CN102798758B  Method and system for measuring series reactance rate of shunt capacitor bank  Google Patents
Method and system for measuring series reactance rate of shunt capacitor bank Download PDFInfo
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 CN102798758B CN102798758B CN201210324378.8A CN201210324378A CN102798758B CN 102798758 B CN102798758 B CN 102798758B CN 201210324378 A CN201210324378 A CN 201210324378A CN 102798758 B CN102798758 B CN 102798758B
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Abstract
The invention discloses a method and a system for measuring the series reactance rate of a shunt capacitor bank. The method comprises the following steps of: carrying out harmonic monitoring on the shunt capacitor bank; acquiring a voltage value and a current value of each subharmonic according to original data acquired by harmonic monitoring; and determining the reactance rate according to the voltage value and the current value of each subharmonic. According to the method and the system disclosed by the invention, monitoring data of the harmonic are used as a data foundation and no special reactance rate measuring equipment is required, and thus the investment cost is saved to the maximum extent; in addition, the method and the system can carry out harmonic monitoring during system running without influencing normal running of the system and a monitoring result meets the requirements of realtime property, completeness and accuracy; whether the magnitude of the series reactance rate of the shunt capacitor bank in an actual running state meets the design requirement and the amplification of the harmonic can be effectively suppressed or not can be monitored accurately and effectively; and through popularization and application of the method and the system, the safe and reliable running of the shun capacitor bank is ensured and the reliability of a traditional power grid is enhanced.
Description
Technical field
The present invention relates to power quality analysis field, particularly a kind of measuring method of the Substation Parallel Capacitor group series reactors based on Detecting Power Harmonics and system.
Background technology
Parallel condenser compensation device is widely used in electric system due to reasons such as combined capacity is flexible, installation and maintenance are easy, small investments.According to statistics, national capacitive means total volume accounts for 98% of capacitive compensation capacity, becomes the main power source of var, for the pressure regulation of electric system phase modulation, safe and stable operation, improves the quality of power supply and wastage reducing and energy saving has effect of crucial importance.Along with developing rapidly of electric utility, capacitive means installation and operation capacity also increases rapidly.The continuous growth of the nonlinearloads such as simultaneous fairing, electric railway, electric arc furnaces, the widespread use of power electronic devices, and the putting into operation successively of HVDC (High Voltage Direct Current) transmission system, make electrical network be subject to harmonic pollution increasingly severe.But capacitive means (parallel condenser compensation device) is capacitive load, its access changes the harmonic impedance characteristic of electrical network, when do not take measures or improper measures, be amplification to higher hamonic wave, also can there is resonance once parameter matching, make capacitive means even burnt by major injury with electric equipment contiguous in the electrical network that is connected.Practice shows, by suitable reactor of connecting, can effectively prevent capacitor Harmonic Amplification Problem.Following regulation is made in the design alternative of standard GB/T 5022795 " (Code for design of installation of shunt capacitors " series reactors: " for harmonic inhabitation; when the background harmonics at parallel capacitor device access electrical network place be 5 times and above time, should 4.5%6% be got; When parallel capacitor device access electrical network place background harmonics be 3 times and above time, should 12% be got; Also 4.5%6% and 12% two kind of reactance Rate can be adopted.”
But find in the longtime running of electrical network, the reactor that the reason due to following two aspects makes parallel capacitor device connect can not effectively limit value mains by harmonics amplification, prevent the generation of resonance:
(1) operating magnetic field flux density unshakable in one's determination of some currentlimiting reactors unshakable in one's determination is chosen too high, makes to make operating reactance value on the low side in reactor actual motion due to iron core cutter; With the device of constant reactance device, fall because the needs of reactiveload compensation or partial capacitor fault exit to hold and run, make actual motion reactance Rate less than normal.
