CN111786383B - Spare power automatic switching device and method for realizing mutual backup of multiple power incoming lines - Google Patents
Spare power automatic switching device and method for realizing mutual backup of multiple power incoming lines Download PDFInfo
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- CN111786383B CN111786383B CN202010627235.9A CN202010627235A CN111786383B CN 111786383 B CN111786383 B CN 111786383B CN 202010627235 A CN202010627235 A CN 202010627235A CN 111786383 B CN111786383 B CN 111786383B
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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Abstract
The invention relates to a spare power automatic switching device and a method for realizing mutual backup of a plurality of power incoming lines, and belongs to the technical field of power grid equipment. The method includes determining whether a voltage of a primary power supply is voltage-lost; if yes, determining the priorities of a plurality of standby power supplies and setting parameters for representing whether the standby power supplies are added into the standby switch; taking the standby power supply with the setting parameter as a first parameter as a target standby power supply, wherein the first parameter is used for representing that the standby power supply allows automatic standby switching; and closing the circuit breaker of the target standby power supply source with the first priority in the target standby power supply sources. Therefore, mutual backup of a plurality of power supply incoming lines can be realized, so that the time for recovering the power supply of the voltage-loss bus is greatly shortened when any power supply incoming line loses power, and the popularization is effectively improved; and meanwhile, the backup switch can be switched on and off according to a self-set priority sequence, so that the electromagnetic loop closing of two power supplies of the transformer substation caused by the backup switch action can be effectively prevented.
Description
Technical Field
The invention belongs to the technical field of power grid equipment, and particularly relates to a spare power automatic switching device and a method for realizing mutual backup of a plurality of power incoming lines.
Background
For two incoming line circuit breakers and a main wiring mode of a bridge wiring in a power grid of a sectional circuit breaker, the existing spare power automatic switching has four spare power automatic switching modes, has certain self-adaption and meets certain power supply reliability requirements.
Referring to fig. 1, a method 1 in the related art: DL1, FD1 in-bit, DL2 in-bit. The power supply 1 supplies power to the transformer substation A (the incoming line 1 is mainly supplied, and the incoming line 2 is supplied).
If an abnormality occurs (such as a line fault of an incoming line 1 or a stealing trip of a DL1 breaker), because the power supply 1 can not supply power to the substation A, the spare power automatic switching device detects that the TV I and the TV II are out of voltage, namely, the spare power automatic switching device sends a trip DL1 instruction to ensure that the substation A is tripped DL1, and then the spare power automatic switching device switches on the DL2 instruction and switches on DL2 to enable the power supply 2 to supply power to the substation A, so that the power supply of the substation A is recovered.
Of course, the incoming line 1 may be prepared as the incoming line 2, and referring to fig. 2, the method 2 in the prior art is adopted. At this time, the standby switching mode can refer to the inlet wire 2 for standby inlet wire 1, and is not described herein again.
Referring to fig. 3, a method 3 in the related art: DL1, DL2 in-situ, FD1 in-situ. Power 1 supplies power to the A I bus of the transformer substation, and power 2 supplies power to the A II bus of the transformer substation (II bus is provided with I bus).
If an abnormal condition occurs (such as a fault of a line of an incoming line 1 or the stealing trip of a DL1 breaker), a power supply 1 cannot normally supply power to an I bus of a transformer substation, the I bus of the transformer substation loses voltage, and a spare power automatic switching device detects the I voltage loss of a TV of the transformer substation A. And the spare power automatic switching device acts, firstly sends a jump DL1 command to ensure that the DL1 is jumped off, then sends a section FD1 command to close a section FD1 breaker, and restores the A I parent power supply of the transformer substation.
Of course, the first mother and the second mother may be provided, and refer to fig. 3, and also refer to a mode 4 in the prior art, and at this time, the spare power switching mode may refer to the second mother and the first mother, and will not be described herein again.
In summary, the existing backup power automatic switching device is suitable for two specific incoming lines, the wiring mode of a segmented inner bridge main is poor in self-adaption, the wiring mode of a transformer substation is changed, the backup power automatic switching device cannot be installed and used, and the popularization and application value is low; in addition, the existing backup power automatic switching mode has complex logic and is easy to make mistakes, and the backup power automatic switching device is easy to malfunction or malfunction, thereby causing huge economic loss.
With the development of power grids and the improvement of power supply reliability requirements, power supply networks are not limited to the power supply form of an inner bridge, and the power supply form of multi-power supply and multi-connection lines is more and more common in power grid operation.
However, at present, the self-switching device is additionally equipped, which can only realize mutual backup of 3 circuit breakers including two power supply incoming line circuit breakers and one bus-tie circuit breaker, and is not suitable for other wiring modes, particularly for multiple power supplies.
