CN111693811A - Test method, device and equipment for low-frequency low-voltage load shedding protection system - Google Patents
Test method, device and equipment for low-frequency low-voltage load shedding protection system Download PDFInfo
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Abstract
The invention discloses a test method of a low-frequency low-voltage load shedding protection system, which can determine a protection trigger parameter of the low-frequency low-voltage load shedding protection system to be tested by combining output characteristic data when a target micro-grid system fails due to overload. The invention also discloses a testing device and equipment of the low-frequency low-voltage load shedding protection system, and the testing device and equipment have the same beneficial effects as the testing method of the low-frequency low-voltage load shedding protection system.
Description
Technical Field
The invention relates to the field of power systems, in particular to a test method of a low-frequency low-voltage load shedding protection system, and also relates to a test device and equipment of the low-frequency low-voltage load shedding protection system.
Background
The frequency and the voltage of an electric power system are important quality indexes for reflecting whether the active power and the reactive power of a power grid are balanced or not, in a conventional large power grid system, frequency and voltage deviation caused by load change is generally limited by special equipment, however, an independent micro-grid system does not have regulation capacity under most conditions, so that a low-voltage low-frequency load shedding protection system is often selected for regulating and controlling the frequency and the voltage aiming at the micro-grid system, and the critical protection equipment has great significance on whether the protection function can be achieved or not.
Therefore, how to provide a solution to the above technical problem is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a test method of a low-frequency low-voltage load shedding protection system, which can directly apply the low-frequency low-voltage load shedding protection system to be tested to a target micro-grid after the test is qualified, has strong reliability and low probability of failure of protection, and prevents the occurrence of power utilization safety accidents; the invention also aims to provide a testing device and a testing system for the low-frequency low-voltage load shedding protection system, which can directly apply the low-frequency low-voltage load shedding protection system to be tested to a target micro-grid after the low-frequency low-voltage load shedding protection system is tested to be qualified, have strong reliability and low probability of protection failure and prevent the occurrence of power utilization safety accidents.
In order to solve the technical problem, the invention provides a test method of a low-frequency low-voltage load shedding protection system, which comprises the following steps:
acquiring output characteristic data when a target micro-grid system fails due to overload;
determining a protection triggering parameter of the low-frequency low-voltage load shedding protection system to be tested according to the output characteristic data;
and testing the low-frequency low-voltage load shedding protection system to be tested according to the protection trigger parameters to obtain a test result.
Preferably, the acquiring output characteristic data when the target microgrid system fails due to overload includes:
adjusting the load of the target micro-grid system to overload the target micro-grid system;
acquiring output characteristic data when a power supply of the target micro-grid system fails due to overload;
the method for determining the protection triggering parameters of the low-frequency low-voltage load-shedding protection system to be tested according to the output characteristic data specifically comprises the following steps:
and determining the protection triggering parameters of the low-frequency low-voltage load shedding protection system to be tested through preset data analysis software according to the output characteristic data.
Preferably, the protection trigger parameter includes a voltage set value, a frequency set value, a voltage slip set value and a frequency slip set value.
Preferably, when the target microgrid system does not have a voltage minimum threshold and a frequency minimum threshold, the failure due to overload is particularly breakdown due to overload;
when the target microgrid system itself has the voltage minimum threshold and the frequency minimum threshold, the failure due to overload is particularly when the voltage of the target microgrid decreases to the voltage minimum threshold and/or the frequency decreases to the frequency minimum threshold;
when the target microgrid system has the voltage lowest threshold and the frequency lowest threshold, the voltage set value is the voltage lowest threshold, and the frequency set value is the frequency lowest threshold.
Preferably, after the low-frequency low-voltage load shedding protection system to be tested is tested according to the protection trigger parameter and a test result is obtained, the test method of the low-frequency low-voltage load shedding protection system further includes:
and controlling a prompter to prompt the test result.
Preferably, the acquiring of the output characteristic data of the power supply of the target microgrid system specifically includes:
and acquiring output characteristic data of the power supply of the target micro-grid system through an oscilloscope or a digital multimeter.
Preferably, the step of testing the low-frequency low-voltage load shedding protection system to be tested according to the protection trigger parameter and obtaining a test result includes:
designing a test case according to the protection triggering parameters;
controlling the target micro-grid system according to the test case;
and obtaining a test result according to the protection state of the low-frequency low-voltage load shedding protection system to be tested in the target micro-grid system.