(2) select reactor reactance Rate inconsistent with design reactance Rate during actual type selecting.Reactance Rate is replaced with reactor and the ratio of the rated capacity of capacitor simply during lectotype selection design, and in fact reactance Rate and volume ratio are inversely proportional to and change, what have chooses the larger reactor of the aforementioned calculating of volume ratio when type selecting, also take for and be increased reactance Rate, feel, than more harmonic wave " can be suppressed " in the past, in fact may deviate from former design load out and away.Select the induction reactance value of the reactor must determined according to the percentage value of capacitive reactance during reactor to select actual product.
Summary of the invention
The object of the present invention is to provide a kind of measuring method and system of Shunt Capacitor Unit series reactors, series reactors size when it can determine that capacitor is in actual motion state quickly and accurately, to ensure the safe and reliable operation of Capacitor banks, small investment, easy to operate.
Object of the present invention is achieved through the following technical solutions:
A measuring method for Shunt Capacitor Unit series reactors, comprises the steps:
Detecting Power Harmonics is carried out to Shunt Capacitor Unit, wherein, describedly Detecting Power Harmonics is carried out to Shunt Capacitor Unit comprises step: every three seconds, first harmonic monitoring is carried out to described Shunt Capacitor Unit, and monitoring more than 24 hours continuously;
According to magnitude of voltage, the current value of the raw data acquisition each harmonic that described Detecting Power Harmonics obtains, wherein, the described raw data obtained according to described Detecting Power Harmonics obtains the magnitude of voltage of each harmonic, current value comprises step: read described raw data, reject the discrete data in described raw data, carry out refinement to the raw data eliminating discrete data to analyze, obtain 95% value of each harmonic voltage, 95% value of electric current, described each harmonic comprises 2 ~ 25 subharmonic;
According to magnitude of voltage, the current value determination reactance Rate of described each harmonic, wherein, the described magnitude of voltage according to described each harmonic, current value determination reactance Rate comprise step: according to 95% value of each harmonic voltage, 95% value of individual harmonic current and the solving equation group of the mathematical analysis model determination capacitor series reactors of Shunt Capacitor Unit set up in advance, obtain the fundamental reactance of some groups of reactors, the fundamental reactance of capacitor by solving described system of equations, and determine final reactance Rate by least square method;
Wherein, described mathematical analysis model is
wherein: U
_{n95%}for 95% value of nth harmonic voltage; I
_{cn95%}for flowing through 95% value of the nth harmonic electric current of Shunt Capacitor Unit; X
_{l}for the fundamental reactance of currentlimiting reactor; X
_{c}for the fundamental reactance of capacitor; N is overtone order, n=1,2......25;
Obtain the fundamental reactance of some groups of reactors by solving described system of equations, the fundamental reactance of capacitor comprises: by 2 times and 25 subharmonic equations simultaneousnesses, 3 times and 24 subharmonic equations simultaneousnesses, ..., m time and 27m subharmonic equations simultaneousness, ..., 13 times and the acquisition of 14 subharmonic the equations simultaneousnesses fundamental reactance of 12 groups of reactors, the fundamental reactance of capacitor, m=2,3......13.
