CN102798758A - 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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- CN102798758A CN102798758A CN2012103243788A CN201210324378A CN102798758A CN 102798758 A CN102798758 A CN 102798758A CN 2012103243788 A CN2012103243788 A CN 2012103243788A CN 201210324378 A CN201210324378 A CN 201210324378A CN 102798758 A CN102798758 A CN 102798758A
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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 real-time 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 the power quality analysis field, particularly a kind of measuring method and system of the Substation Parallel Capacitor group series reactance rate based on harmonic monitoring.
Background technology
Parallel condenser compensation device is because combined capacity is flexible, installation and maintenance are easy, small investment etc. is former thereby be widely used in electric system.According to statistics, national capacitive means total volume accounts for 98% of capacitive compensation capacity, becomes the main power supply of var, for the pressure regulation of electric system phase modulation, safe and stable operation, improve 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 nonlinear-loads such as simultaneous fairing, electric railway, electric arc furnaces, the widespread use of power electronic devices, and the putting into operation successively of HVDC transmission system make electrical network receive harmonic pollution severe day by day.Yet capacitive means (parallel condenser compensation device) is a capacitive load; Its access has changed the harmonic impedance characteristic of electrical network; Do not take measures or the situation of improper measures under; Higher hamonic wave is amplification,, makes in capacitive means and the electrical network that links to each other contiguous electric equipment suffer major injury even burn in case also resonance can take place during parameter matching.Practice shows, through the suitable reactor of connecting, can effectively prevent capacitor harmonic wave scale-up problem.Following regulation is made in the design alternative of standard GB 50,227 one 95 " Code for design of installation of shunt capacitors " series reactance rate: " be used to suppress harmonic wave, the background harmonics that inserts the electrical network place when parallel capacitor device is for 5 times and when above, should get 4.5%-6%; The background harmonics that inserts the electrical network place when parallel capacitor device is for 3 times and when above, should get 12%; Also can adopt 4.5%-6% and 12% two kind of reactance Rate.”
But in the long-time running of electrical network, find, owing to the reason of following two aspects make the parallel capacitor device series connection reactor effectively the limit value mains by harmonics amplification, prevent the generation of resonance:
(1) the iron core work magnetic flux density of some current-limiting reactors unshakable in one's determination is chosen too highly, makes in the reactor actual motion owing to the saturated operation reactance value that makes unshakable in one's determination is on the low side; The device of band constant reactance device moves because the needs of reactive-load compensation or partition capacitance device fault withdraw to fall to hold, and makes the actual motion reactance Rate less than normal.
(2) select for use the reactor reactance Rate inconsistent during actual type selecting with the design reactance Rate.In lectotype selection when design, recently replace reactance Rate with the rated capacity of reactor and capacitor simply; And in fact reactance Rate and the volume ratio variation that is inversely proportional to; What have chooses volume ratio with the bigger reactor of aforementioned calculating when type selecting; Also takeing for is to have increased reactance Rate, feels in fact possibly depart from former design load out and away than more " having suppressed " harmonic wave in the past.Must select actual product for use according to the induction reactance value of the definite reactor of the percentage value of capacitive reactance when selecting reactor for use.
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 reactance rate; Series reactance rate size when it can confirm quickly and accurately that capacitor is in the actual motion state; With the safe and reliable operation of assurance capacitor group, small investment, easy to operate.
The object of the invention is realized through following technical scheme:
A kind of measuring method of Shunt Capacitor Unit series reactance rate comprises the steps:
Shunt Capacitor Unit is carried out harmonic monitoring;
Obtain magnitude of voltage, the current value of each harmonic according to the raw data of said harmonic monitoring acquisition;
Magnitude of voltage, current value according to said each harmonic are confirmed reactance Rate.
A kind of measuring system of Shunt Capacitor Unit series reactance rate comprises:
Power quality analyzer is used for Shunt Capacitor Unit is carried out harmonic monitoring;
Data analysis module is used for obtaining according to the raw data of power quality analyzer monitoring magnitude of voltage, the current value of each harmonic, and magnitude of voltage, the current value of each harmonic is transferred to said reactance Rate determination module;
The reactance Rate determination module, the magnitude of voltage, the current value that are used for according to said each harmonic are confirmed reactance Rate.
