CN103235197B - The method and system of reactive power compensator degree of unbalancedness test - Google Patents
The method and system of reactive power compensator degree of unbalancedness test Download PDFInfo
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Abstract
The invention provides the method and system of a kind of reactive power compensator degree of unbalancedness test, by measured parameter value is carried out conformity calculation with the nominal parameter value obtained in advance, obtain the degree of unbalancedness of reactive power compensator, it is achieved that the assessment to reactive power compensator entirety imbalance situation.Therefore, the present invention is no longer dispersion is independent between each measurement data, efficiently solves because the dispersion between each measurement data is independent, it is impossible to the situation that reactive power compensator entirety imbalance situation is estimated.
Description
Technical field
The present invention relates to technical field of measurement and test, more particularly, it relates to the method and system of a kind of reactive power compensator degree of unbalancedness test.
Background technology
Along with the development of China's power industry, high-voltage transmission network gradually forms on a large scale, for ensureing electric power quality, reduce grid loss, it is ensured that electric power netting safe running, it is necessary to electrical network is carried out reactive-load compensation, therefore, reactive power compensator becomes the electrical network indispensable part of composition.When in reactive power compensator when inductively or capacitively breaking down, other electric capacity or inductance will be impacted.For Shunt Capacitor Unit, each phase in Shunt Capacitor Unit three-phase (A phase, B phase and C phase), form by current-limiting reactor and capacitor, when there being capacitor failure, the imbalance of Capacitor banks internal capacitance amount will be caused, partial capacitor voltage is raised, once voltage exceedes permissible value, will cause that capacitor internal punctures.For preventing capacitor internal from puncturing, Shunt Capacitor Unit adopt unbalance protection mode, when there being electric capacity to break down, unbalance protection will action, to excise faulty capacitor, reach protection electric capacity, isolated fault point purpose.Shunt Capacitor Unit takes different unbalance protection modes according to different electric pressures and capacity, and unbalance protection mode, between each capacitor of every phase Capacitor banks, each series block, between each arm, the alternate requirement having balanced arrangement.Therefore, for assessing the trim situation of Shunt Capacitor Unit in time, it is necessary to the degree of unbalancedness of Shunt Capacitor Unit is tested.
Current widely used capacitor and inductor test instrunment, electric capacity in reactive power compensator, inductance parameters are carried out single-measurement, then according to single capacitor capacitance and rated capacitance deviation, separate unit reactor inductance and inductance ratings value deviation, the degree of unbalancedness of reactive power compensator is estimated.
But, capacitor and inductor test instrunment can only, to inductance, the measurement of electric capacity single parameter, be that dispersion is independent between each measurement data, it is impossible to reactive power compensator entirety imbalance situation is estimated.
Summary of the invention
In view of this, the present invention provides a kind of reactive power compensator degree of unbalancedness method of testing and system, so that reactive power compensator entirety imbalance situation to be estimated.
A kind of method of reactive power compensator degree of unbalancedness test, including:
Obtain the nominal parameter value of the electrical equipment of reactive power compensator, wherein: described electrical equipment includes capacitor and/or reactor；Described nominal parameter value includes: rated voltage, rated current, rated capacity, rated capacitance and inductance ratings value；
Measure the voltage and current of described electrical equipment, obtain the measured parameter value of described electrical equipment；
According to described measured parameter value and described nominal parameter value, obtain the degree of unbalancedness of described reactive power compensator.
Preferably, when described reactive power compensator is Shunt Capacitor Unit, described Shunt Capacitor Unit includes capacitor and reactor, and described method includes:
Obtain rated voltage, rated current and the rated capacity of whole group of described Shunt Capacitor Unit；Obtain the rated voltage of each single capacitor in described Shunt Capacitor Unit, rated current, rated capacity and rated capacitance；Obtain the rated voltage of each separate unit reactor in described Shunt Capacitor Unit, rated current, rated capacity and inductance ratings value；According to the rated capacitance of described each single capacitor, obtain the rated capacitance of each string section in described Shunt Capacitor Unit and the rated capacitance of each phase；
Measure the voltage and current of described each single capacitor, obtain the actual measurement capacitance of described each single capacitor；Measure the voltage and current of described each separate unit reactor, obtain the actual measurement inductance value of described each separate unit reactor；According to the actual measurement capacitance of described each single capacitor, obtain the actual measurement capacitance between each string actual measurement capacitance of section in described Shunt Capacitor Unit, the actual measurement capacitance of each phase and any two line terminals；
According to described actual measurement capacitance and corresponding rated capacitance, and, described actual measurement inductance value and inductance ratings value, obtain the degree of unbalancedness of described Shunt Capacitor Unit.
