CN116683402A - Method and structure for rapidly cutting excitation transformation fault of self-shunt excitation generator - Google Patents
Method and structure for rapidly cutting excitation transformation fault of self-shunt excitation generator Download PDFInfo
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- 230000005284 excitation Effects 0.000 title claims abstract description 157
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- 230000002159 abnormal effect Effects 0.000 claims description 12
- 238000004590 computer program Methods 0.000 claims description 9
- 238000012423 maintenance Methods 0.000 claims description 9
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Classifications
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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
- H02H7/06—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 dynamo-electric generators; for synchronous capacitors
-
- 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
- H02H7/06—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 dynamo-electric generators; for synchronous capacitors
- H02H7/065—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 dynamo-electric generators; for synchronous capacitors against excitation faults
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2101/00—Special adaptation of control arrangements for generators
- H02P2101/10—Special adaptation of control arrangements for generators for water-driven turbines
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- Control Of Eletrric Generators (AREA)
Abstract
The application discloses a method and a structure for rapidly cutting off excitation transformation faults of a self-shunt excitation generator, wherein the method comprises the following steps: the generator protection system starts to act; judging the type of the protection action; detecting the running state of an automatic control loop of the circuit breaker S; and executing the opening breaker S instruction. The structure comprises: the system comprises a circuit breaker S, a circuit breaker S control system, a generator protection system device, a monitoring system and an excitation system; according to the method and the structure for rapidly cutting off the excitation transformer faults of the self-shunt excitation generator, the method for rapidly cutting off the generator from the fault transformer when the excitation transformer has internal faults is realized through a generator protection system or a sequential control flow, and situation expansion is avoided; when the generator or the excitation transformer is overhauled, the application realizes the excitation transformer high-voltage side disconnection and connection work by manually opening or closing the newly-added breaker S remotely, thereby greatly improving the working efficiency and saving the time.
Description
Technical Field
The application belongs to the technical field of power systems, and particularly relates to a method and a structure for rapidly cutting off excitation transformation faults of a self-shunt excitation generator.
Background
The excitation system of the large-sized hydroelectric generating set is generally a self-shunt excitation system, excitation power is taken from a static alternating-current voltage source, and the excitation power is rectified by a static converter and then is input into a generator rotor excitation winding through a slip ring and an electric brush. The AC power supply is generally taken from the generator end, is connected to the rectifier after the excitation is changed to voltage, is generally provided with an AC breaker S between the rectifier input end and the excitation low-voltage side, is provided with a DC breaker S at the rectifier output end, and is used for cutting off excitation current when the excitation system exits or fails by using an AC-DC two-switch and called an excitation system magnetic-eliminating switch. When the generator or the excitation transformer is overhauled, the lead between the excitation transformer high-voltage side and the generator is required to be manually disconnected, the lead between the excitation transformer high-voltage side and the generator is restored after the overhauling is finished, the lead between the excitation transformer and the generator is made to be detachable by bolts, and the current structure and the disconnected lead mode have the following problems:
when the excitation transformer has internal faults, even if the excitation transformer group protection and the excitation de-excitation system are both operated correctly, the de-excitation switch is normally tripped, the rotor is isolated from the fault transformer, but the excitation transformer is not completely isolated from the stator of the generator, and the generator is possibly damaged under the condition that energy is not consumed in time, so that the situation is enlarged;
the excitation transformer breaking and connecting operation involves the cover opening and the bolt dismounting, on one hand, the operation is complex, the frequent dismounting may cause the phenomena of the infirm of the lead fixing bolt, the ageing of the lead welding port, the fuzzing and falling, the reduction of the lead insulation, etc., thereby the transformer accident caused by the lead fault is caused, on the other hand, if the breaking and connecting operation is not strictly implemented according to the standard operation flow, the oxidation of the internal outlet lead and the excitation transformer coil of the generator may be caused, and the hidden trouble is buried in advance for the accident.
Disclosure of Invention
This section is intended to outline some aspects of embodiments of the application and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description of the application and in the title of the application, which may not be used to limit the scope of the application.
