CN112653183B - Centralized switching control system and method for multiple transformer blocking devices of power plant or power grid - Google Patents
Centralized switching control system and method for multiple transformer blocking devices of power plant or power grid Download PDFInfo
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- CN112653183B CN112653183B CN202011420013.6A CN202011420013A CN112653183B CN 112653183 B CN112653183 B CN 112653183B CN 202011420013 A CN202011420013 A CN 202011420013A CN 112653183 B CN112653183 B CN 112653183B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
Abstract
The invention discloses a centralized switching control method and a centralized switching control system for a plurality of transformer blocking devices of a power plant or a power grid, wherein the method comprises the following steps: s1, receiving operation parameter signals transmitted by N units in real time; s2, judging whether any direct current signal exceeds a current threshold, and if so, outputting a same-throw instruction; if not, executing S3; s3, judging whether the current sum of all direct current signals exceeds a total threshold value, and if so, outputting part of switching instructions; if not, executing S4; s4, judging whether each direct current signal in the N operation parameter signals is lower than a simultaneous-return safety threshold, and if so, outputting a simultaneous-return instruction; if not, outputting part of the throwing and retreating instruction. In the centralized switching control system and method for the plurality of transformer blocking devices of the power plant or the power grid, the monitoring host judges according to the running parameter signals of the units and outputs the same switching instruction, part of switching instructions and the same switching instruction under different conditions, so that the remote centralized control mechanism function of the plurality of units is realized.
Description
Technical Field
The invention relates to the field of main transformers of power transmission systems, in particular to a centralized switching control system and method for a plurality of transformer blocking devices of a power plant or a power grid.
Background
In recent years, high-voltage direct-current transmission systems are developed in southwest electric power transmission and north electric power transmission in China. When the DC transmission single-stage earth loop of the convertor station runs, the existence of DC magnetic bias current can not only cause serious magnetic saturation of the transformer core, so that the loss of metal components of the transformer is increased, the local overheating phenomenon is caused, the insulation is destroyed, and the service life of the transformer is reduced; and excitation current distortion, harmonic wave generation, increased reactive power consumption of a transformer, reduced system voltage and the like can be caused, the safe and stable operation of the system is affected, and corresponding measures are needed to be taken for inhibition. The DC magnetic bias problem of the transformer is effectively solved by adopting the mode of connecting capacitors in series with the neutral point of the main transformer, the treatment effect is obvious and economical, and hundreds of DC magnetic bias devices are accumulated in the running DC blocking device at present in China.
However, with the large-scale operation of the neutral point direct current suppression device of the transformer, a corresponding new problem is also generated. Under the condition that a plurality of main transformers are provided with the blocking devices and operate in parallel, under the single-pole earth return line operation mode of a convertor station, as the direct current injected into the earth is gradually increased along with the grounding electrode, when the stray direct current flowing through the neutral point of a transformer reaches a set value and starts the blocking devices to operate in a blocking mode, the existing blocking devices are in a capacitor grounding state due to the action dyssynchrony of the blocking devices, and are in a direct grounding state, meanwhile, the operating parameters of each transformer are different, the parameters of current measuring elements of the blocking devices are different, and the like. The occurrence of the situation tends to cause the direct current of the main transformer neutral point which is not in a blocking state to be increased sharply, and the safe operation of the transformer is greatly influenced.
Disclosure of Invention
Aiming at the defects, the invention provides an improved centralized switching control system and method for a plurality of transformer blocking devices of a power plant or a power grid, which realize remote centralized control and operation of the plurality of blocking devices by adding external technical means and control logic and realize a linkage mechanism of synchronously switching into a blocking state and synchronously switching out of the blocking state.
The technical scheme adopted for solving the technical problems is as follows: the utility model provides a centralized switching control method of a plurality of transformer blocking devices of a power plant or a power grid, which comprises the following steps:
s1, receiving operation parameter signals transmitted by all N units in real time, wherein the operation parameter signals comprise direct current signals;
s2, judging whether any one of the N operation parameter signals exceeds a current threshold value, and if so, outputting a simultaneous casting instruction; if not, executing the step S3;
s3, judging whether the current sum of all the direct current signals in the N operation parameter signals exceeds a total threshold value, and if so, outputting part of the switching instructions; if not, executing the step S4;
s4, judging whether each direct current signal in the N operation parameter signals is lower than a simultaneous-return safety threshold value, and if so, outputting a simultaneous-return instruction; if not, outputting the partial throwing and reversing instruction.
