CN114156837A - H-bridge cascaded SVG black module redundancy method, control protection device and redundancy system - Google Patents
H-bridge cascaded SVG black module redundancy method, control protection device and redundancy system Download PDFInfo
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- CN114156837A CN114156837A CN202111268582.8A CN202111268582A CN114156837A CN 114156837 A CN114156837 A CN 114156837A CN 202111268582 A CN202111268582 A CN 202111268582A CN 114156837 A CN114156837 A CN 114156837A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
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Abstract
The invention provides a redundancy method, a control protection device and a redundancy system for H-bridge cascaded SVG black modules, which comprise the steps of sending a bypass instruction to a black module after the black module appears in an SVG device; judging whether the black module is successfully bypassed or not by adopting a current unlocking technology from the moment of sending the bypass instruction to the moment of reaching a first preset time length T1, and controlling the SVG device to be switched to normal operation if the bypass is successful; otherwise, the bypass fails, and the SVG device is controlled to trip. By adopting the redundancy method and the control protection device thereof, the H-bridge cascaded SVG device can be maintained without directly tripping after a black module appears, and the tripping probability of the SVG device is reduced by judging the bypass state of the black module and then determining the running state of the device according to the bypass state.
Description
Technical Field
The invention belongs to the technical field of power electronic application, and mainly relates to a redundancy method, a control protection device and a redundancy system for an H-bridge cascaded SVG black module.
Background
In order to realize the double-carbon targets of carbon peak reaching and carbon neutralization, energy is taken as an important link, and electric power is used for constructing a novel electric power system taking new energy as a main body. New energy sources such as solar energy, wind power and the like are increasingly and widely accessed; and the access of new energy is accompanied with the access of a large amount of reactive power compensation equipment, and the SVG is widely applied to wind power plants or wind power collection stations and various industrial users as a quick reactive power compensation equipment. A Static Var Generator (Static Var Generator) is a core device of advanced flexible communication technology. The SVG operation stability has important significance for stabilizing the bus voltage of the collection station, supporting the voltage at the tail end of the power transmission line, controlling the power quality in the industrial field and the like. The SVG has the advantages of high adjusting speed, wide adjusting range and the like, and is widely applied to the industries of new energy power generation, power transmission and distribution lines, electrified railways, metallurgy, coal and the like. The device has the functions of inhibiting voltage fluctuation, unbalance and the like and improving the quality of electric energy; the system has the advantages that dynamic voltage support is provided, the stability of a power system is improved, and the alternating current and direct current long-distance power transmission capacity is improved; the method has the functions of increasing the damping of the power system, inhibiting subsynchronous oscillation and the like.
Along with the promotion accumulation of technique, the operating stability of SVG device is higher and higher. The problems of control and the like appearing at the initial stage of the product are gradually solved, and the module problem becomes more and more prominent. The black modules (the black modules refer to the situation that after the uplink optical fiber of the sub-module loses communication with the control protection device or receives a bypass instruction, the bypass cannot be performed (namely, the power module is not controlled) due to software or hardware faults) increasingly appear in the actual engineering. The current industry deals with black modules as replacement or repair after device failure exits, thus resulting in increased device trip probability. Improving the automatic redundancy probability of the black module becomes one of the main factors for improving the operation stability of the device.
Factors for restricting stable operation of the H-bridge cascaded SVG are many, and along with the progress of the technology and the accumulation of the technology of various manufacturers, the stability of the equipment is greatly improved. However, with the increase of the input quantity of the SVG, the control stability is improved, the probability of tripping of the device is increased due to the communication problem between the control protection device and the sub-modules, and the tripping caused by the fault of a single sub-module becomes an important factor influencing the stable operation of the SVG. The traditional industry generally adopts a mode of bypassing the redundancy of the SVG sub-module to process the problem of the sub-module. However, when the communication between the sub-module and the control protection device is abnormal, the state of the sub-module cannot be normally known, and the bypass command cannot be effectively sent to the sub-module to be reliably executed (the state module is a black module). In order to solve the problem, the SVG device is generally withdrawn, the fault submodule is checked, and the SVG device is put into operation after the problem of the communication link is solved. This mode will increase the device trip number of times, has influenced the operating stability of SVG device.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a redundancy method, a control protection device and a redundancy system for an H-bridge cascaded SVG black module.
In a first aspect, the invention provides a method for redundancy of an H-bridge cascaded SVG black module, and the improvement is that the method comprises the following steps:
when a black module appears in the SVG device, sending a bypass instruction to the black module;
judging whether the black module is successfully bypassed or not by adopting a current unlocking technology from the moment of sending the bypass instruction to the moment of reaching a first preset time length T1, and controlling the SVG device to be switched to normal operation if the bypass is successful; otherwise, the bypass fails, and the SVG device is controlled to trip.
Further, after a black module appears in the SVG device and before a bypass instruction is sent to the black module, the method further includes:
judging whether the number of bypass sub-modules in the phase of the black module is out of limit;
if the limit is not out of limit, sending a bypass instruction to the black module; otherwise, controlling the SVG device to trip.
Further, the determining whether the black module is bypassed successfully by using a current unlocking technique includes:
unlocking the SVG device according to a preset current;
acquiring actual output current of the SVG device and diode charging current in the black module after unlocking;
if the actual output current of the SVG device is not equal to the diode charging current in the black module, the black module bypass is successful; otherwise, the black module bypass fails.
Further, the preset current for unlocking the SVG device is adopted to be not more than 20% of the rated current of the SVG device.
Further, the condition for judging the appearance of the black module in the SVG device includes:
and acquiring uplink communication signals of all sub-modules in the SVG device in real time, and if the uplink communication signals of at least one sub-module are not received within a second preset time period T2, considering that the at least one sub-module is a black module.
