CN113839399A - New energy station high-frequency oscillation risk processing method and device - Google Patents
New energy station high-frequency oscillation risk processing method and device Download PDFInfo
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Abstract
The embodiment of the application provides a high-frequency oscillation risk processing method and device for a new energy station, and the method comprises the following steps: acquiring a three-phase voltage/current time domain signal of a set equipment node of a power grid to be tested and carrying out Fourier transform to obtain a three-phase voltage/current frequency domain signal and a corresponding harmonic component of the equipment node; judging whether the three-phase voltage/current frequency domain signal is a higher harmonic or not according to the harmonic component of the three-phase voltage/current frequency domain signal, if so, performing risk assessment according to a preset high-frequency oscillation risk assessment rule to obtain a risk assessment result; executing removal preprocessing operation and power grid stable operation judgment of preset station SVG equipment, and removing a corresponding collection line unit according to the power grid load of the power grid to be detected when the power grid stable operation judgment result is that the power grid is unstable in operation; the method and the device can accurately identify the new energy high-frequency oscillation risk and carry out accident pretreatment before high-frequency oscillation, and ensure production safety.
Description
Technical Field
The application relates to the technical field of new energy, in particular to a high-frequency oscillation risk processing method and device for a new energy station.
Background
A plurality of new problems different from the conventional power plant appear in the actual operation of the new energy power station, and the problems of high-frequency oscillation easily occur among equipment in the station due to numerous power electronic equipment of the new energy power station and complex control strategy. The high-frequency oscillation causes the equipment voltage to be rapidly increased, so that the equipment is disconnected from the network, and the problem of the high-frequency oscillation of the new energy station is solved.
The inventor finds that at present, after a unit is disconnected from a network, voltage and current waveforms in fault records in a new energy station are generally analyzed to obtain harmonic frequency, the obtained harmonic frequency is a fixed high-order frequency, and the harmonic wave of the fixed high-order frequency is controlled by a software algorithm to realize the adaptability of the power grid. However, higher harmonics in the power grid may change according to the operation condition of the new energy station equipment and the characteristic condition of the power grid, and harmonics of other higher frequencies may cause the converter to be disconnected due to non-recognition and non-control, which may cause great damage to the operation of the new energy station.
Disclosure of Invention
Aiming at the problems in the prior art, the application provides a new energy station high-frequency oscillation risk processing method and device, which can accurately identify the new energy high-frequency oscillation risk and carry out accident pretreatment before high-frequency oscillation, so that the production safety is guaranteed.
In order to solve at least one of the above problems, the present application provides the following technical solutions:
in a first aspect, the present application provides a new energy station high-frequency oscillation risk processing method, including:
acquiring a three-phase voltage/current time domain signal of a set equipment node of a power grid to be tested and carrying out Fourier transform to obtain a three-phase voltage/current frequency domain signal and a corresponding harmonic component of the equipment node;
judging whether the three-phase voltage/current frequency domain signal is a higher harmonic or not according to the harmonic component of the three-phase voltage/current frequency domain signal, if so, performing risk assessment according to a preset high-frequency oscillation risk assessment rule to obtain a risk assessment result;
and after the risk evaluation result is judged to be that the high-frequency oscillation risk exists, executing the cutting preprocessing operation of the SVG equipment of the preset station and the stable operation judgment of the power grid, and cutting the corresponding collection line unit according to the power grid load of the power grid to be detected when the stable operation judgment result of the power grid is that the power grid is unstable.
Further, the determining whether the three-phase voltage/current frequency domain signal is a higher harmonic according to the harmonic component of the three-phase voltage/current frequency domain signal includes:
and judging whether the harmonic content of the voltage/current frequency domain signal of any one phase or any two phases in the three-phase voltage/current frequency domain signals exceeds a preset threshold value and the voltage amplitude exceeds a preset multiple of the low voltage locking value of the equipment, if so, judging that the three-phase voltage/current frequency domain signals are higher harmonics.
Further, the performing risk assessment according to a preset high-frequency oscillation risk assessment rule to obtain a risk assessment result includes:
and judging whether the ratio value of the voltage amplitude value of any one phase of the voltage/current frequency domain signals of the three-phase voltage/current frequency domain signals in a set time period to the voltage amplitude value at a set moment exceeds a preset ratio threshold value or not, and if so, judging that the high-frequency oscillation risk exists.
Further, the executing of the power grid stable operation judgment includes:
after the preset station SVG device is executed to remove the preprocessing operation, whether the voltage amplitude of any phase in the three-phase voltage/current frequency domain signal is smaller than a first preset voltage amplitude threshold value and whether the sum of the voltage amplitudes of any two phases is a second preset voltage amplitude threshold value is judged, if yes, the power grid is judged to be stably operated, and if not, the power grid is judged to be unstable in operation.
