CN112653092A - Generator exit protection method and terminal equipment - Google Patents
Generator exit protection method and terminal equipment Download PDFInfo
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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
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Abstract
The invention is suitable for the technical field of generators, and discloses a generator exit protection method and terminal equipment, wherein a generator supplies power to a load through a converter, and the method comprises the following steps: acquiring output parameters of the generator; judging whether the generator is about to exit or not according to the output parameters; and if the generator is judged to be about to exit, sending a control signal to the converter, wherein the control signal is used for indicating the converter to carry out protection shutdown. The invention can prevent the load from breaking down caused by the oscillation phenomenon when the generator exits, and can protect the load.
Description
Technical Field
The invention belongs to the technical field of generators, and particularly relates to a generator exit protection method and terminal equipment.
Background
The generator is mechanical equipment for converting energy in other forms into electric energy, and has wide application in industrial and agricultural production, national defense, science and technology and daily life.
The generator can supply power to the load when in normal operation. However, when the generator is withdrawn, the output current of the generator is increased, and the oscillation phenomenon is likely to occur, whereas the generator is withdrawn for a long time and is in an oscillation state for a long time, which is likely to cause a load failure.
Disclosure of Invention
In view of this, embodiments of the present invention provide a generator exit protection method and a terminal device, so as to solve the problem in the prior art that a load is likely to fail when a generator exits.
A first aspect of an embodiment of the present invention provides a method for protecting a generator from exiting, where the generator supplies power to a load through a converter, and the method for protecting the generator from exiting includes:
acquiring output parameters of the generator;
judging whether the generator is about to exit or not according to the output parameters;
and if the generator is judged to be about to exit, sending a control signal to the converter, wherein the control signal is used for indicating the converter to carry out protection shutdown.
A second aspect of an embodiment of the present invention provides a generator exit protection device, where the generator supplies power to a load through a converter, and the generator exit protection device includes:
the acquisition module is used for acquiring output parameters of the generator;
the judging module is used for judging whether the generator is about to exit or not according to the output parameters;
and the sending module is used for sending a control signal to the converter if the generator is judged to be about to exit, and the control signal is used for indicating the converter to carry out protection shutdown.
A third aspect of the embodiments of the present invention provides a terminal device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the generator exit protection method according to the first aspect when executing the computer program.
A fourth aspect of embodiments of the present invention provides a computer-readable storage medium, in which a computer program is stored, which, when executed by one or more processors, performs the steps of the generator exit protection method according to the first aspect.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: the generator in the embodiment of the invention supplies power to the load through the converter, the embodiment of the invention can judge whether the generator is about to exit according to the output parameters of the generator, and if the generator is judged to exit, a control signal is sent to the converter to enable the converter to carry out protection shutdown, so that the generator stops supplying power to the load, the condition that the load fails due to oscillation phenomenon when the generator exits can be prevented, and the load can be protected.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic flow chart illustrating an implementation of a generator exit protection method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a generator for supplying power to a load according to an embodiment of the present invention;
FIG. 3 is a schematic block diagram of a generator exit protection apparatus provided in an embodiment of the present invention;
fig. 4 is a schematic block diagram of a terminal device according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Fig. 1 is a schematic flow chart of an implementation of a generator exit protection method according to an embodiment of the present invention, and for convenience of description, only a part related to the embodiment of the present invention is shown. The execution main body of the embodiment of the invention can be terminal equipment.
Fig. 2 is a schematic structural diagram of a generator for supplying power to a load according to an embodiment of the present invention. As shown in fig. 2, the generator 21 supplies power to the load 23 through the converter 22 during normal operation, and the battery 24 supplies power to the load 23 through the converter 22 after the generator 21 is withdrawn. The converter 22 may be an AC/DC converter, or may include an AC/DC converter and a DC/AC converter. The specific structure of the converter 22 can be set according to the requirements of the load 23.
As shown in fig. 1, the method may include the steps of:
s101: and acquiring output parameters of the generator.
Wherein, the output parameter of the generator can be obtained by adopting the existing method.
Alternatively, the output parameters of the generator may be obtained in real time.
S102: and judging whether the generator is about to exit or not according to the output parameters.