The present application has been made in view of the above-described problems. Therefore, the technical problems solved by the application are as follows: when the excitation transformer has internal faults, even if the excitation transformer group protection and excitation de-excitation system acts correctly, the excitation transformer is completely isolated from the stator of the generator, so that the problems of damage and situation expansion of the generator possibly caused are avoided; in the processes of breaking and connecting the lead, the phenomena of unstable lead fixing bolts, ageing of lead welding ports, fuzzing and falling, reduced insulation of the lead and the like are avoided, the implementation according to a standard operation flow is ensured, and the problems of faults of an internal outlet lead and an excitation variable coil of the generator caused by oxidation are avoided
In order to solve the technical problems, the application provides the following technical scheme: a method for rapidly cutting off excitation variation faults of a self-shunt excitation generator comprises the following steps,
the generator protection system starts to act;
judging the type of the protection action;
detecting the running state of an automatic control loop of the circuit breaker S;
and executing the breaker S instruction for opening the gate.
As a preferable scheme of the method for rapidly cutting off excitation variation faults of the self-shunt excitation generator, the method comprises the following steps: the judging process for judging the protection action type comprises the following steps:
after receiving a tripping signal of a generator protection system, the control system judges whether the protection action type is excitation variable protection or not;
when the protection action type is judged to be the excitation variable protection, the linkage instruction is not executed so as to prevent misoperation from causing other equipment to stop, and when the protection action type is judged to be the excitation variable protection, whether an automatic control loop of the circuit breaker S is normal is further judged;
before executing the linkage instruction of the circuit breaker S, the excitation transformer alternating current magnetic extinction switch needs to be turned on to ensure that the excitation transformer stops working.
As a preferable scheme of the method for rapidly cutting off excitation variation faults of the self-shunt excitation generator, the method comprises the following steps: the step of detecting the running state of the automatic control loop of the breaker S comprises the following steps:
when the automatic control loop of the breaker S is abnormal, judging which parts of the automatic control loop of the breaker S have faults, when judging that the power supply has faults, outputting alarm signals of the abnormal power supply of the automatic control loop of the breaker S, when judging that the signal line has faults, outputting alarm signals of the signal line faults of the automatic control loop of the breaker S, informing maintenance personnel to repair, and before repair is completed, enabling a control system not to execute linkage instructions of the breaker S so as to prevent other equipment from being stopped due to misoperation;
when the automatic control loop of the breaker S is normal, the control system executes a PLC opening and breaking breaker S instruction, and the instruction triggers breaking operation of the breaker S so that excitation becomes completely isolated from other equipment;
the judging rule of the normal of the automatic control loop is that when the power supply, signal transmission, control system, excitation transformer, generator protection system and power system load of the automatic control loop of the circuit breaker S are all normal, the circuit breaker S is in a closing state and can normally respond to a PLC opening and closing instruction, the automatic control loop of the circuit breaker S is judged to be normal.
As a preferable scheme of the method for rapidly cutting off excitation variation faults of the self-shunt excitation generator, the method comprises the following steps: when the control system executes the opening breaker S instruction, the control system monitors the state of the breaker S at the same time, ensures that the breaker S is in a closing state and then executes opening operation, when the breaker S is in the opening state, the control system immediately outputs an alarm signal that the breaker S is opened, and stops executing the opening instruction, and when the breaker S is in the closing state, the control system executes the opening operation and completes the opening instruction.
As a preferable scheme of the method for rapidly cutting off excitation variation faults of the self-shunt excitation generator, the method comprises the following steps: after the breaker S executes the opening command, the control system needs to check whether the breaker S successfully opens:
when the breaker S is successfully disconnected, the control system can immediately output a signal that the generator protection system is linked with the tripping breaker S to be successful, so that the fault of excitation change of the self-shunt excitation generator is successfully removed, the control system can further detect whether the system is recovered to be normal or not, and if other abnormal conditions are found, the system can timely take corresponding measures to process;
the judging rule of the successful breaking is that after the breaker S is opened, excitation becomes completely isolated from other equipment, and when the control system can normally monitor a signal that the generator protection system is successful in linkage with the breaker S, breaking operation is considered to be successfully executed;
when the breaking of the circuit breaker S fails, the control system checks the state of the circuit breaker S and whether the control loop is normal, and tries to re-perform the breaking operation. If the multiple attempts are unsuccessful, the control system immediately outputs an alarm signal of failure of opening the breaker S, stops executing the opening command and informs maintenance personnel to process.
