
Description
Technical Field
The application belongs to the technical field of electric power, and particularly relates to a reverse-flow prevention protection method, device, control equipment and storage medium of a transformer substation.
Background
The substation is typically connected to a plurality of power sources, which, for each power source connected to the substation, when the power source outputs a power greater than the corresponding load power of the power source, generate surplus power, which surplus power needs to be incorporated into the main grid through the substation. For safety reasons, the surplus energy of the power supply is not allowed to be incorporated into the main grid in some cases, which requires a transformer substation for protection against reverse currents.
At present, the problem is usually solved by adding a backflow prevention function to each distribution transformer of a transformer substation, and the cost of adding the backflow prevention function to each distribution transformer of the transformer substation is high, so that the backflow prevention cost of the existing transformer substation is high.
Disclosure of Invention
In view of the above, the embodiment of the application provides a method, a device, a control device and a storage medium for protecting a transformer substation against reverse flow, so as to solve the technical problem of high cost of the existing transformer substation against reverse flow protection.
In a first aspect, an embodiment of the present application provides an anti-backflow protection method for a substation, which is applied to a control device of the substation, and the method includes:
Determining, for each power source connected to a target bus, a first direction of flow between the power source and a line of the target bus; the target bus is a bus connected with a main power grid in the transformer substation;
and if the first tide direction is the direction from the power supply to the target bus, performing disconnection control on the power supply.
Optionally, the determining the first power flow direction between the power supply and the line of the target bus includes:
Acquiring three-phase voltages of the target bus;
acquiring three-phase protection current of a first circuit breaker connected with the target bus in a circuit between the power supply and the target bus;
And determining the first power flow direction according to the three-phase voltage and the three-phase protection current of the first circuit breaker.
Optionally, the splitting control of the power supply includes:
And controlling the first breaker connected with the target bus to trip in a line between the power supply and the target bus.
Optionally, the method further comprises:
Determining a second tide direction between the target bus and a line of the main power grid;
And if the second tide direction is the direction pointing to the main power grid from the target bus, performing disconnection control on all power supplies connected with the target bus.
Optionally, the determining the second power flow direction between the target bus and the line of the main power grid includes:
Acquiring three-phase voltages of the target bus;
acquiring three-phase protection current of a second circuit breaker connected with the target bus in a circuit between the target bus and the main power grid;
And determining the second power flow direction according to the three-phase voltage and the three-phase protection current of the second circuit breaker.
Optionally, the splitting control of all power sources connected to the target bus includes:
for each power source connected to the target bus, controlling a first circuit breaker in a line between the power source and the target bus to trip.
Optionally, if the first power flow direction is a direction from the power supply to the target bus, performing disconnection control on the power supply, including:
determining whether bus PT disconnection or bus frequency abnormality occurs in the target bus;
And if the bus PT disconnection and bus frequency abnormality do not occur in the target bus, and the first power flow direction is the direction from the power supply to the target bus, performing disconnection control on the power supply.
In a second aspect, an embodiment of the present application provides an anti-backflow protection device of a substation, applied to a control device of the substation, where the device includes:
A power flow direction determining unit configured to determine, for each power supply connected to a target bus, a first power flow direction between the power supply and a line of the target bus; the target bus is a bus connected with a main power grid in the transformer substation;
and the disconnection control unit is used for performing disconnection control on the power supply if the first power flow direction is the direction from the power supply to the target bus.
In a third aspect, an embodiment of the present application provides a control device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor implementing the steps in the anti-reflux protection of a substation according to any one of the first aspects when the computer program is executed.
In a fourth aspect, an embodiment of the present application provides a computer readable storage medium storing a computer program, which when executed by a processor implements the steps in the method for protecting a substation against reverse current according to any one of the first aspect.
In a fifth aspect, embodiments of the present application provide a computer program product, which, when run on a terminal device, causes the terminal device to perform the steps in the anti-reverse-flow protection of a substation as described in any of the first aspects above.