Therefore, how to solve the above technical problems is a technical problem which needs to be solved urgently.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a spare power automatic switching device and a spare power automatic switching method for realizing mutual backup of a plurality of power incoming lines.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a backup power automatic switching method for realizing mutual backup of a plurality of power inlet wires comprises the following steps:
determining whether the voltage of the main power supply is voltage-loss;
if yes, determining the priorities of a plurality of standby power supplies and setting parameters for representing whether the standby power supplies are added into the standby switch;
taking the standby power supply with the setting parameter as a first parameter as a target standby power supply, wherein the first parameter is used for representing that the standby power supply allows automatic standby switching;
closing a circuit breaker of a target auxiliary power supply source with a first priority rank in the target auxiliary power supply sources;
if the circuit breaker of the target standby power supply source with the first priority ranking is not successfully switched on, switching on the circuit breaker of the target standby power supply source with the second priority ranking in the target standby power supply source;
and if the circuit breaker of the target standby power supply source with the second priority rank is not successfully switched on, switching on the circuit breaker of the target standby power supply source with the third priority rank in the target standby power supply source until the circuit breaker is switched on successfully or the circuit breaker is switched on to the last target standby power supply source in the priority rank.
Further, it is preferable that the determining whether the voltage of the main power supply is lost includes:
determining whether the voltage values of the voltage after the bus of the main power supply source is switched and the line extraction voltage are both in voltage loss;
if so, representing the voltage loss of the main power supply;
and if not, representing that the voltage of the main power supply source is not subjected to voltage loss.
Further, it is preferable that the method further comprises:
after the switch of any spare power switching element is determined to be switched on or have current, and the whole group does not return, if the time delay is less than or equal to the preset time delay and meets the first preset condition, starting an 'accelerated switching after the fault' switch, sending a tripping-on and switching-off signal of the spare power switching element, and reporting the failure of the spare power switching; when the switch of the spare power switching element is in the closed position, the switch of the spare power switching element indicates that a breaker of the spare power switching power supply connected with the spare power switching element is closed.
Further, it is preferable that the first preset condition satisfies:
the control word of the switch for switching to the accelerated switching after the fault is 1; and the number of the first and second electrodes,
any phase current of any spare power switching element is not less than a preset current; and the number of the first and second groups,
any phase voltage of any bus which is not subjected to the disconnection abnormity of the voltage transformer is lower than a preset voltage; or the like, or, alternatively,
any bus zero-sequence voltage which does not generate the line breaking abnormity of the voltage transformer is larger than a bus zero-sequence voltage threshold value under the fault; or the like, or, alternatively,
any bus negative sequence voltage which does not generate the abnormal disconnection of the voltage transformer is larger than the bus negative sequence voltage threshold value under the fault.
Further, it is preferable that the method further comprises:
a main power supply line is hung on the follow-tripping voltage-loss bus, and a small power supply of the follow-tripping voltage-loss bus is connected;
when the switch of the main power supply source of the following hop and the switch of the small power supply of the joint hop are in the separated position, closing the standby section switch;
otherwise, when the switch of the main power supply source of the following jump and the switch of the small power supply of the combined jump are not in the branch position, after the time delay of the switch position confirmation, the discharging operation is carried out, and the failure of the spare power automatic switching is reported;
when the 'accelerating switch after the fault is switched in' switch, the spare section switch is switched on, and then any main power supply action element of a normal operation bus is used for judging, if any phase current of the spare section switch is not less than the corresponding interval preset current in the preset delay, a tripping signal is sent to the section switch, and the failure of the spare automatic switch is reported;
otherwise, if the voltage of the voltage-loss bus is recovered within a second preset time, reporting that the backup automatic switching is successful;
otherwise, if the voltage of the voltage-loss bus is not recovered within a second preset time, reporting that the backup power automatic switching fails.
The invention also provides a spare power automatic switching device for realizing mutual backup of a plurality of power inlet wires, which comprises: the device comprises an analog quantity acquisition board, a switching quantity acquisition board, a discharge quantity output board and a logic board; the logic board is respectively connected with the analog quantity acquisition board, the switching value acquisition board and the output board;
the analog quantity acquisition board is used for collecting analog quantity of line extraction voltage of each incoming line of the transformer substation, voltage and line current after bus switching and converting the analog quantity into an electric quantity state signal;
the switching value acquisition board is used for taking charge of the states of incoming lines and sectional circuit breakers of the transformer substation, the on-off state of the functional pressing board and the acquisition of locking signals;
the logic board is used for receiving the electrical quantity state signal converted by the analog quantity acquisition board and the switching value signal acquired by the switching value acquisition board, analyzing the received electrical quantity and switching value signal, and judging according to the backup power automatic switching method for realizing mutual backup of a plurality of power supply incoming lines to form an electrical control command;
and the output board is used for receiving the electrical control command sent by the logic board, completing electrical control on each incoming line and the sectional circuit breaker of the transformer substation and realizing power supply switching.
Further, preferably, the analog quantity acquisition board acquires line extraction voltage of each incoming line of the transformer substation and voltage analog quantity after bus switching, and the logic board comprehensively judges and represents whether each power supply incoming line is a main power supply source or a standby power supply source according to the two voltage analog quantities.
The single bus (including single bus segment) power grid structure has the advantages that the operation mode of the incoming line running on a certain bus is fixed, and the voltage of each incoming line bus after switching is the same as the bus voltage. The double-bus power grid structure has the advantages that the incoming line can operate on the first section of bus and can also operate on the second section of bus, and the voltage truly reflects the operation (connection) condition of primary equipment of a power grid after the incoming line bus is switched.
Preferably, the logic board of the automatic bus transfer device of the invention is composed of a high-performance embedded processor, a memory, an Ethernet controller and other peripheral devices. The power supply inlet wire can be subjected to priority parameter setting, and the spare power automatic switching logic acts according to the priority.
