CN111654112B - Reactive compensation capacitor early warning method, device and system - Google Patents
Reactive compensation capacitor early warning method, device and system Download PDFInfo
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- QVFWZNCVPCJQOP-UHFFFAOYSA-N chloralodol Chemical compound CC(O)(C)CC(C)OC(O)C(Cl)(Cl)Cl QVFWZNCVPCJQOP-UHFFFAOYSA-N 0.000 description 3
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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- H—ELECTRICITY
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00016—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
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- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
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Abstract
The invention discloses a reactive compensation capacitor early warning method, a device and a system, wherein the method comprises the following steps: acquiring a plurality of index data corresponding to the indexes of the capacitor and time points carried by the index data according to the acquired operation data of the capacitor; determining at least one data interval corresponding to a plurality of index data; determining the duration corresponding to the data interval according to the time point carried by the index data in the data interval; and acquiring the reference duration corresponding to the data interval, and determining the early warning information corresponding to the capacitor according to the duration corresponding to the data interval and the reference duration. According to the technical scheme, the capacitor can be early warned in advance, the duration of the data interval is considered in the obtained early warning information, the possibility of misjudgment caused by transient abnormality of the operation data of the capacitor due to external interference is reduced, and the accuracy of the early warning information is ensured.
Description
Technical Field
The invention relates to the technical field of energy, in particular to a reactive compensation capacitor early warning method, device and system.
Background
In order to avoid charging punishment power rate adjustment electric charge of a supplied enterprise, a power consumer usually installs a reactive power compensation device in the power utilization system of the unit, so that the absorption of reactive power from a power grid system is reduced. Power capacitors are widely used as reactive power compensation power sources due to their low cost advantage. Depending on the load characteristics of the power consumer, the capacitors are often grouped in parallel and switched into the power line, either for centralized compensation, or for decentralized local compensation, etc. However, because of factors such as product quality, voltage quality, ambient temperature and maintenance quality, the power capacitor is often damaged in use, if the factors are not found and solved in time, the temperature of the capacitor is too high, so that an explosion occurs to cause a fire, and reactive compensation capacity provided by the power capacitor is insufficient, so that the power factor of a power user is lowered, power rate adjustment electricity charges are required, and the loss of a power supply line is increased.
At present, distribution facilities of a plurality of power users are entrusted to professional power operation and maintenance companies to be responsible for management, and the operation and maintenance companies often adopt a periodic inspection method for the capacitor, namely, the operation and maintenance companies regularly go to a reactive compensation cabinet to observe whether the shell of the capacitor changes or not, whether abnormal sounds exist or not and the like, and if the capacitor is found to be damaged, the capacitor is replaced.
However, the above method can only be found after a significant fault occurs, and the condition of the capacitor cannot be early warned.
Disclosure of Invention
The invention provides a reactive compensation capacitor early warning method, device and system, which can realize early warning on a capacitor in advance. The early warning information is determined based on the real operation data of the capacitor, the duration of a data interval is comprehensively considered, the possibility of misjudgment caused by transient abnormality of the operation data of the capacitor due to external interference is reduced, the accuracy of the early warning information is ensured, the switching of the capacitor can be regulated and controlled or the capacitor can be maintained subsequently based on the early warning information of the capacitor, the possibility of accidents is reduced, and the economic benefit of power users is ensured.
In a first aspect, the invention provides a reactive compensation capacitor early warning method, which includes:
acquiring a plurality of index data corresponding to the indexes of the capacitor and time points carried by the index data according to the acquired operation data of the capacitor;
determining at least one data interval corresponding to a plurality of index data;
determining the duration corresponding to the data interval according to the time point carried by the index data in the data interval;
and acquiring the reference duration corresponding to the data interval, and determining the early warning information corresponding to the capacitor according to the duration corresponding to the data interval and the reference duration.
Optionally, the determining, according to a time point carried by the indicator data located in the data interval, a duration corresponding to the data interval includes:
counting time points carried by the index data in the data interval, and determining at least one target time interval corresponding to the data interval, wherein the time points carried by the index data in the target time interval are continuous;
and determining the duration corresponding to the data interval according to each target time interval.
Optionally, the capacitor metrics include one or more of phase current, phase voltage, phase reactive power, and temperature;
when the capacitor indicator includes phase reactive power, the indicator data includes actual phase reactive power determined based on phase voltage fundamental and phase current fundamental of the capacitor; the data interval is determined based on theoretical phase reactive power determined based on phase voltage fundamental, capacitance and phase fundamental frequency of the capacitor.
In a second aspect, the present invention provides a reactive compensation capacitor early warning device, including:
the data acquisition module is used for acquiring a plurality of index data corresponding to the indexes of the capacitor and time points carried by the index data according to the acquired operation data of the capacitor;
the set determining module is used for determining at least one data interval corresponding to the index data;
the duration determining module is used for determining the duration corresponding to the data interval according to the time point carried by the index data in the data interval;
and the early warning module is used for acquiring the reference duration corresponding to the data interval and determining early warning information corresponding to the capacitor according to the duration corresponding to the data interval and the reference duration.