The anti-countercurrent protection method, the device, the control equipment and the storage medium for the transformer substation provided by the embodiment of the application have the following beneficial effects:
In the anti-backflow protection method for the transformer substation provided by the embodiment of the application, a first tide direction between a power supply and a line of a target bus is determined for each power supply connected with the target bus through control equipment of the transformer substation, and then disconnection control is performed on the power supply if the first tide direction is the direction from the power supply to the target bus. According to the anti-backflow protection method of the transformer substation, the first power flow direction between each power supply connected with the target bus and the line of the target bus can be obtained through the control equipment arranged in the transformer substation, and the corresponding power supply with the first power flow direction being the direction from the power supply to the target bus is subjected to disconnection control, so that the anti-backflow protection of the transformer substation can be realized only by arranging the control equipment in the transformer substation, and the anti-backflow protection function is not required to be added in each distribution transformer of the transformer substation, so that the anti-backflow protection cost of the transformer substation is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of an implementation of a method for protecting a transformer substation against reverse current according to an embodiment of the present application;
Fig. 2 is a schematic structural diagram of a transformer substation according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of another transformer substation according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of an anti-countercurrent protection device of a transformer substation according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a control device according to an embodiment of the present application.
Detailed Description
It is to be understood that the terminology used in the embodiments of the application is for the purpose of describing particular embodiments of the application only, and is not intended to be limiting of the application. In the description of the embodiments of the present application, unless otherwise indicated, "a plurality" means two or more, and "at least one", "one or more" means one, two or more. The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a definition of "a first", "a second" feature may explicitly or implicitly include one or more of such features.
Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.
The execution main body of the anti-backflow protection method of the transformer substation provided by the embodiment of the application can be control equipment. The control device can be arranged in the transformer substation and can execute each step of the anti-backflow protection method of the transformer substation provided by the embodiment of the application.
Specifically, when the anti-reverse-flow protection is required to be performed on the transformer substation, control equipment capable of executing each step of the anti-reverse-flow protection method of the transformer substation provided by the embodiment of the application can be arranged in the transformer substation, so that the anti-reverse-flow protection can be performed on the transformer substation through the control equipment arranged in the transformer substation.
Referring to fig. 1, fig. 1 is a flowchart illustrating an implementation of a method for protecting a transformer substation against reverse current according to an embodiment of the present application, where the method for protecting a transformer substation against reverse current may include S101 to S102, which are described in detail as follows:
in S101, for each power source connected to the target bus, a first direction of flow between the power source and the line of the target bus is determined.
The target bus is a bus connected with a main power grid in the transformer substation.
In the embodiment of the application, when the transformer substation needs to be protected against reverse current, the control equipment can determine the first tide direction between the power supply and the line of the target bus for each power supply connected with the target bus.
Wherein the first direction of flow of power between the power source and the line of the target bus may include a direction from the power source to the target bus and a direction from the target bus to the power source.
When the first power flow direction between the power supply and the line of the target bus is the direction that the power supply points to the target bus, the output power of the power supply is larger than the corresponding load power of the power supply, and the power supply generates residual electric energy which can cause potential safety hazards when being merged into the main power grid through the transformer substation, so that the transformer substation needs to be protected against reverse flow so as to avoid that the residual electric energy of the power supply is merged into the main power grid through the transformer substation.
When the first power flow direction between the power supply and the line of the target bus is the direction that the target bus points to the power supply, the output power of the power supply is smaller than the load power corresponding to the power supply, the power supply does not generate residual electric energy, and no backflow prevention protection is needed.
In one possible implementation, the first direction of flow between the power supply and the line of the target bus may be determined by steps a to c. The details are as follows:
In step a, three-phase voltages of the target bus are acquired.
In this implementation manner, the control device may collect the three-phase voltage of the target bus through a preset voltage collecting device.
For example, the three-phase voltages of the target bus may be UA, UB, and UC, respectively.
In step b, three-phase protection currents of a first circuit breaker connected with the target bus bar in a line between the power supply and the target bus bar are acquired.
In the implementation mode, a plurality of circuit breakers are arranged in the circuit between the power supply and the target bus, and the plurality of circuit breakers comprise first circuit breakers connected with the target bus.
Based on the above, the control device may collect three-phase protection current of the first circuit breaker connected to the target bus in the line between the power supply and the target bus through the preset current collection device.
For example, the three-phase protection currents of the first circuit breaker may be IA, IB, and IC, respectively.
In step c, a first power flow direction is determined from the three-phase voltages and the three-phase protection currents of the first circuit breaker.
In this implementation manner, after the control device obtains the three-phase voltage of the target bus and the three-phase protection current of the first circuit breaker, the control device may determine the first power flow direction according to the three-phase voltage and the three-phase protection current of the first circuit breaker.
Specifically, the active power P of the line between the power supply and the target bus may be determined according to the three-phase voltage and the three-phase protection current of the first circuit breaker by the following formula:
P＝UA*IA+UB*IB+UC*IC；
After determining the active power P of the line of the power supply and the target bus, the first power flow direction may be determined according to the direction of P.
