CN112666413A - Detection device and method for alternating current series connection into direct current system - Google Patents
Detection device and method for alternating current series connection into direct current system Download PDFInfo
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Abstract
The invention discloses a device and a method for detecting an Alternating Current (AC) series-connected DC system. The detection device for the alternating current series-connection direct current system comprises: a switch unit, a switch control circuit, an input terminal, and an output terminal; the switch unit is connected between the input terminal and the output terminal, and the output terminal comprises an output positive terminal and an output negative terminal; the switch control circuit is electrically connected with the output positive terminal and the output negative terminal respectively and used for controlling the switch unit to be switched on and off according to the output positive terminal to ground alternating voltage and/or the output negative terminal to ground alternating voltage. The alternating current series-connection direct current system detection device provided by the invention realizes the monitoring of the exceeding of the alternating current quantity of the direct current system of the transformer substation, avoids the phenomenon that secondary equipment mistakenly sends remote signaling and circuit faults caused by the fact that the alternating current component is in series connection with the direct current system, reduces the potential safety hazard of the direct current system, and improves the reliability of the direct current system.
Description
Technical Field
The embodiment of the invention relates to a secondary power supply technology, in particular to a device and a method for detecting an Alternating Current (AC) series-connected DC system.
Background
The direct current system of the transformer substation provides power for secondary equipment in the transformer substation, stable operation of each relay protection device, each automation device and each safety automation device is guaranteed, and stability of the direct current system of the transformer substation is particularly important.
In actual power grid operation experience, it is found that if the amount of alternating current is connected in series in a direct current system, an automatic system can mistakenly send remote signaling to affect the study and judgment of a dispatching monitoring on a power grid, and if the amount of alternating current is serious, a line in operation can be tripped, so that line power failure and load loss are caused, and even the stable operation of the power grid is affected in severe cases. The insulation monitoring device of the direct current system used by the existing transformer substation does not have the function of monitoring the exceeding of the alternating current and has great hidden danger.
Disclosure of Invention
The invention provides a method and a device for detecting an alternating current series-connected direct current system, which achieve the effects of reducing the potential safety hazard of the direct current system and improving the reliability of the direct current system.
In a first aspect, an embodiment of the present invention provides a detection apparatus for an ac series-connected dc system, where the detection apparatus for an ac series-connected dc system includes: a switch unit, a switch control circuit, an input terminal, and an output terminal; the switch unit is connected between the input terminal and the output terminal, and the output terminal comprises an output positive terminal and an output negative terminal; the switch control circuit is electrically connected with the output positive terminal and the output negative terminal respectively and used for controlling the switch unit to be switched on and off according to the output positive terminal to ground alternating voltage and/or the output negative terminal to ground alternating voltage.
Optionally, the switch control circuit comprises: the system comprises an acquisition module and a main control module; the acquisition module comprises an alternating current acquisition unit, and the alternating current acquisition unit is used for acquiring the alternating current voltage of the output positive terminal to the ground and the alternating current voltage of the output negative terminal to the ground; the main control module is connected with the alternating current acquisition unit and used for controlling the switch-on and switch-off of the switch unit according to the relation between the absolute value of the alternating current voltage of the output positive terminal to the ground and a first set voltage threshold value and/or the relation between the absolute value of the alternating current voltage of the output negative terminal to the ground and a second set voltage threshold value acquired by the alternating current acquisition unit.
Optionally, the switch control circuit further includes a driving circuit, and the driving circuit is connected between the main control module and the switch unit, and is configured to process a control signal from the main control module to the switch unit, and output the control signal to the switch unit.
Optionally, the input terminal comprises: an input positive terminal, an input negative terminal, and a ground terminal; the acquisition module further comprises: the direct current acquisition unit, the direct current acquisition unit respectively with input positive terminal, input negative terminal and ground terminal electricity are connected, are used for gathering the input positive terminal with direct current voltage between the input negative terminal the input positive terminal to ground direct current voltage with the input negative terminal is to ground direct current voltage, and send to main control module.
Optionally, the switch unit includes a first control switch connected between the input positive terminal and the output positive terminal, and a second control switch connected between the input negative terminal and the output negative terminal.