In a third aspect, the present invention provides a reactive compensation capacitor early warning system, which is characterized by comprising: the system comprises a capacitor, a sensor, a remote data transmitter, an intelligent gateway and a cloud platform server;
the sensor is used for collecting the operation data of the capacitor;
the remote data transmitter is used for receiving the operation data of the capacitor and uploading the operation data of the capacitor to the intelligent gateway based on a remote wireless transmission technology of a spread spectrum technology;
the intelligent gateway is used for receiving the operation data of the capacitor uploaded by the remote data transmitter and uploading the operation data of the capacitor to the cloud platform server;
the cloud platform server is used for receiving the operation data of the capacitor uploaded by the intelligent gateway and obtaining the early warning information of the capacitor according to the method in the first aspect.
Optionally, the method further comprises: a mobile terminal;
the cloud platform server is further used for sending the early warning information of the capacitor to the mobile terminal;
the mobile terminal is used for receiving the early warning information of the capacitor sent by the cloud platform server.
Optionally, the sensor comprises any one or more of a current sensor, a voltage sensor and a temperature sensor;
the remote data transmitter comprises a data interface of a phase current signal, a data interface of a phase voltage signal, a data interface of a temperature signal and an ultra-long-distance wireless transmission scheme module based on a spread spectrum technology;
the intelligent gateway comprises any one or more of a fourth generation communication technology module, a fifth generation communication technology module and a general packet radio service technology module.
Optionally, the current sensor is configured to collect a current on any branch circuit after the capacitors are connected in parallel;
the voltage sensor is used for collecting the voltage on any branch circuit after the capacitors are connected in parallel;
the temperature sensor is used for collecting the temperature of the capacitor.
Optionally, the current sensor and the voltage sensor are connected with the remote data transmitter by a cable;
the temperature sensor is connected with the remote data sensor through a bus.
Optionally, the bus comprises an RS485 bus.
In a fourth aspect, the present invention provides a computer-readable storage medium comprising executable instructions that, when executed by a processor of a cloud platform server, perform the method according to any one of the first aspect.
The invention provides a reactive compensation capacitor early warning method, a device and a system, the method acquires a plurality of index data corresponding to the indexes of a capacitor and time points carried by each index data according to a plurality of acquired operation data of the capacitor, thereby knowing the real operation condition of the capacitor, then determines a plurality of data intervals corresponding to the index data, then determines the duration corresponding to the data intervals according to the time points corresponding to the index data in the data intervals, the obtained duration indicates the accumulated duration of the data intervals, then acquires the reference duration corresponding to the data intervals, determines the early warning information corresponding to the capacitor according to the duration and the reference time sequence duration corresponding to the data intervals, realizes early warning on the capacitor in advance, and the obtained early warning information is determined based on the real operation data of the capacitor, the duration of the data interval is comprehensively considered, the possibility of misjudgment caused by transient abnormality of the operation data of the capacitor due to external interference is reduced, and the accuracy of the early warning information is ensured. In conclusion, according to the technical scheme provided by the invention, the capacitor can be early warned in advance, the accuracy of early warning information is ensured, the switching of the capacitor can be regulated and controlled or the capacitor can be maintained subsequently based on the early warning information of the capacitor, the possibility of accidents is reduced, and the economic benefit of power users is ensured.
Further effects of the above-mentioned unconventional preferred modes will be described below in conjunction with specific embodiments.
Drawings
In order to more clearly illustrate the embodiments or the prior art solutions of the present invention, 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 only some embodiments described in the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
Fig. 1 is a schematic flow chart of a reactive compensation capacitor early warning method according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of another reactive compensation capacitor early warning method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a reactive compensation capacitor early warning device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a reactive compensation capacitor early warning system according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another reactive compensation capacitor early warning system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail and completely with reference to the following embodiments and accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a reactive compensation capacitor early warning method, including the following steps:
Specifically, the capacitor index includes, but is not limited to, one or more of phase current, phase voltage, phase reactive power, and temperature, and is specifically determined according to actual conditions, and is not specifically limited herein.
Specifically, the index data is a large amount, each index data carries a time point, the time points carried by the index data should be located within a certain time period, where the time period specifically needs to be determined in combination with an actual scene, for example, when the capacitor needs to be analyzed within a certain 2 days, the time period may be 48 hours, and when the capacitor needs to be pre-warned in real time, the time period may be 24 hours. It should be noted that the index data is determined based on the operation data of the capacitor collected by the sensor, the sensor includes any one of a current sensor, a voltage sensor and a temperature sensor, and when the index of the capacitor is voltage, current or temperature, the index data is collected by the current sensor, the voltage sensor or the temperature sensorThe data is index data. When the index of the capacitor is the phase reactive power, the index data is the actual phase reactive power obtained by calculating the data collected by the sensor. The actual phase reactive power is determined based on the phase voltage fundamental and the phase current fundamental of the capacitor. Specifically, the actual phase reactive power Q is calculated by the following formula (1)Practice of：
QPractice of＝U1I1sinθ (1)
Wherein, U1Represents a phase voltage fundamental wave of the capacitor; i is1Representing a phase current fundamental wave of the capacitor; and theta is a voltage current phase angle.