In practical application, the positive direction of the three-phase protection current, the positive direction of the active power P of the line and the positive direction of the first tide direction can be set as the direction that the power supply points to the target bus. Based on this, if the determined active power P of the line of the power source and the target bus is positive, the first power flow direction may be determined as the direction in which the power source is directed to the target bus, and if the determined active power P of the line of the power source and the target bus is negative, the first power flow direction may be determined as the direction in which the target bus is directed to the power source.
In practical application, the positive direction of the three-phase protection current, the positive direction of the active power P of the line and the positive direction of the first tide direction can be set as the direction that the target bus points to the power supply. Based on this, if the determined active power P of the line of the power source and the target bus is positive, the first power flow direction may be determined as the direction in which the target bus points to the power source, and if the determined active power P of the line of the power source and the target bus is negative, the first power flow direction may be determined as the direction in which the power source points to the target bus.
In S102, if the first power flow direction is a direction from the power supply to the target bus, the disconnection control is performed on the power supply.
In the embodiment of the application, after determining the first power flow direction between each power supply and the line of the target bus, the control device may perform disconnection control on the power supply if the first power flow direction of a certain power supply is the direction from the power supply to the target bus.
In one possible implementation, when it is determined that the first power flow direction of a certain power source is a direction from the power source to the target bus, a first circuit breaker connected to the target bus may be controlled to trip in a line between the power source and the target bus.
In practical application, the target bus of the transformer substation may have a bus voltage transformer (Potential Transformer, PT) disconnection and a bus frequency abnormality, and when the bus PT disconnection or the bus frequency abnormality occurs, the control device may determine that the first tide direction is misjudged.
Based on this, in one possible implementation manner, the control device may determine whether the target bus is disconnected with the bus PT or the bus frequency is abnormal, and if the bus is not disconnected with the bus PT and the bus frequency is abnormal, and the first power flow direction is a direction from the power supply to the target bus, then the disconnection control is performed on the power supply.
In practical application, the control device can also detect whether the target bus works normally, and if the bus works abnormally, the control device controls a third breaker connected with the power supply to trip in the circuit between each power supply and the target bus. Specifically, when the overvoltage, the low voltage, the low frequency, the high frequency and the zero sequence overvoltage of the target bus are detected, the abnormal operation of the target bus can be determined.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a transformer substation according to an embodiment of the present application. The following describes in detail an anti-backflow protection method for a transformer substation according to an embodiment of the present application with reference to fig. 2.
In the transformer substation shown in fig. 2, since the 10kV bus of the transformer substation is a bus connected with the main power grid in the transformer substation, the 10kV bus of the transformer substation is a target bus in the anti-backflow protection method of the transformer substation provided by the embodiment of the application.
In the substation shown in fig. 2, taking a line between the power source 1 and the substation 10kV bus as an example, the circuit breaker 2DL is a first circuit breaker connected to the substation 10kV bus in the line between the power source 1 and the substation 10kV bus. Based on this, the breaker 3DL is the first breaker connected to the substation 10kV bus in the line between the power supply 2 and the substation 10kV bus, and so on.
The control device can acquire three-phase voltages of the 10kV buses of the transformer substation and three-phase protection currents of the circuit breaker 2DL, the circuit breaker 3DL, the circuit breaker 4DL and the circuit breaker 5DL, and respectively determine a first power flow direction between the power supply 1 and the circuit of the 10kV buses of the transformer substation, a first power flow direction between the power supply 2 and the circuit of the 10kV buses of the transformer substation, a first power flow direction between the power supply 3 and the circuit of the 10kV buses of the transformer substation and a first power flow direction between the power supply 4 and the circuit of the 10kV buses of the transformer substation according to the three-phase voltages of the 10kV buses and the three-phase protection currents of the circuit breaker 2DL, the circuit breaker 3DL, the circuit breaker 4DL and the circuit breaker 5 DL.
In addition, the control equipment can also determine whether the bus PT of the 10kV bus of the transformer substation is broken or the frequency of the bus is abnormal.
After determining the first power flow direction between each power supply and the target bus, if the first power flow direction between a certain power supply and the target bus is the direction that the power supply points to the target bus, and it is determined that the bus PT disconnection or the bus frequency abnormality does not occur in the 10kV bus of the transformer substation, the control device controls the first circuit breaker corresponding to the power supply to trip. For example, if the first power flow direction between the power supply 1 and the line of the 10kV bus of the transformer substation is the direction in which the power supply 1 points to the 10kV bus of the transformer substation, and it is determined that the 10kV bus of the transformer substation has no occurrence of the disconnection of the bus PT or the abnormal frequency of the bus, the control device may control the circuit breaker 2DL to trip.
