CN111834988B - Method for switching small power supply in area spare power automatic switching connection mode - Google Patents
Method for switching small power supply in area spare power automatic switching connection mode Download PDFInfo
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- CN111834988B CN111834988B CN202010576294.8A CN202010576294A CN111834988B CN 111834988 B CN111834988 B CN 111834988B CN 202010576294 A CN202010576294 A CN 202010576294A CN 111834988 B CN111834988 B CN 111834988B
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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
- H02H7/261—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 involving signal transmission between at least two stations
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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Abstract
The invention discloses a method for switching small power supplies by regional spare power automatic switching-in and switching-out, which comprises the steps of sequencing switches and substations of non-power stations in a chain type power supply network by setting the number of series-supply substations to be N; setting a two-dimensional table, wherein when the serial number of an open-loop point switch is a row number and the serial number of a trip switch is a column number, the elements in the table are trip matrixes of the regional spare power automatic switching small jump power supply; when the chain type power supply network normally operates, the regional backup power automatic switch determines the position of an open loop point according to panoramic information, obtains the serial number of a switch of the open loop point, and obtains the serial number of a tripping switch after an original main power supply switch close to a power failure station of a fault point is tripped when a fault occurs; and according to the obtained open-loop point switch serial number and the trip switch serial number, obtaining a trip matrix of the jointly-switched small power supply and converting the trip matrix into a binary system, and if the bit is 1, tripping off the small power supply of the transformer substation corresponding to the bit. The invention can realize that when any switch is used as an open loop point and any line or bus has a fault in a chain type power supply structure, a small power supply between the fault point and the open loop point is quickly cut off.
Description
Technical Field
The invention relates to a method for switching small power supplies by regional spare power automatic switching, and belongs to the technical field of relay protection and safety automatic control of a power system.
Background
In recent years, the construction of power grids in China is greatly developed, and the method is basically suitable for economic growth and the requirements of electricity utilization in people's life. However, in many areas, particularly in the midwest, the rack is still very weak, and a plurality of chain type power supply structures exist. In the chain type power supply structure with the power supplies at two sides, an open loop point is arranged during operation in order to prevent an electromagnetic ring network and limit short-circuit current. Due to the logic limitation of the conventional backup power automatic switching, a series power supply transformer substation without an open loop point is actually changed into single power supply, and the power supply reliability is greatly reduced.
The regional spare power automatic switch can be used for realizing automatic power restoration of a chain type power supply structure. Each substation in the chain type power supply network is provided with a control sub machine device to mainly finish data acquisition work and an abnormality judgment function; the control host device can be installed at any station and receives data uploaded by each control sub-device to form panoramic information of the chain type power supply network. And judging the operation mode of the system according to the panoramic information, and completing fault positioning, fault isolation and power restoration when the system fails.
Before the regional spare power automatic switching is carried out on the open-loop point switch, a bus between a fault point and the open-loop point needs to meet a non-voltage condition. When a small power supply exists in the system, the non-voltage condition can not be met or can be met after the small power supply is broken down for a period of time and the like. Therefore, how to solve the technical problems that the corresponding small power supply needs to be cut off at the same time of tripping the original main power supply switch of the power-off station close to the fault point, and how to quickly select and cut off the small power supply between the fault point and the open-loop point is urgent to solve in the field.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for switching a small power supply by regional spare power automatic switching, which can quickly cut off the small power supply between a fault point and an open loop point by a table look-up mode after a chain type power supply network fails, meet the voltage loss condition required by the switch closing of the open loop point switch and recover power supply.
The invention adopts the following technical scheme: a method for switching small power supply by regional spare power automatic switching is characterized by comprising the following steps:
step SS 1: setting the number of the series transformer substations to be N, and sequencing switches and non-power station transformer substations in the chain type power supply network;
step SS 2: setting a two-dimensional table, wherein the row number value corresponds to the serial number of the open-loop point switch, the column number value corresponds to the serial number of the trip switch, and the elements in the table are trip matrixes of the regional spare power automatic switching corresponding to the small tripping power supply when the serial number of the open-loop point switch is the row number and the serial number of the trip switch is the column number;
step SS 3: when the chain type power supply network normally operates, the regional backup power automatic switch determines the position of an open loop point according to panoramic information, obtains the serial number of a switch of the open loop point, and obtains the serial number of a tripping switch after an original main power supply switch close to a power failure station of a fault point is tripped when a fault occurs;
step SS 4: and acquiring a tripping matrix of the jointly-switched small power supply according to the open-loop point switch serial number and the tripping switch serial number obtained in the step SS3, converting the tripping matrix into a binary system, and tripping off the small power supply of the transformer substation corresponding to the position when the position is 1.
As a preferred embodiment, step SS1 specifically includes: when the switches and the non-power station substations in the chain type power supply network are sequenced, the power stations are sequenced in the direction from one power station to the other power station, and the sequence numbers are sequentially increased from 0.
As a preferred embodiment, step SS1 further includes: the switch serial number of the first power supply station is set to be 0, and the switch serial number of the other power supply station is 2N-3; the serial number of the serial supply station close to the first power supply station is 0, and the serial number of the serial supply station close to the second power supply station is N-3.