The invention endows three attributes to the interval of each incoming line of the transformer substation. The attribute one is as follows: the attributes of the main power supply and the standby power supply are marked by judging the voltage and non-voltage condition of the extracted voltage of the line at the interval and the voltage and non-voltage condition of the switched bus. And II, attribute II: the priority attribute is marked by the power setting control word from this interval. Attribute three: and judging the attribute of the disconnecting link according to the position of the bus, and setting control words for marking according to the bus hung at the interval. These three attributes are given to each incoming line interval, and are targeted. The spare power automatic switching mode can be independently determined by each targeted incoming line interval, so that the spare power automatic switching device has autonomy and intelligence.
Wherein, the priority of inlet wire circuit breaker is set, and priority setting is carried out according to coming from the power. And the spare power automatic switching device carries out spare power switching according to the priority level.
Preferably, a 'bus position judgment disconnecting link' attribute of the incoming line breaker is set, and when the attribute is set to be 1, the bus hung at the interval of the incoming line breaker is represented as I bus; when the attribute is set to be 2, the bus hung at the interval of the incoming line breaker is represented as a II bus.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a spare power automatic switching method for realizing mutual backup of a plurality of power supply incoming lines, which is characterized in that whether the voltage of a main power supply is in voltage loss or not is determined; if yes, determining the priorities of a plurality of standby power supplies and setting parameters for representing whether the standby power supplies are added into the standby switch; taking the standby power supply with the setting parameter as a first parameter as a target standby power supply, wherein the first parameter is used for representing that the standby power supply allows automatic standby switching; closing a circuit breaker of a target auxiliary power supply source with a first priority rank in the target auxiliary power supply sources; if the circuit breaker of the target standby power supply source with the first priority ranking is not successfully switched on, switching on the circuit breaker of the target standby power supply source with the second priority ranking in the target standby power supply source; and if the circuit breaker of the target standby power supply source with the second priority rank is not successfully switched on, switching on the circuit breaker of the target standby power supply source with the third priority rank in the target standby power supply source until the circuit breaker is switched on successfully or the circuit breaker is switched on to the last target standby power supply source in the priority rank. Therefore, mutual backup of a plurality of power supply incoming lines can be realized, so that the time for recovering the power supply of the voltage-loss bus is greatly shortened when any power supply incoming line loses power, and the popularization is effectively improved; and meanwhile, the backup power supply can be switched on and off according to a self-set priority sequence, so that the electromagnetic loop closing of the two 110kV power supplies caused by the backup power supply can be effectively prevented. Further, compared with the prior art, for a 110kV substation in an unattended mode in the prior art, if any power inlet wire loses power, the operation of a voltage-loss bus can be recovered by manually switching the operation mode after an operator arrives at the site, which may take 2700 seconds. If the lost electricity charge is calculated according to the average electricity loss of 4 times in 1 year: 4 times × 40000kW × 0.75h × 0.45 yuan =54000 yuan; labor cost: 4 times × 2 people × 150 yuan =1200 yuan; and (3) traffic fee: about 1000 yuan; reduce 12398 complaint penalties: about 10000 yuan, if the power is lost by 6.62 ten thousand yuan per year according to the configuration of the prior art, the method disclosed by the invention can reduce the power loss time of the load of the whole station caused by the power loss of any power inlet wire of the 110kV transformer substation from 2700 seconds to 5 seconds, thereby shortening 99.8 percent, greatly improving the power supply reliability, improving the customer satisfaction, improving the enterprise image and effectively reducing the power supply loss.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a circuit connection diagram of a backup power automatic switching mode 1 in which two power inlet lines are mutually backup in the prior art;
fig. 2 is a schematic circuit connection diagram of a backup power automatic switching mode 2 in which two power inlet lines are mutually backup in the prior art;
fig. 3 is a schematic circuit connection diagram of backup power automatic switching modes 3 and 4 in which two power inlet lines are mutually backup in the prior art;
fig. 4 is a schematic diagram of a backplane plug-in of the backup power automatic switching device according to the present invention;
fig. 5 is a flowchart of a backup power automatic switching method for realizing mutual backup of a plurality of power inlet lines according to the present invention;
fig. 6 is a circuit connection diagram of the backup power automatic switching method for realizing mutual backup of a plurality of power inlet lines according to the present invention;
fig. 7 is a schematic diagram of another circuit connection for implementing the backup power automatic switching method for mutual backup of multiple power inlet lines according to the present invention;
fig. 8 is a schematic structural diagram of the backup power automatic switching device for realizing mutual backup of multiple power inlet lines according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples.
It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention. The examples do not specify particular techniques or conditions, and are performed according to the techniques or conditions described in the literature in the art or according to the product specifications. The materials or equipment used are not indicated by manufacturers, and all are conventional products available by purchase.
Therefore, the present application provides a backup power automatic switching method for realizing mutual backup of multiple power inlet lines, and specifically, refer to a flowchart of a backup power automatic switching method for realizing mutual backup of multiple power inlet lines shown in fig. 5, where the method is applied to a substation, such as a 110kV substation, and the method specifically includes the following steps:
step S201, determining whether the voltage of the main power supply source is voltage-loss.