The embodiment of the invention is suitable for a scene of real-time monitoring and early warning or a scene of analyzing a capacitor in a certain period. When the capacitor needs to be pre-warned in real time, the corresponding time length of the time points carried by the plurality of index data can be 24 hours, and the corresponding end time is the current time.
And 102, determining at least one data interval corresponding to a plurality of index data.
The data interval may be determined from a preset reference data interval, or may be determined by dividing a plurality of index data into intervals, and is not particularly limited herein. The data interval specifically refers to a data range, and may be plural. The data interval needs to be determined in combination with the own parameters of the capacitor and the operating environment.
In a possible implementation manner, a plurality of reference data intervals corresponding to the capacitor indexes are obtained, and a plurality of data intervals to which the plurality of index data belong are determined from the plurality of reference data intervals.
In a feasible implementation manner, a plurality of reference data intervals corresponding to the capacitor indexes and identifiers of the reference data intervals are obtained, identifiers corresponding to the index data are determined, and the reference data intervals corresponding to different identifiers are determined as data intervals.
When the capacitor needs to be warned in real time, optionally, a plurality of current index data corresponding to the current time period are determined from a plurality of reference index data, any one of the above implementation manners is selected, and a plurality of data intervals corresponding to the plurality of current index data are determined from each reference data interval. The ending time corresponding to the current time interval is the current time, the current time interval may be 30 seconds or 1 minute, and the specific requirement is determined by combining with the actual requirement. The embodiment of the invention is suitable for the analysis of the operation condition of the capacitor in a certain period of time or the scene of analyzing the operation condition of the capacitor in real time.
For example, there are 5 reference data intervals corresponding to the phase voltages, each of which is (— ∞, 1.1U)n)、[1.1Un，1.15Un)、[1.15Un，1.2Un)、[1.2Un，1.3Un)、[1.3Un, + ∞), wherein, UnRepresents the rated voltage of the capacitor; the reference data intervals corresponding to the phase currents are 3 and are respectively (— infinity, 1.3I)n]、(1.3In，1.5In)、[1.5In, + ∞) in which InRepresents the rated current of the capacitor; the number of data intervals corresponding to the temperature is 3, and the data intervals are respectively (— ∞, 40)](40, 50), [50, + ∞); the reference data intervals corresponding to the phase reactive power are 5, and are respectively (- ∞, 0.85Q)Theory of the invention]、(0.85QTheory of the invention，0.9QTheory of the invention)、[0.9QTheory of the invention，1.1QTheory of the invention]、(1.1QTheory of the invention，1.2QTheory of the invention)、[1.2QTheory of the invention, + ∞), wherein QTheory of the inventionRepresenting the theoretical phase reactive power. Specifically, the theoretical phase reactive power Q is calculated by the following formula (2)Theory of the invention：
Wherein C represents a capacitor nominal capacitance value; u shape1Represents a phase voltage fundamental wave of the capacitor; f represents the phase fundamental frequency.
It should be noted that the boundary value in the reference data interval may be adjusted according to actual conditions. It should also be noted that the theoretical phase reactive power and the actual phase reactive power are temporally related, in other words, the edges of the reference data intervalThe boundary value may change in real time, and therefore, when determining the data interval corresponding to the phase reactive power, an identifier may be set for the reference data interval, and then, the identifier of the reference data interval corresponding to each index data is determined, and the data interval is determined based on the identifier. Here, when the boundary value of the reference data interval changes in real time, the data meaning of the data interval is the same, for example, the reference data interval (0.85Q)Theory of the invention，0.9QTheory of the invention) There may be multiple boundary values, but the data meaning is unique.
Specifically, the duration refers to an accumulated duration in the data interval.
Optionally, the determining, according to the time point carried by the index data located in the data interval, a duration corresponding to the data interval includes
Counting time points carried by the index data in the data interval, and determining at least one target time interval corresponding to the data interval, wherein the time points carried by the index data in the target time interval are continuous;
and determining the duration corresponding to the data interval according to each target time interval.
Specifically, for each data interval, time points carried by a plurality of index data in the data interval are determined, a time point set is formed by the time points carried by the index data, the time points carried by the index data in the time point set are counted, a plurality of target time periods are determined, the time points in the target time periods are continuous, in other words, the time duration between any two adjacent time points in the time sequence is equal, and then the duration of the data interval is determined according to each target time period, so that the obtained duration can accurately reflect the operation condition of the capacitor. The time point sets comprise time points carried by a plurality of index data in corresponding data intervals respectively, each time point set corresponds to one data interval, and different data intervals correspond to different time point sets. When the index data carries the identifier of the reference data interval, the time points respectively carried by a plurality of index data with the same identifier form a corresponding time point set. The target period corresponds to the data interval.