Preferably, described according to described actual measurement capacitance and corresponding rated capacitance, described actual measurement inductance value and inductance ratings value, obtain the degree of unbalancedness of described Shunt Capacitor Unit, specifically include:
According to actual measurement capacitance and the rated capacitance of described each single capacitor of described each single capacitor, obtain the deviation of described actual measurement capacitance and described rated capacitance；
According to actual measurement inductance value and the inductance ratings value of described each separate unit reactor of described each separate unit reactor, obtain the deviation of described actual measurement inductance value and described inductance ratings value；
According to actual measurement inductance value and the meansigma methods of three-phase actual measurement inductance value of described each separate unit reactor, obtain the deviation of described actual measurement inductance value and the meansigma methods of described three-phase actual measurement inductance value；
According to actual measurement capacitance and the rated capacitance of described each string section of described each string section, obtain the deviation of described actual measurement capacitance and described rated capacitance；
According to actual measurement capacitance and the rated capacitance of described each phase of described each phase, obtain the deviation of described actual measurement capacitance and described rated capacitance.
Preferably, also include:
According to the actual measurement capacitance between any two line terminals, obtain the ratio of the minima of actual measurement capacitance between the maximum of actual measurement capacitance between two line terminals and two line terminals.
Preferably, described according to described actual measurement capacitance and corresponding rated capacitance, described actual measurement inductance value and inductance ratings value, obtain the degree of unbalancedness of described Shunt Capacitor Unit, specifically include:
According to the rated voltage of whole group of described Shunt Capacitor Unit, the actual measurement capacitance of described each phase, described each separate unit reactor actual measurement inductance value, obtain the neutral point voltage drift value of described Shunt Capacitor Unit；
According to the unbalance protection mode of described neutral point voltage drift value, described Shunt Capacitor Unit, and the no-load voltage ratio of the transformer being connected with described Shunt Capacitor Unit, obtain magnitude of voltage or the current value of described Shunt Capacitor Unit unbalance protection signal.
Preferably, when described reactive power compensator is shunt reactor group, described shunt reactor group includes reactor, and described method includes:
Obtain the rated voltage of described shunt reactor group, rated current, rated capacity and inductance ratings value；
Measure the voltage and current of each phase in described shunt reactor group, obtain the actual measurement inductance value of each phase in described shunt reactor group；According to the actual measurement inductance value of described each phase, obtain the actual measurement inductance value between any two line terminals；
According to actual measurement inductance value and the described inductance ratings value of described each phase, obtain described actual measurement inductance value and the deviation of described inductance ratings value；According to the meansigma methods of the actual measurement inductance value of described each phase and three-phase actual measurement inductance value, obtain the deviation of described actual measurement inductance value and the meansigma methods of described three-phase actual measurement inductance value.
Preferably, also include:
According to the actual measurement inductance value between any two line terminals, obtain the ratio of the minima of actual measurement inductance value between the maximum of actual measurement inductance value between two line terminals and two line terminals.
A kind of system of reactive power compensator degree of unbalancedness test, including:
Acquiring unit, for obtaining the nominal parameter value of the electrical equipment of reactive power compensator, wherein: described electrical equipment includes capacitor and/or reactor；Described nominal parameter value includes: rated voltage, rated current, rated capacity, rated capacitance and inductance ratings value；
Measuring unit, for measuring the voltage and current of described electrical equipment, obtains the measured parameter value of described electrical equipment；
Analytic unit, for according to described measured parameter value and described nominal parameter value, obtaining the degree of unbalancedness of described reactive power compensator.