The main power supply is a power supply which is mainly used for supplying power when the transformer substation normally operates. In contrast, there is a backup power supply, i.e., a backup power supply.
Generally, a 110kV substation has more than two 110kV incoming and outgoing lines, one of which is a main power supply incoming line and the other is an incoming line of a standby power supply.
Wherein, the voltage loss means that the voltage is lower than the normal voltage and can be zero.
As an embodiment, step S201 includes: determining whether the voltage values of the voltage after the bus of the main power supply source is switched and the line extraction voltage are both in voltage loss; if so, representing the voltage loss of the main power supply; and if not, representing that the voltage of the main power supply source is not subjected to voltage loss.
Step S202, if yes, determining priorities of a plurality of standby power supplies and setting parameters for representing whether the standby power supplies are added into the standby power supply.
Preferably, the plurality of backup power sources are assigned with priorities in advance.
Specifically, the priority of each backup power supply can be determined by obtaining a setting fixed value of the backup power supply.
Generally, the setting fixed value is written into the parameter of the standby power supply, and can be read in real time during operation.
Preferably, the tuning parameters include a first parameter and a second parameter.
Preferably, the first parameter is used for representing that the spare power supply is added, and the second parameter is used for representing that the spare power supply is not added. That is, when the setting parameter is the first parameter, it indicates that the backup power supply can be used as the target backup power supply. On the contrary, when the setting parameter is the second parameter, it indicates that the backup power supply source cannot be added into the backup power supply, that is, cannot be used as the target backup power supply source.
Preferably, the first parameter may be represented by 1, and the second parameter may be represented by 0.
Of course, in actual use, other numerical representations may be used, and are not particularly limited herein.
In a possible embodiment, the backup power supply further comprises an identifier for indicating whether the backup power supply is in a maintenance state. When the identifier is present, the backup power supply can be represented as a service power supply.
Wherein, the maintenance power supply satisfies the following conditions:
the overhaul pressing plate corresponding to the element is in a putting-in state.
② the pressing plate beside the interval is in the input state.
And thirdly, the power supply is not a main power supply and is not a standby power supply.
Fourthly, setting the spare power switching mode to be 0.
And fifthly, the voltage is not applied to line extraction.
It should be noted that the power supply status (such as the power supply, the backup power supply, and the maintenance power supply) refers to the status of the element switch, not the status of the element itself, such as a certain line interval maintenance status, i.e. the line switch maintenance (not participating in the automatic switching), but not the line maintenance (when the line is nearby, part of the electrical capacity is also participating in the automatic switching).
In the implementation process, the breaker maintenance pressing plate is arranged to mark the power state as the maintenance state, so that the problem that the maintenance of any breaker does not influence the spare power automatic switching operation can be solved, and the spare power automatic switching operation between the power supplies in the station can be better met in any operation mode of a 110kV transformer substation. That is to say, when the power supply is in the maintenance state, the spare power automatic switching of other power supplies can not be influenced at the moment.
Step S203, using the backup power supply source with the setting parameter as a first parameter as a target backup power supply source, wherein the first parameter is used for representing that the backup power supply source allows automatic backup switching.
The target standby power supply refers to a power supply which can be added with an automatic standby power supply.
For example, assume that there are 3 backup power sources, backup power source 1, backup power source 2, and backup power source 3, respectively. If the setting parameter of the power supply source 1 of the equipment is the second parameter and the setting parameter of the standby power supply source 2 and the standby power supply source 3 is the first parameter, the standby power supply source 1 cannot be used as a standby power supply, the standby power supply source 2 and the standby power supply source 3 allow automatic standby switching, and at the moment, the standby power supply source 2 and the standby power supply source 3 are target standby power supplies.
In the implementation process, the setting parameters of the standby power supply are determined, so that the power supply which cannot be subjected to standby switching can be filtered, and the standby switching efficiency is further improved.
In a possible embodiment, the standby power supplies can be sorted according to priority, whether the setting parameter of the standby power supply with the first priority is the first parameter or not is determined, and if so, the circuit breaker of the standby power supply is directly closed; if the setting parameter of the standby power supply source is the second parameter, determining whether the setting parameter of the standby power supply source with the second priority rank is the first parameter, and if so, directly closing the circuit breaker of the standby power supply source; and the rest can be done in the same way until the standby power supply is closed.
In the implementation process, the priority of the standby power supply is determined firstly, and the setting parameters of the standby power supply are judged when the switch is switched on, so that the data processing time can be reduced, and the time for recovering the power supply is further shortened.
And step S204, closing the circuit breaker of the target standby power supply source with the first priority in the target standby power supply sources.
Step S205, if the circuit breaker of the target secondary power supply source with the first priority rank is not successfully switched on, switching on the circuit breaker of the target secondary power supply source with the second priority rank in the target secondary power supply source.
Step S206, if the circuit breaker of the target secondary power supply source with the second priority ranking is not successfully switched on, the circuit breaker of the target secondary power supply source with the third priority ranking in the target secondary power supply source is switched on until the circuit breaker is switched on successfully or until the circuit breaker of the last target secondary power supply source in the priority ranking is switched on.
