CN110887993A - Power harmonic detection and treatment analysis method and device - Google Patents
Power harmonic detection and treatment analysis method and device Download PDFInfo
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- CN110887993A CN110887993A CN201911115342.7A CN201911115342A CN110887993A CN 110887993 A CN110887993 A CN 110887993A CN 201911115342 A CN201911115342 A CN 201911115342A CN 110887993 A CN110887993 A CN 110887993A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention discloses a method and a system for detecting, analyzing and governing power harmonic waves. The method comprises the following steps: s1, acquiring a voltage value, a current value, a voltage total harmonic distortion rate, a current harmonic total distortion rate, a fundamental wave and each harmonic current distortion rate at a harmonic detection point; s2, judging whether the total harmonic distortion rate of the voltage is greater than a standard value, if so, judging that the harmonic exceeds the standard; s3, calculating the current value of each subharmonic of the detection line according to the current value and the distortion rate of each subharmonic current obtained in the step S1: each harmonic current is equal to current distortion rate multiplied by current value; s4, obtaining each subharmonic current allowable value of the corresponding measuring point by using a current harmonic correction formula according to the minimum short circuit capacity and the reference short circuit capacity of the common connecting point; s5, comparing the allowed value of each harmonic current with the current value of each harmonic current, and analyzing the overproof of the current harmonic. The method helps enterprises to identify the harmonic waves and give effective treatment measures, and potential hidden dangers are eliminated.
Description
Technical Field
The invention belongs to the field of electric power, and particularly relates to a method and a device for detecting and governing and analyzing electric power harmonic waves.
Background
It is known that the harm of harmonic waves is small enough to influence the use efficiency of electric energy, reduce the service life of equipment and cause serious electrical fire, so that the harmonic waves of buses with potential harmonic waves are detected and treated, and the harmonic waves are important. Most of the existing schemes and technologies focus on the design of harmonic detection circuit systems, and aim to accurately measure harmonics and reduce the cost of measuring instruments. The harmonic detection and identification are not analyzed in an overproof condition, calculation, comparison and analysis are manually carried out, and then a treatment scheme is designed.
With the rapid development of the social industry and the continuous improvement of the living standard of human beings, various nonlinear loads and flushing devices such as motors, rectifying devices, frequency conversion devices and electric arc furnaces are connected into an electric power system, a large amount of harmonic waves are injected into a local power distribution network or a large power grid of an enterprise, the harmonic waves reduce the power utilization efficiency, reduce the service life of the device, cause the occurrence of electric fire under severe conditions and bring huge loss to the production of the enterprise, and therefore, the detection and the corresponding treatment of the harmonic waves of the electric power system are very important.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: for the power harmonic pollution of the power system, most of the existing schemes and technologies focus on the design of harmonic detection circuit systems and the design of treatment equipment circuits, namely the design of detection instruments and harmonic treatment devices. The harmonic detection and identification are not analyzed in an overproof condition, and manual calculation, comparison and analysis are needed to design a treatment scheme.
In order to solve the technical problem, the method for detecting, analyzing and governing the power harmonic wave comprises the following steps:
s1, acquiring a voltage value, a current value, a voltage total harmonic distortion rate, a current harmonic total distortion rate, a fundamental wave and each harmonic current distortion rate at a harmonic detection point;
s2, judging whether the total harmonic distortion rate of the voltage is greater than a standard value, if so, judging that the harmonic exceeds the standard;
s3, calculating the current value of each subharmonic of the detection line according to the current value and the distortion rate of each subharmonic current obtained in the step S1: each harmonic current is equal to current distortion rate multiplied by current value;
s4, obtaining each subharmonic current allowable value of the corresponding measuring point by using a current harmonic correction formula according to the minimum short circuit capacity and the reference short circuit capacity of the common connecting point;
the current harmonic correction formula is as follows: ih Sk1 × Ihp/Sk2
Wherein, Ih is the h-th harmonic current allowable value when the short-circuit capacity is Sk1, Ihp is the h-th harmonic current allowable value, Sk1 is the minimum short-circuit capacity of the common connection point, and Sk2 is the reference short-circuit capacity;
s5, comparing the allowable value of each harmonic current in the step S4 with the current value of each harmonic current in the step S3, and analyzing the overproof current harmonics:
when the harmonic current value is more than 2 times of the corresponding allowable harmonic current value, judging that the subharmonic current value exceeds the standard seriously; when the serious superscalar is more than three times, an active filter device is adopted for treatment;
otherwise, a passive filter device is adopted for treatment.