Preferably, the method further includes step S0. of determining whether the status position conditions included in the N operation parameter signals are automatic, if yes, the corresponding synchronous linkage control mechanism of the unit is valid; if not, the synchronous linkage control mechanism of the corresponding unit is invalid in a remote or local state.
Preferably, the method further comprises step S5, after outputting the same-throw instruction or the same-return instruction, judging whether each unit is thrown successfully or withdrawn successfully, and if yes, returning to step S1; if not, outputting an input abnormality alarm signal or an exit abnormality alarm signal.
Preferably, the method further comprises the step S6 of judging whether the corresponding unit is successfully put into or withdrawn from after the partial put-in and withdraw instruction is output, and if yes, returning to the step S1; if not, outputting an input abnormality alarm signal or an exit abnormality alarm signal.
Preferably, the method further comprises the step S7 of judging whether each unit is normal in communication in real time according to the operation parameter signals, and if so, returning to the step S1; if not, outputting a communication abnormity alarm signal.
The centralized switching control system comprises a monitoring host, a unit and a switch for transmitting signals between the monitoring host and the unit, wherein the unit comprises a transformer, a blocking device for controlling the transformer and a controller for controlling the blocking device; the monitoring host comprises
The transmission module is used for receiving the operation parameter signals transmitted by all N units in real time, wherein the operation parameter signals comprise direct current signals;
the co-projection judging module is used for judging whether any one of the N running parameter signals exceeds a current threshold value or not, and selectively outputting a co-projection judging result, wherein the co-projection judging result comprises a co-projection instruction;
the partial switching judging module is used for selectively judging whether the current sum of all the direct current signals in the N operation parameter signals exceeds a total threshold value according to the same switching judging result and selectively outputting a partial switching judging result, wherein the partial switching judging result comprises a partial switching instruction;
and the simultaneous-withdrawal judging module is used for selectively judging whether each direct current signal in the N operation parameter signals is lower than a simultaneous-withdrawal safety threshold value according to the partial switching-withdrawal judging result, and selectively outputting a simultaneous-withdrawal judging result, wherein the simultaneous-withdrawal judging result comprises a simultaneous-withdrawal instruction.
Preferably, the monitoring host further includes a linkage judging module, configured to judge whether status position conditions included in the N operation parameter signals are automatic, and if yes, the corresponding synchronous linkage control mechanism of the unit is valid; if not, the synchronous linkage control mechanism of the corresponding unit is invalid in a remote or local state.
Preferably, the monitoring host also comprises a same-throw and same-throw alarm module for outputting the same-throw instruction or the same-throw instruction, judging whether each unit is successful in inputting or is successful in exiting, and selectively outputting an input abnormality alarm signal or an exit abnormality alarm signal.
Preferably, the monitoring host further comprises a partial switching alarm module, which is used for judging whether the corresponding unit is switched on successfully or is switched off successfully after the partial switching instruction is output, and selectively outputting a switching-on abnormal alarm signal or a switching-off abnormal alarm signal.
Preferably, the monitoring host further comprises a communication alarm module, which is used for judging whether each unit is normally communicated in real time according to the operation parameter signals, and selectively outputting communication abnormal alarm signals.
The implementation of the invention has the beneficial effects that: in the centralized switching control system and method for the plurality of transformers in the power plant or the power grid, the monitoring host judges according to the running parameter signals of the units and outputs the same switching instruction, part of the switching instruction and the same switching instruction under different conditions, so that the remote centralized control mechanism function of the plurality of units is realized, and the influence of overlarge and even damage of a certain transformer or a plurality of transformers due to direct-current magnetic bias is avoided, and the safe and stable running of the system is further influenced.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of a centralized switching control system for a plurality of transformer dc blocking devices of a power plant or power grid according to some embodiments of the present invention;
FIG. 2 is a schematic diagram of the monitoring host of FIG. 1;
fig. 3 is a flow chart of a centralized switching control method of a plurality of transformer blocking devices of a power plant or a power grid according to some embodiments of the present invention.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings.