Alternatively, whether the generator is about to exit may be determined according to the output parameters of the generator obtained in real time, and if it is determined that the generator is not about to exit, the process returns to S101 to continue the loop execution.
S103: and if the generator is judged to be about to exit, sending a control signal to the converter, wherein the control signal is used for indicating the converter to carry out protection shutdown.
In the embodiment of the invention, if the generator is judged to be about to exit according to the output parameters of the generator, a control signal is sent to the converter. The converter can be used for carrying out protection shutdown according to the control signal, namely, the electric connection relation between the generator and the load is disconnected, so that the generator does not continue to supply power to the load any more, and the purpose of protecting the load can be achieved. When the generator no longer supplies power to the load, the battery may supply power to the load through the converter.
As can be seen from the above description, the generator in the embodiment of the present invention supplies power to the load through the converter, and the embodiment of the present invention may determine whether the generator is about to exit according to the output parameter of the generator, and if it is determined that the generator is about to exit, send a control signal to the converter to enable the converter to perform a protection shutdown, so that the generator stops supplying power to the load, thereby preventing the load from malfunctioning due to an oscillation phenomenon when the generator exits, and protecting the load.
In one embodiment of the present invention, the output parameter includes an output frequency;
the above S102 may include the steps of:
acquiring the reduction rate of the output frequency within a first preset time;
if the reduction rate of the output frequency is not less than a first preset percentage in a first preset time, judging that the generator is about to exit;
and if the reduction rate of the output frequency in the first preset time is less than a first preset percentage, judging that the generator is not about to exit.
In the process of exiting the generator, the output frequency of the generator is reduced at a certain speed, and whether the generator is about to exit can be judged according to the reduction rate of the output frequency within a certain time.
The decreasing rate of the output frequency within the first preset time may be obtained by subtracting the output frequency at the end of the first preset time from the output frequency at the start of the first preset time to obtain a frequency difference, and the frequency difference is divided by the output frequency at the start of the first preset time to obtain the decreasing rate of the output frequency within the first preset time.
The first preset time may be set according to actual needs, for example, the current time may be used as the end time of the first preset time, and then a period of time is pushed forward from the current time to be used as the start time of the first preset time, where the duration of the first preset time is generally a smaller duration. The first preset percentage is greater than 0, and the specific value of the first preset percentage can be set according to actual requirements.
In an embodiment of the present invention, in the step S103, sending the control signal to the converter may include the following steps:
determining the moment when the output frequency is reduced to a preset frequency lower limit value according to the current output frequency value and the reduction rate of the output frequency within a first preset time;
sending a control signal to the converter at the moment when the output frequency is reduced to the preset frequency lower limit value, or sending a control signal to the converter at the moment when the output frequency is reduced to the preset frequency lower limit value; the control signal is used for indicating the converter to carry out protective shutdown at the moment when the output frequency is reduced to the preset frequency lower limit value.
The lower limit value of the frequency may be an output frequency value at which the generator starts to affect the load performance during the exiting process. That is, if the output frequency of the generator is lower than the lower frequency limit value during the exiting process, the load may be affected, and the load may malfunction.
In the embodiment of the invention, the moment when the output frequency is reduced to the lower limit value of the frequency can be predicted according to the current output frequency value and the reduction rate of the output frequency within the first preset time, and the converter is controlled to be protected and shut down at the moment, so that the utilization rate of the generator can be improved on the premise of protecting the load.
Specifically, a control signal can be sent to the converter at the moment when the predicted output frequency is reduced to the lower frequency limit value, and the converter is immediately subjected to protection shutdown after receiving the control signal; or sending a control signal containing the moment when the output frequency is reduced to the preset frequency lower limit value to the converter, and after receiving the control signal, the converter carries out protection shutdown at the moment when the output frequency is reduced to the preset frequency lower limit value.
In one embodiment of the invention, the output parameter further comprises at least one of an output voltage magnitude, an output current magnitude and an output phase;
if the rate of decrease of the output frequency is not less than the first preset percentage within the first preset time, determining that the generator is about to exit, including:
if the reduction rate of the output frequency is not less than a first preset percentage within a first preset time and a first preset condition is met, judging that the generator is about to exit;
the first preset condition comprises at least one of that the falling rate of the output voltage amplitude is not less than a second preset percentage in a first preset time, that the falling rate of the output current amplitude is not less than a third preset percentage in the first preset time, and that the falling rate of the change rate of the output phase is not less than a fourth preset percentage in the first preset time.