In a second aspect, the present application provides a new energy station high-frequency oscillation risk processing apparatus, including:
the harmonic component determination module is used for acquiring a three-phase voltage/current time domain signal of a to-be-detected power grid setting equipment node and performing Fourier transform to obtain a three-phase voltage/current frequency domain signal of the equipment node and a corresponding harmonic component;
the risk evaluation module is used for judging whether the three-phase voltage/current frequency domain signal is a higher harmonic or not according to the harmonic component of the three-phase voltage/current frequency domain signal, and if so, performing risk evaluation according to a preset high-frequency oscillation risk evaluation rule to obtain a risk evaluation result;
and the risk preprocessing module is used for executing the preprocessing operation of cutting off the preset station SVG equipment and the judgment of stable operation of the power grid after judging that the risk evaluation result shows that the high-frequency oscillation risk exists, and cutting off the corresponding collection line unit according to the power grid load of the power grid to be detected when the judgment result of the stable operation of the power grid shows that the power grid is unstable.
Further, the risk assessment module comprises:
and the higher harmonic determining unit is used for judging whether the harmonic content of any one phase or any two phases of voltage/current frequency domain signals in the three-phase voltage/current frequency domain signals exceeds a preset threshold value and the voltage amplitude exceeds a preset multiple of the low-voltage locking value of the equipment, and if so, judging that the three-phase voltage/current frequency domain signals are higher harmonics.
Further, the risk assessment module comprises:
and the high-frequency oscillation risk determining unit is used for judging whether the ratio value of the voltage amplitude when the voltage/current frequency domain signal of any one phase in the three-phase voltage/current frequency domain signals is a higher harmonic within a set time period and the voltage amplitude at a set moment exceeds a preset ratio threshold value, and if so, judging that the high-frequency oscillation risk exists.
Further, the risk pre-processing module comprises:
and the power grid stability determining unit is used for judging whether the voltage amplitude of any phase in the three-phase voltage/current frequency domain signal is smaller than a first preset voltage amplitude threshold value and whether the sum of the voltage amplitudes of any two phases is a second preset voltage amplitude threshold value after executing the cutting preprocessing operation of the preset field station SVG equipment, if so, judging that the power grid operates stably, and otherwise, judging that the power grid operates unstably.
In a third aspect, the present application provides an electronic 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 new energy station high frequency oscillation risk processing method when executing the program.
In a fourth aspect, the present application provides a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the steps of the new energy station high-frequency oscillation risk processing method.
According to the technical scheme, the high-frequency oscillation risk processing method and device for the new energy station are characterized in that the high-frequency oscillation risk is evaluated by identifying the high-order harmonics in the three-phase voltage/current time domain signals of the equipment nodes of the power grid to be tested, and after the risk evaluation result indicates that the high-frequency oscillation risk exists, the preset high-frequency oscillation risk preprocessing operation is executed, so that the high-frequency oscillation risk of the new energy station is prevented from appearing and deteriorating, the accident preprocessing before the high-frequency oscillation is realized, the high-frequency oscillation risk of the new energy station can be accurately identified, the accident preprocessing before the high-frequency oscillation is carried out, and the production safety is guaranteed.
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In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flow chart of a new energy station high-frequency oscillation risk processing method in an embodiment of the present application;
fig. 2 is one of the structural diagrams of the high-frequency oscillation risk processing apparatus of the new energy station in the embodiment of the present application;
fig. 3 is a second structural diagram of the high-frequency oscillation risk processing apparatus of the new energy station in the embodiment of the present application;
fig. 4 is a third structural diagram of a high-frequency oscillation risk processing apparatus of a new energy station in an embodiment of the present application;
fig. 5 is a fourth structural diagram of a high-frequency oscillation risk processing apparatus of a new energy station in an embodiment of the present application;
fig. 6 is a schematic structural diagram of an electronic device in an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In consideration of the fact that the harmonic waves of the power grid are identified in the prior art, generally, after a unit is disconnected, voltage and current waveforms in fault records in a new energy station are analyzed to obtain harmonic frequencies, the obtained harmonic frequencies are fixed high-order frequencies, and the harmonic waves of the fixed high-order frequencies are controlled by a software algorithm to achieve power grid adaptability. However, higher harmonics in the power grid can change according to the running condition of new energy station equipment and the characteristic condition of the power grid, and harmonics of other higher frequencies can cause the disconnection of a converter due to non-recognition and control, thereby causing great harm to the running of a new energy station, the application provides a high-frequency oscillation risk processing method and a device of the new energy station, which can perform high-frequency oscillation risk evaluation by recognizing the higher harmonics in three-phase voltage/current time domain signals of a set equipment node of the power grid to be tested, and perform preset high-frequency oscillation risk preprocessing operation after the risk evaluation result shows that the high-frequency oscillation risk exists, thereby preventing the high-frequency oscillation risk of the new energy station from appearing and deteriorating, realizing accident preprocessing before high-frequency oscillation, and therefore, accurately recognizing the high-frequency oscillation risk of the new energy station and performing accident preprocessing before high-frequency oscillation, the production safety is guaranteed.
In order to accurately identify the new energy high-frequency oscillation risk, pre-process the accident before the high-frequency oscillation and guarantee the production safety, the application provides an embodiment of a new energy station high-frequency oscillation risk processing method, and referring to fig. 1, the new energy station high-frequency oscillation risk processing method specifically includes the following contents:
step S101: the method comprises the steps of collecting three-phase voltage/current time domain signals of a power grid setting equipment node to be measured and carrying out Fourier transform to obtain three-phase voltage/current frequency domain signals and corresponding harmonic components of the equipment node.