Further, the first preset time length T1 is not less than the preset time length T3 for the black module to receive the bypass instruction, the preset time length T4 for the black module to execute the bypass, and the preset time length T5 for the black module to return to the bypass completion signal;
the T4 is the maximum of the two:
the black module executes the time length of the bypass according to the bypass instruction;
and the black module executes the duration of the active bypass according to a preset sequential logic.
In a second aspect, the present invention also provides a control and protection device, the improvement comprising:
the condition module is used for jumping to the instruction sending module after a black module appears in the SVG device;
the instruction sending module is used for sending a bypass instruction to the black module;
the execution module judges whether the black module is successfully bypassed or not by adopting a current unlocking technology from the moment of sending the bypass instruction to the moment of reaching a first preset time T1, and jumps to the operation control module if the bypass is successful; otherwise, jumping to a tripping control module if the bypass fails;
the operation control module is used for controlling the SVG device to be switched to normal operation;
and the tripping control module is used for controlling the tripping of the SVG device.
Further, the apparatus further comprises:
the out-of-limit judging module is used for judging whether the number of bypass sub-modules in the phase of the black module is out of limit or not;
if the limit is not out of limit, jumping to the instruction sending module; otherwise, jumping to the tripping control module.
Further, the execution module is specifically configured to:
unlocking the SVG device according to a preset current from the moment of sending the bypass instruction to the moment of reaching a first preset time T1;
acquiring actual output current of the SVG device and diode charging current in the black module after unlocking;
if the actual output current of the SVG device is not equal to the charging current of the diode in the black module, the bypass of the black module is successful, and the operation control module is jumped to;
otherwise, the black module bypass fails and jumps to the trip control module.
Further, the preset current for unlocking the SVG device is adopted to be not more than 20% of the rated current of the SVG device.
Further, the condition for judging the occurrence of the black module in the SVG device in the condition module includes:
and acquiring uplink communication signals of all sub-modules in the SVG device in real time, and if the uplink communication signals of at least one sub-module are not received within a second preset time period T2, considering that the at least one sub-module is a black module.
Further, the first preset time length T1 is not less than the preset time length T3 for the black module to receive the bypass instruction, the preset time length T4 for the black module to execute the bypass, and the preset time length T5 for the black module to return to the bypass completion signal;
the T4 is the maximum of the two:
the black module executes the time length of the bypass according to the bypass instruction;
and the black module executes the duration of the active bypass according to a preset sequential logic.
In a third aspect, the invention further provides a redundancy method for the H-bridge cascaded SVG black module, and the improvement is that the redundancy method comprises the following steps:
when the control protection device confirms that the black module appears in the SVG device, the control protection device sends a bypass instruction to the black module;
the black module selects a bypass execution mode according to whether a bypass command sent by the control protection device is received or not through a preset delay;
the control protection device judges whether the black module is successfully bypassed or not by adopting a current unlocking technology from the moment of sending the bypass instruction to the moment of reaching a first preset time length T1, and if the bypass is successful, the SVG device is controlled to be switched to normal operation; otherwise, the bypass fails, and the SVG device is controlled to trip.
Further, the black module selects a bypass execution mode according to whether a bypass command sent by the control protection device is received, including:
if the black module receives a bypass instruction sent by the control protection device after the delay time T3, the black module executes bypass according to the bypass instruction;
and if the black module does not receive the bypass instruction sent by the control protection device after the delay time T3, the black module executes active bypass according to a preset time sequence logic.
In a fourth aspect, the present invention further provides an H-bridge cascaded SVG black module redundancy system, which is characterized by comprising:
control protection means for performing the method according to any one of claims 1 to 6;
and the black module is used for selecting a bypass execution mode according to whether the black module receives a bypass command sent by the control protection device.
Further, the black module is specifically configured to:
if the black module receives a bypass instruction sent by the control protection device after the delay time T3, the black module executes bypass according to the bypass instruction;
and if the black module does not receive the bypass instruction sent by the control protection device after the delay time T3, the black module executes active bypass according to a preset time sequence logic.
One or more technical schemes of the invention at least have one or more of the following beneficial effects:
(1) the invention provides a H-bridge cascaded SVG black module redundancy method and a control protection device thereof, wherein the method comprises the steps of sending a bypass instruction to a black module after the black module appears in an SVG device; judging whether the black module is successfully bypassed or not by adopting a current unlocking technology from the moment of sending the bypass instruction to the moment of reaching a first preset time length T1, and controlling the SVG device to be switched to normal operation if the bypass is successful; otherwise, the bypass fails, and the SVG device is controlled to trip. By adopting the redundancy method and the control protection device thereof, the H-bridge cascaded SVG device can be maintained without direct tripping after a black module appears, and the running state of the device is determined according to the bypass state by judging the bypass state of the black module, so that the tripping probability of the SVG device is reduced, and the stability of the whole SVG device is improved;
(2) the invention provides an H-bridge cascaded SVG black module redundancy method and a control protection device thereof, which can not affect the operation of the original device and the original redundancy logic on the premise of not changing the original operation state of the device, and are simple and reliable.
(3) The invention provides a redundancy method and a redundancy system for an H-bridge cascaded SVG black module, wherein the black module selects a bypass execution mode according to whether a bypass command sent by a control protection device is received, so that when the control protection device sends a downlink communication signal to the black module and is abnormal, the black module can also select to execute an active bypass according to a preset time sequence logic, so that the success probability of the black module bypass is improved, and the tripping probability of the SVG device is further reduced.