Preferably, the test case specifically includes a forward test, and further includes at least one of a reverse test, an abnormal test, and a daily simulation test;
the forward test is as follows:
simulating a load overload in the target microgrid;
under the overload condition, judging whether the low-frequency low-voltage load shedding protection system to be tested can act when the electric energy parameter of the target micro-grid reaches the protection trigger parameter;
if the target micro-grid system is not broken down, the low-frequency low-voltage load shedding protection system to be tested is qualified;
the reverse test is as follows:
simulating load shedding and loading actions in the target microgrid without exceeding the protection triggering parameters;
judging whether the low-frequency low-voltage load shedding protection system to be tested acts or not;
if not, the low-frequency low-voltage load shedding protection system to be tested is qualified;
the exception test is as follows:
simulating an abnormal state in the target microgrid;
judging whether the low-frequency low-voltage load shedding protection system to be tested acts or not;
if not, the low-frequency low-voltage load shedding protection system to be tested is qualified;
wherein the abnormal state comprises at least one of a communication failure, a power failure shutdown, a dual power source switch maintenance outage, and an impact load acceptable to the target microgrid system;
the daily simulation test is as follows:
controlling the target micro-grid to supply power for a preset time length for a preset type of load;
judging whether the low-frequency low-voltage load shedding protection system to be tested acts or not;
and if the low-frequency low-voltage load shedding protection system does not act, the low-frequency low-voltage load shedding protection system to be tested is qualified.
In order to solve the above technical problem, the present invention further provides a testing apparatus for a low-frequency low-voltage load shedding protection system, comprising:
the acquisition module is used for acquiring output characteristic data when the target microgrid system fails due to overload;
the determining module is used for determining a protection triggering parameter of the low-frequency low-voltage load shedding protection system to be tested according to the output characteristic data;
and the test module is used for testing the low-frequency low-voltage load shedding protection system to be tested according to the protection trigger parameters and obtaining a test result.
In order to solve the above technical problem, the present invention further provides a testing apparatus for a low-frequency low-voltage load shedding protection system, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the method for testing a low frequency and low voltage load shedding protection system as described in any one of the above when executing the computer program.
The invention provides a test method of a low-frequency low-voltage load shedding protection system, which can determine a protection trigger parameter of the low-frequency low-voltage load shedding protection system to be tested by combining output characteristic data when a target micro-grid system fails due to overload.
The invention also provides a testing device and equipment of the low-frequency low-voltage load shedding protection system, and the testing device and equipment have the same beneficial effects as the testing method of the low-frequency low-voltage load shedding protection system.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments 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 without creative efforts.
Fig. 1 is a schematic flow chart of a testing method of a low-frequency low-voltage load shedding protection system according to the present invention;
FIG. 2 is a schematic structural diagram of a testing apparatus of a low-frequency low-voltage load-shedding protection system according to the present invention;
fig. 3 is a schematic structural diagram of a testing apparatus of a low-frequency low-voltage load-shedding protection system according to the present invention.
Detailed Description
The core of the invention is to provide a test method of the low-frequency low-voltage load shedding protection system, after the test is qualified, the low-frequency low-voltage load shedding protection system to be tested can be directly applied to a target micro-grid, the reliability is strong, the probability of the occurrence of protection failure is low, and the occurrence of power utilization safety accidents is prevented; the other core of the invention is to provide a testing device and a system of the low-frequency low-voltage load shedding protection system, after the testing is qualified, the low-frequency low-voltage load shedding protection system to be tested can be directly applied to a target micro-grid, the reliability is strong, the probability of the occurrence of the protection failure is low, and the occurrence of power utilization safety accidents is prevented.
Referring to fig. 1, fig. 1 is a schematic flow chart of a testing method of a low-frequency and low-voltage load shedding protection system provided by the present invention, where the testing method of the low-frequency and low-voltage load shedding protection system includes:
step S1: acquiring output characteristic data when a target micro-grid system fails due to overload;
specifically, the failure due to overload refers to a decrease in power supply output voltage and frequency of the target microgrid system caused by overload of the target microgrid system, and finally directly causes the target microgrid system to crash or triggers a stop of operation caused by a set value of voltage and/or frequency of the target microgrid system.