A measuring system for Shunt Capacitor Unit series reactors, comprising:
Power quality analyzer, for carrying out first harmonic monitoring every three seconds to Shunt Capacitor Unit, monitoring more than 24 hours continuously;
Data analysis module, for reading the raw data that described power quality analyzer monitors, reject the discrete data in described raw data, and refinement analysis is carried out to the raw data eliminating discrete data, obtain 95% value of each harmonic voltage, 95% value of individual harmonic current, described each harmonic comprises 2 ~ 25 subharmonic;
Reactance Rate determination module, for according to 95% value of each harmonic voltage, 95% value of individual harmonic current and the solving equation group of the mathematical analysis model determination capacitor series reactors of Shunt Capacitor Unit set up in advance, and obtain the fundamental reactance of some groups of reactors, the fundamental reactance of capacitor by described system of equations, determine final reactance Rate by least square method;
Wherein, described mathematical analysis model is
wherein: U
_{n95%}for 95% value of nth harmonic voltage; I
_{cn95%}for the electric current 95% flowing through the nth harmonic of Shunt Capacitor Unit is worth; X
_{l}for the fundamental reactance of currentlimiting reactor; X
_{c}for the fundamental reactance of capacitor; N is overtone order, n=1,2......25;
Described reactance Rate determination module obtains the fundamental reactance of some groups of reactors by solving described system of equations, the fundamental reactance of capacitor comprises: by 2 times and 25 subharmonic equations simultaneousnesses, 3 times and 24 subharmonic equations simultaneousnesses, ..., m time and 27m subharmonic equations simultaneousness, ..., 13 times and the acquisition of 14 subharmonic the equations simultaneousnesses fundamental reactance of 12 groups of reactors, the fundamental reactance of capacitor, m=2,3......13.
According to the scheme of the invention described above, by the Detecting Power Harmonics to Shunt Capacitor Unit, series reactors size when determining that capacitor is in actual motion state quickly and accurately according to the raw data obtained.By the solution of the present invention can monitor out accurately and effectively the size of series reactors when capacitor is in actual motion state whether meet designing requirement, can the amplification of effective harmonic inhabitation, ensure that the safe and reliable operation of Capacitor banks, simultaneously, data basis of the present invention is the Monitoring Data of harmonic wave, do not need special reactance Rate measuring equipment, can investment reduction cost substantially; And the present invention can carry out Detecting Power Harmonics when system cloud gray model, the not normal operation of influential system, its monitoring result meets realtime, the requirement of integrality and accuracy.
Accompanying drawing explanation
Fig. 1 is equivalent schematic diagram and the equivalent circuit diagram of frequency analysis;
Fig. 2 is the schematic flow sheet of the embodiment of the measuring method of Shunt Capacitor Unit series reactors of the present invention;
Fig. 3 is the schematic flow sheet of a preferred embodiment of the measuring method of Shunt Capacitor Unit series reactors of the present invention;
Fig. 4 is the harmonic voltage content spectrogram of certain Capacitor banks;
Fig. 5 is the harmonic current content spectrogram of certain Capacitor banks;
Fig. 6 is the structural representation of the embodiment of the measuring system of Shunt Capacitor Unit series reactors of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is further elaborated, but embodiment of the present utility model is not limited thereto.
Embodiment 1
The measuring method of Shunt Capacitor Unit series reactors of the present invention is a kind of measuring method of the Substation Parallel Capacitor group series reactors based on Detecting Power Harmonics, and the equivalent schematic diagram of its frequency analysis is shown in Fig. 1 a.In frequency analysis, by high side power zero setting, simplify through load and can obtain equivalent electrical circuit as Fig. 1 b.In figure: In is nth harmonic current source; Un is the voltage of nth harmonic on bus; X
_{sn}for the equivalent source reactance at bus place; X
_{ln}the fundamental reactance of currentlimiting reactor; X
_{cn}the fundamental reactance of capacitor.
Shown in Figure 2, be the embodiment schematic flow sheet of the measuring method of Shunt Capacitor Unit series reactors of the present invention, as shown in Figure 2, the measuring method of the Shunt Capacitor Unit series reactors in this embodiment, comprises the steps:
Step S101: Detecting Power Harmonics is carried out to Shunt Capacitor Unit, enter step S102, generally can be monitored by the harmonic wave of power quality analyzer to Shunt Capacitor Unit, power quality analyzer can be selected and put fluke F435 or day 3196 etc., is generally set observation station according to actual needs to carry out Detecting Power Harmonics;
Step S102: the magnitude of voltage, the current value that obtain each harmonic according to the raw data of described Detecting Power Harmonics, enter step S103, wherein, can by some analysis of conventional computer software realization to raw data, and then magnitude of voltage, the current value of each harmonic is obtained by raw data, the magnitude of voltage of each harmonic generally obtained, current value are relative content values;
Step S103: according to magnitude of voltage, the current value determination reactance Rate of described each harmonic, generally first calculate the fundamental reactance of currentlimiting reactor, the fundamental reactance of capacitor according to the magnitude of voltage of each harmonic, current value, reactance Rate is obtained again according to the fundamental reactance of currentlimiting reactor, the fundamental reactance of capacitor, the reactance Rate obtained is the size of capacitor series reactors when being in actual motion state, just can judge this reactance Rate whether meet designing requirement, can the amplification of effective harmonic inhabitation, ensure that the safe and reliable operation of Capacitor banks.