Optionally, the detection apparatus for the ac series-connection dc system further includes: the indicating module, indicating module is including inserting indicating unit, operation indicating unit and trouble indicating unit, insert indicating unit the operation indicating unit with trouble indicating unit all with the host system electricity is connected, it is used for receiving to insert indicating unit sends first pilot signal when host system's the successful signal of access, operation indicating unit is used for receiving send second pilot signal when host system's normal operating signal, trouble indicating unit is used for receiving send third pilot signal when host system's fault signal, first pilot signal the second pilot signal with third pilot signal is respectively different.
Optionally, the switch control circuit further comprises: and the storage module is connected with the main control module and used for storing fault recording data when receiving the fault signal of the main control module.
Optionally, the detection apparatus for the ac series-connection dc system further includes: the communication circuit is connected with the main control module and the upper computer and is used for uploading the fault recording data to the upper computer.
In a second aspect, an embodiment of the present invention further provides a method for detecting an ac series-connected dc system, where the method is executed by the apparatus for detecting an ac series-connected dc system, and the method includes: the switch control circuit controls the conduction state of the switch unit according to the output positive terminal-to-ground alternating current voltage and/or the output negative terminal-to-ground alternating current voltage.
Optionally, the switch control circuit controls the conduction state of the switch unit according to the output positive terminal-to-ground alternating voltage and/or the output negative terminal-to-ground alternating voltage, and includes: the alternating current acquisition unit acquires the alternating current voltage of the output positive terminal to the ground and the alternating current voltage of the output negative terminal to the ground; the main control module controls the switch unit to be switched on and off according to the relation between the absolute value of the output positive terminal to ground alternating voltage and a first set voltage threshold value and/or the relation between the absolute value of the output negative terminal to ground alternating voltage and a second set voltage threshold value, wherein the relation is acquired by the alternating current acquisition unit.
The detection device of the alternating current series-connected direct current system provided by the invention is connected between a direct current bus and secondary equipment, a switch control circuit determines the alternating current component in an electric signal flowing into the secondary equipment by acquiring the alternating current voltage of an output positive terminal to the ground and/or the alternating current voltage of an output negative terminal to the ground, and whether the alternating current component which is connected in series in the direct current system exceeds the set threshold value is judged by judging whether the alternating current component is larger than the set threshold value or not, if the alternating current component which is connected in series in the direct current system exceeds the set threshold value, the switch control circuit can control the switch unit to be switched off, and the connection between the secondary equipment and the direct current bus is cut off, so that the alternating current quantity of the direct current system of the transformer substation exceeds the set threshold value, the phenomenon that the secondary equipment mistakenly sends remote signaling and circuit faults caused by the fact that the alternating current component is connected in series in the direct current system is avoided, the potential safety hazard of the direct current system is.
Drawings
Fig. 1 is a schematic diagram of a detection apparatus for an ac series dc system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of another detection apparatus for ac series dc system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of another detection apparatus for ac series dc system according to an embodiment of the present invention;
fig. 4 is a schematic diagram of another detection apparatus for detecting ac series-connection into a dc system according to an embodiment of the present invention;
fig. 5 is a schematic diagram of another detection apparatus for detecting ac series-connection into a dc system according to an embodiment of the present invention;
fig. 6 is a schematic diagram of another detection apparatus for detecting ac series-connection into a dc system according to an embodiment of the present invention;
fig. 7 is a schematic diagram of another detection apparatus for ac series dc system according to an embodiment of the present invention;
fig. 8 is a schematic diagram of another detection apparatus for ac series dc system according to an embodiment of the present invention;
fig. 9 is a flowchart of a detection method for an ac series dc system according to an embodiment of the present invention;
fig. 10 is a flowchart of another detection method for detecting ac series-connected dc systems according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The embodiment of the invention provides a detection device for an Alternating Current (AC) series-connected Direct Current (DC) system. Fig. 1 is a schematic diagram of a detection apparatus for an ac-to-dc serial system according to an embodiment of the present invention, and referring to fig. 1, the detection apparatus 100 for an ac-to-dc serial system includes: a switching unit 110, a switching control circuit 120, an input terminal 130, and an output terminal 140; the switching unit 110 is connected between the input terminal 130 and the output terminal 140, and the output terminal 140 includes an output positive terminal 141 and an output negative terminal 142; the switch control circuit 120 is electrically connected to the positive output terminal 141 and the negative output terminal 142, respectively, and is configured to control the switch unit 110 to be turned on and off according to the ac voltage to ground from the positive output terminal 141 and/or the ac voltage to ground from the negative output terminal 142.