Specifically, the output characteristic data may refer to various output indexes of the power source in the target microgrid system, such as a voltage waveform and a frequency waveform, and the embodiments of the present invention are not limited herein.
Specifically, the output characteristic data acquired in the step can be used as a data basis of subsequent steps, so that whether the low-frequency low-voltage load shedding protection system to be tested can play a good protection role in the target micro-grid system or not can be conveniently tested in the subsequent steps.
Step S2: determining a protection triggering parameter of the low-frequency low-voltage load shedding protection system to be tested according to the output characteristic data;
specifically, the low-frequency low-voltage load shedding protection system has the function that when the micro-grid system is overloaded, the frequency voltage of the micro-grid system is conditioned so as to normally operate the micro-grid system, and because the output characteristic data is data when the target micro-grid system fails due to overload, the protection trigger parameters of the low-frequency low-voltage load shedding protection system to be tested can be determined through the output characteristic data, namely when the low-frequency low-voltage load shedding protection system to be tested is applied to the target micro-grid system, the low-frequency low-voltage load shedding protection system to be tested should act when the output index of the target micro-grid system reaches the protection trigger parameters so as to protect the target micro-grid system.
The determined protection triggering parameters can be used as data bases in subsequent steps.
Step S3: and testing the low-frequency low-voltage load shedding protection system to be tested according to the protection trigger parameters and obtaining a test result.
Specifically, because the protection trigger parameter is obtained, the low-frequency low-voltage load shedding protection system to be tested can be tested according to the protection trigger parameter, for example, the simplest test can be as follows: and judging whether the output index in the microgrid system can act when reaching the value of the protection triggering parameter, wherein the embodiment of the invention is not limited herein.
The invention provides a test method of a low-frequency low-voltage load shedding protection system, which can determine a protection trigger parameter of the low-frequency low-voltage load shedding protection system to be tested by combining output characteristic data when a target micro-grid system fails due to overload.
On the basis of the above-described embodiment:
as a preferred embodiment, the acquiring output characteristic data when the target microgrid system fails due to overload includes:
adjusting the load of the target micro-grid system to overload the target micro-grid system;
acquiring output characteristic data when a power supply of a target micro-grid system fails due to overload;
the method comprises the following steps of determining protection triggering parameters of the low-frequency low-voltage load shedding protection system to be tested according to the output characteristic data:
and determining the protection triggering parameters of the low-frequency low-voltage load shedding protection system to be tested through preset data analysis software according to the output characteristic data.
Specifically, when the output characteristic data are collected, the target microgrid system should not be connected with the low-frequency low-voltage load shedding protection system to be tested, the load of the target microgrid system can be adjusted to overload the target microgrid system, the output characteristic data when the power supply fails due to overload under the overload condition is collected and obtained, namely the output characteristic data when the target microgrid system is imminent to fail is obtained, and then the protection trigger parameters of the low-frequency low-voltage protection system to be tested can be determined by using preset data analysis software.
The working efficiency can be improved by determining the protection triggering parameters by using the preset data analysis software.
Of course, besides the preset data analysis software, the protection triggering parameters may also be determined by manually analyzing the output characteristic data by a worker, which is not limited herein in the embodiment of the present invention.
Specifically, adjusting the load of the target microgrid system to overload the target microgrid system may specifically be:
with the adjustable RLC load, the resistive, inductive and capacitive overload and combined overload situations that may actually occur are simulated.
The setting of the RLC load overload can be obtained according to the output change required by the microgrid design or the requirement of the microgrid system.
When the protection triggering parameters are determined, a group of protection triggering parameters can be determined for target micro-grid systems of various power types, for example, a group of protection triggering parameters corresponding to the target micro-grid systems of a single power supply and a double power supply, and the like, so that the target micro-grid systems of two different power types can be tested subsequently.
As a preferred embodiment, the protection triggering parameters include a voltage set point, a frequency set point, a voltage slip set point, and a frequency slip set point.