When the breaker S fails to break, the control system detects other abnormal conditions, finds out faults of other equipment or sudden increase of load of the power system, and the control system takes corresponding measures to process so as to ensure safe and stable operation of the power system.
The abnormality and corresponding measures include that when the excitation transformer is found to have a fault, the control system is immediately switched to the standby excitation transformer; when the load of the power system suddenly increases, the control system should adjust the load distribution in time, and balance the load of the power system by reducing the load of some devices or increasing the load of some devices so as to avoid overload operation of the power system.
As a preferable scheme of the method for rapidly cutting off excitation variation faults of the self-shunt excitation generator, the method comprises the following steps: and when the excitation becomes serious faults exist inside, the breaker S is manually controlled to break the gate to rapidly cut off the faults, and standby equipment is started to maintain the operation of the power system.
As a preferable scheme of the structure for rapidly cutting off excitation variation faults of the self-shunt excitation generator, the application comprises the following steps:
a circuit breaker S for breaking the circuit;
the circuit breaker S control system is used for remotely and locally switching the circuit breaker S and can receive a switching-on and switching-off instruction of the monitoring system and a switching-off instruction of the generator protection system;
the generator protection system device is used for realizing the protection configuration of the hydroelectric generating set and the excitation transformer;
the monitoring system is used for controlling the electric energy production process of the hydropower station by utilizing a digital electronic computer;
and the excitation system is used for providing a working magnetic field for the generator.
As a preferable scheme of the structure for rapidly cutting off excitation variation faults of the self-shunt excitation generator, the application comprises the following steps: the circuit breaker S further includes: the circuit breaker S is a three-phase circuit breaker S, and excitation high-voltage side leads are connected with two sides of the three-phase circuit breaker S which is newly added at the outlet side of the generator through bolts.
A computer device, comprising: a memory and a processor; the memory stores a computer program characterized in that: the processor, when executing the computer program, implements the steps of the method of any of the present application.
A computer-readable storage medium having stored thereon a computer program, characterized by: which when executed by a processor, carries out the steps of the method described in the application.
The application has the beneficial effects that: according to the method and the structure for rapidly cutting off the excitation transformer faults of the self-shunt excitation generator, the method for rapidly cutting off the generator from the fault transformer when the excitation transformer has internal faults is realized through the generator protection system or the sequential control flow, and situation expansion is avoided; when the generator or the excitation transformer is overhauled, the application realizes the excitation transformer high-voltage side disconnection and connection work by manually opening or closing the newly-added breaker S remotely, thereby greatly improving the working efficiency and saving the time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
fig. 1 is a schematic flow chart of a method for rapidly cutting off excitation failure of a self-shunt excitation generator.
FIG. 2 is an interactive schematic diagram of a method for rapidly cutting off excitation failure of a self-shunt excitation generator.
Fig. 3 is a schematic structural diagram of a fast cut-off self-shunt excitation generator excitation transformer fault structure provided by the present application.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present application can be understood in detail, a more particular description of the application, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present application is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the application. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
While the embodiments of the present application have been illustrated and described in detail in the drawings, the cross-sectional view of the device structure is not to scale in the general sense for ease of illustration, and the drawings are merely exemplary and should not be construed as limiting the scope of the application. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.
Also in the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "upper, lower, inner and outer", etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first, second, or third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The terms "mounted, connected, and coupled" should be construed broadly in this disclosure unless otherwise specifically indicated and defined, such as: can be fixed connection, detachable connection or integral connection; it may also be a mechanical connection, an electrical connection, or a direct connection, or may be indirectly connected through an intermediate medium, or may be a communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
Example 1
Referring to fig. 1, for one embodiment of the present application, a method for rapidly cutting off excitation failure of a self-shunt excitation generator is provided, comprising:
s1: the generator protection system starts to act;
furthermore, when the generator protection system starts to operate, the control system can determine whether to execute the linkage instruction of the breaker S according to the protection operation type. If the protection action type is excitation variable protection, it is necessary to further judge whether the automatic control loop of the breaker S is normal.
It should be noted that, during the operation of the self-shunt excitation generator, if the excitation becomes faulty, the generator protection system will act, and the protection device will send a trip signal to the control system, triggering the linkage flow.