According to the scheme of the invention described above, through harmonic monitoring to Shunt Capacitor Unit, series reactance rate size when confirming that capacitor is in the actual motion state quickly and accurately according to the raw data of obtaining.Can whether the size that can monitor out capacitor series reactance rate when being in the actual motion state accurately and effectively through scheme of the present invention adhere to specification, effectively suppress the amplification of harmonic wave; Guaranteed the safe and reliable operation of capacitor group; Simultaneously; Data of the present invention basis is the Monitoring Data of harmonic wave, does not need special reactance Rate measuring equipment, can practice thrift cost of investment substantially; And the present invention carries out harmonic monitoring in the time of can moving in system, does not influence the normal operation of system, and its monitoring result satisfies real-time, the requirement of integrality and accuracy.
Description of drawings
Fig. 1 is the equivalent schematic diagram and the equivalent circuit diagram of frequency analysis;
Fig. 2 is the schematic flow sheet of embodiment of the measuring method of Shunt Capacitor Unit series reactance rate of the present invention;
Fig. 3 is the schematic flow sheet of a preferred embodiment of the measuring method of Shunt Capacitor Unit series reactance rate of the present invention;
Fig. 4 is the harmonic voltage content spectrogram of certain capacitor group;
Fig. 5 is the harmonic current content spectrogram of certain capacitor group;
Fig. 6 is the structural representation of embodiment of the measuring system of Shunt Capacitor Unit series reactance rate of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is further set forth, but embodiment of the present invention are not limited thereto.
Embodiment 1
The measuring method of Shunt Capacitor Unit series reactance rate of the present invention is a kind of measuring method of the Substation Parallel Capacitor group series reactance rate based on harmonic monitoring, and the equivalent schematic diagram of its frequency analysis is seen Fig. 1 a.In frequency analysis,, can get equivalent electrical circuit such as Fig. 1 b through the load simplification with high-pressure side power supply zero setting.Among the figure: In is the nth harmonic current source; Un is the voltage of nth harmonic on bus; X
SnEquivalent source reactance for the bus place; X
LnThe fundamental reactance of current-limiting reactor; X
CnThe fundamental reactance of capacitor.
Referring to shown in Figure 2, be the embodiment schematic flow sheet of the measuring method of Shunt Capacitor Unit series reactance rate of the present invention, as shown in Figure 2, the measuring method of the Shunt Capacitor Unit series reactance rate among this embodiment comprises the steps:
Step S101: Shunt Capacitor Unit is carried out harmonic monitoring; Get into step S102; Generally can monitor the harmonic wave of Shunt Capacitor Unit through power quality analyzer; Power quality analyzer can select for use fluke F435 or day to put 3196 etc., generally is to set observation station according to actual needs to carry out harmonic monitoring;
Step S102: the magnitude of voltage, the current value that obtain each harmonic according to the raw data of said harmonic monitoring; Get into step S103; Wherein, Can realize the analysis to raw data through some computer softwares commonly used, and then obtain magnitude of voltage, the current value of each harmonic through raw data, the magnitude of voltage of the each harmonic that generally obtains, current value are the relative content values;
Step S103: magnitude of voltage, current value according to said each harmonic are confirmed reactance Rate; Generally be earlier according to the magnitude of voltage of each harmonic, the fundamental reactance that current value calculates current-limiting reactor, the fundamental reactance of capacitor; Obtain reactance Rate according to the fundamental reactance of current-limiting reactor, the fundamental reactance of capacitor again; The reactance Rate that obtains is the size of capacitor series reactance rate when being in the actual motion state; Just can judge whether this reactance Rate adheres to specification, can effectively suppress the amplification of harmonic wave, guarantee the safe and reliable operation of capacitor group.