Continuing with the example of table 1, assume that incoming line 1 is the main power supply, and when the other two groups of power supplies are standby, the standby power supplies are switched according to the priority. If the incoming line 1 (3) trips to cause bus voltage loss, the priority 2 of the incoming line 2 is greater than the priority 3 of the incoming line 4, the incoming line 2 is closed first, and if the closing is unsuccessful, the incoming line 2 is opened and the incoming line 4 is closed continuously. If incoming lines 5 exist at the moment, and the priority of the incoming lines 5 is lower than that of the incoming lines 4, when the incoming lines 4 are switched on unsuccessfully, the incoming lines 5 can be switched on continuously until the incoming lines are switched on successfully or until the incoming lines are switched on to the last target standby power supply in the priority ranking, so that automatic standby switching is realized, the power supply of the transformer substation with multiple incoming lines can be recovered quickly after the main power supply is in voltage loss, the user use experience is improved, and the recovery cost is reduced.
For example, take an actual test data as an example: for a 110kV transformer substation in an unattended mode, if any power inlet wire loses power, the operation of a voltage-loss bus can be recovered by manually switching the operation mode after an operator arrives at the site, and the time of 2700 seconds is probably needed.
If the lost electricity charge is calculated according to the average electricity loss of 4 times in 1 year: 4 times × 40000kW × 0.75h × 0.45 yuan =54000 yuan; labor cost: 4 times × 2 people × 150 yuan =1200 yuan; and (3) traffic fee: about 1000 yuan; reduce 12398 complaint penalties: about 10000 yuan, if the power is lost by 6.62 ten thousand yuan per year according to the configuration of the prior art, the method disclosed by the invention can reduce the power loss time of the load of the whole station caused by the power loss of any power inlet wire of the 110kV transformer substation from 2700 seconds to 5 seconds, thereby shortening 99.8 percent, greatly improving the power supply reliability, improving the customer satisfaction, improving the enterprise image and effectively reducing the power supply loss.
It should be noted that the invention is applicable to 110kV substations with multiple power inlet wires, and can be applicable to both single-bus connection and double-bus connection, and further can be widely popularized and used.
In a possible embodiment, the spare power automatic switching method for realizing mutual backup of a plurality of power inlet lines further includes: after the switch of any spare power switching element is determined to be switched on or have current, and the whole group does not return, if the time delay is less than or equal to the preset time delay and meets the first preset condition, starting an 'accelerated switching after the fault' switch, sending a tripping-on and switching-off signal of the spare power switching element, and reporting the failure of the spare power switching; when the switch of the spare power switching element is in the closed position, the switch of the spare power switching element indicates that a breaker of the spare power switching power supply connected with the spare power switching element is closed.
That is to say, the invention also provides a function of 'automatic switching on and off after failure', and the normal spare power automatic switching action and mode adjustment can not be operated by mistake by the 'automatic switching on and off after failure', so that the probability of misoperation is reduced, and the accuracy of automatic switching is improved.
Because the bus in the existing transformer substation can not be configured with bus differential protection, when the bus breaks down, in order to avoid the spare power switching line from being switched to a fault point and causing accident enlargement, the function of 'switching to speed up after the fault' can be utilized at the moment so as to avoid misoperation.
Preferably, the first preset condition satisfies: the control word of the switch for switching to the accelerated switching after the fault is 1; any phase current of any spare power switching element is not less than preset current Ihjs (settable); any phase voltage of any bus which is not subjected to the disconnection abnormity of the voltage transformer is lower than a preset voltage (Uyy); or, any bus zero-sequence voltage which does not generate the line break abnormality of the voltage transformer is larger than the bus zero-sequence voltage threshold value under the fault; or the negative sequence voltage of any bus which is not subjected to the disconnection abnormity of the voltage transformer is larger than the negative sequence voltage threshold value of the bus under the fault.
Wherein, Uyy is used for the representation to judge that there is definite value (Un%), and its setting scope is: 0-99.9%, step length 0.1.
In the implementation process, after the switch of any spare power switching element is determined to be switched on or has current, and the whole group does not return, if the delay is less than or equal to the preset delay and meets a first preset condition, starting an 'accelerated switching after failure' switch, sending a tripping-on signal of the spare power switching element, and reporting the failure of the spare power switching; when the switch of the spare power switching element is in the closed position, the switch of the spare power switching element indicates that a breaker of the spare power switching power supply connected with the spare power switching element is closed. Therefore, the automatic switching is accelerated after the fault, the misoperation generated under the condition of normal spare power automatic switching action and mode adjustment can be effectively avoided, the probability of the misoperation is further reduced, and the accuracy of the automatic switching is improved.
In a possible embodiment, the spare power automatic switching method for realizing mutual backup of a plurality of power inlet lines further includes: a main power supply line is hung on the follow-tripping voltage-loss bus, and a small power supply of the follow-tripping voltage-loss bus is connected; when the switch of the main power supply source of the following hop and the switch of the small power supply of the joint hop are in the separated position, closing the standby section switch; otherwise, when the switch of the main power supply source of the following jump and the switch of the small power supply of the combined jump are not in the branch position, after the time delay of the switch position confirmation, the discharging operation is carried out, and the failure of the spare power automatic switching is reported; when the 'accelerating switch after the fault is switched in' switch, the spare section switch is switched on, and then any main power supply action element of a normal operation bus is used for judging, if any phase current of the spare section switch is not less than the corresponding interval preset current in the preset delay, a tripping signal is sent to the section switch, and the failure of the spare automatic switch is reported; otherwise, if the voltage of the voltage-loss bus is recovered within a second preset time, reporting that the backup automatic switching is successful; otherwise, if the voltage of the voltage-loss bus is not recovered within a second preset time, reporting that the backup power automatic switching fails.