According to the scheme of the invention described above, by obtaining raw data to the Detecting Power Harmonics of Shunt Capacitor Unit, then series reactors size when determining that capacitor is in actual motion state quickly and accurately according to the raw data obtained.By the solution of the present invention can monitor out accurately and effectively the size of series reactors when capacitor is in actual motion state whether meet designing requirement, can the amplification of effective harmonic inhabitation, ensure that the safe and reliable operation of Capacitor banks.Because of the Monitoring Data that data basis of the present invention is harmonic wave, do not need special reactance Rate measuring equipment, can investment reduction cost substantially, the present invention program can carry out Detecting Power Harmonics when system cloud gray model simultaneously, the not normal operation of influential system, its monitoring result meets realtime, the requirement of integrality and accuracy.
In order to improve the accuracy of reactance Rate further, can consider in the following way:
Mode one: carrying out Detecting Power Harmonics to Shunt Capacitor Unit in step S101 can by carrying out first harmonic monitoring every Preset Time to Shunt Capacitor Unit, continuous monitoring more than 24 hours, wherein, Preset Time can be chosen according to actual conditions, as selected 3 seconds, carry out the degree of accuracy that 24 hours long Detecting Power Harmonicies can improve reactance Rate;
Mode two: can step be comprised according to the magnitude of voltage of the raw data acquisition each harmonic of described Detecting Power Harmonics, current value in step S102: the raw data reading described Detecting Power Harmonics, reject the discrete data in described raw data; Carry out refinement to the raw data eliminating discrete data to analyze, obtain 95% value of each harmonic voltage, 95% value of individual harmonic current, wherein 95% value, refer to a probable value, as have recorded the data of 200 times, the software being responsible for garbled data can remove the maximal value of the record of in the middle of 200 times 5% and the minimum value of record automatically;
The mode of the accuracy of abovementioned raising reactance Rate can select one, also can, in conjunction with two kinds of modes, wherein, be combined into good in two ways.
Wherein in an embodiment, abovementioned step S103 specifically can comprise step:
According to the magnitude of voltage of described each harmonic, current value and the mathematical analysis model of Shunt Capacitor Unit set up in advance or according to 95% value of each harmonic voltage, 95% value of individual harmonic current and the solving equation group of the mathematical analysis model determination capacitor series reactors of Shunt Capacitor Unit set up in advance, wherein, be not so good as to determine that the reactance Rate accuracy that the mode of solving equation group obtains is high according to 95% value of each harmonic voltage, 95% value of individual harmonic current according to the magnitude of voltage of described each harmonic, the mode of current value determination solving equation group;
Obtain the fundamental reactance of some groups of reactors, the fundamental reactance of capacitor by described system of equations, and determine final reactance Rate by least square method, least square method is the common method processing data in prior art, does not repeat them here.