According to the scheme of the invention described above, obtain raw data through harmonic monitoring, series reactance rate size when confirming that capacitor is in the actual motion state quickly and accurately according to the raw data of obtaining again to Shunt Capacitor Unit.Can whether the size that can monitor out capacitor series reactance rate when being in the actual motion state accurately and effectively through scheme of the present invention adhere to specification, effectively suppress the amplification of harmonic wave, guaranteed the safe and reliable operation of capacitor group.Because of data of the present invention basis is the Monitoring Data of harmonic wave; Do not need special reactance Rate measuring equipment; Can practice thrift cost of investment substantially, carry out harmonic monitoring when the present invention program can move in system simultaneously, not influence the normal operation of system; Its monitoring result satisfies real-time, the requirement of integrality and accuracy.
In order further to improve the accuracy of reactance Rate, can consider to adopt following mode:
Mode one: in step S101, Shunt Capacitor Unit is carried out harmonic monitoring and can carry out the first harmonic monitoring at a distance from Preset Time to Shunt Capacitor Unit through every; Continuous monitoring is more than 24 hours; Wherein, Preset Time can be chosen according to actual conditions, as selects 3 seconds, carries out the degree of accuracy that 24 hours long harmonic monitoring can improve reactance Rate;
Mode two: the magnitude of voltage, the current value that obtain each harmonic according to the raw data of said harmonic monitoring among the step S102 can comprise step: read the raw data of said harmonic monitoring, reject the discrete data in the said raw data; Raw data to having rejected discrete data is refined analysis; Obtain 95% value of each harmonic voltage, 95% value of each harmonic electric current; Wherein 95% is worth; Be meant a probable value, as write down 200 times data that the software of being responsible for garbled data can remove in the middle of 200 times the maximal value of 5% record and the minimum value of record automatically;
The mode of the accuracy of above-mentioned raising reactance Rate can be selected one of which, also can combine dual mode, wherein, is combined into good in two ways.
Among embodiment, above-mentioned step S103 can specifically comprise step therein:
Based on the mathematical analysis model of the magnitude of voltage of said each harmonic, current value and the Shunt Capacitor Unit set up in advance or based on 95% value of 95% value of each harmonic voltage, each harmonic electric current and in advance the mathematical analysis model of the Shunt Capacitor Unit of foundation confirm the solving equation group of capacitor series reactance rate; Wherein, confirm that based on magnitude of voltage, the current value of said each harmonic the mode of solving equation group is not so good as 95% value based on each harmonic voltage, 95% value of each harmonic electric current is confirmed the reactance Rate degree of accuracy height that the mode of solving equation group obtains;
Obtain the fundamental reactance of some groups of reactors, the fundamental reactance of capacitor through said system of equations, and confirm final reactance Rate through least square method, least square method is the common method of deal with data in the prior art, does not repeat them here.
Among embodiment, above-mentioned each harmonic comprises 2～25 subharmonic therein; Above-mentioned mathematical analysis model does
Wherein: U
nMagnitude of voltage for nth harmonic; I
CnFor flowing through the nth harmonic current value of Shunt Capacitor Unit; X
LFundamental reactance for current-limiting reactor; X
CFundamental reactance for capacitor; N is an overtone order, n=2,3 ... 25; Through said system of equations obtain the fundamental reactance of some groups of reactors, the fundamental reactance of capacitor specifically can comprise step: through 2 times and 25 subharmonic equations simultaneousnesses; 3 times and 24 subharmonic equations simultaneousnesses ..., m time and 27-m 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 to combine least square method to obtain final reactance Rate again; Wherein, In order to improve the counting accuracy of reactance Rate, should select harmonic voltage, the electric current of many different number of times as far as possible for use, and general quality of power supply measuring instrument all can more accurately be measured 2 to 25 subharmonic at present; And often there is the not high situation of measuring accuracy in the harmonic measure that is higher than 25 times, so general 2 to 25 subharmonic of selecting.
In another embodiment, be that the mathematical analysis model that a last embodiment adopts does with the different of a last embodiment
The mathematical analysis model that adopts in the present embodiment does
Wherein: U
N95%Voltage 95% value for nth harmonic; I
Cn95%For flowing through nth harmonic electric current 95% value of Shunt Capacitor Unit; X
LBe the fundamental reactance of current-limiting reactor, other are identical with a last embodiment, do not repeat them here.