Optionally, the input terminal 130 of the detection apparatus 100 for ac series-connection into the dc system is connected to a dc bus of a substation, and the output terminal 140 is connected to a secondary device in the substation, where the switch unit 110 is used to implement connection and disconnection between the secondary device and the dc system including the dc bus of the substation, and when the switch unit 110 is turned on, the dc bus of the substation is connected to the secondary device, so as to provide a dc power supply for the secondary device. Illustratively, the switching unit 110 may employ a MOS transistor with a model number IRFP360PBF to provide a high-current switching function; the switch control circuit 120 may collect the ac voltage of the output positive terminal 141 and the ac voltage of the output negative terminal 142, and control the switch unit 110 to be turned on or off according to the collected information, so as to connect or disconnect the dc bus of the substation with or from the secondary device.
For example, in the working process of the secondary equipment of the substation, the switch unit 110 is turned on, the switch control circuit 120 collects the ground alternating-current voltage of the output positive terminal 141 and the ground alternating-current voltage of the output negative terminal 142, performs data processing on the collected data, such as data packing, data cleaning, invalid data removing, and the like, and determines whether the absolute value of the ground alternating-current voltage of the output positive terminal 141 and/or the absolute value of the ground alternating-current voltage of the output negative terminal 142 is greater than a set threshold; if yes, the switch control circuit 120 determines that the alternating current signal in the direct current system of the transformer substation exceeds the standard, controls the switch unit 110 to be switched off, and cuts off the connection between the secondary equipment and the direct current system of the transformer substation to prevent the secondary equipment fault caused by the alternating current signal; if not, the switch control circuit 120 determines that the value of the ac signal in the dc system of the transformer substation is within the safe range, and controls the switch unit 110 to remain on.
The detection device of the ac series-connection dc system provided in this embodiment is connected between the dc bus and the secondary device, the switch control circuit determines the ac component in the electrical signal flowing into the secondary device by collecting the ac voltage from the output positive terminal to the ground and/or the ac voltage from the output negative terminal to the ground, and whether the alternating current component which is connected in series in the direct current system exceeds the set threshold value is judged by judging whether the alternating current component is larger than the set threshold value or not, if the alternating current component which is connected in series in the direct current system exceeds the set threshold value, the switch control circuit can control the switch unit to be switched off, and the connection between the secondary equipment and the direct current bus is cut off, so that the alternating current quantity of the direct current system of the transformer substation exceeds the set threshold value, the phenomenon that the secondary equipment mistakenly sends remote signaling and circuit faults caused by the fact that the alternating current component is connected in series in the direct current system is avoided, the potential safety hazard of the direct current system is.
Fig. 2 is a schematic diagram of another detection apparatus for detecting ac series-connected dc systems according to an embodiment of the present invention, referring to fig. 2, optionally, the switch control circuit 120 includes: the acquisition module 222 comprises an alternating current acquisition unit 223, and the alternating current acquisition unit 223 is used for acquiring the alternating current voltage of the output positive terminal 141 to the ground and the alternating current voltage of the output negative terminal 142 to the ground; the main control module 221 is connected to the ac collecting unit 223, and is configured to control the switch unit 110 to be turned on and off according to the relationship between the absolute value of the ac voltage to ground of the output positive terminal 141 and the first set voltage threshold and/or the relationship between the absolute value of the ac voltage to ground of the output negative terminal 142 and the second set voltage threshold collected by the ac collecting unit 223.
The alternating current acquisition unit 223 is electrically connected with the output positive terminal 141 and the output negative terminal 142 respectively, and is used for acquiring an alternating current voltage of the output positive terminal 141 to ground and an alternating current voltage of the output negative terminal 142 to ground; the main control module 221 is connected to the acquisition module 222 and the switch unit 110, respectively, and is configured to analyze the ac voltage data acquired by the ac acquisition unit 223, and control the switch unit 110 to turn on and off according to an analysis result, for example, the main control module 221 may be a CPU of a model STM32F103RCT 6. The first set voltage threshold and the second set voltage threshold are standard parameters set by a worker and stored in the storage module, for example, the first set voltage threshold and the second set voltage threshold are both 10V; according to different bus and secondary equipment standards, the value of the first set voltage threshold may also be other values, and the value of the second set voltage threshold may also be other values, which is not specifically limited herein.
