CN111787647B - Arc detection method and device and heat storage type electric heating system - Google Patents
Arc detection method and device and heat storage type electric heating system Download PDFInfo
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- CN111787647B CN111787647B CN202010681356.1A CN202010681356A CN111787647B CN 111787647 B CN111787647 B CN 111787647B CN 202010681356 A CN202010681356 A CN 202010681356A CN 111787647 B CN111787647 B CN 111787647B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
Abstract
The invention relates to the technical field of electric control, in particular to an electric arc detection method, an electric arc detection device and a heat storage type electric heating system. The arc detection method provided by the embodiment of the invention comprises the following steps: collecting three-phase voltage and three-phase current of a heating device in real time; determining a three-phase correction voltage according to the three-phase voltage and a preset three-phase standard voltage, and determining a three-phase correction current according to the three-phase current and a preset three-phase standard current; determining a balance voltage between any two phases according to the three-phase correction voltage, and determining a balance current between any two phases according to the three-phase correction current; determining the value of a target phase determination factor according to the correction voltage and the correction current of the target phase, and the balance voltage and the balance current between the two phases except the target phase; and judging whether the value of the judgment factor meets a preset value or not, and if so, generating an alarm signal. The invention judges whether the danger generated by the electric arc exists or not through the value of the judgment factor, and has high reliability.
Description
Technical Field
The invention relates to the technical field of electric control, in particular to an electric arc detection method, an electric arc detection device and a heat storage type electric heating system.
Background
The heat storage type electric heating device heats a heat storage medium by utilizing electric energy, and is mainly applied to the fields of heating, power plant peak regulation and the like. Because the load of the power grid is mainly concentrated in the daytime, and a large amount of electric energy is consumed for heating the heat storage medium, the heat storage type electric heating device stores heat by using electric energy in the low ebb of electricity consumption (such as at night) and releases the stored heat in the high peak of electricity consumption (such as in the daytime) so as to realize heat supply.
The high-power heat storage type electric heating device usually directly adopts high voltage of 10kV and above to supply power to the heating wire so as to reduce the investment cost of electric power equipment. However, in this method, when the heating wire is broken by some accident, an arc is easily generated at the break of the heating wire, a local high temperature is formed, and an accident is easily generated if the arc is not found and treated in time.
In the prior art, the method for monitoring the broken wire of the electric heating wire adopts a simple method for detecting voltage and current and calculating resistance, or adopts a method for alarming by monitoring electric parameters through micro-machine comprehensive protection, and the methods are influenced by the voltage fluctuation of a power grid and the resistance value deviation of the electric heating wire and are easy to report by mistake or fail to report; direct observation is adopted, but the observation dead angle is large, the observation dead angle can be found only after the electric arc occurs, the fault is further enlarged, and the normal operation of the equipment is endangered.
Disclosure of Invention
In view of the above, it is necessary to provide an arc detection method, an arc detection apparatus, and a heat storage type electric heating system.
The embodiment of the invention is realized in such a way that an arc detection method comprises the following steps:
acquiring three-phase voltage and three-phase current of a heating device in real time;
determining a three-phase correction voltage according to the three-phase voltage and a preset three-phase standard voltage, and determining a three-phase correction current according to the three-phase current and a preset three-phase standard current;
determining a balance voltage between any two phases according to the three-phase correction voltage, and determining a balance current between any two phases according to the three-phase correction current;
determining the value of a target phase determination factor according to the correction voltage and the correction current of the target phase, and the balance voltage and the balance current between the two phases except the target phase;
and judging whether the value of the judgment factor meets a preset value or not, and if so, generating an alarm signal.
In one embodiment, there is also provided an arc detection apparatus, including:
the acquisition module is used for acquiring three-phase voltage and three-phase current of the heating device in real time;
The correction module is used for determining a three-phase correction voltage according to the three-phase voltage and a preset three-phase standard voltage and determining a three-phase correction current according to the three-phase current and a preset three-phase standard current;
the balance operation module is used for determining the balance voltage between any two phases according to the three-phase correction voltage and determining the balance current between any two phases according to the three-phase correction current;
the judgment factor operation module is used for determining the value of a target phase judgment factor according to the correction voltage and the correction current of the target phase and the balance voltage and the balance current between the two phases except the target phase;
and the alarm module is used for judging whether the value of the judgment factor meets a preset value or not, and generating an alarm signal if the value of the judgment factor meets the preset value.