As a preferred embodiment, step SS2 specifically includes: and the tripping matrix of the regional backup power automatic switching small tripping power supply is represented by 8421 codes, and each bit corresponds to the serial number of the non-power station transformer substation after the binary system is converted.
As a preferred embodiment, step SS3 specifically includes: the regional spare power automatic switching sub-machines collect the bus voltage of each series station, the current of a series line and the position state of a switch.
As a preferred embodiment, the method for determining the open-loop point switch includes: when the regional automatic backup power switching host detects that all the buses of the series transformer substation have voltage and only one switch is separated without current, the regional automatic backup power switching host starts charging, and the switch is determined as an open-loop point switch.
As a preferred embodiment, the method further comprises: and if the communication between the regional automatic backup power switching host and any regional automatic backup power switching sub-machine is interrupted, locking the regional automatic backup power switching function and not identifying the open-loop point switch.
As a preferred embodiment, step SS3 further includes: and the regional spare power automatic switching host receives a protection action signal of the relay protection device, and the protection action signal is an action signal of line longitudinal differential protection or bus differential protection, so that the fault is judged to be in the protection range of the relay protection device.
As a preferred embodiment, step SS3 specifically includes: when the chain type power supply network fails, the original main power supply switch close to the power failure station at the fault point has no abnormal position alarm, the submachine of the substation where the switch is located normally receives the information of the regional spare power automatic switching host, and the serial number of the tripping switch is recorded.
As a preferred embodiment, the method further comprises: the regional spare power automatic switching host sends a tripping command to a submachine needing to cut off a small power supply through an optical fiber channel, and the submachine receives the tripping command to drive a relay outlet to trip a small power supply switch; when the small power switch is refused to operate, the bus between the fault point and the open loop point is not subjected to voltage loss, and the spare power automatic switching discharges in the area after 50 s.
The invention achieves the following beneficial effects: firstly, aiming at solving the technical requirements of how to quickly select and cut off the small power supply between a fault point and an open loop point when an original main power supply switch of a power-off station close to the fault point is tripped, sequencing switches and substations of non-power stations in a chain power supply network by setting the number of series-supply substations to be N; setting a two-dimensional table, wherein the row number value corresponds to the serial number of the open-loop point switch, the column number value corresponds to the serial number of the trip switch, and the elements in the table are trip matrixes of the regional spare power automatic switching small tripping power supply when the serial number of the open-loop point switch is the row number and the serial number of the trip switch is the column number; when the chain type power supply network normally operates, the regional backup power automatic switch determines the position of an open loop point according to panoramic information, obtains the serial number of a switch of the open loop point, and obtains the serial number of a tripping switch after an original main power supply switch close to a power failure station of a fault point is tripped when a fault occurs; according to the open-loop point switch serial number and the trip switch serial number obtained in the step S3, obtaining a trip matrix of the connected small power supply and converting the trip matrix into a binary system, and if one bit is 1, tripping off the small power supply of the transformer substation corresponding to the bit; secondly, the invention can realize that any switch is taken as an open-loop point, any line or bus generates faults in a chain type power supply network structure, quickly cuts off a small power supply between the fault point and the open-loop point, meets the voltage loss condition required by the switch closing of the open-loop point, ensures the correct action of the regional spare power automatic switch, and maintains the stable operation of the power network.
Drawings
FIG. 1 is a flow chart of a method of a preferred embodiment of the present invention.
Fig. 2 is a schematic connection diagram of a chain-link power supply network of a preferred embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1: referring to fig. 1 and fig. 2, the present invention provides a method for switching a small power supply in a regional spare power automatic switching system, and specifically 4 steps of the method are as follows.
Step SS 1: setting the number of the series transformer substations to be 6, the serial numbers of the C station and the F station to be 0-3 in sequence, the serial number of the switch of the A station to be 0, the serial number of the switch of the B station to be 9, and the serial numbers of the switches of the middle station to be 1-8 in sequence.
Step SS 1: setting a two-dimensional table X10, wherein the row number is an open-loop point switch serial number, the column number is a tripping switch serial number, the table elements are tripping matrixes for the regional backup power automatic switching device to jump small power supplies when the open-loop point serial number is the row number and the tripping switch serial number is the column number, each bit corresponds to the serial number of a non-power station transformer substation, and the data is as follows:
{{0,0,0x1,0x1,0x3,0x3,0x7,0x7,0xf,0xf},
{0,0,0x1,0x1,0x3,0x3,0x7,0x7,0xf,0xf},
{0x1,0x1,0,0,0x2,0x2,0x6,0x6,0xe,0xe},
{0x1,0x1,0,0,0x2,0x2,0x6,0x6,0xe,0xe},
{0x3,0x3,0x2,0x2,0,0,0x4,0x4,0xc,0xc},
{0x3,0x3,0x2,0x2,0,0,0x4,0x4,0xc,0xc},
{0x7,0x7,0x6,0x6,0x4,0x4,0,0,0x8,0x8},
{0x7,0x7,0x6,0x6,0x4,0x4,0,0,0x8,0x8},
{0xf,0xf,0xe,0xe,0xc,0xc,0x8,0x8,0,0},
{0xf,0xf,0xe,0xe,0xc,0xc,0x8,0x8,0,0},
}。
step SS 3: when the system normally operates, buses of the A-F station have pressure, a switch with the serial number of 4 is divided into positions and has no flow, and the serial number of the switch at the open loop point is determined to be 4. When K9 breaks down, the regional spare power automatic switching device can trip the original main power supply switch of the F station, the serial number is 8, and the serial number of the trip switch is determined to be 8.