The schematic flow sheet of a preferred embodiment of the measuring method of Shunt Capacitor Unit series reactance rate of the present invention has been shown among Fig. 3.According to different Considerations; When the measuring method of concrete realization Shunt Capacitor Unit series reactance rate of the present invention; Can comprise the whole of step shown in Fig. 5; Also can only comprise the wherein a part of step shown in Fig. 5; Below just be elaborated to the measuring method of the Shunt Capacitor Unit series reactance rate of preferred embodiment shown in Figure 5, but the specific embodiment of the invention is not limited thereto, the measuring method of the Shunt Capacitor Unit series reactance rate of this embodiment specifically comprises following several steps:
Step S201: Shunt Capacitor Unit is carried out harmonic monitoring, get into step S202, monitoring requires: power quality analyzer energy measurement at least goes out 25 times harmonic current value, magnitude of voltage; Monitor can be realized monitoring first harmonic voltage, harmonic current value in per 3 seconds, more than the harmonic monitoring time requirement 24h;
Whether the harmonic monitoring data that step S202: read step S201 obtains in the reading of data process, in order to improve result's degree of accuracy, are that the data that peel off are judged to each Monitoring Data, and reject the data that peel off, and get into step S203;
Step S203: confirm 95% value of each harmonic electric current, 95% value of each harmonic voltage, get into step S204; Owing to need the data volume of processing bigger; Generally can utilize computer software to carry out the Treatment Analysis of harmonic monitoring data; Getting into step S204, like Fig. 4, shown in Figure 5, is in certain experiment; 95% value spectrogram of the each harmonic that obtains according to the raw data that collects, 95% value spectrogram of electric current, two horizontal ordinates of scheming are that overtone order, ordinate are number percent;
Step S204: utilize harmonic monitoring data and predefined capacitor frequency analysis model after step S202 and step S203 processing to list the system of equations of finding the solution the capacitors in series reactance Rate; Get into step S205, analyze equivalent circuit diagram according to the capacitor of Fig. 1 b and can list following system of equations:
Wherein: U
N95%Be voltage 95% value of nth harmonic on bus; I
Cn95%For flowing through capacitor group nth harmonic electric current 95% value; X
LFundamental reactance for current-limiting reactor; X
CFundamental reactance for capacitor; N is an overtone order, n=2,3 ... 25;
Step S205: solving equation group (1); Get into step S206; One has 24 independent equations in the equation group (1); Per two equations can be confirmed the fundamental reactance of one group of reactor; The fundamental reactance of capacitor; So equation group can be confirmed 12 groups of mutual independently fundamental reactances of reactor; The fundamental reactance of capacitor; Can 2 times and 25 subharmonic equations simultaneousnesses; 3 times and 24 subharmonic equations simultaneousnesses; M time and 27-m subharmonic equations simultaneousness;, 13 times and 14 subharmonic solving simultaneous equations can obtain the fundamental reactance of 12 groups reactor like this; The fundamental reactance of capacitor.
Step S206: utilize least square method to confirm the reactance Rate value of final capacitor group.In order to improve the reliability of result of calculation, utilize least square method to confirm final reactance Rate value to the fundamental reactance of 12 groups of reactors of finding the solution out among the step S205, the fundamental reactance of capacitor.
Embodiment 3
Measuring method according to the Shunt Capacitor Unit series reactance rate of the invention described above; The present invention also provides a kind of measuring system of Shunt Capacitor Unit series reactance rate, below is elaborated with regard to the concrete example of the measuring system of Shunt Capacitor Unit series reactance rate of the present invention.The structural representation of measuring system of the Shunt Capacitor Unit series reactance rate of the embodiment of the invention has been shown among Fig. 6; The measuring system of the Shunt Capacitor Unit series reactance rate of this instance comprises power quality analyzer 301, data analysis module 302, reactance Rate determination module 303, wherein:
Reactance Rate determination module 303; The magnitude of voltage, the current value that are used for according to said each harmonic calculate reactance Rate; Generally be earlier according to the magnitude of voltage of each harmonic, the fundamental reactance that current value calculates current-limiting reactor, the fundamental reactance of capacitor, again according to the fundamental reactance of current-limiting reactor, the fundamental reactance acquisition series reactance rate of capacitor.