In one embodiment, there is also provided a regenerative electric heating system, comprising:
the heating execution module is used for heating the medium;
and the control module is electrically connected with the heating execution module, is used for controlling the work of the heating execution module and monitoring the electric arc of the heating execution module by operating the electric arc detection method according to any embodiment of the invention.
The arc detection method provided by the embodiment of the invention determines the value of the judgment factor of the target phase by acquiring the three-phase current and the voltage, determines whether the danger of generating the arc exists and generates a corresponding alarm signal by comparing whether the value of the judgment factor of any phase meets the preset value, and the method avoids the problems of false alarm, missing alarm and the like in the prior art by a simple electric parameter operation or image acquisition mode; in addition, the operation of the value of the judgment factor provided by the invention also refers to three-phase standard current and three-phase standard voltage, so that false alarm caused by power grid voltage fluctuation or resistance value manufacturing errors of the electric heating wire can be avoided, and the reliability of system alarm is improved.
Drawings
FIG. 1 is a diagram illustrating an exemplary embodiment of an arc detection method;
FIG. 2 is a flow diagram of an arc detection method provided by one embodiment;
FIG. 3 is a flowchart of the steps for determining the three-phase correction voltage according to the three-phase voltage and the predetermined three-phase standard voltage in FIG. 2;
FIG. 4 is a flowchart illustrating steps of determining three-phase correction currents according to the three-phase currents and a predetermined three-phase standard current in FIG. 2;
FIG. 5 is a block diagram of an arc detection device according to an embodiment;
FIG. 6 is a block diagram of an internal structure of a computer device, according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms unless otherwise specified. These terms are only used to distinguish one element from another. For example, a first xx script may be referred to as a second xx script, and similarly, a second xx script may be referred to as a first xx script, without departing from the scope of the present application.
Fig. 1 is a diagram of an application environment of the arc detection method provided in an embodiment, as shown in fig. 1, in which a heating assembly 100 and a control assembly 200 are included.
In the embodiment of the present invention, the heating assembly 100 is connected in a star shape, and the heating assembly 100 heats the medium by using electric energy. Each phase of the heating assembly 100 is connected in series with a plurality of heating units, if a certain heating unit is partially disconnected, no arc is generated, and if the heating unit is completely disconnected, an arc may be generated at the disconnected position, and the high temperature and high heat of the arc threatens the normal operation of the equipment, so that the damage is further enlarged.
In the embodiment of the present invention, the control assembly 200 is electrically connected to the heating assembly 100, controls the operation of the heating assembly 100 by collecting the operation parameters of the heating assembly 100, and realizes the detection of the arc by operating the arc detection algorithm provided by the present invention. In an embodiment of the present invention, the control assembly 200 may be formed by one or more computer devices.
As shown in fig. 2, in one embodiment, an arc detection method is provided, and the embodiment is mainly illustrated by applying the method to the control component 200 in fig. 1. Specifically, the method may include steps S202 to S210:
and S202, acquiring three-phase voltage and three-phase current of the heating device in real time.
In the embodiment of the present invention, the three-phase voltage and the three-phase current refer to the voltage of each phase and the current of each phase, wherein the three-phase voltage may be denoted as Ua、UbAnd UcAnd the three-phase current can be recorded as Ia、IbAnd Ic. In the embodiment of the present invention, the voltage or current acquisition means may be implemented by referring to the prior art, and how to acquire the three-phase voltage and the three-phase current is not specifically limited in the embodiment of the present invention.
And S204, determining a three-phase correction voltage according to the three-phase voltage and a preset three-phase standard voltage, and determining a three-phase correction current according to the three-phase current and a preset three-phase standard current.
In the embodiment of the invention, the three-phase voltage is modified through the three-phase standard voltage, and the three-phase current is modified through the three-phase standard current, so that false alarm caused by power grid voltage fluctuation or resistance value manufacturing errors of the electric heating wire can be avoided.
Step S206, determining the balance voltage between any two phases according to the three-phase corrected voltage, and determining the balance current between any two phases according to the three-phase corrected current.
In the embodiment of the invention, the non-target phase two-phase balance voltage and the balance current are adopted to participate in the calculation of the target phase determination factor, but the three-phase balance voltage and the balance current are not directly adopted to participate in the calculation of the target phase determination factor, so that the influence of the target phase in the fault process can be reduced, and the accuracy of alarming is improved.