Fig. 1 illustrates a centralized switching control system for a plurality of transformer dc blocking devices of a power plant or power grid in some embodiments of the present invention, for remotely and centrally controlling a plurality of units 30. The centralized switching control system of the multiple transformer blocking devices of the power plant or the power grid in the embodiment of the invention comprises a monitoring host 10, a switch 20 and N units 30, wherein the monitoring host 10 is communicated with the N units 30 through the switch 20, and the switching condition of the N units 30 is controlled in a centralized manner.
Wherein the switch 20 is used for transmitting signals between the monitoring host 10 and the group 30, preferably the switch 20 uses fiber optic connections.
The number of the units 30 is N, and the units can be set according to specific requirements. Each set 30 comprises a transformer 33, a dc blocking device 32 for controlling the transformer 33 and a controller 31 for controlling the dc blocking device 32.
Among them, the controller 31 is preferably an MCU. The controller 31 is provided with a synchronous linkage control mechanism, under which the controller 31 only starts to act as a request signal, i.e., an operation parameter signal, but does not act as an outlet of the device. The logic judgment of the direct-blocking input or the direct-blocking exit under other operation modes is kept unchanged.
When the transformer 33 is in maintenance or standby in a certain unit 30, the transformer is not involved in the synchronous linkage control mechanism, namely in an independent mode, through the software or hardware control logic of the monitoring host 10. The input or the exit of the unit 30 in maintenance or standby is not linked to the blocking devices 32 of other units 30; the input or the output of the blocking device 32 of the other units 30 is not linked to the blocking device 32 of the own unit 30.
As shown in fig. 1 and 2, the monitoring host 10 is configured to centrally control the switching of each unit 30. The monitoring host 10 is responsible for managing and coordinating the synchronous switching function. The monitoring host 10 and the controllers 31 of each unit 30 communicate data through the network mode of the switch 20.
The monitoring host 10 comprises a transmission module 11, a same-throw judging module 12, a part of throw-back judging module 13, a same-throw-back judging module 14, a linkage judging module 15, a same-throw same-back alarming module 16, a part of throw-back alarming module 17 and a communication alarming module 18.
The transmission module 11 is configured to receive, in real time, operation parameter signals transmitted by all N units 30, where the operation parameter signals include a dc signal. In the automatic control mode, assuming that each in-situ blocking device 32 is in a direct grounding state, when any one or more in-situ blocking devices 32 determine that a blocking input condition is provided, the controller 31 sends a request, that is, an operation parameter signal, to the transmission module 11 of the monitoring host 10, and the monitoring host 10 sends a blocking input command or a blocking exit command, and the controller 31 of each blocking device 32 executes the blocking input operation command.
The co-projection judging module 12 is configured to judge whether any one of the N operation parameter signals exceeds a current threshold, and selectively output a co-projection judging result, where the co-projection judging result includes a co-projection instruction. The partial switching judgment module 13 is configured to selectively judge whether the current sum of all the dc current signals exceeds a total threshold value in the N operation parameter signals according to the same switching judgment result, and selectively output a partial switching judgment result, where the partial switching judgment result includes a partial switching instruction.
The simultaneous-reverse judging module 14 is configured to selectively judge whether each of the N operation parameter signals is lower than a simultaneous-reverse safety threshold according to a partial switching judging result, and selectively output a simultaneous-reverse judging result, where the simultaneous-reverse judging result includes a simultaneous-reverse instruction.
When each blocking device 32 is under the capacitive blocking synchronous linkage control mechanism and the controller 31 logic of the blocking device 32 judges that the blocking device has the blocking out condition, the operation parameter signal sent to the monitoring host 10 comprises a blocking out state request, and the monitoring host 10 sends out a blocking out executing command to all blocking devices 32 only when receiving the blocking out requests of all blocking devices 32, and all blocking devices 32 are blocked out to the direct grounding state.
In some embodiments, the monitoring host 10 further includes a linkage determination module 15. The linkage judging module 15 is configured to judge whether the status position conditions included in the N operation parameter signals are automatic status, and if yes, the synchronous linkage control mechanism of the corresponding unit 30 is valid; if not, the corresponding synchronous linkage control mechanism of the unit 30 is invalid in the remote or local state.
Specifically, in the synchronous linkage control mechanism mode, the linkage judgment module 15 needs to judge the device state position signals of the respective controllers 31: remote/automatic/local. And, the synchronous linkage control mechanism is effective only when the blocking device 32 is under automatic control. The synchronous linkage control mechanism can be executed only when the monitoring host 10 and the controller 31 are in normal communication, and the communication abnormality gives an alarm, and the blocking device 32 exits the synchronous linkage control mechanism.