In addition, the control device can also detect whether the 10kV bus of the transformer substation works normally, and if the 10kV bus of the transformer substation works abnormally, the control device can control the breaker 6DL, the breaker 7DL, the breaker 8DL and the breaker 9DL to trip.
In some embodiments, the method for protecting a transformer substation against reverse current provided by the embodiments of the present application may further include S103 to S104. The details are as follows:
In S103, a second direction of flow between the target bus and the line of the main grid is determined.
In this embodiment, the control device may further determine a second direction of flow between the target bus and the line of the main grid.
The second direction of flow between the target bus and the line of the main grid may include a direction in which the target bus points to the main grid and a direction in which the main grid points to the target bus.
In one possible implementation, the second direction of flow between the target bus and the line of the main grid may be determined by steps d to f. The details are as follows:
in step d, three-phase voltages of the target bus are acquired.
In this implementation manner, the control device may collect the three-phase voltage of the target bus through a preset voltage collecting device.
In step e, three-phase protection current of a second circuit breaker connected with the target bus bar in a line between the target bus bar and the main power grid is obtained.
In the implementation manner, the control device can collect three-phase protection current of the second circuit breaker connected with the target bus in a line between the target bus and the main power grid through a preset current collection device.
In step f, a second power flow direction is determined from the three-phase voltage and the three-phase protection current of the second circuit breaker
In this implementation manner, after the control device obtains the three-phase voltage of the target bus and the three-phase protection current of the second circuit breaker, the control device may determine the second power flow direction according to the three-phase voltage and the three-phase protection current of the second circuit breaker.
The specific method for determining the second power flow direction according to the three-phase voltage and the three-phase protection current of the second circuit breaker can refer to the specific method for determining the first power flow direction according to the three-phase voltage and the three-phase protection current of the first circuit breaker. And will not be described in detail herein.
In S104, if the second power flow direction is the direction from the target bus to the main grid, all the power sources connected to the target bus are controlled to be disconnected.
In this embodiment, after determining the second power flow direction between the target bus and the line of the main power grid, if the second power flow direction is a direction from the target bus to the main power grid, the control device performs disconnection control on all the power supplies connected to the target bus.
Specifically, after determining that the second power flow direction is a direction from the target bus to the main power grid, the control device may control, for each power source connected to the target bus, the trip of the first circuit breaker in the line between the power source and the target bus.
In practical application, the bus PT of the transformer substation may be disconnected or the bus frequency is abnormal, and when the bus PT is disconnected or the bus frequency is abnormal, the control device may determine that the second tide direction is misjudged.
Based on this, in one possible implementation, the control device may determine whether the target bus is disconnected by the bus PT or the bus frequency is abnormal, and if the bus is not disconnected by the bus PT and the bus frequency is abnormal, and the second power flow direction is a direction from the target bus to the main power grid, for each power source connected to the target bus, control the first breaker in the line between the power source and the target bus to trip.
The following describes in detail an anti-backflow protection method for a transformer substation according to an embodiment of the present application with reference to fig. 2.
The control device can acquire the three-phase voltage of the 10kV bus of the transformer substation and the three-phase protection current of the breaker 1DL, and determine the second tide direction between the 10kV bus of the transformer substation and the line of the main power grid according to the three-phase voltage of the 10kV bus of the transformer substation and the three-phase protection current of the breaker 1 DL.
In addition, the control equipment can also determine whether the bus PT of the 10kV bus of the transformer substation is broken or the frequency of the bus is abnormal.
If the second trend direction between the 10kV bus of the transformer substation and the line of the main power grid is the direction that the 10kV bus of the transformer substation points to the main power grid, and it is determined that no bus PT disconnection or bus frequency abnormality occurs in the 10kV bus of the transformer substation, then for each power source (power source 1, power source 2, power source 3 and power source 4) connected with the 10kV bus of the transformer substation, a first breaker in the line between the power source and the 10kV bus of the transformer substation is controlled to trip, namely, the breaker 2DL, the breaker 3DL, the breaker 4DL and the breaker 5DL are controlled to trip.