Wherein in an embodiment, abovementioned each harmonic comprises 2 ~ 25 subharmonic, abovementioned mathematical analysis model is
wherein: U
_{n}for the magnitude of voltage of nth harmonic, I
_{cn}for flowing through the nth harmonic current value of Shunt Capacitor Unit, X
_{l}for the fundamental reactance of currentlimiting reactor, X
_{c}for the fundamental reactance of capacitor, n is overtone order, n=2,3......25, the fundamental reactance of some groups of reactors is obtained by described system of equations, the fundamental reactance of capacitor specifically can comprise step: by 2 times and 25 subharmonic equations simultaneousnesses, 3 times and 24 subharmonic equations simultaneousnesses, ..., m time and 27m subharmonic equations simultaneousness, ..., 13 times and 14 subharmonic equations simultaneousnesses obtain the fundamental reactance of 12 groups of reactors, the fundamental reactance of capacitor, m=2, 3......13, so just can utilize the fundamental reactance of this reactor of 12 groups, the fundamental reactance of capacitor obtains final reactance Rate in conjunction with least square method again, wherein, in order to improve the counting accuracy of reactance Rate, the harmonic voltage of many different number of times should be selected as far as possible, electric current, and quality of power supply measuring instrument general at present all more accurately can measure 2 to 25 subharmonic, and often there is the not high situation of measuring accuracy higher than the harmonic measure of 25 times, therefore general selection 2 to 25 subharmonic.
In another embodiment, and the difference of a upper embodiment is, the mathematical analysis model that a upper embodiment adopts is
the mathematical analysis model adopted in the present embodiment is
wherein: U
_{n95%}for the voltage 95% of nth harmonic is worth; I
_{cn95%}for the nth harmonic electric current 95% flowing through Shunt Capacitor Unit is worth; X
_{l}for the fundamental reactance of currentlimiting reactor, other are identical with a upper embodiment, do not repeat them here.
Embodiment 2
The schematic flow sheet of a preferred embodiment of the measuring method of Shunt Capacitor Unit series reactors of the present invention has been shown in Fig. 3.According to different Considerations, when the measuring method of specific implementation Shunt Capacitor Unit series reactors of the present invention, the whole of step shown in Fig. 5 can be comprised, also the wherein a part of step shown in Fig. 5 can only be comprised, just be described in detail for the measuring method of the Shunt Capacitor Unit series reactors of preferred embodiment shown in Fig. 5 below, but the specific embodiment of the invention is not limited thereto, the measuring method of the Shunt Capacitor Unit series reactors of this embodiment specifically comprises following several step:
Step S201: Detecting Power Harmonics is carried out to Shunt Capacitor Unit, enters step S202, detection requirement: power quality analyzer at least will can measure harmonic current value, the magnitude of voltage of 25 times; Monitor can realize every 3 seconds monitoring first harmonic voltages, harmonic current values, Detecting Power Harmonics more than time requirement 24h;
Whether step S202: the read step S201 Detecting Power Harmonics data obtained, in reading the data, in order to improve the degree of accuracy of result, being that Outlier Data judges to each Monitoring Data, and Outlier Data rejected, entering step S203;
Step S203: determine 95% value of individual harmonic current, 95% value of each harmonic voltage, enter step S204; Owing to needing data volume to be processed larger, generally can make use of the Treatment Analysis that computer software carries out Detecting Power Harmonics data, enter step S204, as shown in Figure 4, Figure 5, in certain experiment, according to 95% value spectrogram of each harmonic, 95% value spectrogram of electric current that the raw data collected obtains, the horizontal ordinate of two figure is overtone orders, ordinate is number percent;
Step S204: utilize the Detecting Power Harmonics data after step S202 and step S203 process and the capacitor frequency analysis model that presets to list the system of equations solving capacitor series reactors, enter step S205, the capacitor analyzing equivalent circuit figure according to Fig. 1 b can list following system of equations:
Wherein: U
_{n95%}for the voltage 95% of nth harmonic on bus is worth; I
_{cn95%}be worth for flowing through Capacitor banks nth harmonic electric current 95%; X
_{l}for the fundamental reactance of currentlimiting reactor; X
_{c}for the fundamental reactance of capacitor; N is all ripple number of times, n=2,3......25;
Step S205: solving equation group (1), enter step S206, in system of equations (1), one has 24 independent equations, every two equations can determine the fundamental reactance of one group of reactor, the fundamental reactance of capacitor, therefore system of equations can determine the fundamental reactance of 12 groups of mutual independently reactors, the fundamental reactance of capacitor, can 2 times and 25 subharmonic equations simultaneousnesses, 3 times and 24 subharmonic equations simultaneousnesses, ..., m time and 27m subharmonic equations simultaneousness, ..., 13 times and 14 subharmonic solving simultaneous equations, the fundamental reactance of the reactor of 12 groups can be obtained like this, the fundamental reactance of capacitor.