Specifically, the voltage set value, the frequency set value, the voltage slip set value and the frequency slip set value are set parameters of a conventional low-frequency low-voltage load shedding protection system, wherein the slip is also a change rate, because the frequency/voltage of the target microgrid system may also fall below a collapse value if the load changes in a normal load range, but because the microgrid system can quickly adjust the falling frequency or voltage in the normal load range, but if the load changes to cause the microgrid system to be overloaded, the microgrid system cannot adjust the falling frequency or voltage, the voltage slip set value or the frequency slip set value at the moment is necessarily small, that is, whether the microgrid system reaches a stable state or not, and whether the microgrid system reaches the stable state or not can be determined through the voltage slip set value and the frequency slip set value, then, on the basis, if the voltage of the target microgrid system is reduced to a voltage set value and/or the frequency is reduced to a frequency set value, the low-frequency low-voltage load shedding protection system acts.
Of course, the protection trigger parameter may be of other types besides the voltage set value, the frequency set value, the voltage slip set value and the frequency slip set value, and the embodiment of the present invention is not limited herein.
As a preferred embodiment, when the target microgrid system does not have the voltage minimum threshold and the frequency minimum threshold, the failure due to overload is specifically collapsed due to overload;
when the target microgrid system has a voltage minimum threshold and a frequency minimum threshold, the failure due to overload is specifically when the voltage of the target microgrid is reduced to the voltage minimum threshold and/or the frequency is reduced to the frequency minimum threshold;
when the target microgrid system has a voltage lowest threshold and a frequency lowest threshold, the voltage set value is the voltage lowest threshold, and the frequency set value is the frequency lowest threshold.
Specifically, some microgrid systems do not have a voltage minimum threshold and a frequency minimum threshold themselves, in such a microgrid system, when a load overload condition occurs, the voltage and/or the frequency are/is continuously decreased until the microgrid system is crashed, in a microgrid system having a voltage minimum threshold and a frequency minimum threshold, when a load overload condition occurs, as long as the voltage and/or the frequency are/is stably decreased to the corresponding threshold, the microgrid system stops supplying power to all loads (fails), of course, in a microgrid system having a voltage minimum threshold and a frequency minimum threshold, the voltage setting value is the voltage minimum threshold, the frequency setting value is the frequency minimum threshold, and it is not necessary to determine the voltage and the frequency value of the microgrid system which are real and can cause the crash of the microgrid system, the working efficiency is improved.
As a preferred embodiment, after testing the low-frequency and low-voltage load shedding protection system to be tested according to the protection trigger parameter and obtaining the test result, the method for testing the low-frequency and low-voltage load shedding protection system further includes:
and controlling the prompter to prompt a test result.
Specifically, after the test result is obtained, the embodiment of the invention can also control the prompter to prompt the test result, so that a worker can quickly and intuitively obtain the test result and perform corresponding subsequent processing, and the working efficiency is further improved.
The prompt may be of various types, for example, a voice prompt or a display, and the embodiment of the present invention is not limited herein.
As a preferred embodiment, the acquiring of the output characteristic data of the power supply of the target microgrid system specifically includes:
and acquiring output characteristic data of a power supply of the target micro-grid system through an oscilloscope or a digital multimeter.
Specifically, the output characteristic data of the power supply of the target micro-grid system can be quickly, accurately and completely obtained through the oscilloscope or the digital multimeter.
Of course, the acquisition may be performed by other methods or apparatuses besides an oscilloscope or a digital multimeter, and the embodiment of the present invention is not limited herein.
As a preferred embodiment, the step of testing the low-frequency and low-voltage load shedding protection system to be tested according to the protection trigger parameter and obtaining the test result includes:
designing a test case according to the protection triggering parameters;
controlling the target micro-grid system according to the test case;
and obtaining a test result according to the protection state of the low-frequency low-voltage load shedding protection system to be tested in the target micro-grid system.
Specifically, a test case can be designed according to the protection trigger parameters, so that the target micro-grid system can be systematically controlled according to the test case and a test result can be obtained.
The test case may be understood as an explicit test item, for example, in a normal forward test, the forward test refers to testing whether the low-frequency low-voltage load shedding protection system to be tested can normally perform a protection action when an electric energy value output by a power supply in the target microgrid system reaches a value of the protection trigger parameter, and the like.
The low-frequency low-voltage load shedding protection system to be tested can be installed in the target micro-grid system for testing, and the target micro-grid system is a real object to be finally served by the low-frequency low-voltage load shedding protection system, so that a more reliable test result can be obtained by testing in the target micro-grid system.
Of course, the simulation device may also be used to simulate the voltage, frequency and other electrical energy parameters of the microgrid system so as to test the low-frequency and low-voltage load shedding protection system to be tested, and the simulation device may be a relay protection tester and the like, which is not limited herein in the embodiments of the present invention.