Step S208, determining a value of a target phase determination factor according to the correction voltage and the correction current of the target phase, and the balance voltage and the balance current between the two phases other than the target phase.
In the embodiment of the invention, the value of the judgment factor of the target phase is determined to judge whether the heating wire of the target phase is blown or not, and the method can cause the value of the judgment factor to change when part of the heating wire of a certain heating unit is just blown, so that the early detection and processing can be realized, the real electric arc generated by the whole blowing of the heating wire of the heating unit can be avoided, and the method has the function of pre-alarming for the electric arc detection.
And step S210, judging whether the value of the judgment factor meets a preset value or not, and if so, generating an alarm signal.
In the embodiment of the invention, if the value of the judgment factor meets the preset value, the system generates an alarm signal, and the alarm signal is output by adopting one or more modes such as sound, light, electricity and the like. Preferably, in the embodiment of the present invention, the value of the determination factor is compared with a preset value k to determine whether the target phase electric heating wire is full of electric heating wires to generate an alarm signal, where k is determined according to the resistance value of the target phase electric heating wire, for example, electric heating wires with the same resistance value are used in a certain phase, when any electric heating wire is disconnected, the change rate of the target phase total resistance is j, and at this time, k may take a value slightly smaller than j. It should be further understood that the target phase herein refers to any one of the three phases. In the embodiment of the present invention, unless otherwise specified, the phase a is taken as an example for description, and the remaining B, C phases may be determined in the same manner.
The arc detection method provided by the embodiment of the invention determines the value of the judgment factor of the target phase by acquiring the three-phase current and the voltage, determines whether the danger of generating the arc exists and generates a corresponding alarm signal by comparing whether the value of the judgment factor of any phase meets the preset value, so that the problems of false alarm, missing alarm and the like existing in the prior art by a simple electric parameter operation or image acquisition mode are avoided, and the method can send out an alarm before the arc is generated when the electric heating wire is fused, so that the method has an early warning effect; in addition, the determination of the judgment factor value in the method provided by the invention also refers to three-phase standard current and three-phase standard voltage, so that false alarm caused by power grid voltage fluctuation and heating wire resistance value manufacturing errors can be avoided, and the reliability of system alarm is improved.
In an embodiment, as shown in fig. 3, the determining the three-phase corrected voltage according to the three-phase voltage and the preset three-phase standard voltage in step S204 may specifically include steps S302 to S304:
and step S302, determining the average value of the three-phase standard voltage.
In the embodiment of the invention, as a preferable scheme, the total resistance value of each phase in the three phases is the same, the grid voltage also keeps a rated value, but actually, the voltage and the resistance value have certain deviation, so that the current of the three phases under a normal working state also deviates from the rated value, and the influence caused by the imbalance of the system can be corrected and eliminated by recording the voltage value of the three phases under the normal working state, so that the accuracy of the system is improved. In the embodiment of the invention, the average value of the three-phase standard voltage can be U0And (4) showing.
And step S304, subtracting the standard voltage of the target phase from the acquired real-time voltage of the target phase, and adding the average value of the three-phase standard voltage to obtain the corrected voltage of the target phase.
In the embodiment of the present invention, the target phase correction voltage may be represented as Ua1The collected voltage of the target phase can be represented as Ua0Then U isa1＝Ua-Ua0+U0。
The arc detection method provided by the embodiment of the invention modifies the three-phase voltage through the three-phase standard voltage, can eliminate the influence of accidental voltage fluctuation caused by instability of a power grid on detection, and can prevent false alarm.
In one embodiment, the three-phase standard voltage is obtained by the following steps:
and under the normal working state of the system, when the difference value between the power supply voltage and the rated voltage of the power grid is smaller than a preset value, acquiring the power supply voltage at the moment as the three-phase standard voltage.
In the embodiment of the invention, the three-phase standard voltage average value can be represented as U0＝(Ua0+Ub0+Uc0) 3, performing the following steps; wherein, Ua0For the standard voltage value of the A phase, U can be understood similarlyb0And Uc0The embodiment of the present invention will not be described in detail.
In an embodiment, as shown in fig. 4, the determining the three-phase corrected current according to the three-phase current and the preset three-phase standard current in step S204 may specifically include steps S402 to S404:
step S402, determining the average value of the three-phase standard current.