S2: judging the type of the protection action;
further, after the control system receives the tripping signal of the generator protection system, it needs to judge whether the protection action type is excitation variable protection;
furthermore, when the protection action type is judged to be not excitation variable protection, the linkage instruction is not executed so as to avoid the shutdown of other equipment caused by misoperation, and when the protection action type is judged to be excitation variable protection, whether the automatic control loop of the circuit breaker S is normal is further judged.
S3: detecting the running state of an automatic control loop of the circuit breaker S;
further, when the automatic control loop of the breaker S is abnormal, judging which parts of the automatic control loop of the breaker S have faults, when judging that the power supply has faults, outputting an alarm signal of 'the power supply of the automatic control loop of the breaker S is abnormal', when judging that the signal line has faults, outputting an alarm signal of 'the signal line of the automatic control loop of the breaker S is fault', informing maintenance personnel to repair, and before repair is completed, enabling a control system not to execute linkage instructions of the breaker S so as to avoid stopping other equipment caused by misoperation;
when the automatic control loop of the breaker S is normal, the control system executes a PLC opening and breaking breaker S command, and the command triggers breaking operation of the breaker S, so that excitation becomes completely isolated from other equipment.
Furthermore, the normal judgment rule of the automatic control loop is that when the power supply, signal transmission, control system, excitation transformer, generator protection system and power system load of the automatic control loop of the circuit breaker S are normal, and the circuit breaker S is in a closing state and can normally respond to a PLC opening and closing instruction, the automatic control loop of the circuit breaker S is judged to be normal.
Furthermore, when the PLC is executed to open and close the breaker S, the control system monitors the state of the breaker S at the same time, so that the breaker S is ensured to be in a closing state to execute the opening operation. If the breaker S is in the opening state, the control system will immediately output an alarm signal of "the breaker S has been opened" and stop executing the opening command.
It should be noted that, before executing the linkage instruction of the circuit breaker S, the exciting-variable ac magnetic extinction switch needs to be turned on to ensure that the exciting-variable has stopped working.
It should be noted that the instruction will trigger the opening operation of the circuit breaker S, so that the excitation becomes completely isolated from other devices, and the safe operation of the power system is ensured.
S4: and monitoring whether the breaker S is successfully opened.
Further, before the opening operation of the circuit breaker S is performed, it is necessary to check whether the circuit breaker S itself is normal. If the breaker S itself is found to be faulty, maintenance or replacement is required first to avoid causing other problems when executing the linkage instruction.
Further, after the control system executes the operation of the PLC to open the opening breaker S, the control system needs to check whether the opening of the breaker S is successful.
Furthermore, when the breaker S is successfully disconnected, the control system immediately outputs a signal of 'the generator protection system is linked to jump the breaker S successfully', which means that the fault of the excitation change of the self-shunt excitation generator is successfully cut off, the control system further detects whether the system is recovered to be normal or not, and if other abnormal conditions are found, the system can timely take corresponding measures to process;
further, the judgment rule of successful brake separation is as follows: when the breaker S is opened, excitation becomes completely isolated from other equipment, and the control system can normally monitor a signal that the generator protection system is linked and the breaker S is successful, the breaking operation can be considered to be successfully executed.
When the breaking of the circuit breaker S fails, the control system checks the state of the circuit breaker S and whether the control loop is normal, and tries to re-perform the breaking operation. If the multiple attempts are unsuccessful, the control system immediately outputs an alarm signal of failure of opening the breaker S, stops executing the opening command and informs maintenance personnel to process.
When the breaker S fails to break, the control system detects other abnormal conditions, finds out faults of other equipment or sudden increase of load of the power system, and the control system takes corresponding measures to process so as to ensure safe and stable operation of the power system.
Other anomalies and corresponding measures include, for example, when a fault is found in the excitation variation, the control system should immediately switch to the alternate excitation variation; when the load of the power system suddenly increases, the control system should adjust the load distribution in time, and balance the load of the power system by reducing the load of some devices or increasing the load of some devices so as to avoid overload operation of the power system.
It should be noted that, if the breaker S is found to be unable to be opened or fails to be opened when the linkage instruction of the breaker S is executed, possible reasons include: the breaker S itself is faulty, the control loop is faulty, the PLC control instruction is wrong, etc.
It should be noted that, in order to ensure the safe operation of the system, it is necessary to perform periodic maintenance, test and verification of the control system of the circuit breaker S. In the test and verification process, various fault conditions need to be simulated to ensure that the coordinated control system of the circuit breaker S can work normally.