As a preferred embodiment, the test case specifically includes a forward test, and further includes at least one of a reverse test, an abnormal test, and a daily simulation test;
the forward test was:
simulating a load overload in the target microgrid;
under the overload condition, judging whether the low-frequency low-voltage load shedding protection system to be tested can act when the electric energy parameter of the target micro-grid reaches a protection trigger parameter;
if the action is carried out and the target micro-grid system is not broken down, the low-frequency low-voltage load shedding protection system to be tested is qualified;
the reverse test was:
under the condition that the protection triggering parameter is not exceeded, simulating load shedding and loading actions in the target microgrid;
judging whether the low-frequency low-voltage load shedding protection system to be tested acts or not;
if not, the low-frequency low-voltage load shedding protection system to be tested is qualified;
the anomaly test is:
simulating an abnormal state in the target microgrid;
judging whether the low-frequency low-voltage load shedding protection system to be tested acts or not;
if not, the low-frequency low-voltage load shedding protection system to be tested is qualified;
the abnormal state comprises at least one of communication fault, power failure shutdown, dual power supply switching maintenance outage and impact load acceptable by a target micro-grid system;
the daily simulation test is as follows:
controlling a target micro-grid to supply power for a preset type of load for a preset time;
judging whether the low-frequency low-voltage load shedding protection system to be tested acts or not;
and if the low-frequency low-voltage load shedding protection system does not act, the low-frequency low-voltage load shedding protection system to be tested is qualified.
Specifically, the test of the low-frequency low-voltage load shedding protection system to be tested is a forward test under normal conditions, although some low-frequency low-voltage load shedding protection systems to be tested can pass the forward test, the low-frequency low-voltage load shedding protection system to be tested is unqualified in a reverse test, namely, a target micro-grid system stops running due to false operation generated in the normal loading or load shedding process of the target micro-grid system, and therefore the reverse test is designed in the embodiment of the invention to further perfect the test of the low-frequency low-voltage load shedding protection system to be tested.
In the forward test, if the low-frequency low-voltage load shedding protection system to be tested does not act and the target microgrid system collapses, the low-frequency low-voltage load shedding protection system to be tested can be judged to be unqualified, if the low-frequency low-voltage load shedding protection system to be tested acts and the target microgrid system collapses, the low-frequency low-voltage load shedding protection system to be tested can be judged to be unqualified, and if the low-frequency low-voltage load shedding protection system to be tested does not act but the target microgrid system does not collapse, the trigger parameters may be protected or the test cases may be unreasonable.
The abnormal test in the embodiment of the invention can test whether the low-frequency low-voltage load shedding protection system to be tested generates false operation under the abnormal states, further enriches the test of the low-frequency low-voltage load shedding protection system to be tested, and enables the test to be more comprehensive.
Specifically, the daily simulation test refers to simulating the load condition which may occur in the daily process of the target microgrid, for example, continuously supplying power to a first type of load for a preset time, continuously supplying power to a second type of load for a preset time, and the like, and determining whether the low-frequency low-voltage load shedding protection system to be tested generates misoperation in the process.
The preset type may be a linear load, a nonlinear load, or the like, and the preset duration may be 12 hours, or the like, both of which may be set autonomously, and the embodiment of the present invention is not limited herein.
The simulating load overload in the target microgrid may be simulating various overload conditions by using the RLC load, and may include resistive, inductive, capacitive or a combination thereof, and under the condition that the protection trigger parameter is not exceeded, simulating load shedding and loading actions in the target microgrid may also be changing according to a specified proportion by using the RLC load, and may also include resistive, inductive, capacitive or a combination thereof, which is not limited herein.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a testing apparatus of a low-frequency low-voltage load-shedding protection system provided in the present invention, including:
the acquisition module 1 is used for acquiring output characteristic data when a target microgrid system fails due to overload;
the determining module 2 is used for determining a protection triggering parameter of the low-frequency low-voltage load shedding protection system to be tested according to the output characteristic data;
and the test module 3 is used for testing the low-frequency low-voltage load shedding protection system to be tested according to the protection trigger parameters and obtaining a test result.