Optionally, the setting device nodes when the three-phase voltage/current time domain signals of the power grid setting device node to be measured are collected include but are not limited to: the main high/low voltage side, the SVG, the bus and the new energy unit collecting line node.
Optionally, after acquiring the three-phase voltage/current time-domain signal, the method may calculate the three-phase voltage/current frequency-domain signal of the node according to a preset existing fourier transform (FFT) algorithm, and then obtain a harmonic component of the node, including: the frequency (h) of each harmonic component of the three-phase voltage/current, the amplitude (Uh, square root value of harmonic voltage signal) under the harmonic component and the harmonic content (HR).
Step S102: and judging whether the three-phase voltage/current frequency domain signal is a higher harmonic or not according to the harmonic component of the three-phase voltage/current frequency domain signal, if so, performing risk assessment according to a preset high-frequency oscillation risk assessment rule to obtain a risk assessment result.
Optionally, this application can be based on the harmonic component of three-phase voltage/electric current frequency domain signal and the numerical value comparison of predetermineeing the threshold value, judge whether three-phase voltage/electric current frequency domain signal is the higher harmonic, wherein, the higher harmonic can cause higher order oscillation risk.
Optionally, after it is determined that there is a higher harmonic that can cause a higher oscillation risk through the above description, the present application may further perform a high frequency oscillation risk evaluation on the higher harmonic in combination with the occurrence time of the higher harmonic, so as to obtain a risk evaluation result.
Step S103: and after the risk evaluation result is judged to be that the high-frequency oscillation risk exists, executing the cutting preprocessing operation of the SVG equipment of the preset station and the stable operation judgment of the power grid, and cutting the corresponding collection line unit according to the power grid load of the power grid to be detected when the stable operation judgment result of the power grid is that the power grid is unstable.
Optionally, judge risk assessment result is for having the high frequency oscillation risk after, this application can carry out the excision of station SVG equipment in the instant beginning preliminary treatment to after excision SVG equipment, carry out the judgement of electric wire netting steady operation, if the result that electric wire netting steady operation was judged is electric wire netting operation unstability, then still need carry out selective excision and collect the line unit and go on, and it judges according to the load condition specifically to select which to collect the line. If the power grid is judged to be stable through stable operation of the power grid, investment judgment can be carried out after SVG capacity and control strategy optimization are adjusted, and the preprocessing process can be completed after SVG stable investment is realized.
As can be seen from the above description, the high-frequency oscillation risk processing method for the new energy station provided in the embodiment of the present application can perform high-frequency oscillation risk evaluation by identifying higher harmonics in three-phase voltage/current time domain signals of the device node of the power grid to be measured, and perform preset high-frequency oscillation risk preprocessing operation after the risk evaluation result indicates that a high-frequency oscillation risk exists, so as to prevent the occurrence and deterioration of the high-frequency oscillation risk of the new energy station, and implement accident preprocessing before high-frequency oscillation, thereby accurately identifying the high-frequency oscillation risk of the new energy station and performing accident preprocessing before high-frequency oscillation, and ensuring production safety.
In order to accurately identify the higher harmonics in the three-phase voltage/current frequency domain signal, in an embodiment of the method for processing a high-frequency oscillation risk of a new energy station, the step S102 may further include the following steps:
and judging whether the harmonic content of the voltage/current frequency domain signal of any one phase or any two phases in the three-phase voltage/current frequency domain signals exceeds a preset threshold value and the voltage amplitude exceeds a preset multiple of the low voltage locking value of the equipment, if so, judging that the three-phase voltage/current frequency domain signals are higher harmonics.
In a specific embodiment, the harmonic voltage/current content (HR) of a certain phase or any two phases of the three-phase voltage/current frequency domain signal is greater than or equal to a preset threshold and the amplitude (U) of the harmonic voltagehHarmonic voltage signal root mean square value) greater than 90% times the low voltage lockout value (U) of the devicep) The method can be used for carrying out high-frequency oscillation risk assessment by starting a designed auxiliary algorithm criterion, wherein the preset threshold is determined according to an empirical value of the harmonic content of the high-frequency resonance accident of the new energy station and the requirement of power quality specification, the preset threshold of a certain phase can be 10%, and the preset threshold of any two phases can be 15%.
In order to accurately perform the high-frequency oscillation risk assessment, in an embodiment of the new energy station high-frequency oscillation risk processing method of the present application, the step S102 may further specifically include the following steps:
and judging whether the ratio value of the voltage amplitude value of any one phase of the voltage/current frequency domain signals of the three-phase voltage/current frequency domain signals in a set time period to the voltage amplitude value at a set moment exceeds a preset ratio threshold value or not, and if so, judging that the high-frequency oscillation risk exists.