Drawings
Fig. 1 is a schematic flowchart of a method for redundancy of H-bridge cascaded SVG black modules according to embodiment 1 of the present invention;
FIG. 2 is a schematic diagram of determining whether the number of bypass sub-modules is out of limit according to an embodiment of the present invention;
fig. 3 is a schematic view of an operation state of a submodule of an H-bridge cascaded SVG device according to an embodiment of the present invention; wherein, fig. 3(a) is a schematic view of a charging state of the sub-module, fig. 3(b) is a schematic view of a discharging state of the sub-module, and fig. 3(c) is a schematic view of a follow current state of the sub-module;
FIG. 4 is a schematic diagram of a single submodule latching current provided in an embodiment of the present invention;
fig. 5 is a schematic waveform diagram of the SVG device when a large current fails to unlock the SVG device according to the embodiment of the present invention;
fig. 6 is a schematic waveform diagram of the SVG device when the SVG device is successfully unlocked by using a small current in an attempt according to the embodiment of the present invention;
fig. 7 is a schematic waveform diagram of the SVG device when attempting to unlock the SVG device with a small current fails according to the embodiment of the present invention;
fig. 8 is a schematic flowchart of a method for redundancy of an H-bridge cascaded SVG black module according to embodiment 2 of the present invention;
fig. 9 is a schematic flowchart of a method for redundancy of an H-bridge cascaded SVG black module according to embodiment 3 of the present invention.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The invention provides a redundancy method for H-bridge cascaded SVG black modules, which is applied to a control protection device of SVG, and comprises the following steps as shown in figure 1:
s11, when a black module appears in the SVG device, sending a bypass instruction to the black module;
s12, judging whether the black module is successfully bypassed or not by adopting a current unlocking technology from the moment of sending the bypass instruction to the moment of reaching a first preset time length T1, and controlling the SVG device to be switched to normal operation if the bypass is successful; otherwise, the bypass fails, and the SVG device is controlled to trip.
In an optional technical content of the present invention, in the step S11, after the black module appears in the SVG device and before the bypass instruction is sent to the black module, the method may further include:
judging whether the number of bypass sub-modules in a bridge arm where the black module is positioned exceeds a limit or not;
if the limit is not out of limit, sending a bypass instruction to the black module; otherwise, controlling the SVG device to trip.
As shown in fig. 2, the step S11 can be disassembled into the following steps:
s111, confirming that a black module appears in the SVG device;
s112, judging whether the number of bypass sub-modules in the phase of the black module is out of limit, and if not, executing the step S113; otherwise, controlling the SVG device to trip;
and S113, sending a bypass instruction to the black module.
In step S11 or step S111, the condition for determining that the SVG device has a black module is:
and acquiring uplink communication signals of all sub-modules in the SVG device in real time, and if the uplink communication signals of at least one sub-module are not received within a second preset time period T2, considering that the at least one sub-module is a black module.
In an optional technical content of the present invention, in the step S12, the first preset time length T1 is not less than the preset time length T3 when the black module receives the bypass instruction, the preset time length T4 when the black module executes the bypass, and the preset time length T5 when the black module returns the bypass completion signal;
the T4 is the maximum of the two:
the black module executes the time length of the bypass according to the bypass instruction;
and the black module executes the duration of the active bypass according to a preset sequential logic.
In an optional technical content of the present invention, in the step S12, the determining whether the black module is successfully bypassed by using a current unlocking technique may include:
s121, unlocking the SVG device according to a preset current;
s122, collecting the actual output current of the SVG device after unlocking and the diode charging current in the black module;
s123, if the actual output current of the SVG device is not equal to the diode charging current in the black module, the black module bypass is successful; otherwise, the black module bypass fails.
In the operation process of the H-bridge cascaded SVG device, the sub-modules have several operation states, and the operation states are shown in FIG. 3. The operation process includes a charging state as shown in fig. 3a, in which only the diode is conducting, a discharging state as shown in fig. 3b, and a conducting freewheeling state as shown in fig. 3c, and at this time, the diode and the IGBT are conducting cooperatively.
Preferably, if single module appears shutting in the cascaded SVG operation of H bridge, single module will be in charged state, results in SVG device output current different with normal operating. When the single sub-module is locked, the output current of the single module IGBT and the diode is shown in figure 4, and the output current of the SVG device is consistent with the current of the sub-module.
In the step S12, the control protection device may unlock the SVG device according to a small current, and after the SVG is unlocked, determine whether the current is a diode charging current according to an actual current output, and if the current is the diode charging current, determine that the trial unlocking fails, determine that the black module bypass fails, determine that the device trips, and exit the device; if the current is not the diode charging current, the bypass of the black module is successful, and the device is converted into a normal operation state.
If the trial unlocking is successful, judging that the black module bypass is successful, outputting the device according to a normal instruction, and recovering the device to a normal operation state; if the unlocking trial fails, the bypass of the black module is judged to fail, and the device needs to be locked and tripped as soon as possible.
Based on the characteristics disclosed in fig. 4, by using the characteristics, it can be determined whether the sub-module locking exists in the phase by judging the current. In the phase, only the state control protection device of the black module cannot know the state, so if the locking submodule is determined to be the black module, the bypass failure of the black module is judged, and the process of determining whether the black module is successfully bypassed or not in the mode is defined as a bypass trial unlocking process. The magnitude of bypass trial unlocking current determines the charging speed of the black module when the bypass fails, so that the safety of the sub-module during trial unlocking is ensured by adopting a low-current down-trial unlocking mode. And if the uplink and downlink communication from the protection device to the submodule is abnormal, adopting a submodule active bypass adding and unlocking mode to realize submodule bypass. The sub-module active bypass means that when the downlink communication from the control protection device to the sub-module is abnormal, the sub-module automatically bypasses the sub-module according to a logic time sequence, and the control protection device bypasses the sub-module according to the logic.
Preferably, in the operation process of the H-bridge cascaded SVG, the single module locks up the physical characteristics of the phase-rectifying current. In the normal operation process of the H-bridge cascaded SVG, all the submodules carry out turn-on and turn-off of the IGBT and the diode according to a normal modulation method, and if single submodule fault locking occurs, the physical characteristic of the phase-locked current is expressed as diode charging current.
And after the uplink communication of the sub-module to the control protection device is abnormal, confirming the state of the black module in a trial unlocking mode. After the black module appears, the protection device is controlled to execute the black module bypass logic, a sub-module bypass command is issued, and the sub-module executes the bypass command after receiving the bypass command; however, whether the sub-module is successfully bypassed is not determined, and a novel redundancy mode pilot-test unlocking function needs to be adopted for verification.