In order to improve the degree of accuracy of reactance Rate; Can be that power quality analyzer whenever carries out the first harmonic monitoring at a distance from Preset Time to Shunt Capacitor Unit; Continuous monitoring is more than 24 hours; Wherein, Preset Time can be chosen according to actual conditions; As select 3 seconds, carry out the accuracy that 24 hours long harmonic monitoring can improve reactance Rate;
In order to improve the accuracy of reactance Rate; Also can be that said data analysis module reads the raw data that said power quality analyzer monitors, reject the discrete data in the said raw data, and the raw data of having rejected discrete data is refined analysis; Obtain 95% value of each harmonic voltage, 95% value of each harmonic electric current; Wherein 95% value is meant a probable value, for example; Certain data acquiring and recording 200 times data, the software of being responsible for garbled data can remove in the middle of 200 times the maximal value of 5% record and the minimum value of record automatically.
Therein among embodiment; The reactance Rate determination module can be confirmed the solving equation group of capacitors in series reactance Rate according to the mathematical analysis model of the magnitude of voltage of said each harmonic, current value and the Shunt Capacitor Unit of setting up in advance; And confirm some groups of reactance Rate through said system of equations; Utilize reactance Rate value that least square method confirms final capacitor group also can confirm the solving equation group of capacitors in series reactance Rate according to the mathematical analysis model of 95% value of 95% value of each harmonic voltage, each harmonic electric current and the Shunt Capacitor Unit of setting up in advance; And confirm some groups of reactance Rate through said system of equations; Utilize least square method to confirm the reactance Rate value of final capacitor group, wherein, the reactance Rate value that adopts the latter to adopt the former to obtain is accurate.
Among embodiment, above-mentioned each harmonic comprises 2～25 subharmonic therein; Above-mentioned mathematical analysis model does
Wherein: U
nMagnitude of voltage for nth harmonic; I
CnFor flowing through the nth harmonic current value of Shunt Capacitor Unit; X
LFundamental reactance for current-limiting reactor; X
CFundamental reactance for capacitor; N is an overtone order, n=2,3 ... 25; Through said system of equations obtain the fundamental reactance of some groups of reactors, the fundamental reactance of capacitor specifically can comprise step: said reactance Rate determination module is through 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 to combine least square method to obtain final reactance Rate again; Wherein, In order to improve the counting accuracy of reactance Rate; Should select harmonic voltage, the electric current of many different number of times as far as possible for use; And at present general quality of power supply measuring instrument all can more accurately be measured 2 to 25 subharmonic, often has the not high situation of measuring accuracy and be higher than 25 times harmonic measure, so general selection 2 to 25 subharmonic.
In another embodiment, be that the mathematical analysis model that a last embodiment adopts does with the different of a last embodiment
The mathematical analysis model that adopts in the present embodiment does
Wherein: U
N95%Voltage 95% value for nth harmonic; I
Cn95%For flowing through nth harmonic electric current 95% value of Shunt Capacitor Unit; X
LBe the fundamental reactance of current-limiting reactor, other are identical with a last embodiment, do not repeat them here.
Technical scheme of the present invention has following advantage and beneficial effect with respect to prior art:
1) the data basis of this programme is the Monitoring Data of harmonic wave, does not need special reactance Rate measuring equipment, can practice thrift cost of investment substantially.
Carry out harmonic monitoring when 2) the present technique scheme can be moved in system, do not influence the normal operation of system.Through power quality analyzer the capacitor group is carried out harmonic monitoring, its monitoring result satisfies real-time, the requirement of integrality and accuracy;
3) can whether this programme size that can monitor out capacitor series reactance rate when being in the actual motion state accurately and effectively adhere to specification, effectively suppress the amplification of harmonic wave; It is applied the safe and reliable operation that has guaranteed the capacitor group, has strengthened existing electric network reliability.
The above embodiment has only expressed several kinds of embodiments of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the present invention's design, 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 accompanying claims.
Claims (10)
1. the measuring method of a Shunt Capacitor Unit series reactance rate is characterized in that, comprises the steps:
Shunt Capacitor Unit is carried out harmonic monitoring;
Obtain magnitude of voltage, the current value of each harmonic according to the raw data of said harmonic monitoring acquisition;
Magnitude of voltage, current value according to said each harmonic are confirmed reactance Rate.