In an embodiment, the present application may determine whether a ratio between a voltage amplitude of any one of the three-phase voltage/current frequency domain signals when the voltage/current frequency domain signal is a higher harmonic within a set time period and a voltage amplitude at a set time exceeds a preset ratio threshold, for example, after a time Δ t, U is greater than a preset ratio thresholdh(t+Δt)/Uh(t) is ≧ δ, where Uh(t) is the amplitude of higher harmonics of any three-phase voltage with higher oscillation risk at the moment t when the preset threshold algorithm criterion is started at the moment t, and Uh(t + Δ t) means that after the preset threshold algorithm criterion is started at the time t, the amplitude of the higher harmonic of the three-phase voltage at the time t + Δ t has higher oscillation risk, the value of the preset occupation threshold value δ is determined according to the field station operation condition and the higher harmonic development rule, and the value of δ can be 1.045 in the application.
In order to ensure that the power grid stably operates when the high-frequency oscillation risk occurs, in an embodiment of the new energy station high-frequency oscillation risk processing method of the present application, the step S103 may further specifically include the following:
after the preset station SVG device is executed to remove the preprocessing operation, whether the voltage amplitude of any phase in the three-phase voltage/current frequency domain signal is smaller than a first preset voltage amplitude threshold value and whether the sum of the voltage amplitudes of any two phases is a second preset voltage amplitude threshold value is judged, if yes, the power grid is judged to be stably operated, and if not, the power grid is judged to be unstable in operation.
In a specific embodiment, after the SVG device is removed, the method can perform a criterion for stable operation of the power grid, specifically: "cutting off SVG device t0Through Δ t0And time, the harmonic voltage HR of any one of the three phases of the 35 kilovolt bus is less than or equal to 7 percent, the sum of the HR values of any two phases of the harmonic voltages is less than 10 percent, the criterion can be started and quitted, the power grid stable operation criterion is started, and the high-frequency oscillation risk does not exist in the new energy station. Generally, get,. DELTA.t0The method is determined according to the action time of the station protection equipment and the standard time of the power grid fault.
And if the power grid stable operation criterion is started to fail, selectively cutting off the collection line units, and specifically selecting which collection line to judge according to the load condition. If the power grid stable operation criterion is started successfully, the input judgment is carried out after SVG capacity adjustment and control strategy optimization, and the preprocessing process can be completed after SVG stable input is realized.
In order to accurately identify the new energy high-frequency oscillation risk, perform pre-treatment on the accident before high-frequency oscillation, and guarantee production safety, the application provides an embodiment of a new energy station high-frequency oscillation risk processing apparatus for implementing all or part of the new energy station high-frequency oscillation risk processing method, and referring to fig. 2, the new energy station high-frequency oscillation risk processing apparatus specifically includes the following contents:
the harmonic component determination module 10 is configured to acquire a three-phase voltage/current time domain signal of a power grid setting device node to be detected and perform fourier transform, so as to obtain a three-phase voltage/current frequency domain signal of the device node and a corresponding harmonic component.
And the risk evaluation module 20 is configured to determine whether the three-phase voltage/current frequency domain signal is a higher harmonic according to the harmonic component of the three-phase voltage/current frequency domain signal, and if so, perform risk evaluation according to a preset high-frequency oscillation risk evaluation rule to obtain a risk evaluation result.
And the risk preprocessing module 30 is used for executing the preprocessing operation of cutting off the preset station SVG equipment and the judgment of stable operation of the power grid after judging that the risk evaluation result is that the high-frequency oscillation risk exists, and cutting off the corresponding collection line unit according to the power grid load of the power grid to be detected when the judgment result of the stable operation of the power grid is that the power grid is unstable.
According to the high-frequency oscillation risk processing device for the new energy station, provided by the embodiment of the application, high-frequency oscillation risk evaluation can be performed by identifying high-order harmonics in three-phase voltage/current time domain signals of the to-be-measured power grid setting equipment nodes, and after the risk evaluation result indicates that high-frequency oscillation risk exists, preset high-frequency oscillation risk preprocessing operation is executed, the high-frequency oscillation risk of the new energy station is prevented from appearing and deteriorating, accident preprocessing before high-frequency oscillation is realized, therefore, the high-frequency oscillation risk of the new energy station can be accurately identified, accident preprocessing before high-frequency oscillation is performed, and production safety is guaranteed.
In order to accurately identify the higher harmonics in the three-phase voltage/current frequency domain signal, in an embodiment of the new energy station high-frequency oscillation risk processing apparatus of the present application, referring to fig. 3, the risk assessment module 20 includes:
and the higher harmonic determining unit 21 is configured to determine whether the harmonic content of any one or two of the three-phase voltage/current frequency domain signals exceeds a preset threshold and the voltage amplitude exceeds a preset multiple of the low-voltage lockout value of the device, and if so, determine that the three-phase voltage/current frequency domain signals are higher harmonics.
In order to accurately perform the risk assessment of the high-frequency oscillation, in an embodiment of the high-frequency oscillation risk processing apparatus of the new energy station of the present application, referring to fig. 4, the risk assessment module 20 includes:
and a high-frequency oscillation risk determining unit 22, configured to determine whether a ratio value between a voltage amplitude when the voltage/current frequency domain signal of any one of the three-phase voltage/current frequency domain signals is a higher harmonic within a set time period and a voltage amplitude at a set time exceeds a preset ratio threshold, and if so, determine that a high-frequency oscillation risk exists.