In the automatic control mode, assuming that each of the in-situ blocking devices 32 is in a direct grounded state, when any one or more of the in-situ blocking devices 32 determines that a blocking input condition is provided, a request is issued to the monitoring host 10, a blocking input command is issued from the monitoring host 10, and the controller 31 of each of the blocking devices 32 executes the blocking input operation command.
Under the direct grounding synchronous linkage control mechanism, when a linkage input command issued by the monitoring host 10 is received, each blocking device 32 unconditionally enters a blocking capacitor grounding input state.
In some embodiments, special conditions are also included: when the blocking device 32 is in the same-throw state, for example, when a fault of a certain blocking device 32 is forced to exit, the equipment body protection state change-over switch can be directly grounded to bypass the blocking, at this time, in order to avoid that the transformer exiting the blocking bears larger direct current, the same-throw device can rapidly calculate the total direct current of a plurality of on-throw transformers, and an instruction of same-throw is made under the condition that the total direct current exceeds a threshold value. And this instruction must be executed earlier than the failed device protection action time.
In the case where the protection logic of the in-place device body is unchanged, the monitoring host 10 performs the protection operation prior to the device body. If the total DC current calculation does not exceed the threshold value, the local transfer switch acts to bypass the fault capacitance device, and the monitoring host 10 continuously and closely monitors the total DC current until the fault capacitance device is eliminated and is put back into operation.
In some embodiments, the monitoring host 10 further includes a co-cast back alarm module 16. The co-casting and co-casting alarm module 16 is configured to output a co-casting instruction or a co-casting instruction, it is determined whether each of the units 30 is put into success or withdrawn from success, and selectively outputs the input abnormality warning signal or the exit abnormality warning signal.
If the monitoring host 10 detects that one or more of the blocking devices 32 fails to be blocked, the monitoring host 10 needs to send out a blocking instruction, the blocking devices 32 which have been blocked need to be immediately withdrawn from blocking, and meanwhile, the blocking function of the blocking devices 32 is blocked, and an alarm signal is sent out to wait for manual intervention. Similarly, when the blocking devices 32 are in the capacitance blocking state and the blocking devices 32 are in linkage exit execution, if the monitoring host 10 monitors that one or more blocking devices 32 fail to exit, the blocking devices are still in the blocking state, the linkage exit equipment is put into operation again, and an alarm signal is sent to wait for manual intervention.
In some embodiments, the monitoring host 10 further includes a partial pitch back alarm module 17. The partial switching alarm module 17 is configured to determine whether the corresponding unit 30 is switched on successfully or switched off successfully after outputting the partial switching instruction, and selectively output a switching on abnormal alarm signal or a switching off abnormal alarm signal.
In some embodiments, the monitoring host 10 further includes a communication alarm module 18. The communication alarm module 18 is configured to determine whether each unit 30 communicates normally in real time according to the operation parameter signal, and selectively output a communication abnormality alarm signal.
The reliability of the communication between the monitoring host 10 and the blocking device 32 is monitored in real time through the heartbeat and the real-time data transmission and response, so as to ensure that the stable operation of each blocking device 32, the switch 20 and the monitoring host 10 participating in linkage is in a known state. And outputting a fault alarm when the communication is abnormal.
In some embodiments, the centralized switching control system of the multiple transformer blocking devices of the power plant or the power grid can be modified based on the existing control scheme. Preferably, the following modifications are made:
the added monitoring host 10 is in data communication with the controller 31 of each of the blocking devices 32. The functions of the independent background machines of each running blocking device 32 can be replaced by the monitoring host 10, the running background host can be removed, and the centralized management and control of the equipment can be realized.
The controller 31 of the current running blocking device 32 is replaced, and functions related to a linkage mechanism and a network communication interface are implanted.
Fiber optic communications of each of the blocking devices 32 to the monitoring host 10 are added, and network fiber optic communications equipment is added at both ends.
Each of the blocking devices 32 adds a GPS/beidou clock synchronization function.
The new blocking device 32 is added to the background host computer screen cabinet.
The new controller 31 is adopted to replace the original old controller and the wave recording unit, and the existing in-station background master station is upgraded.