2. the measuring method of Shunt Capacitor Unit series reactance rate according to claim 1 is characterized in that:
Saidly Shunt Capacitor Unit is carried out harmonic monitoring comprise step: whenever Shunt Capacitor Unit is carried out the first harmonic monitoring, and continuous monitoring is more than 24 hours at a distance from Preset Time;
Perhaps/with
Magnitude of voltage, current value that the said raw data that obtains according to said harmonic monitoring is obtained each harmonic comprise the steps:
Read said raw data, reject the discrete data in the said raw data;
Raw data to having rejected discrete data is refined analysis, obtains 95% value of each harmonic voltage, 95% value of electric current.
3. the measuring method of Shunt Capacitor Unit series reactance rate according to claim 1 and 2 is characterized in that, said magnitude of voltage according to said each harmonic, current value confirm that reactance Rate comprises the steps:
Confirm the solving equation group of capacitor series reactance rate based on the mathematical analysis model of the magnitude of voltage of said each harmonic, current value and the Shunt Capacitor Unit set up in advance; Perhaps, confirm the solving equation group of capacitor series reactance rate based on the mathematical analysis model of 95% value of 95% value of each harmonic voltage, each harmonic electric current and the Shunt Capacitor Unit set up in advance;
Obtain the fundamental reactance of some groups of reactors, the fundamental reactance of capacitor through finding the solution said system of equations, and confirm final reactance Rate through least square method.
4. the measuring method of Shunt Capacitor Unit series reactance rate according to claim 3 is characterized in that:
Said each harmonic comprises 2～25 subharmonic;
Said mathematical analysis model does
Wherein: U
nMagnitude of voltage for nth harmonic; I
CnFor flowing through the nth harmonic current value of Shunt Capacitor Unit; X
LFundamental reactance for current-limiting reactor; X
CFundamental reactance for capacitor; N is an overtone order, n=2,3 ... 25;
Through find the solution the fundamental reactance that said system of equations obtains some groups of reactors, the fundamental reactance of capacitor comprises: through 2 times and 25 subharmonic equations simultaneousnesses; 3 times and 24 subharmonic equations simultaneousnesses;, m time and 27-m 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.
5. the measuring method of Shunt Capacitor Unit series reactance rate according to claim 3 is characterized in that:
Said each harmonic comprises 2～25 subharmonic;
Said mathematical analysis model does
Wherein: U
N95%95% value for nth harmonic voltage; I
Cn95%95% value for the nth harmonic electric current that flows through Shunt Capacitor Unit; X
LFundamental reactance for current-limiting reactor; X
CFundamental reactance for capacitor; N is an overtone order, n=1,2 ... 25;
Through find the solution the fundamental reactance that said system of equations obtains some groups of reactors, the fundamental reactance of capacitor comprises: through 2 times and 25 subharmonic equations simultaneousnesses; 3 times and 24 subharmonic equations simultaneousnesses;, m time and 27-m 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.
6. the measuring system of a Shunt Capacitor Unit series reactance rate is characterized in that, comprising:
Power quality analyzer is used for Shunt Capacitor Unit is carried out harmonic monitoring;
Data analysis module is used for obtaining according to the raw data of power quality analyzer monitoring magnitude of voltage, the current value of each harmonic, and magnitude of voltage, the current value of each harmonic is transferred to said reactance Rate determination module;
The reactance Rate determination module, the magnitude of voltage, the current value that are used for according to said each harmonic are confirmed reactance Rate.
7. the measuring system of Shunt Capacitor Unit series reactance rate according to claim 6 is characterized in that:
Said power quality analyzer is every to carry out the first harmonic monitoring at a distance from Preset Time to Shunt Capacitor Unit, and continuous monitoring is more than 24 hours;
Perhaps/with
Said data analysis module reads the raw data that said power quality analyzer monitors; Reject the discrete data in the said raw data; And the raw data of having rejected discrete data refined analysis, obtain 95% value of each harmonic voltage, 95% value of each harmonic electric current.