Step S206: utilize least square method to determine the reactance Rate value of final Capacitor banks.In order to improve the reliability of result of calculation, least square method is utilized to determine final reactance Rate value to the fundamental reactance of 12 groups of reactors solving out in step S205, the fundamental reactance of capacitor.
Embodiment 3
According to the measuring method of the Shunt Capacitor Unit series reactors of the invention described above, the present invention also provides a kind of measuring system of Shunt Capacitor Unit series reactors, and just the concrete example of the measuring system of Shunt Capacitor Unit series reactors of the present invention is described in detail below.The structural representation of the measuring system of the Shunt Capacitor Unit series reactors of the embodiment of the present invention has been shown in Fig. 6, the measuring system of the Shunt Capacitor Unit series reactors of this example comprises power quality analyzer 301, data analysis module 302, reactance Rate determination module 303, wherein:
Power quality analyzer 301, for carrying out Detecting Power Harmonics to Shunt Capacitor Unit, wherein, power quality analyzer can be selected and put fluke F435 or day 3196 etc., is generally set observation station according to actual needs to carry out Detecting Power Harmonics;
Data analysis module 302, raw data for monitoring according to power quality analyzer 301 obtains the magnitude of voltage of each harmonic, current value, and by the magnitude of voltage of each harmonic, current value is transferred to described reactance Rate determination module 303, wherein, can by some analysis of conventional computer software realization to raw data, and then the magnitude of voltage of each harmonic is obtained by raw data, current value, the magnitude of voltage of each harmonic generally obtained, current value is relative content value, as Fig. 3, shown in Fig. 4, in once testing, according to the voltage content spectrogram of each harmonic that the raw data collected obtains, the content spectrogram of electric current,
Reactance Rate determination module 303, for the magnitude of voltage according to described each harmonic, current value calculating reactance rate, generally first calculate the fundamental reactance of currentlimiting reactor, the fundamental reactance of capacitor according to the magnitude of voltage of each harmonic, current value, then obtain series reactors according to the fundamental reactance of currentlimiting reactor, the fundamental reactance of capacitor.
In order to improve the accuracy of reactance Rate, can be that power quality analyzer carries out first harmonic monitoring every Preset Time to Shunt Capacitor Unit, continuous monitoring more than 24 hours, wherein, Preset Time can be chosen according to actual conditions, as selected 3 seconds, carry out the degree of accuracy that 24 hours long Detecting Power Harmonicies can improve reactance Rate;
In order to improve the accuracy of reactance Rate, also can be the raw data that described data analysis module reads described power quality analyzer and monitors, reject the discrete data in described raw data, and refinement analysis is carried out to the raw data eliminating discrete data, obtain 95% value of each harmonic voltage, 95% value of individual harmonic current, wherein 95% value, refer to a probable value, such as, certain data acquiring and recording data of 200 times, the software being responsible for garbled data can remove the maximal value of the record of in the middle of 200 times 5% and the minimum value of record automatically.