Compared with the prior art, the technical scheme in the embodiment of the invention has the advantages that:
(1) Remote unified control and operation of a plurality of main transformer DC blocking devices of a base can be realized, the on-site single operation mode is reduced, and the problem of simultaneous operation of the switching of the plurality of DC blocking devices 32 of a plurality of power stations is solved;
(2) Under the condition that the plurality of direct-current blocking devices 32 independently operate in actual operation, synchronous input and synchronous exit operation of the plurality of direct-current blocking devices 32 can be realized through remote operation, and the phenomenon that in an automatic mode, the asynchronism of the actions of the direct-current blocking devices 32 is avoided, so that one part of the direct-current blocking devices 32 are in a capacitor grounding state, and the other part of the direct-current blocking devices 32 are in a direct grounding state, so that direct current of a main transformer neutral point which does not enter the direct-current blocking state is rapidly increased, and a great risk is brought to safe operation of the main transformer 33;
(3) The control method and the logic structure are clear, the control mode is simple, the operation is easy, the installation is convenient, the maintenance is convenient, and the cost is low;
(4) The utility model has the advantages of the practicality is strong, and the protection effect after adding the blocking to the neutral points of a plurality of transformers 33 is obvious, not only is applicable to the nuclear power station, but also is applicable to the control and the operation of the neutral point blocking device 32 of each power station transformer 33 of the electric wire netting, can realize the unified switching control and the operation through a main monitoring station, and can furthest save the operation and maintenance investment when promoting the reliability of the transformers 33.
The following describes the control principle of the centralized switching control system of the power plant or the power grid multiple transformer blocking device in the previous embodiments with reference to fig. 1-3 and specific steps of the centralized switching control method of the power plant or the power grid multiple transformer blocking device in some embodiments of the present invention. In the embodiment of the invention, the centralized switching control method for the plurality of transformer blocking devices of the power plant or the power grid comprises the steps S0-S7.
S0. judges whether the status position conditions included in the N operation parameter signals are automatic, if yes, the corresponding synchronous linkage control mechanism of the unit 30 is valid; if not, the corresponding synchronous linkage control mechanism of the unit 30 is invalid in the remote or local state.
S1, operation parameter signals transmitted by all N units 30 are received in real time, wherein the operation parameter signals comprise direct current signals.
S2, judging whether any one of the N operation parameter signals exceeds a current threshold value, and if so, outputting a same-throw instruction; if not, step S3 is performed.
S3, judging whether the current sum of all the direct current signals in the N operation parameter signals exceeds a total threshold value, and if so, outputting part of switching instructions; if not, step S4 is performed.
S4, judging whether each direct current signal in the N operation parameter signals is lower than a simultaneous-return safety threshold, and if so, outputting a simultaneous-return instruction; if not, outputting part of the throwing and retreating instruction.
S5, after the same-throw instruction or the same-return instruction is output, judging whether each unit 30 is thrown successfully or withdrawn successfully, and if yes, returning to the step S1; if not, outputting an input abnormality alarm signal or an exit abnormality alarm signal.
S6, after the partial throwing and retreating instruction is output, judging whether the corresponding unit 30 is thrown successfully or retreated successfully, if so, returning to the step S1; if not, outputting an input abnormality alarm signal or an exit abnormality alarm signal.
S7, judging whether each unit 30 is normal in communication in real time according to the operation parameter signals, and if so, returning to the step S1; if not, outputting a communication abnormity alarm signal.
The centralized switching control method of the power plant or the power grid multiple-transformer direct-current blocking device in the embodiment is identical to that of the centralized switching control system of the power plant or the power grid multiple-transformer direct-current blocking device in the previous embodiment, and is not repeated here.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.
Claims (8)
1. A centralized switching control method for a plurality of transformer direct-current blocking devices of a power plant or a power grid is characterized by comprising the following steps:
s1, receiving operation parameter signals transmitted by all N units (30) in real time, wherein the operation parameter signals comprise direct current signals;
s2, judging whether any one of the N operation parameter signals exceeds a current threshold value, and if yes, outputting a same-throw instruction to the unit (30); if not, executing the step S3;
s3, judging whether the current sum of all the direct current signals in the N operation parameter signals exceeds a total threshold value, and if so, outputting a part of switching instructions to the unit (30); if not, executing the step S4;
s4, judging whether each direct current signal in the N operation parameter signals is lower than a simultaneous-return safety threshold, and if so, outputting a simultaneous-return instruction to the unit (30); if not, outputting the partial throwing and reversing instruction to the unit (30);
step S0. is further included to determine whether the status position conditions included in the N operation parameter signals are automatic status, if yes, the corresponding synchronous linkage control mechanism of the unit (30) is valid; if not, the synchronous linkage control mechanism of the corresponding unit (30) is invalid in a remote or local state;
if the synchronous linkage control mechanism of the unit (30) is effective, judging whether N operation parameter signals all comprise requests for exiting from a blocking state, and if so, outputting an exiting from a blocking execution command to the unit (30) to exit to a direct grounding state.