Further, in step S5, the installation capacity of the active filter device is determined according to the total harmonic current value; the capacitance and inductance installation capacity combination in the passive filter device is determined according to the harmonic current value which seriously exceeds the standard.
For low-voltage lines of 380V or less, the voltage value is a primary voltage value and the current value is a secondary current value in step S1.
For a high-voltage line of 10kV or more, the voltage is a secondary voltage value and the current is a secondary current value in step S1.
The invention also provides a system for detecting, analyzing and governing the power harmonic wave, which comprises the following components:
the measurement data acquisition module is used for acquiring a voltage value, a current value, a voltage total harmonic distortion rate, a current harmonic total distortion rate, a fundamental wave and each harmonic current distortion rate at a harmonic detection point;
the harmonic overproof judgment module judges whether the total harmonic distortion rate of the voltage is greater than a standard value, if so, the harmonic overproof judgment module judges that the harmonic is overproof;
the harmonic current calculation module is used for calculating the current value of each subharmonic of the detection circuit according to the current value and the distortion rate of each subharmonic current obtained by the measurement data acquisition module: each harmonic current is equal to current distortion rate multiplied by current value;
the harmonic current allowable value calculation module is used for obtaining each harmonic current allowable value of the corresponding measuring point by using a current harmonic correction formula according to the minimum short-circuit capacity and the reference short-circuit capacity of the public connecting point;
the current harmonic correction formula is as follows: ih Sk1 × Ihp/Sk2
Wherein, Ih is the h-th harmonic current allowable value when the short-circuit capacity is Sk1, Ihp is the h-th harmonic current allowable value, Sk1 is the minimum short-circuit capacity of the common connection point, and Sk2 is the reference short-circuit capacity;
and the harmonic overproof analysis and treatment module compares the allowable value of each harmonic current with the current value of each harmonic current to perform current harmonic overproof analysis:
when the harmonic current value is more than 2 times of the corresponding allowable harmonic current value, judging that the subharmonic current value exceeds the standard seriously; when the serious superscalar is more than three times, an active filter device is adopted for treatment;
otherwise, a passive filter device is adopted for treatment.
And for low-voltage lines below 380V, the measurement data acquisition module acquires primary voltage values and secondary current data.
And for a high-voltage line of more than 10kV, the measurement data acquisition module acquires a secondary voltage value and a secondary current value.
The installation capacity of the active filter device is determined according to the total harmonic current value; the capacitance and inductance installation capacity combination in the passive filter device is determined according to the harmonic current value which seriously exceeds the standard.
The invention also provides a computer readable storage medium, which comprises an execution instruction, and when a processor of the electronic equipment executes the execution instruction, the processor executes the method for detecting and analyzing the power harmonic wave.
The invention also provides electronic equipment which comprises a processor and a memory, wherein the memory is used for storing execution instructions, and when the processor executes the execution instructions stored in the memory, the processor executes the method for detecting, analyzing and governing the power harmonic wave.
The invention relates to a method and a system for detecting and analyzing power harmonic waves, which mainly perform harmonic wave detection on a potential harmonic wave bus, then perform overproof condition analysis and finally give treatment measures. The method has the advantages that detection, standard exceeding analysis and treatment measure suggestion are realized in a full-automatic mode, an enterprise is helped to identify harmonic waves, effective treatment measures are provided, and potential hidden dangers are eliminated.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a flow chart of the method for power harmonic detection and analysis and treatment of the present invention.
FIG. 2 is a schematic diagram of the power harmonic detection and analysis and treatment system of the present invention.
FIG. 3 is a schematic diagram of detecting point positions according to an embodiment of the present invention.
FIG. 4 is a graph of the total distortion rate of the harmonic voltage and the harmonic current according to an embodiment of the present invention.
FIG. 5 is a comparison graph of the harmonic test value of each current of 1# inductor of 1# casting furnace and the allowable value thereof according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of an apparatus 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.