In the embodiment of the invention, as a preferable scheme, the total resistance of each of the three phases is the same, but actually, the resistance has a certain deviation, so that the current of the three phases under a normal working state also deviates from a rated value, and the influence caused by the resistance error can be corrected and eliminated by recording the current value of the three phases under the normal working state, thereby improving the accuracy of the system. In the embodiment of the invention, the average value of the three-phase standard current can be I 0And (4) showing.
And S404, subtracting the standard current of the target phase from the acquired real-time current of the target phase, and adding the average value of the three-phase standard current to obtain the corrected current of the target phase.
In an embodiment of the present invention, the target phase correction current may be represented as Ia1The collected current of the target phase can be represented as Ia0Then I isa1＝Ia-Ia0+I0。
The arc detection method provided by the embodiment of the invention modifies the three-phase current through the three-phase standard current, so that the influence of resistance value errors of the electric heating wire on detection can be reduced or eliminated, and false alarm can be prevented.
In one embodiment, the three-phase standard current is obtained by:
and under the normal working state of the system, acquiring each phase of current as the three-phase standard current while acquiring the standard voltage.
In one embodiment, the equilibrium voltage between any two phases is determined by:
the balance voltage between any two phases is equal to the sum of the standard voltages of the two corresponding phases/2;
the equilibrium current between any two phases is determined by:
the balance current between any two phases is equal to the sum of the standard currents of the corresponding two phases/2.
In the embodiment of the present invention, U is an example of a balanced voltage between B, C phases bc＝(Ua1+Ub1) 2; similarly, take the equilibrium current between B, C phases as an example, Ibc＝(Ia1+Ib1)/2。
In one embodiment, the value of the target phase current decision factor is determined by:
the value of the target phase determination factor is equal to the target phase correction voltage/the balance voltage between the two phases other than the target phase-2/the target phase correction current/the balance current between the two phases other than the target phase + 1.
In the embodiment of the invention, the value of the A-phase judgment factor is taken as an example
ΔA＝Ua1/Ubc-2*Ia1/Ibc+1。
The arc detection method provided by the embodiment of the invention determines whether the danger of generating the arc exists and generates the corresponding alarm signal by comparing whether the value of the judgment factor of any phase meets the preset value, so that the problems of false alarm, missing alarm and the like existing in the prior art through a simple electric parameter operation or image acquisition mode are avoided, and the method can give an alarm before the electric arc is generated when the electric heating wire is fused, so that the method has an early warning effect.
As shown in fig. 5, in an embodiment, an arc detection apparatus is provided, which may be integrated in the computer device 120, and specifically may include:
the acquisition module 501 is used for acquiring three-phase voltage and three-phase current of the heating device in real time;
The correction module 502 is configured to determine a three-phase correction voltage according to the three-phase voltage and a preset three-phase standard voltage, and determine a three-phase correction current according to the three-phase current and a preset three-phase standard current;
the balance operation module 503 is configured to determine a balance voltage between any two phases according to the three-phase correction voltage, and determine a balance current between any two phases according to the three-phase correction current;
a decision factor operation module 504, configured to determine a value of a target phase decision factor according to the correction voltage and the correction current of the target phase, and the balance voltage and the balance current between the two remaining phases except the target phase;
and an alarm module 505, configured to determine whether the value of the determination factor meets a preset value, and if so, generate an alarm signal.
In the embodiment of the present invention, for the description and the explanation of the workflow of each module, reference may be made to any one or a combination of multiple embodiments described above, and details of the embodiment of the present invention are not described herein again.
The arc detection method provided by the embodiment of the invention determines whether the danger of generating the arc exists and generates a corresponding alarm signal by comparing whether the value of the judgment factor of any phase meets the preset value, so that the problems of false alarm, missed alarm and the like existing in the prior art by a simple electric parameter operation or image acquisition mode are avoided, and the method can give out an alarm before the arc is generated when the electric heating wire is fused, so that the method has an early warning effect; in addition, the determination of the judgment factor of the method provided by the invention also refers to three-phase standard current and three-phase standard voltage, so that false alarm caused by power grid voltage fluctuation or resistance value error of the electric heating wire can be avoided, and the reliability of system alarm is improved.
In one embodiment, the present invention also provides a regenerative electric heating system comprising:
the heating execution module is used for heating the medium;
and the control module is electrically connected with the heating execution module, is used for controlling the work of the heating execution module and monitoring the electric arc of the heating execution module by operating the electric arc detection method of any one embodiment of the invention.