Preferably, when described reactive power compensator is Shunt Capacitor Unit, described Shunt Capacitor Unit includes capacitor and reactor, and described system includes:
First obtains subelement, for obtaining rated voltage, rated current and the rated capacity of whole group of described Shunt Capacitor Unit；Obtain the rated voltage of each single capacitor in described Shunt Capacitor Unit, rated current, rated capacity and rated capacitance；Obtain the rated voltage of each separate unit reactor in described Shunt Capacitor Unit, rated current, rated capacity and inductance ratings value；According to the rated capacitance of described each single capacitor, obtain the rated capacitance of each string section in described Shunt Capacitor Unit and the rated capacitance of each phase；
First measures subelement, for measuring the voltage and current of described each single capacitor, obtains the actual measurement capacitance of described each single capacitor；Measure the voltage and current of described each separate unit reactor, obtain the actual measurement inductance value of described each separate unit reactor；According to the actual measurement capacitance of described each single capacitor, obtain the actual measurement capacitance between each string actual measurement capacitance of section in described Shunt Capacitor Unit, the actual measurement capacitance of each phase and any two line terminals；
First analyzes subelement, for according to described actual measurement capacitance and corresponding rated capacitance, and, described actual measurement inductance value and inductance ratings value, obtain the degree of unbalancedness of described Shunt Capacitor Unit.
Preferably, when described reactive power compensator is shunt reactor group, described shunt reactor group includes reactor, and described system includes:
Second obtains subelement, obtains the rated voltage of described shunt reactor group, rated current, rated capacity and inductance ratings value；
Second measures subelement, measures the voltage and current of each phase in described shunt reactor group, obtains the actual measurement inductance value of each phase in described shunt reactor group；According to the actual measurement inductance value of described each phase, obtain the actual measurement inductance value between any two line terminals；
Second analyzes subelement, according to actual measurement inductance value and the described inductance ratings value of described each phase, obtains described actual measurement inductance value and the deviation of described inductance ratings value；According to the meansigma methods of the actual measurement inductance value of described each phase and three-phase actual measurement inductance value, obtain the deviation of described actual measurement inductance value and the meansigma methods of described three-phase actual measurement inductance value.
Can be seen that from above-mentioned technical scheme, the invention provides the method and system of a kind of reactive power compensator degree of unbalancedness test, by measured parameter value is carried out conformity calculation with the nominal parameter value obtained in advance, obtain the degree of unbalancedness of reactive power compensator, it is achieved that the assessment to reactive power compensator entirety imbalance situation.Therefore, the present invention is no longer dispersion is independent between each measurement data, efficiently solves because the dispersion between each measurement data is independent, it is impossible to the situation that reactive power compensator entirety imbalance situation is estimated.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
The method of a kind of reactive power compensator degree of unbalancedness test that Fig. 1 provides for the embodiment of the present invention；
The elementary diagram of a kind of Shunt Capacitor Unit that Fig. 2 provides for the embodiment of the present invention；
The elementary diagram of a kind of shunt reactor group that Fig. 3 provides for the embodiment of the present invention；
The structural representation of the system of a kind of reactive power compensator degree of unbalancedness test that Fig. 4 provides for the embodiment of the present invention；
The structural representation of the system of the another kind of reactive power compensator degree of unbalancedness test that Fig. 5 provides for the embodiment of the present invention；
The structural representation of the system of the another kind of reactive power compensator degree of unbalancedness test that Fig. 6 provides for the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
As it is shown in figure 1, the method embodiments providing the test of a kind of reactive power compensator degree of unbalancedness, including:
S11, obtain the nominal parameter value of electrical equipment of reactive power compensator；
Wherein, electrical equipment includes capacitor and/or reactor.
It will be appreciated by persons skilled in the art that reactive power compensator may include that Shunt Capacitor Unit and shunt reactor group.
Concrete, as shown in Figure 2, the elementary diagram of a kind of Shunt Capacitor Unit that the embodiment of the present invention provides, Shunt Capacitor Unit includes A phase, B phase and C phase, O point represents neutral point, and the composition of each phase is identical, forms by reactor L and capacitor C, wherein every mutually of reactor L, and capacitor C is often made up of N*M single capacitor.Concrete, capacitor C is made up of N number of string section, and each string section is composed in parallel by M single capacitor, and each string section is designated as CNM.Such as, C1MRepresenting the first string section, this string section is composed in parallel by M single capacitor；C2MRepresenting the second string section, this string section is composed in parallel by M single capacitor.
It should be noted is that, in Fig. 2, namely reactor L refers to the current-limiting reactor in each phase of Shunt Capacitor Unit, and namely capacitor C refers to the Capacitor banks in each phase of Shunt Capacitor Unit.
As it is shown on figure 3, the elementary diagram of a kind of shunt reactor group of embodiment of the present invention offer, shunt reactor group includes A phase, B phase and C phase, and O point represents neutral point, and the composition of each phase is identical, forms by a reactor L.