In the process of exiting the generator, except that the output frequency is reduced at a certain rule, the amplitude of the output voltage, the amplitude of the output current and the change rate of the output phase are also reduced at a certain rule. In order to improve the accuracy of the result of judging whether the generator is about to exit, at least one of the amplitude of the output voltage, the amplitude of the output current and the change rate of the output phase can be combined with the output frequency to jointly judge whether the generator is about to exit.
The second preset percentage, the third preset percentage and the fourth preset percentage are all larger than 0, and the specific values can be set according to actual requirements.
In one embodiment of the invention, the generator exit protection method further comprises:
acquiring a first frequency reduction rate and a second frequency reduction rate; the first frequency reduction rate is the reduction rate of the output frequency of the generator within a first preset time in the exit process when the generator is in no-load state, and the second frequency reduction rate is the reduction rate of the output frequency of the generator within the first preset time in the exit process when the generator is in load state;
and obtaining a first preset percentage according to the first frequency reduction rate and the second frequency reduction rate.
In an embodiment of the invention, the value of the first preset percentage may be determined by testing the generator. The generator load may be a generator full load.
The first preset percentage is obtained according to the first frequency decreasing rate and the second frequency decreasing rate, the first preset percentage may be obtained by averaging the first frequency decreasing rate and the second frequency decreasing rate, the first preset percentage may also be obtained by performing weighted summation on the first frequency decreasing rate and the second frequency decreasing rate, or any other realizable manner, which is not specifically limited herein.
In addition, the second preset percentage, the third preset percentage and the fourth preset percentage may also be determined by a similar method, and are not described again.
In one embodiment of the invention, the output parameter comprises an output frequency;
the above S102 may include the steps of:
acquiring the reduction rate of the output frequency within a second preset time;
if the falling rate of the output frequency is within the range of the falling rate of the preset frequency within the second preset time, judging that the generator is about to exit;
and if the falling rate of the output frequency is not in the range of the falling rate of the preset frequency within the second preset time, judging that the generator is not about to exit.
During the exiting process of the generator, the output frequency of the generator is reduced at a certain rate, and whether the generator is about to exit can be judged according to the reduction rate of the output frequency within a period of time.
The decreasing rate of the output frequency within the second preset time may be obtained by subtracting the output frequency at the end of the second preset time from the output frequency at the start of the second preset time to obtain a frequency difference, and the frequency difference is in the second preset time to obtain the decreasing rate of the output frequency within the second preset time.
The second preset time may be set according to actual requirements, for example, the current time may be used as an end time of the second preset time, and then a period of time is pushed forward from the current time to be used as a start time of the second preset time, where the duration of the second preset time is generally a smaller duration.
If the output frequency falling rate is within a certain range of the output frequency falling rate within a second preset time, namely within a preset frequency falling rate range, judging that the generator is about to exit; otherwise, the generator is determined not to be about to exit.
Wherein the predetermined frequency reduction rate range can be determined by testing the generator. Illustratively, a first frequency decreasing rate and a second frequency decreasing rate are obtained; the first frequency reduction rate is the reduction rate of the output frequency of the generator within second preset time in the exit process when the generator is in no-load state, and the second frequency reduction rate is the reduction rate of the output frequency of the generator within second preset time in the exit process when the generator is in load state; the predetermined frequency reduction rate range is a range consisting of the first frequency reduction rate, the second frequency reduction rate and a value therebetween.
Optionally, the time when the output frequency drops to the preset frequency lower limit value may be determined according to the current output frequency value and the rate of drop of the output frequency within the second preset time; sending a control signal to the converter at the moment when the output frequency is reduced to the preset frequency lower limit value, or sending a control signal to the converter at the moment when the output frequency is reduced to the preset frequency lower limit value; the control signal is used for indicating the converter to carry out protective shutdown at the moment when the output frequency is reduced to the preset frequency lower limit value.