Wherein in an embodiment, reactance Rate determination module can according to the magnitude of voltage of described each harmonic, current value and the solving equation group of the mathematical analysis model determination capacitor series reactors of Shunt Capacitor Unit set up in advance, and determine some groups of reactance Rate by described system of equations, the reactance Rate value of final Capacitor banks also can according to 95% value of each harmonic voltage to utilize least square method to determine, 95% value of individual harmonic current and the solving equation group of the mathematical analysis model determination capacitor series reactors of Shunt Capacitor Unit set up in advance, and determine some groups of reactance Rate by described system of equations, least square method is utilized to determine the reactance Rate value of final Capacitor banks, wherein, the reactance Rate value adopting the latter comparatively to adopt the former to obtain is accurate.
Wherein in an embodiment, abovementioned each harmonic comprises 2 ~ 25 subharmonic, abovementioned mathematical analysis model is
wherein: U
_{n}for the magnitude of voltage of nth harmonic, I
_{cn}for flowing through the nth harmonic current value of Shunt Capacitor Unit, X
_{l}for the fundamental reactance of currentlimiting reactor, X
_{c}for the fundamental reactance of capacitor, n is overtone order, n=2,3......25, the fundamental reactance of some groups of reactors is obtained by described system of equations, the fundamental reactance of capacitor specifically can comprise step: described reactance Rate determination module is by the fundamental reactance of reactor, the fundamental reactance of capacitor, so just can utilize the fundamental reactance of this reactor of 12 groups, the fundamental reactance of capacitor obtains final reactance Rate in conjunction with least square method again, wherein, in order to improve the counting accuracy of reactance Rate, the harmonic voltage of many different number of times should be selected as far as possible, electric current, and quality of power supply measuring instrument general at present all more accurately can measure 2 to 25 subharmonic, and often there is the not high situation of measuring accuracy higher than the harmonic measure of 25 times, therefore general selection 2 to 25 subharmonic.
In another embodiment, and the difference of a upper embodiment is, the mathematical analysis model that a upper embodiment adopts is
the mathematical analysis model adopted in the present embodiment is
wherein: U
_{n95%}for the voltage 95% of nth harmonic is worth; I
_{cn95%}for the nth harmonic electric current 95% flowing through Shunt Capacitor Unit is worth; X
_{l}for the fundamental reactance of currentlimiting reactor, other are identical with a upper embodiment, do not repeat them here.
Technical scheme of the present invention has the following advantages and beneficial effect relative to prior art tool:
1) the data basis of this programme is the Monitoring Data of harmonic wave, does not need special reactance Rate measuring equipment, can investment reduction cost substantially.
2) the technical program can carry out Detecting Power Harmonics when system cloud gray model, not the normal operation of influential system.Carry out Detecting Power Harmonics by power quality analyzer to Capacitor banks, its monitoring result meets realtime, the requirement of integrality and accuracy;
3) this programme can monitor out accurately and effectively the size of series reactors when capacitor is in actual motion state whether meet designing requirement, can the amplification of effective harmonic inhabitation, it is applied and will ensure that the safe and reliable operation of Capacitor banks, strengthens existing electric network reliability.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (2)
1. a measuring method for Shunt Capacitor Unit series reactors, is characterized in that, comprises the steps:
Detecting Power Harmonics is carried out to Shunt Capacitor Unit, wherein, describedly Detecting Power Harmonics is carried out to Shunt Capacitor Unit comprises step: every three seconds, first harmonic monitoring is carried out to described Shunt Capacitor Unit, and monitoring more than 24 hours continuously;
According to magnitude of voltage, the current value of the raw data acquisition each harmonic that described Detecting Power Harmonics obtains, wherein, the described raw data obtained according to described Detecting Power Harmonics obtains the magnitude of voltage of each harmonic, current value comprises step: read described raw data, reject the discrete data in described raw data, carry out refinement to the raw data eliminating discrete data to analyze, obtain 95% value of each harmonic voltage, 95% value of electric current, described each harmonic comprises 2 ~ 25 subharmonic;