As can be seen from the above, in the anti-backflow protection method of the transformer substation provided by the embodiment of the present application, the control device of the transformer substation first determines, for each power source connected to the target bus, a first power flow direction between the power source and the line of the target bus, and then, if the first power flow direction is a direction from the power source to the target bus, performs disconnection control on the power source. According to the anti-backflow protection method of the transformer substation, the first power flow direction between each power supply connected with the target bus and the line of the target bus can be obtained through the control equipment arranged in the transformer substation, and the corresponding power supply with the first power flow direction being the direction from the power supply to the target bus is subjected to disconnection control, so that the anti-backflow protection of the transformer substation can be realized only by arranging the control equipment in the transformer substation, and the anti-backflow protection function is not required to be added in each distribution transformer of the transformer substation, so that the anti-backflow protection cost of the transformer substation is reduced.
Referring to fig. 3, fig. 3 is a schematic structural diagram of another transformer substation according to an embodiment of the present application. The following describes in detail an anti-countercurrent protection method for a transformer substation according to an embodiment of the present application with reference to fig. 3.
Two target buses, a first substation 10kV bus and a second substation 10kV bus, may be included in the substation as shown in fig. 3. The first substation 10kV bus and the second substation 10kV bus may be connected through a circuit breaker 14 DL.
Wherein the circuit breaker 14DL may be closed or opened. When the circuit breaker 14DL is in a closed state, the first substation 10kV busbar and the second substation 10kV busbar operate in parallel; when the circuit breaker 14DL is in an open state, the first substation 10kV bus and the second substation 10kV bus are operated in a row.
The operation principle of the transformer substation when the circuit breaker 14DL is in the closed state will be described below.
When the circuit breaker 14DL is in the closed state, the control device may acquire the three-phase voltage of the first substation 10kV bus, the three-phase voltage of the second substation 10kV bus, and the three-phase protection currents of the circuit breaker 12DL, the circuit breaker 13DL, the circuit breaker 15DL, and the circuit breaker 16DL, so as to determine the first power flow direction between the power supply 5 and the line of the first substation 10kV bus, the first power flow direction between the power supply 6 and the line of the first substation 10kV bus, the first power flow direction between the power supply 7 and the line of the second substation 10kV bus, and the first power flow direction between the power supply 8 and the line of the second substation 10kV bus, respectively.
In addition, the control device can also determine whether the bus PT wire breakage or the bus frequency abnormality occurs in the first substation 10kV bus and the second substation 10kV bus.
After determining the first power flow direction between each power supply and the target bus, if the first power flow direction between a certain power supply and the target bus is the direction that the power supply points to the target bus, and it is determined that the corresponding 10kV bus of the transformer substation does not have bus PT disconnection or bus frequency abnormality, the control device controls the first circuit breaker corresponding to the power supply to trip.
For example, if the first power flow direction between the power supply 5 and the line of the 10kV bus of the first substation is the direction in which the power supply 5 points to the 10kV bus of the first substation, and it is determined that the PT disconnection or the abnormal frequency of the bus of the 10kV bus of the first substation does not occur, the control device may control the circuit breaker 12DL to trip; for example, if the first power flow direction between the power supply 7 and the line of the 10kV bus of the second substation is the direction in which the power supply 7 points to the 10kV bus of the second substation, and it is determined that the PT disconnection or the abnormal frequency of the bus of the second substation does not occur in the 10kV bus of the second substation, the control device may control the circuit breaker 15DL to trip.
The control device may further obtain three-phase protection currents of the breaker 10DL and the breaker 11DL, and determine a second current direction between the first substation 10kV bus and the line of the main power grid according to the three-phase voltage of the first substation 10kV bus and the three-phase protection current of the breaker 10DL, and determine a second current direction between the second substation 10kV bus and the line of the main power grid according to the three-phase voltage of the second substation 10kV bus and the three-phase protection current of the breaker 11 DL.
If the second power flow direction between the first substation 10kV bus and the line of the main power grid is the direction in which the first substation 10kV bus points to the main power grid, and it is determined that the bus PT disconnection or the bus frequency abnormality does not occur in the first substation 10kV bus, then the disconnection of each power supply (power supply 5, power supply 6, power supply 7 and power supply 8) in the substation is controlled, that is, the tripping of the circuit breaker 12DL, the circuit breaker 13DL, the circuit breaker 15DL and the circuit breaker 16DL is controlled.