Referring to fig. 1, the method for detecting, analyzing and treating power harmonics of the present invention includes the following steps:
s1, acquiring a voltage value (acquiring a primary voltage value for a low-voltage line below 380V; acquiring a secondary voltage value, a current value (secondary current value), a voltage total harmonic distortion rate, a current harmonic total distortion rate, a fundamental wave and each harmonic current distortion rate for a high-voltage line above 10 kV;
s2, judging whether the total harmonic distortion rate of the voltage is greater than a standard value, if so, judging that the harmonic exceeds the standard;
s3, calculating the current value of each subharmonic of the detection line according to the current value and the distortion rate of each subharmonic current obtained in the step S1: each harmonic current is equal to current distortion rate multiplied by current value;
s4, obtaining each subharmonic current allowable value of the corresponding measuring point by using a current harmonic correction formula according to the minimum short circuit capacity and the reference short circuit capacity of the common connecting point;
the current harmonic correction formula is as follows: ih Sk1 × Ihp/Sk2
Wherein, Ih is the h-th harmonic current allowable value when the short-circuit capacity is Sk1, Ihp is the h-th harmonic current allowable value, Sk1 is the minimum short-circuit capacity of the common connection point, and Sk2 is the reference short-circuit capacity;
s5, comparing the allowable value of each harmonic current in the step S4 with the current value of each harmonic current in the step S3, and analyzing the overproof current harmonics:
when the harmonic current value is more than 2 times of the corresponding allowable harmonic current value, judging that the subharmonic current value exceeds the standard seriously; when the serious superscalar is more than three times, an active filter device is adopted for treatment;
otherwise, a passive filter device is adopted for treatment.
That is, the mounting capacity of the active filter device is determined according to the value of the total harmonic current (thdi (a)); the capacitance and inductance installation capacity combination in the passive filter device is determined by certain harmonic current values (within 3 kinds, such as only 3, 5 harmonic waves are seriously exceeded) which are seriously exceeded. When multiple harmonics (more than 3, such as 3, 5, 7, 9 and above harmonics) all exceed standards seriously, an active filtering device is adopted for treatment.
Referring to fig. 2, the present invention further provides a power harmonic detection and analysis and treatment system, which includes:
the measurement data acquisition module 10 acquires a voltage value, a current value, a voltage total harmonic distortion rate, a current harmonic total distortion rate, a fundamental wave and each harmonic current distortion rate at the harmonic detection point. For a low-voltage line (380V or below), primary voltage is sampled by voltage sampling, and secondary current is sampled by current sampling; for high voltage lines (10kV and above), secondary voltage is taken as voltage sampling, and secondary current is taken as current sampling. The settings of voltage, current transformer transformation ratio, wiring form and the like in the sampling module are set according to the actual measuring point condition.
The harmonic exceeding judgment module 20 judges whether the total harmonic distortion of the voltage is greater than a standard value, and if so, judges that the harmonic exceeds the standard.
The harmonic current calculation module 30 calculates the current value of each harmonic in the detection line according to the current value and the distortion rate of each harmonic current obtained by the measurement data obtaining module: each harmonic current is equal to a current distortion rate × a current value.
The harmonic current allowable value calculation module 40 is used for obtaining each harmonic current allowable value of the corresponding measuring point by using a current harmonic correction formula according to the minimum short-circuit capacity and the reference short-circuit capacity of the public connecting point;
the current harmonic correction formula is as follows: ih Sk1 × Ihp/Sk2
Here, Ih is an h-th harmonic current allowable value when the short-circuit capacity is Sk1, Ihp is an h-th harmonic current allowable value, Sk1 is a minimum short-circuit capacity of the common connection point, and Sk2 is a reference short-circuit capacity.
Voltage harmonic standards under different voltage levels, current harmonic allowable values under reference short-circuit capacity and short-circuit capacity which can be input into a detection point need to be preset, so that the current harmonic allowable values of corresponding detection points can be obtained by using a current harmonic correction formula. The voltage harmonic standard under different voltage levels refers to the regulation of voltage harmonic limit values under different voltage levels in national standard GB/T14549-93 electric energy quality public power grid harmonic, as shown in the following table 1:
TABLE 1 Utility grid harmonic voltage (phase voltage) Limit
The allowable value of the current harmonic wave under the standard short-circuit capacity refers to the regulations of the national standard GB/T14549-93 'harmonic wave of electric energy quality public power grid' on the allowable value of the current harmonic wave under different voltage grades and different reference short-circuit capacities, and is shown in the following tables 2 and 3.