In order to ensure stable operation of the power grid when the high-frequency oscillation risk occurs, in an embodiment of the new energy station high-frequency oscillation risk processing apparatus of the present application, referring to fig. 5, the risk preprocessing module 30 includes:
and the power grid stability determining unit 31 is configured to determine whether a voltage amplitude of any one phase in the three-phase voltage/current frequency domain signal is smaller than a first preset voltage amplitude threshold and whether a sum of voltage amplitudes of any two phases is a second preset voltage amplitude threshold after performing a preset station SVG device removal preprocessing operation, determine that the power grid operates stably if the voltage amplitude of any one phase is smaller than the first preset voltage amplitude threshold, and determine that the power grid operates unstably if the voltage amplitude of any two phases is not smaller than the second preset voltage amplitude threshold.
In order to further explain the scheme, the present application further provides a specific application example of implementing the new energy station high-frequency oscillation risk processing method by using the new energy station high-frequency oscillation risk processing apparatus, which specifically includes the following contents:
step 1 is as follows: acquiring three-phase voltage/current time domain signals of key equipment nodes of a power grid to be detected through acquisition, calculating three-phase voltage/current frequency domain signals according to a Fast Fourier Transform (FFT) algorithm, and then obtaining the times (h) of each harmonic component of the three-phase voltage/current and the amplitude (U) under the harmonic componenthHarmonic voltage signal root mean square value) and harmonic content (HR), if a certain harmonic of the harmonic signal meets a preset threshold criterion, starting a designed auxiliary algorithm criterion to confirm the high-frequency oscillation risk, and recognizing the high-frequency oscillation risk of the new energy.
Step 2: certain harmonic of the harmonic signal provided by the application meets the criterion: "content ratio of a certain phase or any two phases (HR)Greater than or equal to a predetermined threshold and harmonic amplitude (U)hHarmonic voltage signal root mean square value) greater than 90% times the low voltage lockout value (U) of the devicep) And starting the designed auxiliary algorithm criterion to evaluate the high-frequency oscillation risk ".
And step 3: certain harmonics of the harmonic signal satisfy the criterion: "the content rate (HR) of a certain phase or any two phases is greater than or equal to a preset threshold value and the amplitude of harmonic waves (U)hHarmonic voltage signal root mean square value) greater than 90% times the low voltage lockout value (U) of the devicep) And starting a designed auxiliary algorithm criterion to evaluate the high-frequency oscillation risk, wherein the preset threshold is determined according to an empirical value of the harmonic content of the high-frequency resonance accident of the new energy station and the requirement of a power quality specification, the preset threshold of a certain phase is 10%, and the preset threshold of any two phases is 15%.
And 4, step 4: after the preset threshold algorithm criterion is started, the high-frequency oscillation risk evaluation needs to be carried out through an auxiliary algorithm criterion, wherein the specific criterion is as follows: ' after the preset threshold algorithm criterion is started and after delta t time, Uh(t+Δt)/Uh(t) ≧ δ ", where Uh(t) is the amplitude of higher harmonics of any three-phase voltage with higher oscillation risk at the moment t when the preset threshold algorithm criterion is started at the moment t, and Uh(t + delta t) refers to the amplitude of the higher harmonic wave of any three-phase voltage with higher oscillation risk at the time t + delta t after the preset threshold algorithm criterion is started at the time t, and the value of delta is determined according to the station operation condition and the higher harmonic wave development rule.
And 5: the specific criterion is as follows: ' after the preset threshold algorithm criterion is started and after delta t time, Uh
(t+Δt)/Uh(t) ≧ δ ", where Uh(t) is the amplitude of higher harmonics of any three-phase voltage with higher oscillation risk at the moment t when the preset threshold algorithm criterion is started at the moment t, and Uh(t + delta t) refers to the amplitude of the higher harmonic wave of any three-phase voltage with higher oscillation risk at the time t + delta t after the preset threshold algorithm criterion is started at the time t, and the value of delta is determined according to the station operation condition and the higher harmonic wave development rule. In this applicationDelta is 1.045.
And 5: the application provides a new energy high-frequency oscillation risk preprocessing method, which comprises the following steps: and immediately starting to perform the removal pretreatment of the SVG equipment of the station after meeting the criterion of starting the preset threshold algorithm and the criterion of the auxiliary algorithm. And if the SVG equipment is cut off, judging the stable operation of the power grid.
Step 6: and if the SVG equipment is cut off, judging the stable operation of the power grid. Specifically, the method comprises the following steps: "cutting off SVG device t0Through Δ t0And time, the harmonic voltage HR of any one of the three phases of the 35 kilovolt bus is less than or equal to 7 percent, and the sum of the harmonic voltage HR values of any two phases is less than 10 percent, so that the criterion exiting can be started.
And 7: and starting the power grid stable operation criterion, namely, explaining that the new energy station has no high-frequency oscillation risk at the moment. Generally, get,. DELTA.t0The method is determined according to the action time of the station protection equipment and the standard time of the power grid fault.