In the implementation process, the invention can be self-adapted to double-bus wiring and single-bus wiring by executing the action logic of the segmented spare power automatic switching, if the bus connection mode is the single-bus wiring mode, the position of the bus coupler is opened into a short circuit (the bus coupler is always closed), and the function is quitted in a constant value list, so that the applicability is improved, and the popularization is improved.
As an application scenario, as shown in fig. 6, it is assumed that a substation a has 4 power supply incoming lines, and when 3 power supplies exist, the 3 power supplies are respectively a power supply 1, a power supply 2, and a power supply 3; the 4 power inlet wires are respectively an inlet wire 1, an inlet wire 2, an inlet wire 3 and an inlet wire 4. The voltage is extracted from a line 1 of the incoming line of the TV1, and the voltage is obtained after the switching of a bus 1 of the incoming line of the TV 1'; the voltage is extracted from a line 2 of the TV2 incoming line, and the voltage is obtained after the line 2 bus of the TV 2' incoming line is switched; voltage is extracted from a 3-line incoming line circuit of the TV3, and voltage is obtained after switching of a 3-bus incoming line of the TV 3'; the TV4 incoming line 4 line draws voltage, and the TV 4' incoming line 4 bus switches back voltage.
At this moment, under normal conditions, inlet wire 1, segmentation I close the position, and inlet wire 3, inlet wire 2 and inlet wire 4 divide into, and power 1 supplies power for transformer substation A. At the moment, a TV1 has a voltage, a TV1 'has a voltage, a power supply 1 is a main power supply, a TV3 has a voltage, a TV 3' has no voltage, and an incoming line 3 is a standby power supply; TV2 has pressure, TV2 'has no pressure, TV4 has pressure, TV 4' has no pressure, and incoming line 2 and incoming line 4 are standby power supplies.
The priority of each incoming line is set, for example, as shown in table 1:
TABLE 1
Wherein, 1) the incoming line 1 and the incoming line 3 come from the same group of power supply and can not be switched on by spare power supply;
2) the incoming lines 1 (3), 2 and 4 are from different power supplies respectively, wherein any two groups can be mutually incoming for standby operation;
3) when one group of power supplies is mainly supplied and the other two groups of power supplies are standby, the standby power supplies are switched according to the priority. If the incoming line 1 (3) trips to cause bus voltage loss, the priority 2 of the incoming line 2 is greater than the priority 3 of the incoming line 4, the incoming line 2 is closed first, and if the closing is unsuccessful, the incoming line 2 is opened and the incoming line 4 is closed continuously.
4) When any interval does not participate in the auto-casting or has no related interval temporarily, the interval can be set as 0 and does not participate in any logic judgment.
Therefore, the fixed value includes a description of the priority of the line while describing the power source of each line, and the fixed value can be selected from 0 to 4, and the priority is as follows: 1>2>3>4, 0 does not participate in spare power switching.
It should be noted that, when there are only two sets of power supplies, there is no priority, but the same constant value cannot be set at the same time to distinguish the sets.
It is to be understood that the above description is by way of example only, and not by way of limitation, as modifications may occur to those skilled in the art in light of the actual requirements.
If an abnormality occurs (such as a fault of an incoming line 1 or a stealing trip of a DL1 breaker), the main power supply source 1 cannot normally supply power to the transformer substation A, the backup automatic switching device detects that TVI and TVII are out of voltage, the backup automatic switching device firstly trips off the main power supply source and then closes the backup power supply source according to the priority sequence, so as to recover the power supply of the transformer substation A. Specifically, the spare power automatic switching device acts by firstly sending a tripping inlet wire 1 instruction to ensure that a breaker of the inlet wire 1 is tripped, the inlet wire 3 is a spare power supply source and has the highest priority, but the inlet wire 3 and the inlet wire 1 come from the same group of power supplies and have the same priority, so that the inlet wire 1 and the inlet wire 3 cannot be mutually standby, the spare power automatic switching device does not send a breaker instruction for closing the inlet wire 3, a closing instruction is sent to the breaker of the inlet wire 2 with the priority of 2, the breaker of the inlet wire 2 is closed after receiving the closing instruction, the power supply of the transformer substation A is recovered, and the spare power automatic switching is successful. And if the spare power automatic switching is unsuccessful, sending a closing instruction to the circuit breaker of the incoming line 4 so as to close the incoming line of the circuit breaker of the incoming line 4 until the spare power automatic switching is successful.