TABLE 2 allowable value of harmonic current injected into the point of common connection-1
TABLE 3 allowable value of harmonic current injected into the point of common connection-2
The current harmonic correction formula is as follows: i ish＝Sk1×Ihp/Sk2
Wherein, IhTo short circuit capacity of Sk1Allowable value of h-th harmonic current of time, IhpIs the h-th harmonic current allowable value, Sk1Is the minimum short-circuit capacity of the point of common connection, Sk2Is the reference short circuit capacity.
The allowable value of the harmonic current at the detection point needs to be corrected according to the minimum short-circuit capacity of the public connection point and the allowable value of the harmonic current injected into the public connection point in GB/T14549-93 electric energy quality public power grid harmonic and a correction formula, so that the allowable value of each harmonic current at the detection point is obtained.
The harmonic overproof analysis and treatment module 50 compares the allowable value (harmonic standard value) of each harmonic current with the current value (actual measurement value) of each harmonic current, and performs current harmonic overproof analysis:
when the harmonic current value is more than 2 times of the corresponding allowable harmonic current value, judging that the subharmonic current value exceeds the standard seriously; when the serious superscalar is more than three times, an active filter device is adopted for treatment;
otherwise, a passive filter device is adopted for treatment.
The invention is further illustrated by the following specific examples:
the zinc casting furnace of a certain enterprise is an intermediate frequency furnace, three-phase power frequency alternating current is rectified and inverted to obtain single-phase non-power frequency alternating current, and a large amount of harmonic waves are brought by thyristor and other switching elements adopted in the rectifying and inverting processes. 2 times of tripping and power-off accidents happen when the zinc casting furnace runs, and are suspected to be caused by harmonic waves. Thus, the harmonic wave of the casting furnace is detected.
The measurement data acquisition module 10 performs voltage and current sampling: and sampling the voltage and the current at the harmonic detection point. The detection object is a No. 1 zinc casting furnace, the test point is a 380V incoming line switch cabinet (10/0.4kV transformer outgoing line, rectifier incoming line side) of a No. 1 inductor, and the casting furnace normally operates during the test. The detection point positions are shown in fig. 3. The detection point is a low-voltage line (380V or below), the voltage is primary voltage, the current is secondary current, and the voltage transformation ratio in the sampling module is 1, the current transformation ratio in the sampling module is 120, and the connection form is star-shaped.
Harmonic current calculation module 30: and detecting and calculating the actual conditions of the harmonic voltage and the harmonic current of the measured circuit according to the acquired voltage and current signals. The measurement data acquisition module is used for measuring the waveforms of the total harmonic distortion of the voltage and the current as shown in fig. 4.
It can be seen from the above that when the harmonic value fluctuates frequently, which may be the time of adjusting the load of the electric furnace, overall, the total harmonic voltage distortion rate THD-u is about 13%, and the total harmonic current distortion rate THD-i is about 33%.
The current harmonic values of the respective orders are shown in Table 4, and the 25 th order current harmonic was analyzed.
TABLE 41 # founding furnace 1# inductor each current harmonic wave test value table (Unit: A)
Harmonic current allowable value calculation module 40: the harmonic standard exceeding analysis module needs to be pre-embedded with voltage harmonic standards under different voltage levels, current harmonic allowable values under reference short-circuit capacity and short-circuit capacity capable of being input into a detection point, so that the current harmonic allowable values of corresponding detection points can be obtained by using a current harmonic correction formula. And comparing the harmonic standard value with an actual measured value, and performing harmonic standard exceeding analysis.
According to GB/T14549-93 electric energy quality public power grid harmonic wave, the total harmonic distortion rate under 380V voltage level should not exceed 5%, and the measured total harmonic voltage distortion rate THD-u is about 13% and seriously exceeds the standard.