In the embodiment of the present invention, preferably, the heating execution module is connected in a star shape, each of the heating execution modules is connected in series with a plurality of heating wire units, and each of the heating wire units includes at least two heating wires arranged in parallel. Furthermore, each phase is provided with a voltage acquisition device and a current acquisition device, and the voltage acquisition device and the current acquisition device are electrically connected with the control module. The control module executes the arc detection method provided by the combination of any one or more of the above embodiments of the present invention by collecting the three-phase current and the three-phase voltage to realize the arc detection and alarm of the heating execution module.
The heat storage type electric heating system provided by the embodiment of the invention carries out work control and arc detection on the heating execution module by arranging the control module, the arc detection method provided by the embodiment of the invention determines the value of the judgment factor of a target phase by acquiring three-phase current and voltage, and determines whether the danger of generating the arc exists and generates a corresponding alarm signal by comparing whether the value of the judgment factor of any phase meets a preset value, so that the problems of false alarm, missing alarm and the like existing in the prior art by a simple electric parameter operation or image acquisition mode are avoided, and the method can give an alarm before the electric arc is generated when the electric heating wire is fused, so that the early warning effect is achieved; in addition, the determination of the judgment factor of the method provided by the invention also refers to three-phase standard current and three-phase standard voltage, so that false alarm caused by power grid voltage fluctuation or resistance value error of the electric heating wire can be avoided, and the reliability of system alarm is improved.
FIG. 6 is a diagram illustrating an internal structure of a computer device in one embodiment. The computer device may specifically be the control component 200 in fig. 1. As shown in fig. 6, the computer apparatus includes a processor, a memory, a network interface, an input device, and a display screen connected through a system bus. Wherein the memory includes a non-volatile storage medium and an internal memory. The non-volatile storage medium of the computer device stores an operating system, and may further store a computer program, and when the computer program is executed by the processor, the computer program may cause the processor to implement the arc detection method provided by the embodiment of the present invention. The internal memory may also store a computer program, which when executed by the processor, causes the processor to perform the arc detection method provided by the embodiments of the present invention. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
Those skilled in the art will appreciate that the architecture shown in fig. 6 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, the arc detection apparatus provided herein may be implemented in the form of a computer program that is executable on a computer device such as that shown in fig. 6. The memory of the computer device may store various program modules constituting the arc detection apparatus, such as an acquisition module, a correction module, a balance operation module, a decision factor operation module, and an alarm module shown in fig. 5. The respective program modules constitute computer programs that cause the processor to execute the steps in the arc detection methods of the various embodiments of the present application described in the present specification.
For example, the computer device shown in fig. 6 may execute step S202 through the acquisition module in the arc detection apparatus shown in fig. 5; the computer device may execute step S204 through the modification module; the computer device may execute step S206 through the balance operation module; the computer device may perform step S208 through the decision factor operation module; the computer device may perform step S210 through the alarm module.
In one embodiment, a computer device is proposed, the computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the following steps when executing the computer program:
Collecting three-phase voltage and three-phase current of a heating device in real time;
determining a three-phase correction voltage according to the three-phase voltage and a preset three-phase standard voltage, and determining a three-phase correction current according to the three-phase current and a preset three-phase standard current;
determining a balance voltage between any two phases according to the three-phase correction voltage, and determining a balance current between any two phases according to the three-phase correction current;
determining the value of a target phase determination factor according to the correction voltage and the correction current of the target phase, and the balance voltage and the balance current between the two phases except the target phase;
and judging whether the value of the judgment factor meets a preset value or not, and if so, generating an alarm signal.
In one embodiment, a computer readable storage medium is provided, having a computer program stored thereon, which, when executed by a processor, causes the processor to perform the steps of:
acquiring three-phase voltage and three-phase current of a heating device in real time;
determining a three-phase correction voltage according to the three-phase voltage and a preset three-phase standard voltage, and determining a three-phase correction current according to the three-phase current and a preset three-phase standard current;
Determining a balance voltage between any two phases according to the three-phase correction voltage, and determining a balance current between any two phases according to the three-phase correction current;
determining the value of a target phase determination factor according to the correction voltage and the correction current of the target phase, and the balance voltage and the balance current between the two phases except the target phase;
and judging whether the value of the judgment factor meets a preset value or not, and if so, generating an alarm signal.