It should be noted that the circuit breaker S should perform the opening operation only if necessary. Frequent opening of the gate can exacerbate wear and degradation of the equipment, as well as reduce the reliability and stability of the system. Therefore, under normal conditions, the circuit breaker S should remain in a closed state. In designing the coordinated control system of the circuit breaker S, it is necessary to consider different fault types and emergency situations. For example, if a critical fault is found inside the excitation transformer, the fault can be quickly removed by manually controlling the breaker S to open, and enabling the backup equipment to maintain operation of the power system.
In summary, the field-switching failure of self-shunt generators is a common power system problem that requires effective measures to ensure safe, reliable, stable operation of the system. By performing the above four steps and precautions, the self-shunt generator excitation fault can be quickly removed, thereby avoiding the loss and impact caused thereby to the greatest extent.
The present embodiment also provides a computing device comprising, a memory and a processor; the memory is used for storing computer executable instructions, and the processor is used for executing the computer executable instructions to realize the method for quickly cutting off the excitation variation faults of the self-shunt excitation generator according to the embodiment.
The present embodiment also provides a storage medium having stored thereon a computer program which, when executed by a processor, implements a method of rapidly removing excitation failure of a self-shunt excitation generator as proposed by the above embodiments.
The storage medium proposed in this embodiment belongs to the same inventive concept as the method for quickly removing the excitation transformer fault of the self-shunt excitation generator proposed in the above embodiment, and technical details not described in detail in this embodiment can be seen in the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile memory may include read only memory, magnetic tape, floppy disk, flash memory, optical memory, high density embedded nonvolatile memory, resistive memory, magnetic memory, ferroelectric memory, phase change memory, graphene memory, and the like. Volatile memory can include random access memory, external cache memory, or the like. By way of illustration, and not limitation, RAM can take many forms, such as static random access memory or dynamic random access memory. The databases referred to in the embodiments provided herein may include at least one of a relational database and a non-relational database. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processor referred to in the embodiments provided in the present application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, or the like, but is not limited thereto.
Example 2
Referring to fig. 2, for one embodiment of the present application, a quick cut-off self-shunt generator excitation fault structure is provided, comprising:
breaker S (1): for cutting off the circuit;
breaker S control system (2): the system is used for remote and on-site switching-on/off circuit breakers S, and can receive switching-on/off instructions of a monitoring system and switching-off instructions of a generator protection system.
Generator protection system device (3): the microcomputer protection device for the configuration of the hydroelectric generating set can realize the protection configuration of the hydroelectric generating set and the excitation transformer.
Monitoring system (4): the digital electronic computer is used for controlling the electric energy production process of the hydropower station, and the electronic computer is used for replacing the controller and the control method in the traditional automatic control.
Excitation system (5): excitation is a device that supplies a stator power to a generator or a synchronous motor stator, and supplies an operating magnetic field to a generator or the like.
Furthermore, the circuit breaker S is a three-phase circuit breaker S, and the excitation high-voltage side lead wire is connected with two sides of the newly added three-phase circuit breaker S at the outlet side of the generator through bolts;
further, when a fault occurs, the circuit breaker S control system can rapidly open and close the circuit breaker S, thereby breaking the circuit and protecting the equipment from damage. Meanwhile, the system can also receive instructions of the monitoring system so as to realize more accurate control.
Furthermore, the generator protection system device is another very important component, and the device is a microcomputer protection device, so that the electric parameters between the hydroelectric generating set and the excitation transformer can be monitored in real time, and corresponding protection measures can be immediately taken when faults occur. For example, when the outlet current of the generator exceeds the rated value, the protection device can be automatically switched off to cut off the circuit, so that overload faults are avoided.
Furthermore, the monitoring system is a brain of the whole structure, the system utilizes a digital electronic computer to control the electric energy production process of the hydropower station, monitors various key parameters such as current, voltage, power and the like in real time, automatically adjusts the output voltage and current of the excitation transformer of the generator according to a preset parameter range, and ensures the stability and safety of electric energy production.
Furthermore, the excitation system is a device for providing a working magnetic field for the generator and is the most basic part in the whole structure, and the excitation system adopts an advanced power technology, so that the size and the direction of the magnetic field can be accurately controlled, and the normal operation of the generator is ensured.