The judgment and analysis of the harmonic current need to calculate the allowable value of the harmonic current which is in line with the actual field situation according to the allowable value of the harmonic current injected into the public connection point, the short-circuit capacity of the measurement point and a correction formula which correspond to the reference short-circuit capacity of 10MVA of 380V voltage level in the national standard GB/T14549-93 electric energy quality public power grid harmonic, and then compare the allowable value with the actual measurement value, so as to judge the current situation of the harmonic current, and the data calculation result is shown in table 5 and fig. 4.
TABLE 51 # founding furnace 1# inductor harmonic current and its allowable value table (Unit: A)
As can be seen from Table 5 or FIG. 5, the odd harmonics 3-25 times are almost out of standard, especially 3, 5, and 7 times are the most serious.
Harmonic overproof analysis and treatment module 50: according to the analysis of the harmonic overproof analysis module on the overproof result, a device configuration scheme proposal for harmonic treatment is given, and the proposal can be a passive filtering scheme or an active filtering scheme and is determined according to specific conditions.
From the analysis of the harmonic overproof analysis module on the overproof result, the voltage harmonic of the 1# inductor of the 1# casting furnace seriously overproof, and the odd harmonic in the current harmonic almost exceeds 3-25 times, particularly 3 times, 5 times and 7 times. Since odd harmonics all exceed the standard for many times, in order to completely filter out harmonic currents, an active filtering scheme must be configured, and according to the tested THDi (A) being 525A, the configuration proposal of the active filtering device is shown in the following table 6.
Table 6 harmonic wave treatment configuration equipment parameter table
Fig. 6 is a schematic structural diagram of an apparatus for a method of power harmonic detection and analysis abatement according to an embodiment of the present invention. On the hardware level, the server includes a processor 701 and a memory 702 storing execution instructions, and optionally an internal bus 703 and a network interface 704. The Memory 702 may include a Memory 7021, such as a Random-Access Memory (RAM), and may further include a non-volatile Memory 7022 (e.g., at least 1 disk Memory); the processor 701, the network interface 704, and the memory 702 may be connected to each other by an internal bus 703, and the internal bus 703 may be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, an EISA (Extended Industry Standard Architecture) bus, or the like; the internal bus 703 may be divided into an address bus, a data bus, a control bus, etc., and is indicated by a double-headed arrow in fig. 6 for convenience of illustration, but does not indicate only one bus or one type of bus. Of course, the server may also include hardware needed for other services. When the processor 701 executes the execution instructions stored in the memory 702, the processor 701 executes the method described in any of the embodiments of the present invention, and at least is configured to: in a possible implementation mode, the processor reads corresponding execution instructions from the nonvolatile memory to the memory and then runs the corresponding execution instructions, and corresponding execution instructions can also be obtained from other equipment, so that the device of the method for detecting and analyzing the power harmonic wave is formed on a logic level. The processor executes the execution instruction stored in the memory, so that the method for detecting and analyzing the power harmonic wave provided by any embodiment of the invention is realized through the executed execution instruction.
The processor may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The Processor may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but also Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The embodiment of the invention also provides a computer-readable storage medium, which comprises an execution instruction, and when a processor of the electronic device executes the execution instruction, the electronic device executes the method provided in any embodiment of the invention. The electronic device may be specifically a device as shown in the method for detecting and analyzing the power harmonic in fig. 6; the method for executing the instructions to obtain the optimized trading scheme of the microgrid is a corresponding computer program.
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, for the system embodiment, since it is substantially similar to the method embodiment, the description is 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 apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus 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 (10)
1. A method for detecting, analyzing and governing power harmonic waves is characterized by comprising the following steps:
s1, acquiring a voltage value, a current value, a voltage total harmonic distortion rate, a current harmonic total distortion rate, a fundamental wave and each harmonic current distortion rate at a harmonic detection point;
s2, judging whether the total harmonic distortion rate of the voltage is greater than a standard value, if so, judging that the harmonic exceeds the standard, otherwise, ending;
s3, calculating the current value of each subharmonic of the detection line according to the current value and the distortion rate of each subharmonic current obtained in the step S1: each harmonic current is equal to current distortion rate multiplied by current value;
s4, obtaining each subharmonic current allowable value of the corresponding measuring point by using a current harmonic correction formula according to the minimum short circuit capacity and the reference short circuit capacity of the common connecting point;
the current harmonic correction formula is as follows: ih Sk1 × Ihp/Sk2
Wherein, Ih is the h-th harmonic current allowable value when the short-circuit capacity is Sk1, Ihp is the h-th harmonic current allowable value, Sk1 is the minimum short-circuit capacity of the common connection point, and Sk2 is the reference short-circuit capacity;
s5, comparing the allowable value of each harmonic current in the step S4 with the current value of each harmonic current in the step S3, and analyzing the overproof current harmonics:
when the harmonic current value is more than 2 times of the corresponding allowable harmonic current value, judging that the subharmonic current value exceeds the standard seriously; when the serious superscalar is more than three times, an active filter device is adopted for treatment;
otherwise, a passive filter device is adopted for treatment.