8. according to the measuring system of claim 6 or 7 described Shunt Capacitor Unit series reactance rates, it is characterized in that:
Said reactance Rate determination module is confirmed the solving equation group of capacitors in series reactance Rate according to the mathematical analysis model of the magnitude of voltage of said each harmonic, current value and the Shunt Capacitor Unit set up in advance; Perhaps; Confirm the solving equation group of capacitors in series reactance Rate according to the mathematical analysis model of 95% value of 95% value of each harmonic voltage, each harmonic electric current and the Shunt Capacitor Unit set up in advance; And obtain the fundamental reactance of some groups of reactors, the fundamental reactance of capacitor through said system of equations, confirm final reactance Rate through least square method.
9. the measuring system of Shunt Capacitor Unit series reactance rate according to claim 8 is characterized in that:
Said each harmonic comprises 2～25 subharmonic;
Said mathematical analysis model does
Wherein: U
nMagnitude of voltage for nth harmonic; I
CnFor flowing through the nth harmonic current value of Shunt Capacitor Unit; X
LFundamental reactance for current-limiting reactor; X
CFundamental reactance for capacitor; N is an overtone order, n=1,2 ... 25;
Said reactance Rate determination module comprises through the fundamental reactance that obtains some groups of reactors of finding the solution said system of equations, the fundamental reactance of capacitor: through 2 times and 25 subharmonic equations simultaneousnesses; 3 times and 24 subharmonic equations simultaneousnesses;, m time and 27-m 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.
10. the measuring system of Shunt Capacitor Unit series reactance rate according to claim 8 is characterized in that:
Said each harmonic comprises 2～25 subharmonic;
Said mathematical analysis model does
Wherein: U
N95%95% value for nth harmonic voltage; I
Cn95%Electric current 95% value for the nth harmonic that flows through Shunt Capacitor Unit; X
LFundamental reactance for current-limiting reactor; X
CFundamental reactance for capacitor; N is an overtone order, n=1,2 ... 25;
Said reactance Rate determination module comprises through the fundamental reactance that obtains some groups of reactors of finding the solution said system of equations, the fundamental reactance of capacitor: through 2 times and 25 subharmonic equations simultaneousnesses; 3 times and 24 subharmonic equations simultaneousnesses;, m time and 27-m 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.
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| CN106872815A (en) * | 2015-12-14 | 2017-06-20 | 中国电力科学研究院 | A kind of assembling shunt capacitor On-line Fault monitoring, diagnosing method |
| CN107085148A (en) * | 2017-03-20 | 2017-08-22 | 国网江苏省电力公司无锡供电公司 | The online tolerance limit method for early warning and device of a kind of shunt capacitor group |
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| CN103983865A (en) * | 2014-03-25 | 2014-08-13 | 南京能迪电气技术有限公司 | Series reactor power capacitor group operating state real-time online monitoring method |
| CN106872815A (en) * | 2015-12-14 | 2017-06-20 | 中国电力科学研究院 | A kind of assembling shunt capacitor On-line Fault monitoring, diagnosing method |
| CN105954598A (en) * | 2016-03-11 | 2016-09-21 | 中国石油大学(北京) | Iron core reactor parameter identification method |
| CN105954598B (en) * | 2016-03-11 | 2018-11-30 | 中国石油大学(北京) | A kind of iron core reactor parameter identification method |
| CN107085148A (en) * | 2017-03-20 | 2017-08-22 | 国网江苏省电力公司无锡供电公司 | The online tolerance limit method for early warning and device of a kind of shunt capacitor group |
| CN113030553A (en) * | 2021-05-26 | 2021-06-25 | 浙江大学 | Method for monitoring harmonic amplification, overload and turn-to-turn short circuit of 1% series-impedance parallel capacitor |
| CN113030553B (en) * | 2021-05-26 | 2021-08-24 | 浙江大学 | Method for monitoring harmonic amplification, overload and turn-to-turn short circuit of 1% series-impedance parallel capacitor |
| CN115498645A (en) * | 2022-10-13 | 2022-12-20 | 费莱(浙江)科技有限公司 | Method and system for reducing dangerous resonance between system impedances |
| CN115498645B (en) * | 2022-10-13 | 2023-08-08 | 费莱(浙江)科技有限公司 | Method and system for reducing dangerous resonance between system impedances |
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