As another application scenario, as shown in fig. 7, it is assumed that the attribute value of the "bus position judgment switch" of the incoming line 1 and the incoming line 3 is 1, that is, the buses hung on the incoming line 1 and the incoming line 3 are I-buses, and if the attribute value of the "bus position judgment switch" of the incoming line 1 and the incoming line 3 is 2, that is, the buses hung on the incoming line 1 and the incoming line 3 are II-buses. Specifically, in a normal situation, the incoming line 1 breaker DL1 and the incoming line 2 breaker DL2 are in on position, and the section breaker FD1, the incoming line 3 breaker DL3 and the incoming line 4 breaker DL4 are in off position. The power supply 1 supplies power to a primary transformer I of the transformer substation A, the power supply 2 supplies power to a secondary transformer II of the transformer substation A, the TV1 has a voltage, the TV I1 'has a voltage, the incoming line 1 is a main power supply, the TV2 has a voltage, the TV II 2' has a voltage, and the incoming line 2 is also a main power supply. If an abnormal condition occurs (such as a line fault of an incoming line 1 or a DL1 steal jump), the power supply 1 cannot normally supply power to the I bus of the transformer substation A, the spare power automatic switching device detects the I voltage loss of the TV, the spare power automatic switching device firstly jumps off the I bus main power supply source, then closes the sectional FD1 breaker, the II bus main power supply source recovers the I bus power supply of the transformer substation A, and the spare power automatic switching is successful.
In summary, according to the backup power automatic switching method for realizing mutual backup of a plurality of power supply incoming lines, whether the voltage of the main power supply is in voltage loss or not is determined; if yes, determining the priorities of a plurality of standby power supplies and setting parameters for representing whether the standby power supplies are added into the standby switch; taking the standby power supply with the setting parameter as a first parameter as a target standby power supply, wherein the first parameter is used for representing that the standby power supply allows automatic standby switching; closing a circuit breaker of a target auxiliary power supply source with a first priority rank in the target auxiliary power supply sources; if the circuit breaker of the target standby power supply source with the first priority ranking is not successfully switched on, switching on the circuit breaker of the target standby power supply source with the second priority ranking in the target standby power supply source; and if the circuit breaker of the target standby power supply source with the second priority rank is not successfully switched on, switching on the circuit breaker of the target standby power supply source with the third priority rank in the target standby power supply source until the circuit breaker is switched on successfully or the circuit breaker is switched on to the last target standby power supply source in the priority rank. Therefore, mutual backup of a plurality of power supply incoming lines can be realized, so that the time for recovering the power supply of the voltage-loss bus is greatly shortened when any power supply incoming line loses power, and the popularization is effectively improved; and meanwhile, the backup switch can be switched on and off according to a self-set priority sequence, so that the electromagnetic loop closing of the two power supplies caused by the backup switch action can be effectively prevented.
As shown in fig. 8, a backup power automatic switching device for realizing mutual backup of multiple power inlet lines includes: an analog quantity acquisition board AI, a switching value acquisition board BI, a discharge output board BO and a logic board MON; the logic board MON is respectively connected with the analog quantity acquisition board AI, the switching value acquisition board BI and the output board BO;
the analog quantity acquisition board AI is used for collecting analog quantities of line extraction voltage, voltage and line current after bus switching of each incoming line of the transformer substation and converting the analog quantities into electric quantity state signals;
the switching value acquisition board BI is used for collecting the states of incoming lines and sectional circuit breakers of the transformer substation, the on-off state of the functional pressing board and blocking signals;
the logic board MON is used for receiving the electrical quantity state signal converted by the analog quantity acquisition board AI and the switching value signal acquired by the switching value acquisition board BI, analyzing the received electrical quantity and switching value signals, and judging according to the backup power automatic switching method for realizing mutual backup of a plurality of power inlet lines to form an electrical control command (namely a circuit breaker closing instruction);
and the output board BO is used for receiving the electrical control command sent by the logic board MON, completing electrical control on each incoming line and the sectional circuit breaker of the transformer substation and realizing power supply switching.
The analog quantity acquisition board AI acquires the line extraction voltage of each incoming line of the transformer substation and the voltage analog quantity after bus switching, and the logic board MON comprehensively judges and represents whether each power supply incoming line is a main power supply source or a standby power supply source according to the two voltage analog quantities.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A spare power automatic switching method for realizing mutual backup of a plurality of power inlet wires is characterized by comprising the following steps:
determining whether the voltage of the main power supply is voltage-loss;
if yes, determining the priorities of a plurality of standby power supplies and setting parameters for representing whether the standby power supplies are added into the standby switch;
taking the standby power supply with the setting parameter as a first parameter as a target standby power supply, wherein the first parameter is used for representing that the standby power supply allows automatic standby switching;
closing a circuit breaker of a target auxiliary power supply source with a first priority rank in the target auxiliary power supply sources;
if the circuit breaker of the target standby power supply source with the first priority ranking is not successfully switched on, switching on the circuit breaker of the target standby power supply source with the second priority ranking in the target standby power supply source;
if the circuit breaker of the target standby power supply source with the second priority ranking is not successfully switched on, switching on the circuit breaker of the target standby power supply source with the third priority ranking in the target standby power supply source until the circuit breaker is switched on successfully or the circuit breaker is switched on to the last target standby power supply source in the priority ranking;
the method further comprises the following steps:
after the switch of any spare power switching element is determined to be switched on or have current, and the whole group does not return, if the time delay is less than or equal to the preset time delay and meets the first preset condition, starting an 'accelerated switching after the fault' switch, sending a tripping-on and switching-off signal of the spare power switching element, and reporting the failure of the spare power switching; when the switch of the spare power switching element is in an on position, the switch of the spare power switching element indicates that a breaker of the spare power supply source connected with the spare power switching element is on;
the first preset condition satisfies:
the control word of the switch for switching to the accelerated switching after the fault is 1; and the number of the first and second electrodes,
any phase current of any spare power switching element is not less than a preset current; and the number of the first and second groups,
any phase voltage of any bus which is not subjected to the disconnection abnormity of the voltage transformer is lower than a preset voltage; or the like, or, alternatively,
any bus zero-sequence voltage which does not generate the line breaking abnormity of the voltage transformer is larger than a bus zero-sequence voltage threshold value under the fault; or the like, or, alternatively,
any bus negative sequence voltage which does not generate the abnormal disconnection of the voltage transformer is larger than the bus negative sequence voltage threshold value under the fault.