Wherein, nominal parameter value includes: rated voltage, rated current, rated capacity, rated capacitance and inductance ratings value.
Concrete, the nominal parameter of Shunt Capacitor Unit includes: rated voltage, rated current and the rated capacity that Shunt Capacitor Unit is whole group；The rated voltage of each single capacitor, rated current, rated capacity and rated capacitance；The rated voltage of each separate unit reactor, rated current, rated capacity, inductance ratings value；According to the rated capacitance of each single capacitor, obtain the rated capacitance of each string section in Shunt Capacitor Unit and the rated capacitance of each phase；
When each string section of Shunt Capacitor Unit is composed in parallel by M single capacitor, the rated capacitance × M of the rated capacitance=single capacitor of each string section in Shunt Capacitor Unit；When Shunt Capacitor Unit often has N*M (M is number in parallel, and N is serial number) single capacitor composition mutually, the rated capacitance of each phase of Shunt Capacitor Unit=(rated capacitance × M of single capacitor)/N.
It should be noted is that, the rated voltage of each separate unit reactor refers to the specified terminal voltage of each separate unit reactor.
Wherein, it is also possible to obtain the rated capacitance of (AB, BC and AC) between any two line terminals, the rated capacitance between any two line terminals=single-phase rated capacitance/2 according to the rated capacitance of each phase.
It will be understood by those skilled in the art that, when the mode of connection of Shunt Capacitor Unit has single bridge or doube bridge, according to the rated capacitance of each arm single capacitor, the Shunt Capacitor Unit list bridge each arm rated capacitance of difference or each arm rated capacitance of Double-bridge difference can be obtained.
Often there is N*M (M is number in parallel, and N is serial number) single capacitor to consist of example, the rated capacitance × M/N of single bridge difference each arm rated capacitance=(rated capacitance × M/2 of single capacitor)/(N/2)=single capacitor mutually with Shunt Capacitor Unit；Rated capacitance × the M/N of each arm rated capacitance of Double-bridge difference=(rated capacitance × M/2 of single capacitor)/(N/4)=2 × single capacitor.
When reactive power compensator is shunt reactor group, obtain the rated voltage of shunt reactor group, rated current, rated capacity and inductance ratings value；
It should be noted is that, the rated voltage of shunt reactor group, rated current, rated capacity and inductance ratings value, identical with the rated voltage of phase each in shunt reactor group, rated current, rated capacity and inductance ratings value.
S12, measure the voltage and current of described electrical equipment, obtain the measured parameter value of described electrical equipment；
Concrete, when reactive power compensator is Shunt Capacitor Unit, measure the voltage and current of each single capacitor, obtain the actual measurement capacitance of each single capacitor；Measure the voltage and current of each separate unit reactor, obtain the actual measurement inductance value of each separate unit reactor；According to the actual measurement capacitance of each single capacitor, obtain the actual measurement capacitance between each string actual measurement capacitance of section in Shunt Capacitor Unit, the actual measurement capacitance of each phase and any two line terminals；
When each string section of Shunt Capacitor Unit is composed in parallel by M single capacitor, the actual measurement capacitance × M of the actual measurement capacitance=single capacitor of each string section in Shunt Capacitor Unit；When Shunt Capacitor Unit often has N*M (M is number in parallel, and N is serial number) single capacitor composition mutually, the actual measurement capacitance of each phase of Shunt Capacitor Unit=(the actual measurement capacitance × M of single capacitor)/N；Actual measurement capacitance between any two line terminals=single-phase actual measurement capacitance/2.
It is understood that when the mode of connection of Shunt Capacitor Unit has single bridge or doube bridge, it is possible to the actual measurement capacitance according to each arm single capacitor, obtain Shunt Capacitor Unit list bridge difference each arm actual measurement capacitance or each arm actual measurement capacitance of Double-bridge difference.
Often there is N*M (M is number in parallel, and N is serial number) single capacitor to consist of example, the actual measurement capacitance × M/N of single bridge difference each arm actual measurement capacitance=(the actual measurement capacitance × M/2 of single capacitor)/(N/2)=single capacitor mutually with Shunt Capacitor Unit；Actual measurement capacitance × the M/N of each arm actual measurement capacitance=(the actual measurement capacitance × M/2 of single capacitor)/(N/4)=2 × single capacitor of Double-bridge difference.