In the working process of the secondary equipment of the transformer substation, the switch unit 110 is switched on, the input terminal 130 of the detection device 100 for the alternating-current series-connection direct-current system is connected with a direct-current bus of the transformer substation, and the output terminal 140 is connected with the secondary equipment in the transformer substation to provide direct-current power for the secondary equipment; the alternating current acquisition unit 223 of the acquisition module 222 acquires the alternating current voltage of the output positive terminal 141 to the ground and the alternating current voltage of the output negative terminal 142 to the ground and transmits the alternating current voltages to the main control module 221; the main control module 221 performs data processing on the data acquired by the acquisition module 222, for example, data packing, data cleaning, invalid data removing, and the like, and then determines whether the absolute value of the ground alternating voltage of the output positive terminal 141 is greater than a first set voltage threshold and/or the absolute value of the ground alternating voltage of the output negative terminal 142 is greater than a second set voltage threshold; if yes, the main control module 221 determines that the alternating current signal in the direct current system of the transformer substation exceeds the standard, controls the switch unit 110 to be turned off, and cuts off the connection between the secondary equipment and the direct current system of the transformer substation to prevent the secondary equipment from being failed caused by the alternating current signal; if not, the main control module 221 determines that the alternating current signal in the direct current system of the transformer substation is in the safety range, and controls the switch unit 110 to be kept on.
The detection device for the alternating current series-connection direct current system is connected between a direct current bus and secondary equipment, the main control module controls the on and off of the switch unit according to the size of an alternating current component in an electric signal input into the secondary equipment, the alternating current quantity of the direct current system of the transformer substation exceeds the standard, the secondary equipment mistakenly sending remote signaling and circuit faults caused by the fact that the alternating current component is connected into the direct current system in series are avoided, the potential safety hazard of the direct current system is reduced, and the reliability of the direct current system is improved.
Fig. 3 is a schematic diagram of another detection apparatus for detecting an ac series-connected dc system according to an embodiment of the present invention, referring to fig. 3, optionally, the switch control circuit 120 further includes: and the driving circuit 323 is connected between the main control module 221 and the switch unit 110, and is configured to process a control signal from the main control module 221 to the switch unit 110 and output the processed control signal to the switch unit 110, so as to implement a large-current switching function of the switch unit 110.
The driving circuit 323 is an intermediate circuit located between the main control module 221 and the switch unit 110, and is configured to process a control signal of the main control module 221.
Exemplarily, when the main control module 221 determines that an alternating current signal in a direct current system of a transformer substation exceeds a standard, the main control module 221 sends a turn-off instruction to the driving circuit 323, the driving circuit 323 amplifies the received turn-off instruction and sends the amplified turn-off instruction to the switch unit 110 to control the switch unit 110 to turn off, so that the connection between the secondary equipment and the direct current system of the transformer substation is cut off, and the secondary equipment fault caused by the alternating current signal is prevented; when the main control module 221 determines that the alternating current signal in the direct current system of the transformer substation is in a normal range, the main control module sends a conduction maintaining instruction to the driving circuit 323, and the driving circuit 323 amplifies the received conduction maintaining instruction and sends the amplified conduction maintaining instruction to the switch unit 110 to control the switch unit 110 to keep conducting.
The detection device for the alternating current series-connection direct current system is connected between a direct current bus and secondary equipment, a control instruction sent by a main control module is processed and sent to a switch unit by a driving circuit, the switch unit is controlled to complete the conduction and the turn-off of a large current, the alternating current amount of the direct current system of a transformer substation exceeds the standard, the secondary equipment mistaken sending of remote signaling and circuit faults caused by the fact that an alternating current component is connected in series with the direct current system are avoided, the potential safety hazard of the direct current system is reduced, and the reliability of the direct current system is improved.
Fig. 4 is a schematic diagram of another detection apparatus for detecting ac series-connected dc system according to an embodiment of the present invention, referring to fig. 4, optionally, the input terminal 130 includes: an input positive terminal 431, an input negative terminal 432, and a ground terminal 433; the acquisition module 222 further includes: the dc acquisition unit 424, the dc acquisition unit 424 is electrically connected to the input positive terminal 431, the input negative terminal 432 and the ground terminal 433 respectively, and is configured to acquire a dc voltage between the input positive terminal 431 and the input negative terminal 432, an input positive terminal 431 to ground dc voltage and an input negative terminal 432 to ground dc voltage, and send the dc voltage to the main control module 221.