Similarly, if the second power flow direction between the second substation 10kV bus and the line of the main power grid is the direction that the second substation 10kV bus points to the main power grid, and it is determined that the second substation 10kV bus does not have bus PT disconnection or bus frequency abnormality, each power supply (power supply 5, power supply 6, power supply 7 and power supply 8) in the substation is controlled to trip, that is, the circuit breaker 12DL, the circuit breaker 13DL, the circuit breaker 15DL and the circuit breaker 16DL are controlled to trip.
In addition, the control device can also detect whether the first substation 10kV bus and the second substation 10kV bus work normally, and if detecting that the first substation 10kV bus work abnormally and/or the second substation 10kV bus work abnormally, the control device can control the circuit breaker 12DL, the circuit breaker 13DL, the circuit breaker 15DL and the circuit breaker 16DL to trip.
The operation principle of the transformer substation when the circuit breaker 14DL is in the open state will be described below.
When the circuit breaker 14DL is in the closed state, the control device may acquire the three-phase voltage of the first substation 10kV bus, the three-phase voltage of the second substation 10kV bus, and the three-phase protection currents of the circuit breaker 12DL, the circuit breaker 13DL, the circuit breaker 15DL, and the circuit breaker 16DL, so as to determine the first power flow direction between the power supply 5 and the line of the first substation 10kV bus, the first power flow direction between the power supply 6 and the line of the first substation 10kV bus, the first power flow direction between the power supply 7 and the line of the second substation 10kV bus, and the first power flow direction between the power supply 8 and the line of the second substation 10kV bus, respectively.
In addition, the control device can also determine whether the bus PT wire breakage or the bus frequency abnormality occurs in the first substation 10kV bus and the second substation 10kV bus.
After determining the first power flow direction between each power supply and the target bus, if the first power flow direction between a certain power supply and the target bus is the direction that the power supply points to the target bus, and it is determined that the corresponding 10kV bus of the transformer substation does not have bus PT disconnection or bus frequency abnormality, the control device controls the first circuit breaker corresponding to the power supply to trip.
For example, if the first power flow direction between the power supply 5 and the line of the 10kV bus of the first substation is the direction in which the power supply 5 points to the 10kV bus of the first substation, and it is determined that the PT disconnection or the abnormal frequency of the bus of the 10kV bus of the first substation does not occur, the control device may control the circuit breaker 12DL to trip; for example, if the first power flow direction between the power supply 7 and the line of the 10kV bus of the second substation is the direction in which the power supply 7 points to the 10kV bus of the second substation, and it is determined that the PT disconnection or the abnormal frequency of the bus of the second substation does not occur in the 10kV bus of the second substation, the control device may control the circuit breaker 15DL to trip.
The control device may further obtain three-phase protection currents of the breaker 10DL and the breaker 11DL, and determine a second current direction between the first substation 10kV bus and the line of the main power grid according to the three-phase voltage of the first substation 10kV bus and the three-phase protection current of the breaker 10DL, and determine a second current direction between the second substation 10kV bus and the line of the main power grid according to the three-phase voltage of the second substation 10kV bus and the three-phase protection current of the breaker 11 DL.
(The above is the same as when the breaker 14DL is in the closed state)
Unlike what is when the circuit breaker 14DL is in the closed state, if the second direction of flow between the first substation 10kV bus and the line of the main power grid is the direction in which the first substation 10kV bus points to the main power grid, and it is determined that the bus PT disconnection or the bus frequency abnormality does not occur in the first substation 10kV bus, the disconnection of the respective power supplies (power supply 5 and power supply 6) connected to the first substation 10kV bus, that is, the trip of the circuit breaker 12DL and the circuit breaker 13DL is controlled, and the disconnection of the respective power supplies (power supply 7 and power supply 8) connected to the second substation 10kV bus is not controlled.
Similarly, if the second power flow direction between the second substation 10kV bus and the line of the main power grid is the direction in which the second substation 10kV bus points to the main power grid, and it is determined that the second substation 10kV bus does not have the bus PT broken line or the bus frequency abnormality, then the respective power supplies (power supply 7 and power supply 8) connected to the second substation 10kV bus are controlled to be disconnected, that is, the circuit breaker 15DL and the circuit breaker 16DL are controlled to trip, and the respective power supplies (power supply 5 and power supply 6) connected to the first substation 10kV bus are not controlled to be disconnected.
In addition, the control device can also detect whether the first substation 10kV bus and the second substation 10kV bus work normally, if the first substation 10kV bus is detected to work abnormally, the control device can control the circuit breaker 12DL and the circuit breaker 13DL to trip and not control the circuit breaker 15DL and the circuit breaker 16DL to trip, and if the second substation 10kV bus is detected to work abnormally, the control device can control the circuit breaker 15DL and the circuit breaker 16DL to trip and not control the circuit breaker 12DL and the circuit breaker 13DL to trip.