For example, suppose that the N actual phase reactive powers are P1、…、PNCalculating theoretical phase reactive power corresponding to each actual phase reactive power according to the formula (2), then determining reference data interval corresponding to each actual phase reactive power, and assuming that P is the number of reference data intervals1、…、PNThe data meaning of the respective reference data interval belongs to (0.85Q)Theory of the invention，0.9QTheory of the invention) Although the boundary values of the reference data intervals may be different, the data meanings are the same, and (0.85Q)Theory of the invention，0.9QTheory of the invention) Is determined as a data interval, P1、…、PNThe time points carried separately form a set of time points.
Specifically, the maximum value in the time duration corresponding to each target time period is determined as the duration of the data interval, a weight may be set for each target time period, the product of the time duration corresponding to the target time period and the weight is determined, and the obtained maximum value is determined as the duration of the data interval.
And 104, acquiring reference duration corresponding to the data interval, and determining early warning information corresponding to the capacitor according to the duration corresponding to the data interval and the reference duration.
Specifically, the duration corresponding to the data interval is considered in the early warning information, so that the early warning information has a relatively high reference value. The reference duration needs to be determined in combination with the own parameters of the capacitor and the operating environment.
Specifically, the early warning information includes, but is not limited to, a security status keyword or an early warning status keyword corresponding to each of a plurality of capacitor indicators, where the security status keyword specifically refers to a word indicating that the capacitor is in a security status, for example, the security status keyword of phase reactive power may be that the phase reactive power is normal or not warning, the security status keyword of phase current may be that the current is normal or not warning, the security status keyword of phase voltage may be that the voltage is normal or not warning, and the security status keyword of temperature may be that the temperature is normal or not warning; the early warning state early warning keyword specifically refers to a word for indicating that the capacitor is in an early warning state, for example, the early warning state keyword of the phase reactive power may be that the phase reactive power is too large or too small, the early warning state keyword of the phase current may be an overcurrent, the early warning state keyword of the phase voltage may be an overvoltage, and the early warning state keyword of the temperature may be an overtemperature.
Specifically, the reference duration corresponding to the data interval is obtained, so that the judgment value of the abnormal operation of the capacitor is determined, then the reference duration corresponding to the data interval is compared with the duration, when the duration is greater than or equal to the reference duration, the operation fault of the capacitor is explained, the early warning state keyword can be determined as alarm information, the duration of the data interval is considered in the obtained early warning information, the possibility of misjudgment caused by the short abnormal operation data of the capacitor due to external interference is reduced, and the accuracy is relatively high. It should be noted that, if the duration corresponding to any one data interval is greater than or equal to the reference duration, it may be said that the capacitor is abnormal in operation, and the early warning state keyword is determined as the early warning information of the capacitor.
Specifically, a maintenance schedule for the capacitor may be subsequently determined based on the early warning information. Specifically, a plurality of capacitor indexes corresponding to a plurality of early warning state keywords are selected from safety state keywords or early warning state keywords corresponding to each capacitor index in the early warning information, and the capacitor indexes are analyzed to determine a maintenance scheme of the capacitor. When the capacitor indexes corresponding to the early warning state keywords comprise phase reactive power, the maintenance scheme comprises replacing the capacitor, and regulating and controlling the running state of the capacitor to be shutdown; when the capacitor index corresponding to the early warning state keyword does not include phase reactive power and includes temperature, the maintenance scheme includes that whether the capacitor fails or not is determined by considering the external environment and the operation condition of the capacitor, and the operation state of the capacitor is regulated and controlled to be shutdown; when the capacitor indexes corresponding to the early warning state keywords do not include phase reactive power and temperature, and the indexes include current or voltage, the maintenance scheme includes that the line corresponding to the phase current or the phase voltage is adjusted, replaced or stopped, and the operation state of the control capacitor is the corresponding line stopped.
Optionally, the method further comprises: the early warning information of the capacitor is sent to the mobile terminal corresponding to the capacitor, so that operation and maintenance personnel corresponding to the mobile terminal can maintain the capacitor in time, and the possibility of accidents of the capacitor is reduced.
According to the technical scheme, the beneficial effects of the embodiment are as follows: on one hand, the operation data of the capacitor is monitored in real time, so that early warning is carried out on the capacitor in advance; on the other hand, the obtained early warning information is determined based on the real operation data of the capacitor, meanwhile, the occurrence time of a data interval is considered by the early warning information, the possibility of misjudgment caused by transient abnormity of the operation data of the capacitor due to external interference is reduced, the accuracy of the early warning information is ensured, the capacitor can be regulated and controlled or maintained based on the early warning information of the capacitor subsequently, the possibility of accidents is reduced, and the economic benefit of power users is ensured; on the other hand, the reference duration of the capacitor can be flexibly adjusted according to the running condition of the capacitor, so that the method is suitable for different application scenes.
Fig. 1 shows only a basic embodiment of the method of the present invention, and based on this, certain optimization and expansion can be performed, and other preferred embodiments of the method can also be obtained.