It should be noted is that, the each arm actual measurement capacitance of actual measurement capacitance between the actual measurement capacitance of the shnt capacitor respectively section of string, the actual measurement capacitance of each phase, any two line terminals, single bridge difference each arm actual measurement capacitance or Double-bridge difference, all can pass through to measure the voltage and current at its circuit two ends, place, calculate and obtain its actual measurement capacitance.
When reactive power compensator is shunt reactor group, measures the voltage and current of each phase in shunt reactor group, obtain the actual measurement inductance value of each phase in shunt reactor group；According to the actual measurement inductance value of each phase, obtain the actual measurement inductance value between any two line terminals, the actual measurement inductance value between any two line terminals=single-phase actual measurement inductance value/2.
Wherein, can use capacitor and inductor test instrunment that the voltage and current at capacitor and/or reactor two ends is measured, then calculate the actual measurement capacitance obtaining capacitor and/or reactor.
S13, according to described measured parameter value and described nominal parameter value, obtain the degree of unbalancedness of described reactive power compensator.
When being embodied as, owing to the composition of reactive power compensator is different, then the acquisition process of its degree of unbalancedness is by different.
One, reactive power compensator is Shunt Capacitor Unit
When reactive power compensator is Shunt Capacitor Unit, according to actual measurement capacitance and corresponding rated capacitance, and, survey inductance value and inductance ratings value, obtain the degree of unbalancedness of Shunt Capacitor Unit.
It will be understood by those skilled in the art that; the degree of unbalancedness of Shunt Capacitor Unit can adopt different parameter characterizations; specifically can be represented by the deviation of measured parameter value Yu nominal parameter, it is also possible to by representing according to the magnitude of voltage of Shunt Capacitor Unit unbalance protection signal or current value.
1, when the deviation according to measured parameter value with nominal parameter value, when obtaining the degree of unbalancedness of Shunt Capacitor Unit, the degree of unbalancedness of described Shunt Capacitor Unit includes:
According to actual measurement capacitance and the rated capacitance of described each single capacitor of each single capacitor, obtain the deviation of described actual measurement capacitance and described rated capacitance；
According to actual measurement inductance value and the inductance ratings value of described each separate unit reactor of described each separate unit reactor, obtain the deviation of described actual measurement inductance value and described inductance ratings value；
According to actual measurement inductance value and the meansigma methods of three-phase actual measurement inductance value of described each separate unit reactor, obtain the deviation of described actual measurement inductance value and the meansigma methods of described three-phase actual measurement inductance value；
According to actual measurement capacitance and the rated capacitance of described each string section of described each string section, obtain the deviation of described actual measurement capacitance and described rated capacitance；
According to actual measurement capacitance and the rated capacitance of described each phase of described each phase, obtain the deviation of described actual measurement capacitance and described rated capacitance.
It is understood that when the mode of connection of Shunt Capacitor Unit has single bridge or doube bridge, it is possible to according to the actual measurement capacitance of each arm and corresponding rated capacitance, obtain the deviation of described actual measurement capacitance and described rated capacitance.
It will be appreciated by persons skilled in the art that the degree of unbalancedness of Shunt Capacitor Unit is except representing by deviation, it is also possible to including:
According to the actual measurement capacitance between any two line terminals, obtain the ratio of the minima of actual measurement capacitance between the maximum of actual measurement capacitance between two line terminals and two line terminals.
When each phase in Shunt Capacitor Unit has multiple string section, the ratio of the minima of the maximum of the actual measurement capacitance of string section and the actual measurement capacitance of string section according to the actual measurement capacitance of each string section, can be obtained.
When the mode of connection of Shunt Capacitor Unit has single bridge or doube bridge, the ratio of the minima of the maximum of the actual measurement capacitance of each arm and the actual measurement capacitance of each arm according to the actual measurement capacitance of each arm, can be obtained.
2, when the magnitude of voltage of foundation Shunt Capacitor Unit unbalance protection signal or current value represent the degree of unbalancedness of Shunt Capacitor Unit, the degree of unbalancedness of described Shunt Capacitor Unit specifically includes:
According to the rated voltage of whole group of Shunt Capacitor Unit, the actual measurement capacitance of each phase, each separate unit reactor actual measurement inductance value, obtain the neutral point voltage drift value of Shunt Capacitor Unit；
According to the unbalance protection mode of this neutral point voltage drift value, Shunt Capacitor Unit, and the no-load voltage ratio of the transformer being connected with this Shunt Capacitor Unit, obtain magnitude of voltage or the current value of Shunt Capacitor Unit unbalance protection signal.