2. The method for power harmonic detection and analysis and treatment according to claim 1, wherein in step S5, the installation capacity of the active filter device is determined according to the total harmonic current value; the capacitance and inductance installation capacity combination in the passive filter device is determined according to the harmonic current value which seriously exceeds the standard.
3. The method according to claim 1, wherein the voltage value in step S1 is a primary voltage value and the current value is a secondary current value for low-voltage lines below 380V.
4. The method for power harmonic detection and analysis and treatment according to claim 1, wherein, for a high voltage line of 10kV or more, the voltage in step S1 is a secondary voltage value, and the current is a secondary current value.
5. A system for power harmonic detection and analysis governance, comprising:
the measurement data acquisition module is used for acquiring a voltage value, a current value, a voltage total harmonic distortion rate, a current harmonic total distortion rate, a fundamental wave and each harmonic current distortion rate at a harmonic detection point;
the harmonic overproof judgment module judges whether the total harmonic distortion rate of the voltage is greater than a standard value, if so, the harmonic overproof judgment module judges that the harmonic is overproof;
the harmonic current calculation module is used for calculating the current value of each subharmonic of the detection circuit according to the current value and the distortion rate of each subharmonic current obtained by the measurement data acquisition module: each harmonic current is equal to current distortion rate multiplied by current value;
the harmonic current allowable value calculation module is used for obtaining each harmonic current allowable value of the corresponding measuring point by using a current harmonic correction formula according to the minimum short-circuit capacity and the reference short-circuit capacity of the public connecting point;
the current harmonic correction formula is as follows: ih Sk1 × Ihp/Sk2
Wherein, Ih is the h-th harmonic current allowable value when the short-circuit capacity is Sk1, Ihp is the h-th harmonic current allowable value, Sk1 is the minimum short-circuit capacity of the common connection point, and Sk2 is the reference short-circuit capacity;
and the harmonic overproof analysis and treatment module compares the allowable value of each harmonic current with the current value of each harmonic current to perform current harmonic overproof analysis:
when the harmonic current value is more than 2 times of the corresponding allowable harmonic current value, judging that the subharmonic current value exceeds the standard seriously; when the serious superscalar is more than three times, an active filter device is adopted for treatment;
otherwise, a passive filter device is adopted for treatment.
6. The system for power harmonic detection and analysis and treatment according to claim 5, wherein the measurement data acquisition module acquires primary voltage values and secondary current data for low voltage lines below 380V.
7. The system for power harmonic detection and analysis and treatment according to claim 5, wherein the measurement data acquisition module acquires a secondary voltage value and a secondary current value for a high-voltage line of 10kV or more.
8. The system for power harmonic detection and analysis abatement of claim 5, wherein the installation capacity of the active filtering means is determined from the total harmonic current value; the capacitance and inductance installation capacity combination in the passive filter device is determined according to the harmonic current value which seriously exceeds the standard.
9. A computer-readable storage medium comprising executable instructions that, when executed by a processor of an electronic device, cause the processor to perform the method of any of claims 1-4.
10. An electronic device comprising a processor and a memory storing execution instructions, the processor performing the method of any of claims 1-4 when the processor executes the execution instructions stored by the memory.
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| CN114336595A (en) * | 2021-12-03 | 2022-04-12 | 广东电网有限责任公司汕头供电局 | Capacitor harmonic evaluation method and monitoring device based on actually measured short-circuit capacity |
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