According to magnitude of voltage, the current value determination reactance Rate of described each harmonic, wherein, the described magnitude of voltage according to described each harmonic, current value determination reactance Rate comprise step: according to 95% value of each harmonic voltage, 95% value of individual harmonic current and the solving equation group of the mathematical analysis model determination capacitor series reactors of Shunt Capacitor Unit set up in advance, obtain the fundamental reactance of some groups of reactors, the fundamental reactance of capacitor by solving described system of equations, and determine final reactance Rate by least square method;
Wherein, described mathematical analysis model is
wherein: U
_{n95%}for 95% value of nth harmonic voltage; I
_{cn95%}for flowing through 95% value of the nth harmonic electric current of Shunt Capacitor Unit; X
_{l}for the fundamental reactance of currentlimiting reactor; X
_{c}for the fundamental reactance of capacitor; N is overtone order, n=1,2......25;
Obtain the fundamental reactance of some groups of reactors by solving described system of equations, the fundamental reactance of capacitor comprises: by 2 times and 25 subharmonic equations simultaneousnesses, 3 times and 24 subharmonic equations simultaneousnesses, ..., m time and 27m subharmonic equations simultaneousness, ..., 13 times and the acquisition of 14 subharmonic the equations simultaneousnesses fundamental reactance of 12 groups of reactors, the fundamental reactance of capacitor, m=2,3......13.
2. a measuring system for Shunt Capacitor Unit series reactors, is characterized in that, comprising:
Power quality analyzer, for carrying out first harmonic monitoring every three seconds to Shunt Capacitor Unit, monitoring more than 24 hours continuously;
Data analysis module, for reading the raw data that described power quality analyzer monitors, reject the discrete data in described raw data, and refinement analysis is carried out to the raw data eliminating discrete data, obtain 95% value of each harmonic voltage, 95% value of individual harmonic current, described each harmonic comprises 2 ~ 25 subharmonic;
Reactance Rate determination module, for according to 95% value of each harmonic voltage, 95% value of individual harmonic current and the solving equation group of the mathematical analysis model determination capacitor series reactors of Shunt Capacitor Unit set up in advance, and obtain the fundamental reactance of some groups of reactors, the fundamental reactance of capacitor by described system of equations, determine final reactance Rate by least square method;
Wherein, described mathematical analysis model is
wherein: U
_{n95%}for 95% value of nth harmonic voltage; I
_{cn95%}for the electric current 95% flowing through the nth harmonic of Shunt Capacitor Unit is worth; X
_{l}for the fundamental reactance of currentlimiting reactor; X
_{c}for the fundamental reactance of capacitor; N is overtone order, n=1,2......25;
Described reactance Rate determination module obtains the fundamental reactance of some groups of reactors by solving described system of equations, the fundamental reactance of capacitor comprises: by 2 times and 25 subharmonic equations simultaneousnesses, 3 times and 24 subharmonic equations simultaneousnesses, ..., m time and 27m subharmonic equations simultaneousness, ..., 13 times and the acquisition of 14 subharmonic the equations simultaneousnesses fundamental reactance of 12 groups of reactors, the fundamental reactance of capacitor, m=2,3......13.
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CN103983865A (en) *  20140325  20140813  南京能迪电气技术有限公司  Series reactor power capacitor group operating state realtime online monitoring method 
CN106872815A (en) *  20151214  20170620  中国电力科学研究院  A kind of assembling shunt capacitor Online Fault monitoring, diagnosing method 
CN105954598B (en) *  20160311  20181130  中国石油大学(北京)  A kind of iron core reactor parameter identification method 
CN107085148B (en) *  20170320  20190830  国网江苏省电力公司无锡供电公司  A kind of online tolerance method for early warning and device of shunt capacitor group 
CN113030553B (en) *  20210526  20210824  浙江大学  Method for monitoring harmonic amplification, overload and turntoturn short circuit of 1% seriesimpedance parallel capacitor 
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