Wherein, the rated voltage of whole group of Shunt Capacitor Unit refers to the line voltage of whole group of Shunt Capacitor Unit, according to 1.732 times that line voltage is phase voltage, obtain the specified phase voltage of each phase of Shunt Capacitor Unit, according to the specified phase voltage of each phase, the actual measurement capacitance of each phase, each separate unit reactor actual measurement inductance value, obtain the neutral point voltage drift value of Shunt Capacitor Unit.
Shunt Capacitor Unit, according to different electric pressures, capacity, is configured with the different mode of connection, takes different protected modes.Such as: such as 10kV Shunt Capacitor Unit: take single star-shaped openings triangular voltages protection and phase voltage differential protection two ways at present; 35kV Shunt Capacitor Unit: take single star phase voltage differential protection, single star bridge-type spill current protected mode and double star neutral point unbalanced current protection mode, 110kV Shunt Capacitor Unit: take single star Double-bridge difference current protection mode etc. at present at present.
The transformer being connected with Shunt Capacitor Unit includes: voltage transformer summation current transformer.When Shunt Capacitor Unit adopts voltage protection mode, adopt voltage transformer, according to rated primary voltage and the rated secondary voltage of voltage transformer, it is thus achieved that the no-load voltage ratio of voltage transformer, now, the unbalance protection signal of Shunt Capacitor Unit is magnitude of voltage；
In like manner, when Shunt Capacitor Unit adopts current protection mode, adopt current transformer, according to rated primary current and the rated secondary current of current transformer, it is thus achieved that the no-load voltage ratio of current transformer, now, the unbalance protection signal of Shunt Capacitor Unit is current value.
Wherein, obtain Shunt Capacitor Unit degree of unbalancedness at the same time it can also be obtain Shunt Capacitor Unit reactance Rate, the reactance Rate of Shunt Capacitor Unit is the reactance value ratio with the capacitor value of Capacitor banks of current-limiting reactor.Select suitable reactance Rate, it is possible to effectively filter out harmonic wave and reduce inrush phenomenon.
Two, reactive power compensator is shunt reactor group
When reactive power compensator is shunt reactor group, the degree of unbalancedness of shunt reactor group includes:
According to actual measurement inductance value and the inductance ratings value of each phase, obtain the deviation of actual measurement inductance value and inductance ratings value；According to the meansigma methods of the actual measurement inductance value of each phase and three-phase actual measurement inductance value, obtain the deviation of actual measurement inductance value and the meansigma methods of three-phase actual measurement inductance value.
It will be appreciated by persons skilled in the art that the degree of unbalancedness of shunt reactor group is except representing by deviation, it is also possible to including:
According to the actual measurement inductance value between any two line terminals, obtain the ratio of the minima of actual measurement inductance value between the maximum of actual measurement inductance value between two line terminals and two line terminals.
In summary it can be seen, the method of reactive power compensator degree of unbalancedness provided by the invention test, by measured parameter value is carried out conformity calculation with the nominal parameter value obtained in advance, it is thus achieved that the degree of unbalancedness of reactive power compensator, it is achieved that the assessment to reactive power compensator entirety imbalance situation.Therefore, the present invention is no longer dispersion is independent between each measurement data, efficiently solves because the dispersion between each measurement data is independent, it is impossible to the situation that reactive power compensator entirety imbalance situation is estimated.
It is understood that obtain electrical equipment nominal parameter at the same time it can also be obtain the model of electrical equipment, factory number and manufacturer, to facilitate the selection to electrical equipment and purchase.
Corresponding with said method embodiment, present invention also offers the system of a kind of reactive power compensator degree of unbalancedness test.
As shown in Figure 4, embodiments provide the structural representation of the system of a kind of reactive power compensator degree of unbalancedness test, including: acquiring unit 41, measuring unit 42 and analytic unit 43,
Acquiring unit 41, for obtaining the nominal parameter value of the electrical equipment of reactive power compensator；
It should be noted is that, acquiring unit 41 can receive the nominal parameter value of the electrical equipment of staff's input.