Fig. 2 shows another embodiment of the reactive compensation capacitor warning method according to the present invention. On the basis of the foregoing embodiments, the present embodiment is described in more detail with reference to application scenarios. The method specifically comprises the following steps:
Assume capacitor metrics including temperature, phase currentPhase voltage and phase reactive power, specifically, phase current, phase voltage and temperature of a capacitor collected by a voltage sensor, a current sensor and a temperature sensor are obtained, the phase current and the phase voltage are decomposed by a Fourier transform algorithm to obtain phase voltage fundamental wave, phase current fundamental wave and phase fundamental wave frequency, and actual phase reactive power Q is obtained by calculation of the formula (1)Practice ofTo obtain actual phase reactive power QPractice ofAnd a plurality of index data corresponding to the phase current, the phase voltage and the temperature. The time point carried by the index data indicates the running time of the index data.
5 reference data intervals corresponding to the phase voltage, 3 reference data intervals corresponding to the phase current, 3 reference data intervals corresponding to the temperature, and 5 reference data intervals corresponding to the phase reactive power mentioned in the above step 202 are obtained.
Suppose the preset time period is t and the current time is tiIf the ending time corresponding to the current time interval is tiThe starting time is ti-t. For convenience of description, in the embodiment of the present invention, only the capacitor index is taken as an example for description, and a plurality of index data corresponding to the current time period are determined from the index data corresponding to the temperature, assuming that t is ti-t to tiThe temperature values in the period are respectively T1、…、TnDetermining T from 3 reference data intervals corresponding to the temperature1、…、TnThe data interval to which it belongs.
Let T be1、…、TnThe number of the data interval is 1, is [50, + ∞), T1、…、TiRespectively carry the time points of
Increase in time series if
At any two adjacent time points, i.e. at the same time interval
And
the time interval between,
And
the time interval between, …,
And
the time intervals are equal, the target time interval is
To
And 204, determining the duration corresponding to the data interval according to each target time interval.
When only one target time interval exists, the duration corresponding to the target time interval is determined as the duration, namely
To
The corresponding duration is determined as the duration.
The detailed relationship between the reference duration and the warning status is shown in table 1 below:
TABLE 1
The reference duration corresponding to the data acquisition interval [50, + ∞) ] is 1min, then
And
the corresponding duration is compared with the reference duration of 1min when
And
and when the corresponding time is longer than 1min, the early warning information of the capacitor is an alarm, otherwise, the alarm is not given.
Assuming that the early warning state keywords include overcurrent, overvoltage, excessive phase reactive power and overtemperature, the 4 capacitor indexes corresponding to the early warning state keywords are phase current, phase voltage, phase reactive power and temperature respectively, and assuming that the weighted values corresponding to the phase current, the phase voltage, the phase reactive power and the temperature respectively are IQ、UQ、PQ、TQWherein P isQ>TQ>IQ＝UQWherein the weight indicates the fault degree of the capacitor, optionally using the maintenance scheme corresponding to the phase reactive power as electricityAnd (4) a maintenance scheme of the container, namely replacing the capacitor capable of normally operating by the capacitor, and stopping the operation of the capacitor.
According to the technical scheme, the beneficial effects of the embodiment are as follows: on one hand, the operation data of the capacitor is monitored in real time, so that early warning is carried out on the capacitor in advance; on the other hand, the obtained early warning information is determined based on the real operation data of the capacitor, meanwhile, the occurrence time of a data interval is considered by the early warning information, the possibility of misjudgment caused by transient abnormity of the operation data of the capacitor due to external interference is reduced, the accuracy of the early warning information is ensured, the capacitor can be regulated and controlled or maintained based on the early warning information of the capacitor subsequently, the possibility of accidents is reduced, and the economic benefit of power users is ensured; on the other hand, the reference duration of the capacitor can be flexibly adjusted according to the running condition of the capacitor, so that the method is suitable for different application scenes.
Based on the same concept as the method embodiment of the present invention, referring to fig. 3, an embodiment of the present invention further provides a reactive compensation capacitor early warning device, including:
the data acquisition module 301 is configured to acquire a plurality of index data corresponding to indexes of the capacitor and time points carried by the index data according to the acquired operation data of the capacitor;
a set determining module 302, configured to determine at least one data interval corresponding to a plurality of index data;
a duration determining module 303, configured to determine, according to a time point carried by the indicator data located in the data interval, a duration corresponding to the data interval;
the early warning module 304 is configured to obtain a reference duration corresponding to the data interval, and determine early warning information corresponding to the capacitor according to the duration corresponding to the data interval and the reference duration.
In an embodiment of the present invention, the duration determining module 302 includes: a counting unit and a duration determining unit; wherein,
the statistical unit is configured to perform statistics on time points carried by the indicator data located in the data interval, determine at least one target time interval corresponding to the data interval, where the time points carried by the indicator data located in the target time interval are continuous;
and the duration determining unit is used for determining the duration corresponding to the data interval according to each target time interval.