And 8: and if the power grid stable operation criterion is started to fail, selectively cutting off the collection line units, and specifically selecting which collection line to judge according to the load condition. If the power grid stable operation criterion is started successfully, the input judgment is carried out after SVG capacity adjustment and control strategy optimization, and the preprocessing process can be completed after SVG stable input is realized.
According to the method, after the condition that the high-frequency oscillation risk exists is confirmed, the risk pretreatment criterion is started, the high-frequency oscillation risk pretreatment is carried out, the high-frequency oscillation risk of the new energy station is prevented from appearing and deteriorating, and the accident pretreatment before the high-frequency oscillation is realized.
In order to accurately identify the new energy high-frequency oscillation risk, pre-process the high-frequency oscillation pre-accident and ensure the production safety, the application provides an embodiment of an electronic device for implementing all or part of the new energy station high-frequency oscillation risk processing method, where the electronic device specifically includes the following contents:
a processor (processor), a memory (memory), a communication Interface (Communications Interface), and a bus; the processor, the memory and the communication interface complete mutual communication through the bus; the communication interface is used for realizing information transmission between the new energy station high-frequency oscillation risk processing device and relevant equipment such as a core service system, a user terminal and a relevant database; the logic controller may be a desktop computer, a tablet computer, a mobile terminal, and the like, but the embodiment is not limited thereto. In this embodiment, the logic controller may be implemented with reference to the embodiment of the new energy station high-frequency oscillation risk processing method and the embodiment of the new energy station high-frequency oscillation risk processing apparatus in the embodiment, and the contents thereof are incorporated herein, and repeated details are not repeated.
It is understood that the user terminal may include a smart phone, a tablet electronic device, a network set-top box, a portable computer, a desktop computer, a Personal Digital Assistant (PDA), an in-vehicle device, a smart wearable device, and the like. Wherein, intelligence wearing equipment can include intelligent glasses, intelligent wrist-watch, intelligent bracelet etc..
In practical applications, part of the new energy station high-frequency oscillation risk processing method may be performed on the electronic device side as described above, or all operations may be performed in the client device. The selection may be specifically performed according to the processing capability of the client device, the limitation of the user usage scenario, and the like. This is not a limitation of the present application. The client device may further include a processor if all operations are performed in the client device.
The client device may have a communication module (i.e., a communication unit), and may be communicatively connected to a remote server to implement data transmission with the server. The server may include a server on the task scheduling center side, and in other implementation scenarios, the server may also include a server on an intermediate platform, for example, a server on a third-party server platform that is communicatively linked to the task scheduling center server. The server may include a single computer device, or may include a server cluster formed by a plurality of servers, or a server structure of a distributed apparatus.
Fig. 6 is a schematic block diagram of a system configuration of an electronic device 9600 according to an embodiment of the present application. As shown in fig. 6, the electronic device 9600 can include a central processor 9100 and a memory 9140; the memory 9140 is coupled to the central processor 9100. Notably, this FIG. 6 is exemplary; other types of structures may also be used in addition to or in place of the structure to implement telecommunications or other functions.
In one embodiment, the function of the new energy station high-frequency oscillation risk processing method may be integrated into the central processing unit 9100. The central processor 9100 may be configured to control as follows:
step S101: the method comprises the steps of collecting three-phase voltage/current time domain signals of a power grid setting equipment node to be measured and carrying out Fourier transform to obtain three-phase voltage/current frequency domain signals and corresponding harmonic components of the equipment node.
Step S102: and judging whether the three-phase voltage/current frequency domain signal is a higher harmonic or not according to the harmonic component of the three-phase voltage/current frequency domain signal, if so, performing risk assessment according to a preset high-frequency oscillation risk assessment rule to obtain a risk assessment result.
Step S103: and after the risk evaluation result is judged to be that the high-frequency oscillation risk exists, executing the cutting preprocessing operation of the SVG equipment of the preset station and the stable operation judgment of the power grid, and cutting the corresponding collection line unit according to the power grid load of the power grid to be detected when the stable operation judgment result of the power grid is that the power grid is unstable.
As can be seen from the above description, according to the electronic device provided in the embodiment of the present application, the high-frequency oscillation risk assessment is performed by identifying the higher harmonics in the three-phase voltage/current time domain signal of the device node of the power grid to be measured, and after the risk assessment result indicates that the high-frequency oscillation risk exists, the preset high-frequency oscillation risk preprocessing operation is performed, so that the occurrence and the deterioration of the high-frequency oscillation risk of the new energy station are prevented, the accident preprocessing before the high-frequency oscillation is realized, and therefore, the high-frequency oscillation risk of the new energy can be accurately identified, the accident preprocessing before the high-frequency oscillation is performed, and the production safety is guaranteed.
In another embodiment, the new energy station high-frequency oscillation risk processing apparatus may be configured separately from the central processing unit 9100, for example, the new energy station high-frequency oscillation risk processing apparatus may be configured as a chip connected to the central processing unit 9100, and the function of the new energy station high-frequency oscillation risk processing method may be implemented by the control of the central processing unit.