Based on the anti-reverse-flow protection method of the transformer substation provided by the embodiment of the application, the embodiment of the application further provides an anti-reverse-flow protection device of the transformer substation for realizing the embodiment of the method, refer to fig. 4, and fig. 4 is a schematic structural diagram of the anti-reverse-flow protection device of the transformer substation provided by the embodiment of the application. As shown in fig. 4, the anti-reverse-flow protection device 40 of the substation may include: the power flow direction determining unit 41 and the disambiguation control unit 42.
Wherein:
The power flow direction determining unit 41 is configured to determine, for each power supply connected to the target bus, a first power flow direction between the power supply and a line of the target bus; the target bus is a bus connected with a main power grid in the transformer substation.
The disconnection control unit 42 is configured to perform disconnection control on the power supply if the first power flow direction is a direction from the power supply to the target bus.
Optionally, the power flow direction determining unit 41 is specifically configured to:
Acquiring three-phase voltages of a target bus;
acquiring three-phase protection current of a first circuit breaker connected with a target bus in a circuit between a power supply and the target bus;
and determining a first tide direction according to the three-phase voltage and the three-phase protection current of the first circuit breaker.
Optionally, the splitting control unit 42 is specifically configured to:
in a line between a control power source and a target bus, a first circuit breaker connected to the target bus trips.
Optionally, the power flow direction determining unit 41 is further configured to determine a second power flow direction between the target bus and the line of the main power grid; the disconnection control unit 42 is further configured to perform disconnection control on all power sources connected to the target bus if the second power flow direction is a direction from the target bus to the main power grid.
Optionally, the power flow direction determining unit 41 is specifically configured to:
Acquiring three-phase voltages of a target bus;
Acquiring three-phase protection current of a second circuit breaker connected with a target bus in a line between the target bus and a main power grid;
and determining a second tide direction according to the three-phase voltage and the three-phase protection current of the second circuit breaker.
Optionally, the splitting control unit 42 is specifically configured to:
for each power source connected to the target bus, a first circuit breaker in the line between the power source and the target bus is controlled to trip.
Optionally, the splitting control unit 42 is specifically configured to: determining whether bus PT disconnection or bus frequency abnormality occurs in the target bus;
and if the bus PT is not broken and the bus frequency is abnormal, and the first tide direction is the direction from the power supply to the target bus, the disconnection control is carried out on the power supply.
It should be noted that, because the content of information interaction and execution process between the above units is based on the same concept as the method embodiment of the present application, specific functions and technical effects thereof may be referred to the method embodiment specifically, and will not be described herein again.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a control device according to an embodiment of the present application. As shown in fig. 5, the control apparatus 5 provided in the present embodiment may include: a processor 50, a memory 51 and a computer program 52 stored in the memory 51 and executable on the processor 50, for example a program corresponding to the anti-reflux protection method of a substation. The steps in the embodiment of the anti-reverse current protection method applied to the transformer substation described above, such as S101 to S102 shown in fig. 1, are implemented when the processor 50 executes the computer program 52. Or the processor 50, when executing the computer program 52, performs the functions of the modules/units of the embodiment of the anti-reflux protection device of the substation described above, such as the functions of the units 41-42 shown in fig. 3.
By way of example, the computer program 52 may be partitioned into one or more modules/units, which are stored in the memory 51 and executed by the processor 50 to complete the present application. One or more of the modules/units may be a series of computer program instruction segments capable of performing a specific function for describing the execution of the computer program 52 in the control device 5. For example, the computer program 52 may be divided into a tidal current direction determining unit and a disconnection controlling unit, and the specific functions of each unit are described with reference to the corresponding embodiment of fig. 3, which is not repeated here.
It will be appreciated by those skilled in the art that fig. 5 is merely an example of the control device 5 and does not constitute a limitation of the control device 5, and may include more or fewer components than shown, or may combine certain components, or may be different components.
The processor 50 may be a central processing unit (central processing unit, CPU), but may also be other general purpose processors, digital signal processors (DIGITAL SIGNAL processors, DSPs), application Specific Integrated Circuits (ASICs), off-the-shelf programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 51 may be an internal storage unit of the control device 5, such as a hard disk or a memory of the control device 5. The memory 51 may also be an external storage device of the control device 5, such as a plug-in hard disk, a smart memory card (SMART MEDIA CARD, SMC), a Secure Digital (SD) card, or a flash memory card (FLASH CARD) provided on the control device 5. Further, the memory 51 may also include both an internal storage unit of the control device 5 and an external storage device. The memory 51 is used to store computer programs and other programs and data required to control the apparatus. The memory 51 may also be used to temporarily store data that has been output or is to be output.