Step SS 4: and reading the element X [4] [8] ═ 0xC, converting into a binary system of 1100, and indicating that the substation small power supplies with the serial numbers of 2 and 3 need to be cut off, namely cutting off the small power supplies of the E station and the F station.
According to the analysis of practical conditions, when a fault occurs at the K9 position, the power supply of the E station and the F station is lost, the buses of the E station and the F station are required to be ensured to be completely pressureless before the regional spare power automatic switch is switched on the open-loop point switch, so that the small power supplies of the E station and the F station are required to be cut off, and the verification is consistent with the result verification obtained by the method.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method for switching small power supply by regional spare power automatic switching is characterized by comprising the following steps:
step SS 1: setting the number of the series transformer substations to be N, and sequencing switches and non-power station transformer substations in the chain type power supply network;
step SS 2: setting a two-dimensional table, wherein the row number value corresponds to the serial number of the open-loop point switch, the column number value corresponds to the serial number of the trip switch, and the elements in the table are trip matrixes of the regional spare power automatic switching corresponding to the small tripping power supply when the serial number of the open-loop point switch is the row number and the serial number of the trip switch is the column number;
step SS 3: when the chain type power supply network normally operates, the regional backup power automatic switch determines the position of an open loop point according to panoramic information, obtains the serial number of a switch of the open loop point, and obtains the serial number of a tripping switch after an original main power supply switch close to a power failure station of a fault point is tripped when a fault occurs;
step SS 4: and acquiring a tripping matrix of the jointly-switched small power supply according to the open-loop point switch serial number and the tripping switch serial number obtained in the step SS3, converting the tripping matrix into a binary system, and tripping off the small power supply of the transformer substation corresponding to the position when the position is 1.
2. The method for area automatic power switching and switching of small power supply according to claim 1, wherein step SS1 specifically comprises: when the switches and the non-power station substations in the chain type power supply network are sequenced, the power stations are sequenced in the direction from one power station to the other power station, and the sequence numbers are sequentially increased from 0.
3. The method for area automatic power switching and switching on a small power supply as claimed in claim 2, wherein the step SS1 further comprises: the switch serial number of the first power supply station is set to be 0, and the switch serial number of the other power supply station is 2N-3; the serial number of the serial supply station close to the first power supply station is 0, and the serial number of the serial supply station close to the second power supply station is N-3.
4. The method for area automatic power switching and switching of small power supply according to claim 1, wherein step SS2 specifically comprises: and the tripping matrix of the regional backup power automatic switching small tripping power supply is represented by 8421 codes, and each bit corresponds to the serial number of the non-power station transformer substation after the binary system is converted.
5. The method for switching off the small power supply of the regional automatic power switching system according to claim 1, wherein the step SS3 specifically comprises: the regional spare power automatic switching sub-machines collect the bus voltage of each series station, the current of a series line and the position state of a switch.
6. The method for area automatic backup power switching and small power switching according to claim 5, wherein the method for determining the open loop point switch comprises the following steps: when the regional automatic backup power switching host detects that all the buses of the series transformer substation have voltage and only one switch is separated without current, the regional automatic backup power switching host starts charging, and the switch is determined as an open-loop point switch.
7. The method for switching off the small power supply of the regional automatic power switching device in a connected mode according to claim 6, wherein the method further comprises the following steps of: and if the communication between the regional automatic backup power switching host and any regional automatic backup power switching sub-machine is interrupted, locking the regional automatic backup power switching function and not identifying the open-loop point switch.
8. The method for switching off the small power supply of the regional automatic power switching system as claimed in claim 1, wherein the step SS3 further comprises: and the regional spare power automatic switching host receives a protection action signal of the relay protection device, and the protection action signal is an action signal of line longitudinal differential protection or bus differential protection, so that the fault is judged to be in the protection range of the relay protection device.
9. The method for area automatic power switching and switching on a small power supply as claimed in claim 8, wherein the step SS3 specifically comprises: when the chain type power supply network fails, the original main power supply switch close to the power failure station at the fault point has no abnormal position alarm, the submachine of the substation where the switch is located normally receives the information of the regional spare power automatic switching host, and the serial number of the tripping switch is recorded.
10. The method for area automatic power switching and switching of small power supply according to claim 1, further comprising: the regional spare power automatic switching host sends a tripping command to a submachine needing to cut off a small power supply through an optical fiber channel, and the submachine receives the tripping command to drive a relay outlet to trip a small power supply switch; when the small power switch is refused to operate, the bus between the fault point and the open loop point is not subjected to voltage loss, and the spare power automatic switching discharges in the area after 50 s.
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