As shown in fig. 6, the electronic device 9600 may further include: a communication module 9110, an input unit 9120, an audio processor 9130, a display 9160, and a power supply 9170. It is noted that the electronic device 9600 also does not necessarily include all of the components shown in fig. 6; further, the electronic device 9600 may further include components not shown in fig. 6, which may be referred to in the art.
As shown in fig. 6, a central processor 9100, sometimes referred to as a controller or operational control, can include a microprocessor or other processor device and/or logic device, which central processor 9100 receives input and controls the operation of the various components of the electronic device 9600.
The memory 9140 can be, for example, one or more of a buffer, a flash memory, a hard drive, a removable media, a volatile memory, a non-volatile memory, or other suitable device. The information relating to the failure may be stored, and a program for executing the information may be stored. And the central processing unit 9100 can execute the program stored in the memory 9140 to realize information storage or processing, or the like.
The input unit 9120 provides input to the central processor 9100. The input unit 9120 is, for example, a key or a touch input device. Power supply 9170 is used to provide power to electronic device 9600. The display 9160 is used for displaying display objects such as images and characters. The display may be, for example, an LCD display, but is not limited thereto.
The memory 9140 can be a solid state memory, e.g., Read Only Memory (ROM), Random Access Memory (RAM), a SIM card, or the like. There may also be a memory that holds information even when power is off, can be selectively erased, and is provided with more data, an example of which is sometimes called an EPROM or the like. The memory 9140 could also be some other type of device. Memory 9140 includes a buffer memory 9141 (sometimes referred to as a buffer). The memory 9140 may include an application/function storage portion 9142, the application/function storage portion 9142 being used for storing application programs and function programs or for executing a flow of operations of the electronic device 9600 by the central processor 9100.
The memory 9140 can also include a data store 9143, the data store 9143 being used to store data, such as contacts, digital data, pictures, sounds, and/or any other data used by an electronic device. The driver storage portion 9144 of the memory 9140 may include various drivers for the electronic device for communication functions and/or for performing other functions of the electronic device (e.g., messaging applications, contact book applications, etc.).
The communication module 9110 is a transmitter/receiver 9110 that transmits and receives signals via an antenna 9111. The communication module (transmitter/receiver) 9110 is coupled to the central processor 9100 to provide input signals and receive output signals, which may be the same as in the case of a conventional mobile communication terminal.
Based on different communication technologies, a plurality of communication modules 9110, such as a cellular network module, a bluetooth module, and/or a wireless local area network module, may be provided in the same electronic device. The communication module (transmitter/receiver) 9110 is also coupled to a speaker 9131 and a microphone 9132 via an audio processor 9130 to provide audio output via the speaker 9131 and receive audio input from the microphone 9132, thereby implementing ordinary telecommunications functions. The audio processor 9130 may include any suitable buffers, decoders, amplifiers and so forth. In addition, the audio processor 9130 is also coupled to the central processor 9100, thereby enabling recording locally through the microphone 9132 and enabling locally stored sounds to be played through the speaker 9131.
An embodiment of the present application further provides a computer-readable storage medium capable of implementing all the steps in the new energy station high-frequency oscillation risk processing method with the execution subject being the server or the client in the foregoing embodiment, where the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the computer program implements all the steps in the new energy station high-frequency oscillation risk processing method with the execution subject being the server or the client in the foregoing embodiment, for example, when the processor executes the computer program, the processor implements the following steps:
step S101: the method comprises the steps of collecting three-phase voltage/current time domain signals of a power grid setting equipment node to be measured and carrying out Fourier transform to obtain three-phase voltage/current frequency domain signals and corresponding harmonic components of the equipment node.
Step S102: and judging whether the three-phase voltage/current frequency domain signal is a higher harmonic or not according to the harmonic component of the three-phase voltage/current frequency domain signal, if so, performing risk assessment according to a preset high-frequency oscillation risk assessment rule to obtain a risk assessment result.
Step S103: and after the risk evaluation result is judged to be that the high-frequency oscillation risk exists, executing the cutting preprocessing operation of the SVG equipment of the preset station and the stable operation judgment of the power grid, and cutting the corresponding collection line unit according to the power grid load of the power grid to be detected when the stable operation judgment result of the power grid is that the power grid is unstable.
As can be seen from the above description, according to the computer-readable storage medium provided in the embodiment of the present application, by identifying the higher harmonics in the three-phase voltage/current time domain signal of the power grid setting device node to be tested, the high-frequency oscillation risk assessment is performed on the power grid setting device node, and after the risk assessment result indicates that the high-frequency oscillation risk exists, a preset high-frequency oscillation risk preprocessing operation is performed, so that the occurrence and the deterioration of the high-frequency oscillation risk of the new energy station are prevented, and pre-high-frequency oscillation accident preprocessing is performed, so that the high-frequency oscillation risk of the new energy station can be accurately identified, and pre-high-frequency oscillation accident preprocessing is performed, and the production safety is guaranteed.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (devices), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A high-frequency oscillation risk processing method for a new energy station is characterized by comprising the following steps:
acquiring a three-phase voltage/current time domain signal of a set equipment node of a power grid to be tested and carrying out Fourier transform to obtain a three-phase voltage/current frequency domain signal and a corresponding harmonic component of the equipment node;
judging whether the three-phase voltage/current frequency domain signal is a higher harmonic or not according to the harmonic component of the three-phase voltage/current frequency domain signal, if so, performing risk assessment according to a preset high-frequency oscillation risk assessment rule to obtain a risk assessment result;
and after the risk evaluation result is judged to be that the high-frequency oscillation risk exists, executing the cutting preprocessing operation of the SVG equipment of the preset station and the stable operation judgment of the power grid, and cutting the corresponding collection line unit according to the power grid load of the power grid to be detected when the stable operation judgment result of the power grid is that the power grid is unstable.