Illustratively, the trial unlocking is performed by adopting small-current trial unlocking, and the small-current trial unlocking can be performed by adopting no more than 20% of rated current of the SVG device. If large-current trial unlocking is adopted and the black module is not bypassed successfully, the problem of module damage caused by too fast direct-current voltage charging of the module is easy to occur, and an RTDS (real time digital system) waveform diagram of the module damage caused by large-current trial unlocking failure is shown in fig. 5.
In the trial unlocking process, whether trial unlocking is successful is determined by judging the output current, and then whether the bypass of the black module is successful is determined; the SVG performs trial unlocking verification according to a certain current; and if the operation is normal within a certain time after unlocking and the diode charging current does not appear, the black module bypass is considered to be successful. The RTDS waveform after successful unlocking using a small current trial is shown in fig. 6. If the trial unlocking current is the diode charging current, the black module bypass is determined to be failed, and the RTDS waveform adopting the small current trial unlocking failure is shown in the attached figure 7.
Based on the same inventive concept, the invention also provides a control protection device, which comprises the following components:
the condition module is used for jumping to the instruction sending module after a black module appears in the SVG device;
the instruction sending module is used for sending a bypass instruction to the black module;
the execution module judges whether the black module is successfully bypassed or not by adopting a current unlocking technology from the moment of sending the bypass instruction to the moment of reaching a first preset time T1, and jumps to the operation control module if the bypass is successful; otherwise, jumping to a tripping control module if the bypass fails;
the operation control module is used for controlling the SVG device to be switched to normal operation;
and the tripping control module is used for controlling the tripping of the SVG device.
Preferably, the apparatus further comprises:
the out-of-limit judging module is used for judging whether the number of bypass sub-modules in the phase of the black module is out of limit or not;
if the limit is not out of limit, jumping to the instruction sending module; otherwise, jumping to the tripping control module.
Preferably, the execution module is specifically configured to:
unlocking the SVG device according to a preset current from the moment of sending the bypass instruction to the moment of reaching a first preset time T1;
acquiring actual output current of the SVG device and diode charging current in the black module after unlocking;
if the actual output current of the SVG device is not equal to the charging current of the diode in the black module, the bypass of the black module is successful, and the operation control module is jumped to;
otherwise, the black module bypass fails and jumps to the trip control module.
Preferably, said preset current for unlocking the SVG device takes up no more than 20% of the rated current of the SVG device.
Preferably, the condition for judging the occurrence of the black module in the SVG device in the condition module includes:
and acquiring uplink communication signals of all sub-modules in the SVG device in real time, and if the uplink communication signals of at least one sub-module are not received within a second preset time period T2, considering that the at least one sub-module is a black module.
Preferably, the first preset time period T1 is not less than the preset time period T3 when the black module receives the bypass instruction, the preset time period T4 when the black module executes the bypass, and the preset time period T5 when the black module returns the bypass completion signal;
the T4 is the maximum of the two:
the black module executes the time length of the bypass according to the bypass instruction;
and the black module executes the duration of the active bypass according to a preset sequential logic.
Example 2
The invention also provides a H-bridge cascaded SVG black module redundancy method, as shown in FIG. 8, comprising the following steps:
s21, when the control protection device confirms that the black module appears in the SVG device, the control protection device sends a bypass instruction to the black module;
s22, the black module selects a bypass execution mode according to whether a bypass command sent by the control protection device is received;
s23, controlling the protection device to judge whether the black module is successfully bypassed or not by adopting a current unlocking technology from the moment of sending the bypass instruction to the moment of reaching a first preset time length T1, and controlling the SVG device to be switched to normal operation if the bypass is successful; otherwise, the bypass fails, and the SVG device is controlled to trip.
In an optional technical content of the present invention, in the step S21, after the black module appears in the SVG device and before the bypass instruction is sent to the black module, the method may further include:
judging whether the number of bypass sub-modules in a bridge arm where the black module is positioned exceeds a limit or not;
if the limit is not out of limit, sending a bypass instruction to the black module; otherwise, controlling the SVG device to trip.
As shown in fig. 2, the step S21 can be disassembled into the following steps:
s211, controlling the protection device to confirm that a black module appears in the SVG device;
s212, controlling the protection device to judge whether the number of bypass sub-modules in the phase of the black module exceeds the limit, and if not, executing the step S213; otherwise, controlling the protection device to control the tripping of the SVG device;
and S213, controlling the protection device to send a bypass instruction to the black module.
In step S21 or step S211, the condition for determining that the SVG device has the black module is:
and acquiring uplink communication signals of all sub-modules in the SVG device in real time, and if the uplink communication signals of at least one sub-module are not received within a second preset time period T2, considering that the at least one sub-module is a black module.
In an alternative embodiment of the present invention, in step S22, the black module selects a bypass execution mode according to whether a bypass command sent by the control protection device is received, and may include the following steps:
s221, if the black module receives a bypass instruction sent by the control protection device after the delay time T3, the black module executes bypass according to the bypass instruction;
s222, if the black module does not receive the bypass instruction sent by the control protection device after the delay time T3, the black module executes active bypass according to a preset sequential logic.
After the appearance of a black module with abnormal uplink and downlink communication from the submodule to the control protection device, the bypass cannot be completed by simply adopting a trial unlocking mode, and the active bypass function of the submodule needs to be added. When the sub-module receives the communication abnormity of the control protection device, the black module is directly and actively bypassed according to a preset time sequence logic design, and at the moment, the control protection device also bypasses the black module according to the logic design; after the operation is executed, the SVG device is unlocked according to the trial unlocking logic, whether the black module is successfully bypassed is determined according to the trial unlocking result, and whether the device continues to operate is determined.