The structure for rapidly cutting off the excitation transformer faults of the self-shunt excitation generator not only has high-efficiency and rapid fault cutting-off capability, but also can improve the stability and reliability of electric energy production, and greatly reduces the fault risk and maintenance cost.
In order to verify the beneficial effects of the application, the linkage protection function of the control system during the excitation failure of the self-shunt excitation generator is verified, and scientific demonstration is carried out through a simulation experiment.
The experimental steps are as follows:
setting simulation environment and parameters;
rated power of the generator: 1000kW
Idle rotation speed: 1500rpm
Exciting current: 10A
Circuit breaker S rated voltage: 380V
Breaker S rated current: 630A
Switching-on and switching-off time of the breaker S: 30ms
Performing an experiment;
in the running process of the generator, the simulated excitation becomes faulty, the generator protection system device is triggered to trip, and a tripping signal is sent to the control system. After receiving the tripping signal, the control system judges whether the protection action type is excitation variable protection or not. Since this fault is a simulated field-change fault, the control system will execute the linkage instructions of the circuit breaker S and verify whether the operation is successful by checking whether the circuit breaker S is successfully opened. If the switching-off is successful, outputting a signal of 'successful linkage tripping of the generator protection system and the breaker S'; if the breaking fails, an alarm signal of 'breaker S breaking failure' is output.
Collecting experimental data;
trip time: 0.5 second
Breaker S break time: 30ms
Probability of successful opening of the circuit breaker S: 98 percent of
Probability of failure of opening of the circuit breaker S: 2%
Experiments prove that the method for rapidly isolating the generator from the fault transformer when the excitation transformer has internal faults is realized through the generator protection system or the sequential control flow, so that the situation expansion is avoided, the excitation transformer faults of the self-shunt excitation generator are rapidly removed, and the loss and the influence caused by the excitation transformer faults are avoided to the greatest extent.
It should be noted that the above embodiments are only for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present application may be modified or substituted without departing from the spirit and scope of the technical solution of the present application, which is intended to be covered in the scope of the claims of the present application.
Claims (10)
1. A method for rapidly removing excitation failure of a self-shunt excitation generator, comprising:
the generator protection system starts to act;
judging the type of the protection action;
detecting the running state of an automatic control loop of the circuit breaker S;
and executing the breaker S instruction for opening the gate.
2. The method for rapidly removing excitation failure of self-shunt excitation generator according to claim 1, wherein: the judging process for judging the protection action type comprises the following steps:
after receiving a tripping signal of a generator protection system, the control system judges whether the protection action type is excitation variable protection or not;
when the protection action type is judged to be the excitation variable protection, the linkage instruction is not executed so as to prevent misoperation from causing other equipment to stop, and when the protection action type is judged to be the excitation variable protection, whether an automatic control loop of the circuit breaker S is normal is further judged;
before executing the linkage instruction of the circuit breaker S, the excitation transformer alternating current magnetic extinction switch needs to be turned on to ensure that the excitation transformer stops working.
3. The method for rapidly removing excitation failure of self-shunt excitation generator according to claim 2, wherein: the step of detecting the running state of the automatic control loop of the breaker S comprises the following steps:
when the automatic control loop of the breaker S is abnormal, judging which parts of the automatic control loop of the breaker S have faults, when judging that the power supply has faults, outputting alarm signals of the abnormal power supply of the automatic control loop of the breaker S, when judging that the signal line has faults, outputting alarm signals of the signal line faults of the automatic control loop of the breaker S, informing maintenance personnel to repair, and before repair is completed, enabling a control system not to execute linkage instructions of the breaker S so as to prevent other equipment from being stopped due to misoperation;
when the automatic control loop of the breaker S is normal, the control system executes a PLC opening and breaking breaker S instruction, and the instruction triggers breaking operation of the breaker S so that excitation becomes completely isolated from other equipment;
the judging rule of the normal of the automatic control loop is that when the power supply, signal transmission, control system, excitation transformer, generator protection system and power system load of the automatic control loop of the circuit breaker S are all normal, the circuit breaker S is in a closing state and can normally respond to a PLC opening and closing instruction, the automatic control loop of the circuit breaker S is judged to be normal.