2. The method for processing high-frequency oscillation risk of the new energy station according to claim 1, wherein the step of judging whether the three-phase voltage/current frequency domain signal is a higher harmonic according to the harmonic component of the three-phase voltage/current frequency domain signal comprises the following steps:
and judging whether the harmonic content of the voltage/current frequency domain signal of any one phase or any two phases in the three-phase voltage/current frequency domain signals exceeds a preset threshold value and the voltage amplitude exceeds a preset multiple of the low voltage locking value of the equipment, if so, judging that the three-phase voltage/current frequency domain signals are higher harmonics.
3. The high-frequency oscillation risk processing method for the new energy station according to claim 1, wherein the risk assessment is performed according to a preset high-frequency oscillation risk assessment rule to obtain a risk assessment result, and the method comprises the following steps:
and judging whether the ratio value of the voltage amplitude value of any one phase of the voltage/current frequency domain signals of the three-phase voltage/current frequency domain signals in a set time period to the voltage amplitude value at a set moment exceeds a preset ratio threshold value or not, and if so, judging that the high-frequency oscillation risk exists.
4. The method for processing high-frequency oscillation risk of the new energy station according to claim 1, wherein the performing of the power grid stable operation judgment comprises:
after the preset station SVG device is executed to remove the preprocessing operation, whether the voltage amplitude of any phase in the three-phase voltage/current frequency domain signal is smaller than a first preset voltage amplitude threshold value and whether the sum of the voltage amplitudes of any two phases is a second preset voltage amplitude threshold value is judged, if yes, the power grid is judged to be stably operated, and if not, the power grid is judged to be unstable in operation.
5. A high-frequency oscillation risk processing device of a new energy station is characterized by comprising:
the harmonic component determination module is used for acquiring a three-phase voltage/current time domain signal of a to-be-detected power grid setting equipment node and performing Fourier transform to obtain a three-phase voltage/current frequency domain signal of the equipment node and a corresponding harmonic component;
the risk evaluation module is used for judging whether the three-phase voltage/current frequency domain signal is a higher harmonic or not according to the harmonic component of the three-phase voltage/current frequency domain signal, and if so, performing risk evaluation according to a preset high-frequency oscillation risk evaluation rule to obtain a risk evaluation result;
and the risk preprocessing module is used for executing the preprocessing operation of cutting off the preset station SVG equipment and the judgment of stable operation of the power grid after judging that the risk evaluation result shows that the high-frequency oscillation risk exists, and cutting off the corresponding collection line unit according to the power grid load of the power grid to be detected when the judgment result of the stable operation of the power grid shows that the power grid is unstable.
6. The high-frequency oscillation risk processing device of the new energy station as claimed in claim 5, wherein the risk assessment module comprises:
and the higher harmonic determining unit is used for judging whether the harmonic content of any one phase or any two phases of voltage/current frequency domain signals in the three-phase voltage/current frequency domain signals exceeds a preset threshold value and the voltage amplitude exceeds a preset multiple of the low-voltage locking value of the equipment, and if so, judging that the three-phase voltage/current frequency domain signals are higher harmonics.
7. The high-frequency oscillation risk processing device of the new energy station as claimed in claim 5, wherein the risk assessment module comprises:
and the high-frequency oscillation risk determining unit is used for judging whether the ratio value of the voltage amplitude when the voltage/current frequency domain signal of any one phase in the three-phase voltage/current frequency domain signals is a higher harmonic within a set time period and the voltage amplitude at a set moment exceeds a preset ratio threshold value, and if so, judging that the high-frequency oscillation risk exists.
8. The high-frequency oscillation risk processing device of the new energy station as claimed in claim 5, wherein the risk preprocessing module comprises:
and the power grid stability determining unit is used for judging whether the voltage amplitude of any phase in the three-phase voltage/current frequency domain signal is smaller than a first preset voltage amplitude threshold value and whether the sum of the voltage amplitudes of any two phases is a second preset voltage amplitude threshold value after executing the cutting preprocessing operation of the preset field station SVG equipment, if so, judging that the power grid operates stably, and otherwise, judging that the power grid operates unstably.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of the method for handling risk of high frequency oscillations of a new energy farm according to any one of claims 1 to 4 when executing the program.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the new energy station high-frequency oscillation risk processing method of any one of claims 1 to 4.
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