In one embodiment of the invention, the capacitor metrics include one or more of phase current, phase voltage, phase reactive power, and temperature;
when the capacitor indicator includes phase reactive power, the indicator data includes actual phase reactive power determined based on phase voltage fundamental and phase current fundamental of the capacitor; the data interval is determined based on theoretical phase reactive power determined based on phase voltage fundamental, capacitance and phase fundamental frequency of the capacitor.
Referring to fig. 4, an embodiment of the present invention provides a reactive compensation capacitor early warning system, including: a capacitor 401, a sensor 402, a remote data transmitter 403, an intelligent gateway 404, and a cloud platform server 405;
the sensor 402 is used for collecting the operation data of the capacitor 401;
the remote data transmitter 403 is configured to receive the operation data of the capacitor 401, and upload the operation data of the capacitor 401 to the intelligent gateway 404 based on a long-distance wireless transmission technology of a spread spectrum technology;
the intelligent gateway 404 is configured to receive the operation data of the capacitor 401 uploaded by the remote data transmitter 403, and upload the operation data of the capacitor 401 to the cloud platform server 405;
the cloud platform server 405 is configured to receive the operation data of the capacitor 401 uploaded by the intelligent gateway 404, and obtain the warning information of the capacitor 401 according to the method of any of the embodiments.
The embodiment of the invention provides a reactive compensation capacitor early warning system, which comprises: a capacitor 401, a sensor 402, a remote data transmitter 403, an intelligent gateway 404, and a cloud platform server 405; the sensor 402 is used for collecting the operation data of the capacitor 401, so as to obtain the real operation data of the capacitor; the remote data transmitter 403 is configured to receive the operating data of the capacitor 401, and upload the operating data of the capacitor 401 to the intelligent gateway 404 based on a long-distance wireless transmission technology of a spread spectrum technology, where the intelligent gateway 404 is configured to receive the operating data of the capacitor 401 uploaded by the remote data transmitter 403, and upload the operating data of the capacitor 401 to the cloud platform server 405, so that remote transmission is achieved, and signal stability is ensured; the cloud platform server 405 is configured to receive the operation data of the capacitor 401 uploaded by the intelligent gateway 404, and obtain the early warning information of the capacitor 401 according to the method of any one of the embodiments, on one hand, the cloud platform server realizes early warning of the capacitor in advance, the obtained early warning information is determined based on the real operation data of the capacitor, and meanwhile, the occurrence time of a data interval is considered by the early warning information, so that the possibility of misjudgment caused by transient abnormality of the operation data of the capacitor due to external interference is reduced, the accuracy of the early warning information is ensured, and the reference duration of the capacitor can be flexibly adjusted according to the operation condition of the capacitor, so that the cloud platform server adapts to different application scenarios; and on the other hand, unified and centralized management of the capacitors is facilitated.
Specifically, the sensor 402 is connected to the remote data transmitter 403, so that the remote data transmitter 403 receives the operation data of the capacitor 401 collected by the sensor 402, and optionally, the sensor 402 includes any one or more of a current sensor, a voltage sensor, and a temperature sensor.
In order to reduce the number of sensors 402 and reduce the cost, optionally, the current sensor is used for collecting the current on any branch after the capacitors 401 are connected in parallel; the voltage sensor is used for collecting the voltage on any branch circuit after the capacitors 401 are connected in parallel.
Specifically, after the capacitors 401 are connected in parallel, the voltage on any branch is the same, and the capacitors 401 on each branch are mutually influenced, so that the operating condition of the capacitors 401 on the branches connected in parallel can be known by measuring the current on the branches connected in parallel through the current sensor and measuring the voltage on the branches connected in parallel through the voltage sensor.
Considering the relatively small number of current sensors and voltage sensors, in some possible embodiments, the current sensors and the voltage sensors are connected to the remote data transmitter 403 by cables.
The temperature sensor is used for acquiring the temperature of the capacitors 401, that is, each capacitor 401 corresponds to one temperature sensor, and in order to measure the temperature of the capacitor 401 more accurately, the temperature sensor is a patch sensor 402 and can be fixed on the surface of the housing of the capacitor 401.
Considering that the temperature sensor has more nodes, and in order to ensure that the temperature signal is not interfered, optionally, the temperature sensor is connected to the remote data sensor 402 through a bus, where the bus may be a wired bus, such as an RS485 bus, and correspondingly, the temperature sensor should support an RS485 networking mode.
Considering that the distance between the intelligent gateway 404 and the sensor 402 may be relatively long, which may cause signals to be easily interfered, in order to support long-distance transmission, an ultra-long-distance wireless transmission scheme module based on a spread spectrum technology is provided in the remote data sensor 402, preferably a LoRa communication module having advantages of long transmission distance, large capacity, fast transmission rate, low power consumption, etc., and the intelligent gateway 404 includes any one or more of a fourth-generation communication technology module, a fifth-generation communication technology module, and a general packet radio service technology module, thereby implementing long-distance transmission of signals.