In one embodiment of the invention, the output parameter further comprises at least one of an output voltage magnitude, an output current magnitude and an output phase;
if the falling rate of the output frequency is within the range of the falling rate of the preset frequency within the second preset time, determining that the generator is about to exit, wherein the method comprises the following steps:
if the falling rate of the output frequency is within the range of the falling rate of the preset frequency within the second preset time and the second preset condition is met, judging that the generator is about to exit;
the second preset condition includes at least one of a falling rate of the output voltage amplitude within a preset voltage amplitude falling rate range within a second preset time, a falling rate of the output current amplitude within a preset current amplitude falling rate range within a second preset time, and a falling rate of a change rate of the output phase within a second preset time within a falling rate range of a change rate of the preset phase.
In the process of exiting the generator, besides the output frequency is reduced at a certain rate, the amplitude of the output voltage, the amplitude of the output current and the change rate of the output phase are also reduced at a certain rate. In order to improve the accuracy of the result of judging whether the generator is about to exit, at least one of the amplitude of the output voltage, the amplitude of the output current and the change rate of the output phase can be combined with the output frequency to jointly judge whether the generator is about to exit.
The determination method of the predetermined voltage amplitude reduction rate range, the predetermined current amplitude reduction rate range and the predetermined phase change rate reduction rate range is similar to the determination method of the predetermined frequency reduction rate range, and is not described again.
Alternatively, the determination of whether the generator is about to exit may be based on a rate of decrease of the output parameter and a rate of decrease of the output parameter over a period of time.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
Corresponding to the generator quitting protection method, an embodiment of the invention also provides a generator quitting protection device, which has the same beneficial effects as the generator quitting protection method. Fig. 3 is a schematic block diagram of a generator exit protection device according to an embodiment of the present invention, and for convenience of description, only the portions related to the embodiment of the present invention are shown.
In the embodiment of the present invention, the generator supplies power to the load through the converter, and the generator exit protection device 30 may include an obtaining module 301, a determining module 302, and a sending module 303.
The acquisition module 301 is used for acquiring output parameters of the generator;
a judging module 302, configured to judge whether the generator is about to exit according to the output parameter;
and the sending module 303 is configured to send a control signal to the converter if it is determined that the generator is about to exit, where the control signal is used to instruct the converter to perform protection shutdown.
In one embodiment of the present invention, the output parameter includes an output frequency;
the determining module 302 is specifically configured to:
acquiring the reduction rate of the output frequency within a first preset time;
if the reduction rate of the output frequency is not less than a first preset percentage in a first preset time, judging that the generator is about to exit;
and if the reduction rate of the output frequency in the first preset time is less than a first preset percentage, judging that the generator is not about to exit.
In an embodiment of the present invention, the sending module 303 may further be configured to:
determining the moment when the output frequency is reduced to a preset frequency lower limit value according to the current output frequency value and the reduction rate of the output frequency within a first preset time;
sending a control signal to the converter at the moment when the output frequency is reduced to the preset frequency lower limit value, or sending a control signal to the converter at the moment when the output frequency is reduced to the preset frequency lower limit value; the control signal is used for indicating the converter to carry out protective shutdown at the moment when the output frequency is reduced to the preset frequency lower limit value.
In one embodiment of the invention, the output parameter further comprises at least one of an output voltage magnitude, an output current magnitude and an output phase;
the determining module 302 may further be configured to:
if the reduction rate of the output frequency is not less than a first preset percentage within a first preset time and a first preset condition is met, judging that the generator is about to exit;
the first preset condition comprises at least one of that the falling rate of the output voltage amplitude is not less than a second preset percentage in a first preset time, that the falling rate of the output current amplitude is not less than a third preset percentage in the first preset time, and that the falling rate of the change rate of the output phase is not less than a fourth preset percentage in the first preset time.
In one embodiment of the invention, the output parameter comprises an output frequency;
the determining module 302 is specifically configured to:
acquiring the reduction rate of the output frequency within a second preset time;
if the falling rate of the output frequency is within the range of the falling rate of the preset frequency within the second preset time, judging that the generator is about to exit;
and if the falling rate of the output frequency is not in the range of the falling rate of the preset frequency within the second preset time, judging that the generator is not about to exit.