It will be clear to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units is illustrated, and in practical application, the above-mentioned functional distribution may be implemented by different functional units according to needs, that is, the internal structure of the anti-backflow protection device of the transformer substation is divided into different functional units, so as to implement all or part of the functions described above. The functional units in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, the specific names of the functional units are also only for distinguishing from each other, and are not used to limit the protection scope of the present application. The specific working process of the units in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
Embodiments of the present application also provide a computer readable storage medium having a computer program stored therein, which when executed by a processor, performs the steps of the respective method embodiments described above.
The embodiments of the present application provide a computer program product for causing a terminal device to carry out the steps of the respective method embodiments described above when the computer program product is run on the terminal device.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference may be made to related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (10)
1. A method for protecting a transformer substation against reverse flow, applied to a control device of the transformer substation, the method comprising:
Determining, for each power source connected to a target bus, a first direction of flow between the power source and a line of the target bus; the target bus is a bus connected with a main power grid in the transformer substation;
and if the first tide direction is the direction from the power supply to the target bus, performing disconnection control on the power supply.
2. The method of claim 1, wherein the determining a first direction of flow between the power source and the line of the target bus comprises:
Acquiring three-phase voltages of the target bus;
acquiring three-phase protection current of a first circuit breaker connected with the target bus in a circuit between the power supply and the target bus;
And determining the first power flow direction according to the three-phase voltage and the three-phase protection current of the first circuit breaker.
3. The method of claim 2, wherein the splitting control of the power supply comprises:
And controlling the first breaker connected with the target bus to trip in a line between the power supply and the target bus.
4. The method as recited in claim 1, further comprising:
Determining a second tide direction between the target bus and a line of the main power grid;
And if the second tide direction is the direction pointing to the main power grid from the target bus, performing disconnection control on all power supplies connected with the target bus.
5. The method of claim 4, wherein the determining a second direction of flow between the target bus and the line of the main grid comprises:
Acquiring three-phase voltages of the target bus;
acquiring three-phase protection current of a second circuit breaker connected with the target bus in a circuit between the target bus and the main power grid;
And determining the second power flow direction according to the three-phase voltage and the three-phase protection current of the second circuit breaker.
6. The method of claim 4, wherein the splitting control of all power sources connected to the target bus comprises:
for each power source connected to the target bus, controlling a first circuit breaker in a line between the power source and the target bus to trip.
7. The method according to any one of claims 1 to 6, wherein if the first power flow direction is a direction from the power source to the target bus, the splitting control is performed on the power source, including:
determining whether bus PT disconnection or bus frequency abnormality occurs in the target bus;
And if the bus PT disconnection and bus frequency abnormality do not occur in the target bus, and the first power flow direction is the direction from the power supply to the target bus, performing disconnection control on the power supply.
8. An anti-reflux protection device of a substation, applied to a control device of the substation, characterized in that the device comprises:
A power flow direction determining unit configured to determine, for each power supply connected to a target bus, a first power flow direction between the power supply and a line of the target bus; the target bus is a bus connected with a main power grid in the transformer substation;
and the disconnection control unit is used for performing disconnection control on the power supply if the first power flow direction is the direction from the power supply to the target bus.
9. A control device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor, when executing the computer program, realizes the steps in the anti-reflux protection method of a substation according to any one of claims 1-7.
10. A computer-readable storage medium storing a computer program, characterized in that the computer program, when executed by a processor, implements the steps of the anti-reverse-flow protection method of a substation according to any one of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410297169.1A CN118137433A (en) | 2024-03-15 | 2024-03-15 | Reverse-flow prevention protection method and device for transformer substation, control equipment and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410297169.1A CN118137433A (en) | 2024-03-15 | 2024-03-15 | Reverse-flow prevention protection method and device for transformer substation, control equipment and storage medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118137433A true CN118137433A (en) | 2024-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410297169.1A Pending CN118137433A (en) | 2024-03-15 | 2024-03-15 | Reverse-flow prevention protection method and device for transformer substation, control equipment and storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118137433A (en) |
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2024
- 2024-03-15 CN CN202410297169.1A patent/CN118137433A/en active Pending
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