To ensure that the remote data transmitter 403 is able to receive the signals sent by the sensor 402, while taking into account that the voltages and currents are phase voltages and phase currents, optionally the remote data transmitter 403 comprises a data interface for phase current signals, a data interface for phase voltage signals and a data interface for temperature signals.
It should be noted that, when the temperature sensor adopts an RS485 networking supporting manner, the data interface of the temperature signal should have an RS485 interface. It should be noted that the data interface of the phase current signal includes, but is not limited to, a data interface of at least three-phase current signal analog quantity, and the data interface of the phase voltage signal includes, but is not limited to, a data interface of at least three-phase voltage signal analog quantity.
Referring to fig. 5, in order to facilitate timely maintenance of the capacitor 401, optionally, the method further includes: a mobile terminal 406; the cloud platform server 405 is further configured to send the warning information of the capacitor 401 to the mobile terminal 406. The mobile terminal 406 is configured to receive the warning information of the capacitor 401 sent by the cloud platform server 405.
Specifically, the mobile terminal 406 should be a mobile phone of a maintenance person, so that the maintenance person can know the warning information of the capacitor 401, and the capacitor 401 can be maintained in time, thereby reducing the possibility of accidents.
For example, the capacitor cabinet includes a plurality of reactive compensation capacitor groups, the plurality of reactive compensation capacitor groups are connected in parallel, each reactive compensation capacitor group includes a plurality of capacitors 401, each reactive compensation capacitor group is provided with a voltage sensor and a current sensor, the voltage sensor measures a group voltage of the reactive compensation capacitor group, the current sensor measures a group current of the reactive compensation capacitor group, and voltage and current signals are directly connected to the remote data transmitter 403 through a cable; each capacitor in each reactive compensation capacitor group is provided with a temperature sensor, the temperature sensors adopt patch sensors, the patch sensors are connected into a remote data transmitter 403 through an RS485 bus, and each capacitor cabinet is provided with one remote data transmitter 403. The LoRa communication module is embedded into the remote data transmitter 403, each remote data transmitter 403 transmits data acquired by the sensor 402 to the intelligent gateway 404 by using the LoRa communication network, the intelligent gateway 404 is embedded with a wireless module which can select 4G, 5G or GPRS modules, and the intelligent gateway 404 transmits monitoring data of the reactive compensation capacitor of each capacitor cabinet to the cloud platform server 405 through a wireless network. One intelligent gateway 404 manages a plurality of capacitor cabinets, and each intelligent gateway 404 and each remote data transmitter 403 is provided with a unique identification name and address. The cloud platform server 405 receives and processes data, uploaded by the intelligent gateway 404, acquired by the sensor 402, so that unified management, such as monitoring, early warning and the like, of the plurality of capacitors 401 is realized, a dedicated fault diagnosis controller does not need to be configured for the capacitors 401, and manufacturing cost is saved. Meanwhile, the cloud platform server 405 may send the alarm information of the capacitor 401 to a mobile terminal 406 of a corresponding operation and maintenance person, such as a mobile phone, so that the operation and maintenance person can operate and maintain the capacitor 401 conveniently, and the possibility of accidents is reduced.
The reactive compensation capacitor early warning system provided by the embodiment of the invention at least has the following beneficial effects:
on one hand, the reactive compensation capacitor early warning system provided by the embodiment of the invention monitors the operation data of the capacitor in real time, so that the capacitor is early warned in advance, the obtained early warning information is determined based on the real operation data of the capacitor, meanwhile, the occurrence time of a data interval is considered by the early warning information, the possibility of misjudgment caused by transient abnormality of the operation data of the capacitor due to external interference is reduced, and the accuracy of the early warning information is ensured; and the reference duration of the capacitor can be flexibly adjusted according to the running condition of the capacitor, so that the method is suitable for different application scenes.
On the other hand, the reactive compensation capacitor early warning system provided by the embodiment of the invention can realize long-distance signal transmission and is stable.
On the other hand, the reactive compensation capacitor early warning system provided by the embodiment of the invention can send the early warning information to the mobile terminal of the operation and maintenance personnel, so that the capacitor can be regulated and controlled or maintained based on the early warning information of the capacitor, the possibility of accidents is reduced, and the economic benefit of power users is ensured.
In another aspect, the reactive compensation capacitor early warning system provided by the embodiment of the invention can realize unified management, such as monitoring, early warning and the like, on the capacitor, a special fault diagnosis controller does not need to be configured for the capacitor, and the manufacturing cost is saved.
It should be noted that the cloud platform server 405 includes the data acquisition module 301, the set determination module 302, the duration determination module 303, and the early warning module 304 shown in fig. 3.
In an embodiment of the present invention, the duration determining module 302 includes: a counting unit and a duration determining unit; wherein,
the statistical unit is configured to perform statistics on time points carried by the indicator data located in the data interval, determine at least one target time interval corresponding to the data interval, where the time points carried by the indicator data located in the target time interval are continuous;
and the duration determining unit is used for determining the duration corresponding to the data interval according to each target time interval.