In an embodiment of the present invention, the output parameter further includes at least one of an output voltage amplitude, an output current amplitude, and an output phase;
the determining module 302 may further be configured to:
if the falling rate of the output frequency is within the range of the falling rate of the preset frequency within the second preset time and the second preset condition is met, judging that the generator is about to exit;
the second preset condition includes at least one of a falling rate of the output voltage amplitude within a preset voltage amplitude falling rate range within a second preset time, a falling rate of the output current amplitude within a preset current amplitude falling rate range within a second preset time, and a falling rate of a change rate of the output phase within a second preset time within a falling rate range of a change rate of the preset phase.
In an embodiment of the present invention, the generator exit protection device 30 may further include a parameter determination module.
The parameter determination module is to:
acquiring a first frequency reduction rate and a second frequency reduction rate; the first frequency reduction rate is the reduction rate of the output frequency of the generator within a first preset time in the exit process when the generator is in no-load state, and the second frequency reduction rate is the reduction rate of the output frequency of the generator within the first preset time in the exit process when the generator is in load state;
and obtaining a first preset percentage according to the first frequency reduction rate and the second frequency reduction rate.
It is obvious to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional units and modules is merely used as an example, and in practical applications, the above function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the generator exit protection device is divided into different functional units or modules to perform all or part of the above described functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the above-mentioned apparatus may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
Fig. 4 is a schematic block diagram of a terminal device according to an embodiment of the present invention. As shown in fig. 4, the terminal device 40 of this embodiment includes: one or more processors 401, a memory 402, and a computer program 403 stored in the memory 402 and executable on the processors 401. The processor 401, when executing the computer program 403, implements the steps in the above-described embodiments of the generator exit protection method, such as the steps S101 to S103 shown in fig. 1. Alternatively, the processor 401, when executing the computer program 403, implements the functions of the modules/units in the above-described generator exit protection device embodiment, such as the functions of the modules 301 to 303 shown in fig. 3.
Illustratively, the computer program 403 may be partitioned into one or more modules/units that are stored in the memory 402 and executed by the processor 401 to accomplish the present application. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used for describing the execution process of the computer program 403 in the terminal device 40. For example, the computer program 403 may be divided into an acquisition module, a judgment module and a transmission module, and the specific functions of each module are as follows:
the acquisition module is used for acquiring output parameters of the generator;
the judging module is used for judging whether the generator is about to exit or not according to the output parameters;
and the sending module is used for sending a control signal to the converter if the generator is judged to be about to exit, and the control signal is used for indicating the converter to carry out protection shutdown.
Other modules or units can refer to the description of the embodiment shown in fig. 3, and are not described again here.
The terminal device 40 may be a computing device such as a desktop computer, a notebook, a palm computer, and a cloud server. The terminal device 40 may also be the load itself. The terminal device 40 includes, but is not limited to, a processor 401 and a memory 402. Those skilled in the art will appreciate that fig. 4 is only one example of a terminal device 40, and does not constitute a limitation to the terminal device 40, and may include more or less components than those shown, or combine some components, or different components, for example, the terminal device 40 may further include an input device, an output device, a network access device, a bus, etc.
The Processor 401 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage 402 may be an internal storage unit of the terminal device 40, such as a hard disk or a memory of the terminal device 40. The memory 402 may also be an external storage device of the terminal device 40, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a flash memory Card (FlashCard), and the like, which are provided on the terminal device 40. Further, the memory 402 may also include both an internal storage unit of the terminal device 40 and an external storage device. The memory 402 is used for storing the computer program 403 and other programs and data required by the terminal device 40. The memory 402 may also be used to temporarily store data that has been output or is to be output.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed generator exit protection apparatus and method may be implemented in other ways. For example, the above-described generator exit protection device embodiments are merely illustrative, and for example, the division of the modules or units is only one logical function division, and there may be other division ways in actual implementation, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method of the embodiments described above can be realized by a computer program, which can be stored in a computer-readable storage medium and can realize the steps of the embodiments of the methods described above when the computer program is executed by a processor. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media which may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. The generator quitting protection method is characterized in that the generator supplies power to a load through a converter; the generator exit protection method comprises the following steps:
acquiring output parameters of the generator;
judging whether the generator is about to exit or not according to the output parameters;
and if the generator is judged to be about to exit, sending a control signal to the converter, wherein the control signal is used for indicating the converter to carry out protection shutdown.