For the description of the testing apparatus of the low-frequency and low-voltage load shedding protection system provided in the embodiment of the present invention, please refer to the embodiment of the testing method of the low-frequency and low-voltage load shedding protection system, which is not described herein again.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a testing apparatus of a low-frequency and low-voltage load-shedding protection system provided in the present invention, including:
a memory 4 for storing a computer program;
a processor 5, configured to implement the steps of the method for testing a low-frequency low-voltage load shedding protection system as described in any one of the above when executing a computer program.
For the description of the test equipment of the low-frequency and low-voltage load shedding protection system provided in the embodiment of the present invention, reference is made to the foregoing embodiment of the test method of the low-frequency and low-voltage load shedding protection system, and details of the embodiment of the present invention are not repeated herein.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It should also be noted that, in the present specification, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A test method of a low-frequency low-voltage load-shedding protection system is characterized by comprising the following steps:
acquiring output characteristic data when a target micro-grid system fails due to overload;
determining a protection triggering parameter of the low-frequency low-voltage load shedding protection system to be tested according to the output characteristic data;
and testing the low-frequency low-voltage load shedding protection system to be tested according to the protection trigger parameters to obtain a test result.
2. The method for testing the low-frequency low-voltage load shedding protection system according to claim 1, wherein the step of acquiring output characteristic data when the target microgrid system fails due to overload comprises the following steps:
adjusting the load of the target micro-grid system to overload the target micro-grid system;
acquiring output characteristic data when a power supply of the target micro-grid system fails due to overload;
the method for determining the protection triggering parameters of the low-frequency low-voltage load-shedding protection system to be tested according to the output characteristic data specifically comprises the following steps:
and determining the protection triggering parameters of the low-frequency low-voltage load shedding protection system to be tested through preset data analysis software according to the output characteristic data.
3. The method for testing a low frequency and low voltage load shedding protection system according to claim 2, wherein the protection triggering parameters comprise a voltage set value, a frequency set value, a voltage slip set value and a frequency slip set value.
4. The method for testing the low-frequency low-voltage load shedding protection system according to claim 3, wherein when the target microgrid system does not have a voltage minimum threshold and a frequency minimum threshold, the failure due to overload is specifically caused to crash due to overload;
when the target microgrid system itself has the voltage minimum threshold and the frequency minimum threshold, the failure due to overload is particularly when the voltage of the target microgrid decreases to the voltage minimum threshold and/or the frequency decreases to the frequency minimum threshold;
when the target microgrid system has the voltage lowest threshold and the frequency lowest threshold, the voltage set value is the voltage lowest threshold, and the frequency set value is the frequency lowest threshold.
5. The method for testing the low-frequency low-voltage load shedding protection system according to claim 1, wherein after the low-frequency low-voltage load shedding protection system to be tested is tested according to the protection trigger parameter and a test result is obtained, the method for testing the low-frequency low-voltage load shedding protection system further comprises the following steps:
and controlling a prompter to prompt the test result.
6. The method for testing the low-frequency low-voltage load shedding protection system according to claim 2, wherein the obtaining of the output characteristic data of the power supply of the target microgrid system specifically comprises:
and acquiring output characteristic data of the power supply of the target micro-grid system through an oscilloscope or a digital multimeter.
7. The method for testing the low-frequency low-voltage load shedding protection system according to any one of claims 1 to 6, wherein the step of testing the low-frequency low-voltage load shedding protection system to be tested according to the protection trigger parameter and obtaining the test result comprises the following steps:
designing a test case according to the protection triggering parameters;
controlling the target micro-grid system according to the test case;
and obtaining a test result according to the protection state of the low-frequency low-voltage load shedding protection system to be tested in the target micro-grid system.
8. The method for testing the low-frequency low-voltage load shedding protection system according to claim 7, wherein the test case specifically comprises a forward test and at least one of a reverse test, an abnormal test and a daily simulation test;
the forward test is as follows:
simulating a load overload in the target microgrid;
under the overload condition, judging whether the low-frequency low-voltage load shedding protection system to be tested can act when the electric energy parameter of the target micro-grid reaches the protection trigger parameter;
if the target micro-grid system is not broken down, the low-frequency low-voltage load shedding protection system to be tested is qualified;
the reverse test is as follows:
simulating load shedding and loading actions in the target microgrid without exceeding the protection triggering parameters;
judging whether the low-frequency low-voltage load shedding protection system to be tested acts or not;
if not, the low-frequency low-voltage load shedding protection system to be tested is qualified;
the exception test is as follows:
simulating an abnormal state in the target microgrid;
judging whether the low-frequency low-voltage load shedding protection system to be tested acts or not;
if not, the low-frequency low-voltage load shedding protection system to be tested is qualified;
wherein the abnormal state comprises at least one of a communication failure, a power failure shutdown, a dual power source switch maintenance outage, and an impact load acceptable to the target microgrid system;
the daily simulation test is as follows:
controlling the target micro-grid to supply power for a preset time length for a preset type of load;
judging whether the low-frequency low-voltage load shedding protection system to be tested acts or not;
and if the low-frequency low-voltage load shedding protection system does not act, the low-frequency low-voltage load shedding protection system to be tested is qualified.