In an optional technical content of the present invention, in the step S23, the first preset time length T1 is not less than the preset time length T3 when the black module receives the bypass instruction, the preset time length T4 when the black module executes the bypass, and the preset time length T5 when the black module returns the bypass completion signal;
the T4 is the maximum of the two:
the black module executes the time length of the bypass according to the bypass instruction;
and the black module executes the duration of the active bypass according to a preset sequential logic.
In an optional technical content of the present invention, in the step S23, the determining whether the black module is successfully bypassed by using a current unlocking technique may include:
s231, unlocking the SVG device according to preset current;
s232, collecting actual output current of the SVG device after unlocking and diode charging current in the black module;
s233, if the actual output current of the SVG device is not equal to the diode charging current in the black module, the black module bypass is successful; otherwise, the black module bypass fails.
In the operation process of the H-bridge cascaded SVG device, the sub-modules have several operation states, and the operation states are shown in FIG. 3. The operation process includes a charging state as shown in fig. 3a, in which only the diode is conducting, a discharging state as shown in fig. 3b, and a conducting freewheeling state as shown in fig. 3c, and at this time, the diode and the IGBT are conducting cooperatively.
Preferably, if single module appears shutting in the cascaded SVG operation of H bridge, single module will be in charged state, results in SVG device output current different with normal operating. When the single sub-module is locked, the output current of the single module IGBT and the diode is shown in figure 4, and the output current of the SVG device is consistent with the current of the sub-module.
In the step S23, the control protection device may unlock the SVG device according to a small current, and after the SVG is unlocked, determine whether the current is a diode charging current according to an actual current output, and if the current is the diode charging current, determine that the trial unlocking fails, determine that the black module bypass fails, determine that the device trips, and exit the device; if the current is not the diode charging current, the bypass of the black module is successful, and the device is converted into a normal operation state.
If the trial unlocking is successful, judging that the black module bypass is successful, outputting the device according to a normal instruction, and recovering the device to a normal operation state; if the unlocking trial fails, the bypass of the black module is judged to fail, and the device needs to be locked and tripped as soon as possible.
Based on the characteristics disclosed in fig. 4, by using the characteristics, it can be determined whether the sub-module locking exists in the phase by judging the current. In the phase, only the state control protection device of the black module cannot know the state, so if the locking submodule is determined to be the black module, the bypass failure of the black module is judged, and the process of determining whether the black module is successfully bypassed or not in the mode is defined as a bypass trial unlocking process. The magnitude of bypass trial unlocking current determines the charging speed of the black module when the bypass fails, so that the safety of the sub-module during trial unlocking is ensured by adopting a low-current down-trial unlocking mode. And if the uplink and downlink communication from the protection device to the submodule is abnormal, adopting a submodule active bypass adding and unlocking mode to realize submodule bypass. The sub-module active bypass means that when the downlink communication from the control protection device to the sub-module is abnormal, the sub-module automatically bypasses the sub-module according to a logic time sequence, and the control protection device bypasses the sub-module according to the logic.
Preferably, in the operation process of the H-bridge cascaded SVG, the single module locks up the physical characteristics of the phase-rectifying current. In the normal operation process of the H-bridge cascaded SVG, all the submodules carry out turn-on and turn-off of the IGBT and the diode according to a normal modulation method, and if single submodule fault locking occurs, the physical characteristic of the phase-locked current is expressed as diode charging current.
And after the uplink communication of the sub-module to the control protection device is abnormal, confirming the state of the black module in a trial unlocking mode. After the black module appears, the protection device is controlled to execute the black module bypass logic, a sub-module bypass command is issued, and the sub-module executes the bypass command after receiving the bypass command; however, whether the sub-module is successfully bypassed is not determined, and a novel redundancy mode pilot-test unlocking function needs to be adopted for verification.
Illustratively, the trial unlocking is performed by adopting small-current trial unlocking, and the small-current trial unlocking can be performed by adopting no more than 20% of rated current of the SVG device. If large-current trial unlocking is adopted and the black module is not bypassed successfully, the problem of module damage caused by too fast direct-current voltage charging of the module is easy to occur, and an RTDS (real time digital system) waveform diagram of the module damage caused by large-current trial unlocking failure is shown in fig. 5.
In the trial unlocking process, whether trial unlocking is successful is determined by judging the output current, and then whether the bypass of the black module is successful is determined; the SVG performs trial unlocking verification according to a certain current; and if the operation is normal within a certain time after unlocking and the diode charging current does not appear, the black module bypass is considered to be successful. The RTDS waveform after successful unlocking using a small current trial is shown in fig. 6. If the trial unlocking current is the diode charging current, the black module bypass is determined to be failed, and the RTDS waveform adopting the small current trial unlocking failure is shown in the attached figure 7.
In the embodiment of the invention, a novel H-bridge cascade SVG black module redundancy mode is formed by adopting a small-current trial unlocking function and a sub-module active bypass function, and no hardware equipment is added in the mode.
Based on the same invention concept, the invention also provides an H-bridge cascade SVG black module redundancy system, which comprises the following components:
the control protection module is used for sending a bypass instruction to the black module after the black module in the SVG device is confirmed to appear; the system is also used for judging whether the black module is successfully bypassed or not by adopting a current unlocking technology from the moment of sending the bypass instruction to the moment of reaching a first preset time length T1, and controlling the SVG device to be switched to normal operation if the bypass is successful; otherwise, the bypass fails, and the SVG device is controlled to trip;
and the black module is used for selecting a bypass execution mode according to whether a bypass command sent by the control protection device is received.
Preferably, the control protection module specifically includes:
the condition module is used for jumping to the instruction sending module after a black module appears in the SVG device;
the instruction sending module is used for sending a bypass instruction to the black module;
the execution module judges whether the black module is successfully bypassed or not by adopting a current unlocking technology from the moment of sending the bypass instruction to the moment of reaching a first preset time T1, and jumps to the operation control module if the bypass is successful; otherwise, jumping to a tripping control module if the bypass fails;
the operation control module is used for controlling the SVG device to be switched to normal operation;
and the tripping control module is used for controlling the tripping of the SVG device.