2. The centralized switching control method of a plurality of transformers in a power plant or a power grid according to claim 1, further comprising step S5, after outputting the same switching instruction or the same switching instruction, judging whether each unit (30) is switched on successfully or switched off successfully, if yes, returning to step S1; if not, outputting an input abnormality alarm signal or an exit abnormality alarm signal.
3. The centralized switching control method of a plurality of transformers in a power plant or a power grid according to claim 1, further comprising step S6, after outputting the partial switching instruction, determining whether the corresponding unit (30) is successfully switched in or out, and if so, returning to step S1; if not, outputting an input abnormality alarm signal or an exit abnormality alarm signal.
4. The centralized switching control method of a plurality of transformers in a power plant or a power grid according to claim 1, further comprising the steps of S7, judging whether each unit (30) is normally communicated in real time according to the operation parameter signals, and if so, returning to the step S1; if not, outputting a communication abnormity alarm signal.
5. The centralized switching control system for the multiple transformer blocking devices of the power plant or the power grid is characterized by comprising a monitoring host (10), a unit (30) and a switch (20) for transmitting signals between the monitoring host (10) and the unit (30), wherein the unit (30) comprises a transformer (33), a blocking device (32) for controlling the transformer (33) and a controller (31) for controlling the blocking device (32); the monitoring host (10) comprises
The transmission module (11) is used for receiving the operation parameter signals transmitted by all N units (30) in real time, wherein the operation parameter signals comprise direct current signals;
the co-projection judging module (12) is used for judging whether any one of the N operation parameter signals exceeds a current threshold value or not, and selectively outputting a co-projection judging result, wherein the co-projection judging result comprises a co-projection instruction;
the partial switching judging module (13) is used for selectively judging whether the current sum of all the direct current signals in the N operation parameter signals exceeds a total threshold value according to the same switching judging result and selectively outputting a partial switching judging result, wherein the partial switching judging result comprises a partial switching instruction;
the simultaneous-withdrawal judging module (14) is used for selectively judging whether each direct current signal in the N operation parameter signals is lower than a simultaneous-withdrawal safety threshold value according to the partial switching judging result, and selectively outputting a simultaneous-withdrawal judging result, wherein the simultaneous-withdrawal judging result comprises a simultaneous-withdrawal instruction;
the linkage judging module (15) is used for judging whether the state position conditions included in the N operation parameter signals are automatic states or not, and if yes, the corresponding synchronous linkage control mechanism of the unit (30) is effective; if not, the synchronous linkage control mechanism of the corresponding unit (30) is invalid in a remote or local state;
if the synchronous linkage control mechanism of the unit (30) is effective, judging whether N operation parameter signals all comprise requests for exiting from a blocking state, and if so, outputting an exiting from a blocking execution command to the unit (30) to exit to a direct grounding state.
6. The centralized switching control system for a plurality of transformers in a power plant or a power grid according to claim 5, wherein the monitoring host (10) further comprises a same-switching-on/off alarm module (16) for judging whether each unit (30) is switched on successfully or switched off successfully after outputting the same-switching-on/off instruction, and selectively outputting a switching-on abnormality alarm signal or a switching-off abnormality alarm signal.
7. The centralized switching control system of a plurality of transformer direct-current blocking devices of a power plant or a power grid according to claim 5 or 6, wherein the monitoring host (10) further comprises a part switching alarm module (17) for judging whether the corresponding unit (30) is successfully switched in or out after outputting the part switching instruction, and selectively outputting an abnormal switching alarm signal or an abnormal switching alarm signal.
8. The centralized switching control system of a plurality of transformer direct current blocking devices of a power plant or a power grid as claimed in claim 5 or 6, wherein the monitoring host (10) further comprises a communication alarm module (18) for judging whether each unit (30) is normally communicated in real time according to the operation parameter signals, and selectively outputting communication abnormality alarm signals.
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