In one embodiment of the invention, the capacitor metrics include one or more of phase current, phase voltage, phase reactive power, and temperature;
when the capacitor indicator includes phase reactive power, the indicator data includes actual phase reactive power, the actual phase reactive power is determined based on a phase voltage fundamental and a phase current fundamental of the capacitor, the data interval is determined based on theoretical phase reactive power, and the theoretical phase reactive power is determined based on the phase voltage fundamental, a capacitance value, and a phase fundamental frequency of the capacitor.
All or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method 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.
The embodiments of the present invention are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the apparatus embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or boiler 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 boiler. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or boiler that comprises the element.
The above description is only an example of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (8)
1. A reactive compensation capacitor early warning method is characterized by comprising the following steps:
acquiring a plurality of index data corresponding to the indexes of the capacitor and time points carried by the index data according to the acquired operation data of the capacitor;
determining at least one data interval corresponding to a plurality of index data;
determining the duration corresponding to the data interval according to the time point carried by the index data in the data interval;
acquiring reference duration corresponding to the data interval, and determining early warning information corresponding to the capacitor according to the duration corresponding to the data interval and the reference duration;
the determining the duration corresponding to the data interval according to the time point carried by the index data located in the data interval includes:
counting time points carried by the index data in the data interval, and determining at least one target time interval corresponding to the data interval, wherein the time points carried by the index data in the target time interval are continuous;
determining the duration corresponding to the data interval according to each target time interval;
wherein the capacitor metrics include one or more of phase current, phase voltage, phase reactive power, and temperature;
when the capacitor indicator includes phase reactive power, the indicator data includes actual phase reactive power determined based on phase voltage fundamental and phase current fundamental of the capacitor; the data interval is determined based on theoretical phase reactive power determined based on phase voltage fundamental, capacitance and phase fundamental frequency of the capacitor.
2. The utility model provides a reactive compensation condenser early warning device which characterized in that includes:
the data acquisition module is used for acquiring a plurality of index data corresponding to the indexes of the capacitor and time points carried by the index data according to the acquired operation data of the capacitor;
the set determining module is used for determining at least one data interval corresponding to the index data;
the duration determining module is used for determining the duration corresponding to the data interval according to the time point carried by the index data in the data interval;
the early warning module is used for acquiring the reference duration corresponding to the data interval and determining early warning information corresponding to the capacitor according to the duration corresponding to the data interval and the reference duration;
the duration determining module is specifically configured to: counting time points carried by the index data in the data interval, and determining at least one target time interval corresponding to the data interval, wherein the time points carried by the index data in the target time interval are continuous; determining the duration corresponding to the data interval according to each target time interval;
wherein the capacitor metrics include one or more of phase current, phase voltage, phase reactive power, and temperature; when the capacitor indicator includes phase reactive power, the indicator data includes actual phase reactive power determined based on phase voltage fundamental and phase current fundamental of the capacitor; the data interval is determined based on theoretical phase reactive power determined based on phase voltage fundamental, capacitance and phase fundamental frequency of the capacitor.
3. A reactive compensation capacitor early warning system, characterized by includes: the system comprises a capacitor, a sensor, a remote data transmitter, an intelligent gateway and a cloud platform server;
the sensor is used for collecting the operation data of the capacitor;
the remote data transmitter is used for receiving the operation data of the capacitor and uploading the operation data of the capacitor to the intelligent gateway based on a remote wireless transmission technology of a spread spectrum technology;
the intelligent gateway is used for receiving the operation data of the capacitor uploaded by the remote data transmitter and uploading the operation data of the capacitor to the cloud platform server;
the cloud platform server is used for receiving the operation data of the capacitor uploaded by the intelligent gateway and obtaining the early warning information of the capacitor according to the method of claim 1.
4. The system of claim 3, further comprising: a mobile terminal;
the cloud platform server is further used for sending the early warning information of the capacitor to the mobile terminal;
the mobile terminal is used for receiving the early warning information of the capacitor sent by the cloud platform server.
5. The system of claim 3, wherein the sensor comprises any one or more of a current sensor, a voltage sensor, and a temperature sensor;
the remote data transmitter comprises a data interface of a phase current signal, a data interface of a phase voltage signal, a data interface of a temperature signal and an ultra-long-distance wireless transmission scheme module based on a spread spectrum technology;
the intelligent gateway comprises any one or more of a fourth generation communication technology module, a fifth generation communication technology module and a general packet radio service technology module.
6. The system of claim 5, wherein the current sensor is used for collecting the current on any branch after the capacitors are connected in parallel;
the voltage sensor is used for collecting the voltage on any branch circuit after the capacitors are connected in parallel;
the temperature sensor is used for collecting the temperature of the capacitor.
7. The system of claim 5, wherein the current sensor and the voltage sensor are connected by a cable and the remote data transmitter;
the temperature sensor is connected with the remote data sensor through a bus.
8. The system of claim 7, wherein the bus comprises an RS485 bus.
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