Preferably, the system further comprises:
the out-of-limit judging module is used for judging whether the number of bypass sub-modules in the phase of the black module is out of limit or not;
if the limit is not out of limit, jumping to the instruction sending module; otherwise, jumping to the tripping control module.
Preferably, the execution module is specifically configured to:
unlocking the SVG device according to a preset current from the moment of sending the bypass instruction to the moment of reaching a first preset time T1;
acquiring actual output current of the SVG device and diode charging current in the black module after unlocking;
if the actual output current of the SVG device is not equal to the charging current of the diode in the black module, the bypass of the black module is successful, and the operation control module is jumped to;
otherwise, the black module bypass fails and jumps to the trip control module.
Preferably, said preset current for unlocking the SVG device takes up no more than 20% of the rated current of the SVG device.
Preferably, the condition for judging the occurrence of the black module in the SVG device in the condition module includes:
and acquiring uplink communication signals of all sub-modules in the SVG device in real time, and if the uplink communication signals of at least one sub-module are not received within a second preset time period T2, considering that the at least one sub-module is a black module.
Preferably, the first preset time period T1 is not less than the preset time period T3 when the black module receives the bypass instruction, the preset time period T4 when the black module executes the bypass, and the preset time period T5 when the black module returns the bypass completion signal;
the T4 is the maximum of the two:
the black module executes the time length of the bypass according to the bypass instruction;
and the black module executes the duration of the active bypass according to a preset sequential logic.
Preferably, the black module is specifically configured to:
if the black module receives a bypass instruction sent by the control protection device after the delay time T3, the black module executes bypass according to the bypass instruction;
and if the black module does not receive the bypass instruction sent by the control protection device after the delay time T3, the black module executes active bypass according to a preset time sequence logic.
Example 3
The invention provides a novel H-bridge cascade SVG black module redundancy method, as shown in figure 9, in the redundancy method, when a black module appears, an SVG device quickly judges, quickly judges the bypass state of the black module in a trial unlocking mode, determines whether the SVG device trips or normally outputs according to the bypass state of the black module, and further reduces the tripping times of the SVG device. The mode of combining the active bypass of the sub-module and the small-current trial unlocking is the novel H-bridge black module redundancy method.
The redundancy method comprises the following steps:
step S31: judging whether the communication of the receiving submodule of the control protection device is abnormal or not; if so, determining the black module status and proceeding to step S32; otherwise, go to step S35;
preferably: and a redundancy mode of H-bridge cascade SVG is adopted.
In the operation process of the H-bridge cascaded SVG, the sub-modules have several operation states, and the operation states are shown in the technical figure 3. The operation process includes a charging state as shown in fig. 3a, in which only the diode is conducting, a discharging state as shown in fig. 3b, and a conducting freewheeling state as shown in fig. 3c, and at this time, the diode and the IGBT are conducting cooperatively.
Preferably: if the single module is locked in the operation process of the H-bridge cascaded SVG, the single module is in a charging state, so that the output current of the device is different from the normal operation. When the single sub-module is locked, the output current of the IGBT and the diode of the single module is as shown in figure 4, and the output current of the device is consistent with the current of the sub-module.
Step S32: judging whether the redundancy number exceeds the limit; if yes, defaulting to bypass the sub-module and success, and issuing a bypass command to the sub-module; otherwise, determining that the device trips;
step S33: determining whether the submodule receives the control protection device signal abnormity; if yes, the sub-module executes active bypass according to preset sequential logic; otherwise, the sub-module executes the bypass according to the received bypass instruction;
step S34: executing trial unlocking according to logic control and protection; judging whether the trial unlocking is successful; if so, determining that the bypass of the black module is successful, and switching to a normal operation state; otherwise, determining that the device trips;
preferably: after specific logic design, the protection device is controlled to unlock the SVG device according to small current, the SVG is unlocked and then judges whether the current is diode charging current according to actual current output, if the current is the charging current, the trial unlocking is judged to fail, the black module bypass fails, the tripping of the device is determined, and the device is withdrawn; if the current is not the diode charging current, the bypass of the black module is successful, and the device is converted into a normal operation state.
If the trial unlocking is successful, judging that the black module bypass is successful, outputting the device according to a normal instruction, and recovering the device to a normal operation state; if the unlocking trial fails, the bypass of the black module is judged to fail, and the device needs to be locked and tripped as soon as possible.
Based on the characteristics disclosed in fig. 4, by using the characteristics, it can be determined whether the sub-module locking exists in the phase by judging the current. In the phase, only the state control protection device of the black module cannot know the state, so if the locking submodule is determined to be the black module, the bypass failure of the black module is judged, and the process of determining whether the black module is successfully bypassed or not in the mode is defined as a bypass trial unlocking process. The magnitude of bypass trial unlocking current determines the charging speed of the black module when the bypass fails, so that the safety of the sub-module during trial unlocking is ensured by adopting a low-current down-trial unlocking mode. And if the uplink and downlink communication from the protection device to the submodule is abnormal, adopting a submodule active bypass adding and unlocking mode to realize submodule bypass. The sub-module active bypass means that when the downlink communication from the control protection device to the sub-module is abnormal, the sub-module automatically bypasses the sub-module according to a logic time sequence, and the control protection device bypasses the sub-module according to the logic.
Preferably: the trial unlocking adopts small-current trial unlocking, and the small-current trial unlocking adopts trial unlocking with the rated current not exceeding 20%. If large-current trial unlocking is adopted and the black module is not bypassed successfully, the problem of module damage caused by too fast direct-current voltage charging of the module is easy to occur, and an RTDS (real time digital system) oscillogram of the damaged module with large-current trial unlocking failure is shown in an attached figure 5.