2. The method for realizing mutual backup of a plurality of power supply inlet lines as claimed in claim 1, wherein the determining whether the voltage of the main power supply is lost comprises:
determining whether the voltage values of the voltage after the bus of the main power supply source is switched and the line extraction voltage are both in voltage loss;
if so, representing the voltage loss of the main power supply;
and if not, representing that the voltage of the main power supply source is not subjected to voltage loss.
3. The method for realizing mutual backup of a plurality of power inlet lines as claimed in claim 1, wherein the method further comprises:
a main power supply line is hung on the follow-tripping voltage-loss bus, and a small power supply of the follow-tripping voltage-loss bus is connected;
when the switch of the main power supply source of the following hop and the switch of the small power supply of the joint hop are in the separated position, closing the standby section switch;
otherwise, when the switch of the main power supply source of the following jump and the switch of the small power supply of the combined jump are not in the branch position, after the time delay of the switch position confirmation, the discharging operation is carried out, and the failure of the spare power automatic switching is reported;
when the 'accelerating switch after the fault is switched in' switch, the spare section switch is switched on, and then any main power supply action element of a normal operation bus is used for judging, if any phase current of the spare section switch is not less than the corresponding interval preset current in the preset delay, a tripping signal is sent to the section switch, and the failure of the spare automatic switch is reported;
otherwise, if the voltage of the voltage-loss bus is recovered within a second preset time, reporting that the backup automatic switching is successful;
otherwise, if the voltage of the voltage-loss bus is not recovered within a second preset time, reporting that the backup power automatic switching fails.
4. A spare power automatic switching device for realizing mutual backup of a plurality of power inlet wires is characterized by comprising: the device comprises an analog quantity acquisition board, a switching quantity acquisition board, a discharge quantity output board and a logic board; the logic board is respectively connected with the analog quantity acquisition board, the switching value acquisition board and the output board;
the analog quantity acquisition board is used for collecting analog quantity of line extraction voltage of each incoming line of the transformer substation, voltage and line current after bus switching and converting the analog quantity into an electric quantity state signal;
the switching value acquisition board is used for taking charge of the states of incoming lines and sectional circuit breakers of the transformer substation, the on-off state of the functional pressing board and the acquisition of locking signals;
the logic board is used for receiving the electrical quantity state signal converted by the analog quantity acquisition board and the switching value signal acquired by the switching value acquisition board, analyzing the received electrical quantity and switching value signal, and judging according to the spare power automatic switching method for realizing mutual backup of a plurality of power incoming lines in any one of claims 1, 2 and 3 to form an electrical control command;
and the output board is used for receiving the electrical control command sent by the logic board, completing electrical control on each incoming line and the sectional circuit breaker of the transformer substation and realizing power supply switching.
5. The automatic standby power switching device for realizing mutual standby of a plurality of power inlet wires according to claim 4, characterized in that: the analog quantity acquisition board acquires line extraction voltage of each incoming line of the transformer substation and voltage analog quantity after bus switching, and the logic board comprehensively judges and represents whether each power incoming line is a main power supply source or a standby power supply source according to the two voltage analog quantities.
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| CN101917056A (en) * | 2010-08-16 | 2010-12-15 | 广东省电力调度中心 | 220kV bus switch spare automatic switching method of 550kV station |
| CN103595120A (en) * | 2013-11-21 | 2014-02-19 | 长园深瑞继保自动化有限公司 | Multi-incoming-line standby power supply automatic switching-in method |
| CN104009449A (en) * | 2014-05-13 | 2014-08-27 | 龙滩水电开发有限公司 | 3 kV-10 kV bus protection and failure protection method |
| CN104167808A (en) * | 2014-08-15 | 2014-11-26 | 广州供电局有限公司 | Automatic 220kV spare power switching method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101917056A (en) * | 2010-08-16 | 2010-12-15 | 广东省电力调度中心 | 220kV bus switch spare automatic switching method of 550kV station |
| CN103595120A (en) * | 2013-11-21 | 2014-02-19 | 长园深瑞继保自动化有限公司 | Multi-incoming-line standby power supply automatic switching-in method |
| CN104009449A (en) * | 2014-05-13 | 2014-08-27 | 龙滩水电开发有限公司 | 3 kV-10 kV bus protection and failure protection method |
| CN104167808A (en) * | 2014-08-15 | 2014-11-26 | 广州供电局有限公司 | Automatic 220kV spare power switching method |
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