The input positive terminal 431 is connected with a positive electrode line of the substation direct-current bus, and the input negative terminal 432 is connected with a negative electrode line of the substation direct-current bus; the ground terminal 433 is respectively connected to the ground and the acquisition module 222 to realize the acquisition of the voltage to ground by the acquisition module 222; the main control module 221 is further configured to analyze the dc voltage data collected by the dc collecting unit 424.
For example, the main control module 221 determines whether the dc voltage between the input positive terminal 431 and the input negative terminal 432, the dc voltage of the input positive terminal 431 to ground, and the dc voltage of the input negative terminal 432 to ground are within a set range, so as to remind a worker to perform corresponding maintenance work.
The detection device of the alternating current series-connection direct current system provided by the embodiment is connected between a direct current bus and secondary equipment, the switch unit can be controlled to complete the on-off of a large current, the direct current acquisition unit can also acquire the direct current voltage of the input detection device, and whether the acquired direct current voltage is in a normal range is judged, so that a worker is reminded to correspondingly overhaul, the monitoring of the alternating current amount of the transformer substation direct current system exceeding the standard and the direct current signal value is realized, the phenomenon that the secondary equipment caused by the alternating current component series-connection direct current system mistakenly sends remote signaling and circuit faults is avoided, the potential safety hazard of the direct current system is reduced, and the reliability of the direct current system is improved.
Fig. 5 is a schematic diagram of another detection apparatus for detecting ac series-in dc system according to an embodiment of the present invention, referring to fig. 5, the switch unit 110 optionally includes a first control switch S1 and a second control switch S2, the first control switch S1 is connected between the input positive terminal 431 and the output positive terminal 141, and the second control switch S2 is connected between the input negative terminal 432 and the output negative terminal 142.
For example, the first control switch S1 and the second control switch S2 may be MOS transistors, and their turn-on and turn-off are controlled by the main control module 221 to provide a high current switching function for the detection apparatus.
The detection device for the alternating current series-connection direct current system is connected between the direct current bus and the secondary equipment, can control the switch unit to complete the on-off of the large current, realizes the monitoring of the exceeding of the alternating current quantity of the direct current system of the transformer substation and the monitoring of the direct current signal value, avoids the phenomenon that the secondary equipment mistakenly sends remote signaling and circuit faults caused by the fact that the alternating current component is connected in the direct current system in series, reduces the potential safety hazard of the direct current system, and improves the reliability of the direct current system.
Fig. 6 is a schematic diagram of another detection apparatus for detecting an ac series-connected dc system according to an embodiment of the present invention, referring to fig. 6, optionally, the detection apparatus 100 for detecting an ac series-connected dc system further includes: the indication module 650, the indication module 650 includes an access indication unit 651, an operation indication unit 652 and a fault indication unit 653, the access indication unit 651, the operation indication unit 652 and the fault indication unit 653 are all electrically connected to the main control module 221, the access indication unit 651 is configured to send a first indication signal when receiving an access success signal of the main control module 221, the operation indication unit 652 is configured to send a second indication signal when receiving a normal operation signal of the main control module 221, the fault indication unit 653 is configured to send a third indication signal when receiving a fault signal of the main control module 221, and the first indication signal, the second indication signal and the third indication signal are different.
Illustratively, the access indicating unit 651, the operation indicating unit 652 and the fault indicating unit 653 are LED lamps of yellow, green and red, respectively, and correspondingly, the first indicating signal, the second indicating signal and the third indicating signal are respectively a yellow lamp, a green lamp and a red lamp; when the detection device 100 for the alternating current series connection into the direct current system is successfully connected between the direct current bus and the secondary equipment, the main control module 221 sends a successful connection signal to the indicating module 650, and at the moment, the yellow LED lamp is turned on; when the main control module 221 determines that no ac signal exists in the dc system and the dc signal value is normal, it sends a normal operation signal to the indicating module 650, and at this time, the green LED lamp is turned on; when the main control module 221 judges that an alternating current signal is connected in series or the direct current signal value is abnormal in the direct current system, a fault signal is sent to the indicating module 650, and at the moment, the red LED lamp is turned on; in addition, if the main control module 221 determines that an alternating current signal is connected in series in the direct current system, a turn-off instruction is also sent to the driving circuit 323, the driving circuit 323 amplifies the received turn-off instruction and sends the amplified turn-off instruction to the switch unit 110 to control the switch unit 110 to turn off, so that the connection between the secondary equipment and the direct current system of the substation is cut off, and the secondary equipment fault caused by the alternating current signal is prevented.