9. A testing device for a low-frequency low-voltage load-shedding protection system is characterized by comprising:
the acquisition module is used for acquiring output characteristic data when the target microgrid system fails due to overload;
the determining module is used for determining a protection triggering parameter of the low-frequency low-voltage load shedding protection system to be tested according to the output characteristic data;
and the test module is used for testing the low-frequency low-voltage load shedding protection system to be tested according to the protection trigger parameters and obtaining a test result.
10. A test device for a low frequency low voltage load shedding protection system, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the method for testing a low frequency and low voltage load shedding protection system according to any one of claims 1 to 8 when executing said computer program.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102062825A (en) * | 2010-09-15 | 2011-05-18 | 中国南方电网有限责任公司超高压输电公司 | Direct current protection test device and test method of direct current protector |
| CN102129001A (en) * | 2011-01-07 | 2011-07-20 | 山东大学 | Digital relay protection device testing system and method |
| CN102495374A (en) * | 2011-12-02 | 2012-06-13 | 深圳市晶福源电子技术有限公司 | Alternate-current current source for detecting internal resistant of cell in alternate current injection method and control method thereof |
| CN104391498A (en) * | 2014-10-22 | 2015-03-04 | 国家电网公司 | Non-intrusive testing system for relay protection device and testing method thereof |
| US9026260B1 (en) * | 2011-05-23 | 2015-05-05 | Shaw Intellectual Property Holdings, Inc. | Secure microgrid |
| CN105676143A (en) * | 2016-02-01 | 2016-06-15 | 哈尔滨工业大学 | Storage battery factory parameter online detection device |
| CN106050559A (en) * | 2016-06-20 | 2016-10-26 | 大唐（赤峰）新能源有限公司 | Detecting method and device for wind turbine generator overspeed protection system |
| CN110690710A (en) * | 2019-08-13 | 2020-01-14 | 杭州海兴电力科技股份有限公司 | Low-frequency low-voltage load shedding protection system in micro-grid environment |
-
2020
- 2020-06-12 CN CN202010538183.8A patent/CN111693811A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102062825A (en) * | 2010-09-15 | 2011-05-18 | 中国南方电网有限责任公司超高压输电公司 | Direct current protection test device and test method of direct current protector |
| CN102129001A (en) * | 2011-01-07 | 2011-07-20 | 山东大学 | Digital relay protection device testing system and method |
| US9026260B1 (en) * | 2011-05-23 | 2015-05-05 | Shaw Intellectual Property Holdings, Inc. | Secure microgrid |
| CN102495374A (en) * | 2011-12-02 | 2012-06-13 | 深圳市晶福源电子技术有限公司 | Alternate-current current source for detecting internal resistant of cell in alternate current injection method and control method thereof |
| CN104391498A (en) * | 2014-10-22 | 2015-03-04 | 国家电网公司 | Non-intrusive testing system for relay protection device and testing method thereof |
| CN105676143A (en) * | 2016-02-01 | 2016-06-15 | 哈尔滨工业大学 | Storage battery factory parameter online detection device |
| CN106050559A (en) * | 2016-06-20 | 2016-10-26 | 大唐（赤峰）新能源有限公司 | Detecting method and device for wind turbine generator overspeed protection system |
| CN110690710A (en) * | 2019-08-13 | 2020-01-14 | 杭州海兴电力科技股份有限公司 | Low-frequency low-voltage load shedding protection system in micro-grid environment |
Non-Patent Citations (1)
| Title |
|---|
| 崔梦天: "《软件测试技术与实践教程》", 中国科学技术大学出版社 * |
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