In the trial unlocking process, whether trial unlocking is successful is determined by judging the output current, and further whether the bypass of the black module is successful is determined; the SVG performs trial unlocking verification according to a certain current; and if the operation is normal within a certain time after unlocking and the diode charging current does not appear, the black module bypass is considered to be successful. The RTDS waveform for the successful trial unlocking of the black module is shown in fig. 6. If the trial unlocking current is the diode charging current, the black module bypass is determined to fail, and the RTDS waveform of the trial unlocking failure is shown in fig. 7.
Step S35; finishing;
preferably: if the single module is locked in the operation process of the H-bridge cascaded SVG, the single module is in a charging state, so that the output current of the device is different from the normal operation. When the single sub-module is locked, the output current of the IGBT and the diode of the single module is as shown in figure 4, and the output current of the device is consistent with the current of the sub-module.
Preferably: and in the operation process of the H-bridge cascaded SVG, the physical characteristic of the phase-rectifying current is realized when a single module is locked. In the normal operation process of the H-bridge cascaded SVG, all the submodules carry out turn-on and turn-off of the IGBT and the diode according to a normal modulation method, and if single submodule fault locking occurs, the physical characteristic of the phase-locked current is expressed as diode charging current.
And after the uplink communication of the sub-module to the control protection device is abnormal, confirming the state of the black module in a trial unlocking mode. After the black module appears, the protection device is controlled to execute the black module bypass logic, a sub-module bypass command is issued, and the sub-module executes the bypass command after receiving the bypass command; however, whether the sub-module is successfully bypassed is not determined, and a novel redundancy mode pilot-test unlocking function needs to be adopted for verification.
By adopting a small-current trial unlocking and sub-module active bypass function, a novel H-bridge cascade SVG black module redundancy mode is formed; this approach does not add any hardware devices.
Preferably: after the appearance of a black module with abnormal uplink and downlink communication from the submodule to the control protection device, the bypass cannot be completed by simply adopting a trial unlocking mode, and the active bypass function of the submodule needs to be added. When the submodule receives the communication abnormality of the control protection device, the submodule is directly bypassed according to the logic design, and at the moment, the control protection device also bypasses the submodule according to the logic design; after the operation is executed, the device is unlocked according to the trial unlocking logic, whether the bypass of the module is successful is determined according to the trial unlocking result, and whether the device continues to operate is determined.
In a second aspect, the invention provides a novel redundant system of H-bridge cascaded SVG black modules, which comprises: the control protection device and the SVG device comprising the sub-modules;
the control protection device is used for judging whether the communication of the receiving submodule is abnormal or not; if yes, determining the black module state of the sub-module, and further judging whether the redundancy number exceeds the limit; and under the condition that the judgment result does not exceed the limit, defaulting to bypass the sub-module and success, and issuing a bypass command to the sub-module; otherwise, determining that the device trips;
preferably: and a redundancy mode of H-bridge cascade SVG is adopted.
The submodule is used for determining whether the signal of the control protection device is received abnormally; if yes, the sub-module executes active bypass according to sequential logic; otherwise, the sub-module executes the bypass according to the received bypass instruction; the system is also used for executing trial unlocking according to logic control and protection; judging whether the trial unlocking is successful; if so, determining that the bypass of the black module is successful, and switching to a normal operation state; otherwise, determining the tripping of the SVG device;
preferably: after specific logic design, the protection device is controlled to unlock the SVG device according to small current, the SVG is unlocked and then judges whether the current is diode charging current according to actual current output, if the current is the charging current, the trial unlocking is judged to fail, the black module bypass fails, the tripping of the device is determined, and the device is withdrawn; if the current is not the diode charging current, the bypass of the black module is successful, and the device is converted into a normal operation state.
Preferably: the trial unlocking adopts small-current trial unlocking, and the small-current trial unlocking adopts trial unlocking with the rated current not exceeding 20%. If large-current trial unlocking is adopted and the black module is not bypassed successfully, the problem of module damage caused by too fast direct-current voltage charging of the module is easy to occur, and an RTDS (real time digital system) waveform diagram of the module damage caused by large-current trial unlocking failure is shown in an attached figure 4.
If the trial unlocking is successful, judging that the black module bypass is successful, outputting the SVG device according to a normal instruction, and recovering the device to a normal operation state; if the unlocking trial fails, the bypass of the black module is judged to fail, and the SVG device needs to be locked and tripped as soon as possible.
And after the uplink communication of the sub-module to the control protection device is abnormal, confirming the state of the black module in a trial unlocking mode. After the black module appears, the protection device is controlled to execute the black module bypass logic, a sub-module bypass command is issued, and the sub-module executes the bypass command after receiving the bypass command; however, whether the sub-module is successfully bypassed is not determined, and a novel redundancy mode pilot-test unlocking function needs to be adopted for verification.
By adopting a small-current trial unlocking and sub-module active bypass function, a novel H-bridge cascade SVG black module redundancy mode is formed; this approach does not add any hardware devices.
Preferably: after the appearance of a black module with abnormal uplink and downlink communication from the submodule to the control protection device, the bypass cannot be completed by simply adopting a trial unlocking mode, and the active bypass function of the submodule needs to be added. When the submodule receives the communication abnormality of the control protection device, the submodule is directly bypassed according to the logic design, and at the moment, the control protection device also bypasses the submodule according to the logic design; after the operation is executed, the device is unlocked according to the trial unlocking logic, whether the bypass of the module is successful is determined according to the trial unlocking result, and whether the device continues to operate is determined.
Through this novel H bridge cascade SVG black module redundant mode, can reduce the SVG device because of the probability that single black module leads to the tripping operation, the operating stability of the device of improvement.
It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention which are filed as the application.
Claims (16)
1. A H-bridge cascaded SVG black module redundancy method is characterized by comprising the following steps:
when a black module appears in the SVG device, sending a bypass instruction to the black module;
judging whether the black module is successfully bypassed or not by adopting a current unlocking technology from the moment of sending the bypass instruction to the moment of reaching a first preset time length T1, and controlling the SVG device to be switched to normal operation if the bypass is successful; otherwise, the bypass fails, and the SVG device is controlled to trip.