4. The method for rapidly removing excitation failure of self-shunt excitation generator according to claim 3, wherein: when the control system executes the opening breaker S instruction, the control system can monitor the state of the breaker S at the same time to ensure that the breaker S is in a closing state to execute opening operation,
when the breaker S is in a breaking state, the control system immediately outputs an alarm signal that the breaker S is broken, and stops executing breaking instructions;
and when the breaker S is in a closing state, executing a brake separating operation to complete a brake separating instruction.
5. The method for rapidly removing excitation failure of self-shunt excitation generator according to claim 4, wherein: after the breaker S executes the opening command, the control system needs to check whether the breaker S successfully opens:
when the breaker S is successfully disconnected, the control system can immediately output a signal that the generator protection system is linked with the tripping breaker S to be successful, so that the fault of excitation change of the self-shunt excitation generator is successfully removed, the control system can further detect whether the system is recovered to be normal or not, and if other abnormal conditions are found, the system can timely take corresponding measures to process;
the judging rule of the successful breaking is that after the breaker S is opened, excitation becomes completely isolated from other equipment, and when the control system can normally monitor a signal that the generator protection system is successful in linkage with the breaker S, breaking operation is considered to be successfully executed;
when the breaker S fails to break, the control system checks the state of the breaker S and whether a control loop is normal or not, and tries to re-execute breaking operation; if the multiple attempts are unsuccessful, the control system immediately outputs an alarm signal of failure of opening the switch of the breaker S, stops executing the switch-off instruction and informs maintenance personnel to process the switch-off instruction;
when the breaker S fails to break, the control system detects other abnormal conditions, finds out faults of other equipment or sudden increase of load of the power system, and the control system takes corresponding measures to process so as to ensure safe and stable operation of the power system;
the abnormality and corresponding measures include that when the excitation transformer is found to have a fault, the control system is immediately switched to the standby excitation transformer; when the load of the power system suddenly increases, the control system should adjust the load distribution in time, and balance the load of the power system by reducing the load of some devices or increasing the load of some devices so as to avoid overload operation of the power system.
6. The method for rapidly removing excitation failure of self-shunt excitation generator according to claim 1, wherein: and when the excitation becomes serious faults exist inside, the breaker S is manually controlled to break the gate to rapidly cut off the faults, and standby equipment is started to maintain the operation of the power system.
7. A structure for rapidly removing excitation failure of a self-shunt excitation generator, comprising:
a circuit breaker S for breaking the circuit;
the circuit breaker S control system is used for remotely and locally switching the circuit breaker S and can receive a switching-on and switching-off instruction of the monitoring system and a switching-off instruction of the generator protection system;
the generator protection system device is used for realizing the protection configuration of the hydroelectric generating set and the excitation transformer;
the monitoring system is used for controlling the electric energy production process of the hydropower station by utilizing a digital electronic computer;
and the excitation system is used for providing a working magnetic field for the generator.
8. The structure for rapidly removing excitation failure of self-shunt excitation generator according to claim 7, wherein: the circuit breaker S is a three-phase circuit breaker S, and excitation high-voltage side leads are connected with two sides of the three-phase circuit breaker S which is newly added at the outlet side of the generator through bolts.
9. A computer device, comprising: a memory and a processor; the memory stores a computer program characterized in that: the processor, when executing the computer program, implements the steps of the method of any one of claims 1 to 6.
10. A computer-readable storage medium having stored thereon a computer program, characterized by: the computer program implementing the steps of the method of any of claims 1 to 6 when executed by a processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310603060.1A CN116683402A (en) | 2023-05-26 | 2023-05-26 | Method and structure for rapidly cutting excitation transformation fault of self-shunt excitation generator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310603060.1A CN116683402A (en) | 2023-05-26 | 2023-05-26 | Method and structure for rapidly cutting excitation transformation fault of self-shunt excitation generator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117969449A (en) * | 2024-03-29 | 2024-05-03 | 三峡金沙江云川水电开发有限公司 | Method and system for detecting insulation defect of stator bar of generator by terahertz |
-
2023
- 2023-05-26 CN CN202310603060.1A patent/CN116683402A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117969449A (en) * | 2024-03-29 | 2024-05-03 | 三峡金沙江云川水电开发有限公司 | Method and system for detecting insulation defect of stator bar of generator by terahertz |
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