The detection device for the alternating current series-connection direct current system is connected between the direct current bus and the secondary equipment, can control the switch unit to complete the on-off of the large current, realizes the monitoring of the exceeding of the alternating current quantity of the direct current system of the transformer substation and the monitoring of the direct current signal value, avoids the phenomenon that the secondary equipment mistakenly sends remote signaling and circuit faults caused by the fact that the alternating current component is connected in the direct current system in series, reduces the potential safety hazard of the direct current system, and improves the reliability of the direct current system.
Fig. 7 is a schematic diagram of another detection apparatus for detecting an ac series-connected dc system according to an embodiment of the present invention, referring to fig. 7, optionally, the switch control circuit 120 further includes: and the storage module 760, where the storage module 760 is connected to the main control module 221, and is configured to store the fault recording data when receiving the fault signal of the main control module 221.
The storage module 760 is a storage device controlled by the master control module 221 to store data, and the storage module 760 may be a memory chip with model SDINBDG 4-8G.
It should be noted that the storage module 760 may be used to store the voltage data collected by the collection module 222 in addition to the fault recording data.
Illustratively, the main control module 221 performs data processing on the data acquired by the acquisition module 222, where the data processing includes operations such as data packing, data cleaning, and invalid data removing, and transmits the processed data to the storage module 760 for storage; when the main control module 221 determines that the alternating current signal in the direct current system of the transformer substation exceeds the standard, the main control module 221 sends a fault signal to the storage module 760, and the storage module 760 is used for performing wave recording of at least 200 sets of fault data within 10s and storing the fault wave recording data.
The detection device of the alternating current series-connection direct current system provided by the embodiment is connected between a direct current bus and secondary equipment, the switch unit can be controlled to complete the on-off of a large current, the monitoring of the alternating current quantity of the direct current system of a transformer substation exceeding the standard and the monitoring of a direct current signal value are realized, the storage module can carry out fault recording and data storage, the secondary equipment mistaken sending remote signaling and circuit faults caused by the fact that the alternating current component is connected in series with the direct current system are avoided, the overhaul of maintainers is facilitated, the potential safety hazard of the direct current system is reduced, and the reliability of the direct current system is improved.
Fig. 8 is a schematic diagram of another detection apparatus for detecting ac series into a dc system according to an embodiment of the present invention, referring to fig. 8, optionally, the detection apparatus 100 for detecting ac series into a dc system further includes: the communication circuit 870 is connected with the main control module 221 and the upper computer 880 and used for uploading fault recording data to the upper computer 880.
Exemplarily, when the main control module 221 determines that an alternating current signal is connected in the direct current system of the substation in series, the main control module 221 sends a turn-off instruction to the driving circuit 323, the driving circuit 323 amplifies the received turn-off instruction and sends the amplified turn-off instruction to the switch unit 110 to control the switch unit 110 to turn off, so as to cut off the connection between the secondary device and the direct current system of the substation and prevent a secondary device fault caused by the alternating current signal; meanwhile, the main control module 221 sends a fault signal to the communication circuit 870 and the storage module 760, the storage module 760 stores fault recording data, and the communication circuit 870 sends the fault recording data to the upper computer 880.
The detection device of the direct current system is gone into to alternating current cluster that this embodiment provided, connect between direct current generating line and secondary equipment, can control switch unit and accomplish switching on and off of heavy current and realized the control that the alternating current volume of transformer substation direct current system exceeds standard and direct current signal value, communication module can transmit the trouble record wave to the host computer, supply the maintainer to look over, secondary equipment mistake that the alternating current component cluster goes into direct current system and has sent remote letter and circuit fault, the maintenance of maintainer has been made things convenient for, direct current system's potential safety hazard has been reduced, direct current system's reliability has been improved.
Optionally, the detection apparatus for a series ac to dc system further includes: the display module is electrically connected with the acquisition module 222 and the storage module 760 respectively, and is used for setting a first set voltage threshold and a second set voltage threshold before detection and displaying data acquired by the acquisition module 222 in real time in the detection process; the power supply module is respectively connected with the switch control circuit 110, the indication module 650, the driving circuit 323, the upper computer 880 and the communication circuit 870, and is used for supplying power to the switch control circuit 110, the indication module 650, the driving circuit 323, the upper computer 880 and the communication circuit 870.