2. The generator dropout protection method of claim 1 wherein the output parameter comprises an output frequency;
the judging whether the generator is about to exit according to the output parameters comprises the following steps:
acquiring the reduction rate of the output frequency within a first preset time;
if the reduction rate of the output frequency is not less than a first preset percentage in the first preset time, judging that the generator is about to exit;
and if the reduction rate of the output frequency is smaller than the first preset percentage in the first preset time, judging that the generator is not about to exit.
3. The generator dropout protection method of claim 2 wherein said sending a control signal to said converter comprises:
determining the moment when the output frequency is reduced to a preset frequency lower limit value according to the current output frequency value and the reduction rate of the output frequency within the first preset time;
sending a control signal to the converter at the moment when the output frequency is reduced to a preset frequency lower limit value, or sending a control signal to the converter at the moment when the output frequency is reduced to the preset frequency lower limit value; the control signal is used for indicating the converter to carry out protective shutdown at the moment when the output frequency is reduced to a preset frequency lower limit value.
4. The generator backout protection method of claim 2, wherein the output parameters further comprise at least one of an output voltage magnitude, an output current magnitude, and an output phase;
if the reduction rate of the output frequency is not less than a first preset percentage within the first preset time, determining that the generator is about to exit, including:
if the reduction rate of the output frequency is not less than a first preset percentage within the first preset time and a first preset condition is met, determining that the generator is about to exit;
the first preset condition includes at least one of a falling rate of the output voltage amplitude within the first preset time being not less than a second preset percentage, a falling rate of the output current amplitude within the first preset time being not less than a third preset percentage, and a falling rate of a change rate of the output phase within the first preset time being not less than a fourth preset percentage.
5. The generator dropout protection method of claim 1 wherein the output parameter comprises an output frequency;
the judging whether the generator is about to exit according to the output parameters comprises the following steps:
acquiring the descending rate of the output frequency within a second preset time;
if the falling rate of the output frequency is within a preset frequency falling rate range within the second preset time, judging that the generator is about to exit;
and if the falling rate of the output frequency is not in the range of the preset frequency falling rate within the second preset time, judging that the generator is not about to exit.
6. The generator backout protection method of claim 5, wherein the output parameters further comprise at least one of an output voltage magnitude, an output current magnitude, and an output phase;
if the falling rate of the output frequency is within a preset frequency falling rate range within the second preset time, determining that the generator is about to exit, including:
if the falling rate of the output frequency is within the range of the falling rate of the preset frequency within the second preset time and a second preset condition is met, judging that the generator is about to exit;
the second preset condition includes at least one of that a falling rate of the output voltage amplitude is within a preset voltage amplitude falling rate range within the second preset time, that a falling rate of the output current amplitude is within a preset current amplitude falling rate range within the second preset time, and that a falling rate of a change rate of the output phase is within a preset phase change rate range within the second preset time.
7. The generator dropout protection method of any one of claims 2 to 6, further comprising:
acquiring a first frequency reduction rate and a second frequency reduction rate; the first frequency reduction rate is the reduction rate of the output frequency of the generator within a first preset time in the exiting process when the generator is in no-load state, and the second frequency reduction rate is the reduction rate of the output frequency of the generator within the first preset time in the exiting process when the generator is in load state;
and obtaining the first preset percentage according to the first frequency reduction rate and the second frequency reduction rate.
8. The generator exit protection device is characterized in that the generator supplies power to a load through a converter; the generator exit protection device comprises:
the acquisition module is used for acquiring output parameters of the generator;
the judging module is used for judging whether the generator is about to exit or not according to the output parameters;
and the sending module is used for sending a control signal to the converter if the generator is determined to be about to exit, wherein the control signal is used for indicating the converter to carry out protection shutdown.
9. Terminal device comprising a memory, a processor and a computer program stored in said memory and executable on said processor, characterized in that said processor, when executing said computer program, carries out the steps of the generator exit protection method according to any of claims 1 to 7.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which, when executed by one or more processors, implements the steps of the generator exit protection method according to any one of claims 1 to 7.
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