2. The method of claim 1, wherein after the presence of a blackout module in the SVG device and before sending a bypass instruction to the blackout module, further comprising:
judging whether the number of bypass sub-modules in the phase of the black module is out of limit;
if the limit is not out of limit, sending a bypass instruction to the black module; otherwise, controlling the SVG device to trip.
3. The method of claim 1 or 2, wherein the determining whether the black module bypass is successful using a current unlocking technique comprises:
unlocking the SVG device according to a preset current;
acquiring actual output current of the SVG device and diode charging current in the black module after unlocking;
if the actual output current of the SVG device is not equal to the diode charging current in the black module, the black module bypass is successful; otherwise, the black module bypass fails.
4. The method of claim 3, wherein the preset current to unlock the SVG device takes no more than 20% of the rated current of the SVG device.
5. The method according to claim 1 or 2, wherein the judgment condition for the presence of a black module in the SVG device includes:
and acquiring uplink communication signals of all sub-modules in the SVG device in real time, and if the uplink communication signals of at least one sub-module are not received within a second preset time period T2, considering that the at least one sub-module is a black module.
6. The method of claim 1 or 2, wherein the first preset duration T1 is not less than the preset duration T3 for the black module to receive the bypass command + the preset duration T4 for the black module to perform the bypass + the preset duration T5 for waiting for the black module to return the bypass complete signal;
the T4 is the maximum of the two:
the black module executes the time length of the bypass according to the bypass instruction;
and the black module executes the duration of the active bypass according to a preset sequential logic.
7. A control and protection device, the device comprising:
the condition module is used for jumping to the instruction sending module after a black module appears in the SVG device;
the instruction sending module is used for sending a bypass instruction to the black module;
the execution module judges whether the black module is successfully bypassed or not by adopting a current unlocking technology from the moment of sending the bypass instruction to the moment of reaching a first preset time T1, and jumps to the operation control module if the bypass is successful; otherwise, jumping to a tripping control module if the bypass fails;
the operation control module is used for controlling the SVG device to be switched to normal operation;
and the tripping control module is used for controlling the tripping of the SVG device.
8. The control and protection device of claim 7, wherein said device further comprises:
the out-of-limit judging module is used for judging whether the number of bypass sub-modules in the phase of the black module is out of limit or not;
if the limit is not out of limit, jumping to the instruction sending module; otherwise, jumping to the tripping control module.
9. The control protection device according to claim 7 or 8, wherein the execution module is specifically configured to:
unlocking the SVG device according to a preset current from the moment of sending the bypass instruction to the moment of reaching a first preset time T1;
acquiring actual output current of the SVG device and diode charging current in the black module after unlocking;
if the actual output current of the SVG device is not equal to the charging current of the diode in the black module, the bypass of the black module is successful, and the operation control module is jumped to;
otherwise, the black module bypass fails and jumps to the trip control module.
10. The control and protection device of claim 9, wherein said preset current to unlock the SVG device takes no more than 20% of the rated current of the SVG device.
11. The control and protection device according to claim 7 or 8, wherein the judgment condition for the presence of the black module in the SVG device in the condition module includes:
and acquiring uplink communication signals of all sub-modules in the SVG device in real time, and if the uplink communication signals of at least one sub-module are not received within a second preset time period T2, considering that the at least one sub-module is a black module.
12. The control protection device according to claim 7 or 8, wherein the first preset duration T1 is not less than the preset duration T3 for the black module to receive the bypass command + the preset duration T4 for the black module to perform the bypass + the preset duration T5 for waiting for the black module to return the bypass complete signal;
the T4 is the maximum of the two:
the black module executes the time length of the bypass according to the bypass instruction;
and the black module executes the duration of the active bypass according to a preset sequential logic.
13. A H-bridge cascaded SVG black module redundancy method is characterized by comprising the following steps:
when the control protection device confirms that the black module appears in the SVG device, the control protection device sends a bypass instruction to the black module;
the black module selects a bypass execution mode according to whether a bypass command sent by the control protection device is received or not;
the control protection device judges whether the black module is successfully bypassed or not by adopting a current unlocking technology from the moment of sending the bypass instruction to the moment of reaching a first preset time length T1, and if the bypass is successful, the SVG device is controlled to be switched to normal operation; otherwise, the bypass fails, and the SVG device is controlled to trip.
14. The method of claim 13, wherein the black module selects a bypass mode according to whether a bypass command sent by the control protection device is received, and the bypass mode comprises the following steps:
if the black module receives a bypass instruction sent by the control protection device after the delay time T3, the black module executes bypass according to the bypass instruction;
if the black module does not receive the bypass instruction sent by the control protection device after the delay time T3, the black module executes active bypass according to a preset time sequence logic;
the T3 is a preset time duration T3 when the black module receives the bypass instruction.
15. The utility model provides a redundant system of cascaded SVG black module of H bridge which characterized in that includes:
control protection means for performing the method according to any one of claims 1 to 6;
and the black module is used for selecting a bypass execution mode according to whether a bypass command sent by the control protection device is received.
16. The method of claim 15, wherein the black module is specifically configured to:
if the black module receives a bypass instruction sent by the control protection device after the delay time T3, the black module executes bypass according to the bypass instruction;
and if the black module does not receive the bypass instruction sent by the control protection device after the delay time T3, the black module executes active bypass according to a preset time sequence logic.
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| CN115912652A (en) * | 2022-12-01 | 2023-04-04 | 中国南方电网有限责任公司超高压输电公司广州局 | Power module protection method and device, computer equipment and storage medium |
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| CN115912652A (en) * | 2022-12-01 | 2023-04-04 | 中国南方电网有限责任公司超高压输电公司广州局 | Power module protection method and device, computer equipment and storage medium |
| CN115912652B (en) * | 2022-12-01 | 2024-04-02 | 中国南方电网有限责任公司超高压输电公司广州局 | Power module protection method, device, computer equipment and storage medium |
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