The embodiment of the invention also provides a detection method for the alternating current series connection into the direct current system. Fig. 9 is a flowchart of a method for detecting an ac series-connected dc system according to this embodiment, where the method is executed by any one of the apparatuses for detecting an ac series-connected dc system according to this embodiment of the present invention, and referring to fig. 9, the method for detecting an ac series-connected dc system includes:
and step 901, the switch control circuit controls the conduction state of the switch unit according to the output positive terminal to ground alternating voltage and/or the output negative terminal to ground alternating voltage.
Specifically, in the working process of secondary equipment of the transformer substation, the switch unit is switched on, an input terminal of a detection device of an alternating current series-connection direct current system is connected with a direct current bus of the transformer substation, an output terminal is connected with the secondary equipment in the transformer substation to provide a direct current power supply for the secondary equipment, a switch control circuit collects alternating current voltage of an output positive terminal to the ground and alternating current voltage of an output negative terminal to the ground, then data processing is carried out on the collected data, for example, data packing, data cleaning, invalid data removing and the like are carried out, and whether the absolute value of the alternating current voltage of the output positive terminal to the ground and/or the absolute value of the alternating current voltage of the output negative terminal to the ground are/; if so, the switch control circuit judges that the alternating current signal in the direct current system of the transformer substation exceeds the standard, controls the switch unit to be switched off, and cuts off the connection between the secondary equipment and the direct current system of the transformer substation to prevent the secondary equipment from being failed caused by the alternating current signal; if not, the switch control circuit judges that the alternating current signal in the direct current system of the transformer substation is in a normal range, and controls the switch unit to be kept conducted.
The detection method of the ac series-connected dc system provided in this embodiment is implemented by using any one of the detection devices of the ac series-connected dc system provided in the present invention, the detection device of the ac series-connected dc system is connected between the dc bus and the secondary device, the switch control circuit collects the ac component in the electrical signal flowing into the secondary device, and whether the alternating current component is larger than a set threshold value or not is judged, whether the alternating current component is connected in series in the direct current system or not is judged, if the alternating current component connected in series in the direct current system exceeds the standard, the switch control circuit can control the switch unit to be switched off, the connection between the secondary equipment and the direct current bus is cut off, the alternating current quantity of the direct current system of the transformer substation exceeds the standard and is monitored, the phenomenon that the secondary equipment mistakenly sends remote signaling and circuit faults caused by the fact that the alternating current component is connected in series in the direct current system is avoided, the potential safety hazard of the direct current system is reduced, and the reliability of the.
Fig. 10 is a flowchart of another method for detecting that ac is connected in series to a dc system according to an embodiment of the present invention, and referring to fig. 10, optionally, the switch control circuit controls a conducting state of the switch unit according to the output positive terminal to ground ac voltage and/or the output negative terminal to ground ac voltage, including:
Specifically, in the working process of the secondary equipment of the transformer substation, the switch unit is switched on, the input terminal of the detection device of the alternating-current series-connection direct-current system is connected with a direct-current bus of the transformer substation, and the output terminal is connected with the secondary equipment in the transformer substation to provide a direct-current power supply for the secondary equipment; an alternating current acquisition unit of the acquisition module acquires an output positive terminal earth alternating voltage and an output negative terminal earth alternating voltage and transmits the output positive terminal earth alternating voltage and the output negative terminal earth alternating voltage to the main control module; the main control module performs data processing on the data acquired by the acquisition module, such as data packing, data cleaning, invalid data removing and the like, and then judges whether the absolute value of the ground alternating voltage of the output positive terminal and/or the absolute value of the ground alternating voltage of the output negative terminal is larger than a set threshold value or not; if yes, the main control module judges that an alternating current signal is connected in series in the direct current system of the transformer substation, controls the switch unit to be switched off, and cuts off the connection between the secondary equipment and the direct current system of the transformer substation to prevent secondary equipment faults caused by the alternating current signal; if not, the main control module judges that no alternating current signal exists in the direct current system of the transformer substation, and controls the switch unit to be kept conducted.
According to the detection method for the alternating current series-connection direct current system, any detection device for the alternating current series-connection direct current system provided by the invention is connected between the direct current bus and the secondary equipment, the main control module controls the on and off of the switch unit according to the size of the alternating current component in the electric signal input into the secondary equipment, the alternating current quantity of the direct current system of the transformer substation is monitored in an over-standard mode, the phenomenon that the secondary equipment mistakenly sends remote signaling and circuit faults due to the fact that the alternating current component is connected into the direct current system in series is avoided, the potential safety hazard of the direct current system is reduced, and the reliability of the direct current system is improved.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A device for detecting the series of ac into dc systems, comprising: a switch unit, a switch control circuit, an input terminal, and an output terminal;
the switch unit is connected between the input terminal and the output terminal, and the output terminal comprises an output positive terminal and an output negative terminal; the switch control circuit is electrically connected with the output positive terminal and the output negative terminal respectively and used for controlling the switch unit to be switched on and off according to the output positive terminal to ground alternating voltage and/or the output negative terminal to ground alternating voltage.