It should be understood that, although the steps in the flowcharts of the embodiments of the present invention are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in various embodiments may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a non-volatile computer-readable storage medium, and can include the processes of the embodiments of the methods described above when the program is executed. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include non-volatile and/or volatile memory. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the present invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (10)
1. An arc detection method, characterized in that it comprises the steps of:
collecting three-phase voltage and three-phase current of a heating device in real time;
determining a three-phase correction voltage according to the three-phase voltage and a preset three-phase standard voltage, and determining a three-phase correction current according to the three-phase current and a preset three-phase standard current;
Determining a balance voltage between any two phases according to the three-phase correction voltage, and determining a balance current between any two phases according to the three-phase correction current;
determining the value of a target phase judgment factor according to the correction voltage and the correction current of the target phase and the balance voltage and the balance current between the two phases except the target phase;
judging whether the value of the judgment factor meets a preset value or not, and if so, generating an alarm signal;
the three-phase correction voltage = the mean value of the real-time voltage of the target phase-the standard voltage of the target phase + the standard voltage of the three phases;
the three-phase corrected current = the mean value of the target phase real-time current-the target phase standard current + the three-phase standard current;
the value of the target phase determination factor = target phase correction voltage/mean value of correction voltages of two other phases-2 × target phase correction current/mean value of correction currents of two other phases + 1.
2. The arc detection method according to claim 1, wherein the determining a three-phase correction voltage according to the three-phase voltage and a preset three-phase standard voltage comprises the following steps:
determining an average value of the three-phase standard voltages;
and subtracting the standard voltage of the target phase from the acquired real-time voltage of the target phase and adding the average value of the three-phase standard voltage to obtain the corrected voltage of the target phase.
3. The arc detection method of claim 2, wherein the three-phase standard voltage is obtained by:
and under the normal working state of the system, when the difference value between the power supply voltage and the rated voltage of the power grid is smaller than a preset value, acquiring the power supply voltage at the moment as the three-phase standard voltage.
4. The arc detection method according to claim 1, wherein the determining a three-phase corrected current according to the three-phase current and a preset three-phase standard current comprises the following steps:
determining an average value of the three-phase standard current;
and subtracting the standard current of the target phase from the acquired real-time current of the target phase, and adding the average value of the three-phase standard current to obtain the corrected current of the target phase.
5. The arc detection method of claim 4, wherein the three-phase standard current is obtained by:
and under the normal working state of the system, acquiring each phase of current as the three-phase standard current while acquiring the standard voltage.
6. The arc detection method of claim 1 wherein the equilibrium voltage between any two phases is determined by:
the balance voltage between any two phases = the sum of the correction voltages of the corresponding two phases/2;
The equilibrium current between any two phases is determined by:
balance current between any two phases = the sum/2 of the correction currents of the corresponding two phases.
7. The arc detection method according to claim 1, wherein the value of the target phase determination factor is determined by:
the value of the target phase determination factor = target phase correction voltage/balance voltage between the two remaining phases other than the target phase-2 × target phase correction current/balance current between the two remaining phases other than the target phase + 1.
8. An arc detection device, characterized in that the arc detection device comprises:
the acquisition module is used for acquiring three-phase voltage and three-phase current of the heating device in real time;
the correction module is used for determining three-phase correction voltage according to the three-phase voltage and preset three-phase standard voltage and determining three-phase correction current according to the three-phase current and preset three-phase standard current;
the balance operation module is used for determining the balance voltage between any two phases according to the three-phase correction voltage and determining the balance current between any two phases according to the three-phase correction current;
the judgment factor operation module is used for determining the value of a target phase judgment factor according to the correction voltage and the correction current of the target phase and the balance voltage and the balance current between the two phases except the target phase;
The alarm module is used for judging whether the value of the judgment factor meets a preset value or not, and if so, generating an alarm signal;
the three-phase correction voltage = a mean value of a target phase real-time voltage-a target phase standard voltage + a three-phase standard voltage;
the three-phase correction current = target phase real-time current-target phase standard current + mean value of three-phase standard current;
the value of the target phase determination factor = target phase correction voltage/mean value of correction voltages of the other two phases-2 × target phase correction current/mean value of correction currents of the other two phases + 1.
9. A regenerative electric heating system, comprising:
the heating execution module is used for heating the medium;
a control module electrically connected with the heating execution module for controlling the operation of the heating execution module and performing arc monitoring on the heating execution module by operating the arc detection method according to any one of claims 1 to 7.
10. The regenerative electric heating system according to claim 9, wherein the heating performing modules are connected in a star shape, each phase has a plurality of heating wire units connected in series, and each heating wire unit includes at least two heating wires arranged in parallel.
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