2. The apparatus for detecting an ac series-in dc system according to claim 1, wherein said switching control circuit comprises:
the acquisition module comprises an alternating current acquisition unit, and the alternating current acquisition unit is used for acquiring the alternating current voltage of the output positive terminal to the ground and the alternating current voltage of the output negative terminal to the ground;
the main control module is connected with the alternating current acquisition unit and used for controlling the switch-on and switch-off of the switch unit according to the relation between the absolute value of the alternating current voltage of the output positive terminal to the ground and a first set voltage threshold value and/or the relation between the absolute value of the alternating current voltage of the output negative terminal to the ground and a second set voltage threshold value acquired by the alternating current acquisition unit.
3. The apparatus for detecting an ac series-in dc system of claim 2, wherein said switching control circuit further comprises:
and the driving circuit is connected between the main control module and the switch unit and is used for processing a control signal from the main control module to the switch unit and then outputting the processed control signal to the switch unit.
4. The apparatus for detecting an AC series-to-DC system according to claim 2,
the input terminal includes: an input positive terminal, an input negative terminal, and a ground terminal;
the acquisition module further comprises: the direct current acquisition unit, the direct current acquisition unit respectively with input positive terminal, input negative terminal and ground terminal electricity are connected, are used for gathering the input positive terminal with direct current voltage between the input negative terminal the input positive terminal to ground direct current voltage with the input negative terminal is to ground direct current voltage, and send to main control module.
5. The apparatus of claim 4, wherein the switch unit comprises a first control switch and a second control switch, the first control switch is connected between the positive input terminal and the positive output terminal, and the second control switch is connected between the negative input terminal and the negative output terminal.
6. The apparatus for detecting an ac-to-dc serial system according to claim 2, further comprising: the indicating module, indicating module is including inserting indicating unit, operation indicating unit and trouble indicating unit, insert indicating unit the operation indicating unit with trouble indicating unit all with the host system electricity is connected, it is used for receiving to insert indicating unit sends first pilot signal when host system's the successful signal of access, operation indicating unit is used for receiving send second pilot signal when host system's normal operating signal, trouble indicating unit is used for receiving send third pilot signal when host system's fault signal, first pilot signal the second pilot signal with third pilot signal is respectively different.
7. The apparatus for detecting an ac series-in dc system of claim 2, wherein said switching control circuit further comprises: and the storage module is connected with the main control module and used for storing fault recording data when receiving the fault signal of the main control module.
8. The apparatus for detecting an ac-to-dc serial system according to claim 7, further comprising: the communication circuit is connected with the main control module and the upper computer and is used for uploading the fault recording data to the upper computer.
9. A method for detecting an ac series-in dc system, which is performed by the apparatus for detecting an ac series-in dc system according to any one of claims 1 to 8, the method comprising:
the switch control circuit controls the conduction state of the switch unit according to the output positive terminal-to-ground alternating current voltage and/or the output negative terminal-to-ground alternating current voltage.
10. The method for detecting the AC-series DC system of claim 1, wherein the switch control circuit controls the conduction state of the switch unit according to the AC voltage to ground from the positive output terminal and/or the AC voltage to ground from the negative output terminal comprises:
the alternating current acquisition unit acquires the alternating current voltage of the output positive terminal to the ground and the alternating current voltage of the output negative terminal to the ground;
the main control module controls the switch unit to be switched on and off according to the relation between the absolute value of the output positive terminal to ground alternating voltage and a first set voltage threshold value and/or the relation between the absolute value of the output negative terminal to ground alternating voltage and a second set voltage threshold value, wherein the relation is acquired by the alternating current acquisition unit.
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| CN202011487732.XA CN112666413A (en) | 2020-12-16 | 2020-12-16 | Detection device and method for alternating current series connection into direct current system |
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| CN202011487732.XA CN112666413A (en) | 2020-12-16 | 2020-12-16 | Detection device and method for alternating current series connection into direct current system |
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Application publication date: 20210416 |