Wherein, electrical equipment includes capacitor and/or reactor.
It will be appreciated by persons skilled in the art that reactive power compensator may include that Shunt Capacitor Unit and shunt reactor group.
Concrete, as shown in Figure 2, the elementary diagram of a kind of Shunt Capacitor Unit that the embodiment of the present invention provides, Shunt Capacitor Unit includes A phase, B phase and C phase, O point represents neutral point, and the composition of each phase is identical, forms by reactor L and capacitor C, wherein every mutually of reactor L, and capacitor C is often made up of N*M single capacitor.Concrete, capacitor C is made up of N number of string section, and each string section is composed in parallel by M single capacitor, and each string section is designated as CNM.Such as, C1MRepresenting the first string section, this string section is composed in parallel by M single capacitor；C2MRepresenting the second string section, this string section is composed in parallel by M single capacitor.
It should be noted is that, in Fig. 2, namely reactor L refers to the current-limiting reactor in each phase of Shunt Capacitor Unit, and namely capacitor C refers to the Capacitor banks in each phase of Shunt Capacitor Unit.
As it is shown on figure 3, the elementary diagram of a kind of shunt reactor group of embodiment of the present invention offer, shunt reactor group includes A phase, B phase and C phase, and O point represents neutral point, and the composition of each phase is identical, forms by a reactor L.
Wherein, nominal parameter value includes: rated voltage, rated current, rated capacity, rated capacitance and inductance ratings value.
Concrete, when reactive power compensator is Shunt Capacitor Unit, the structural representation of the system of the another kind of reactive power compensator unevenness test that the embodiment of the present invention provides as shown in Figure 5, including: first obtains subelement 51, first measures subelement 52 and the first analysis subelement 53
First obtains subelement 51, for obtaining the rated voltage of whole group of Shunt Capacitor Unit, rated current and rated capacity；The rated voltage of each single capacitor, rated current, rated capacity and rated capacitance；The rated voltage of each separate unit reactor, rated current, rated capacity, inductance ratings value；According to the rated capacitance of each single capacitor, obtain the rated capacitance of each string section in Shunt Capacitor Unit and the rated capacitance of each phase；
When each string section of Shunt Capacitor Unit is composed in parallel by M single capacitor, the rated capacitance × M of the rated capacitance=single capacitor of each string section in Shunt Capacitor Unit；When Shunt Capacitor Unit often has N*M (M is number in parallel, and N is serial number) single capacitor composition mutually, the rated capacitance of each phase of Shunt Capacitor Unit=(rated capacitance × M of single capacitor)/N.
It should be noted is that, the rated voltage of each separate unit reactor refers to the specified terminal voltage of each separate unit reactor.
Wherein, it is also possible to obtain the rated capacitance of (AB, BC and AC) between any two line terminals, the rated capacitance between any two line terminals=single-phase rated capacitance/2 according to the rated capacitance of each phase.
It will be understood by those skilled in the art that, when the mode of connection of Shunt Capacitor Unit has single bridge or doube bridge, according to the rated capacitance of each arm single capacitor, the Shunt Capacitor Unit list bridge each arm rated capacitance of difference or each arm rated capacitance of Double-bridge difference can be obtained.
Often there is N*M (M is number in parallel, and N is serial number) single capacitor to consist of example, the rated capacitance × M/N of single bridge difference each arm rated capacitance=(rated capacitance × M/2 of single capacitor)/(N/2)=single capacitor mutually with Shunt Capacitor Unit；Rated capacitance × the M/N of each arm rated capacitance of Double-bridge difference=(rated capacitance × M/2 of single capacitor)/(N/4)=2 × single capacitor.
When reactive power compensator is shunt reactor group, the structural representation of the system of the another kind of reactive power compensator unevenness test that the embodiment of the present invention provides as shown in Figure 6, including: second obtains subelement 61, second measures subelement 62 and the second analysis subelement 63
Second obtains subelement 61, for obtaining the rated voltage of shunt reactor group, rated current, rated capacity and inductance ratings value；
It should be noted is that, the rated voltage of shunt reactor group, rated current, rated capacity and inductance ratings value, identical with the rated voltage of phase each in shunt reactor group, rated current, rated capacity and inductance ratings value.
Measuring unit 42, for measuring the voltage and current of described electrical equipment, obtains the measured parameter value of described electrical equipment；
Preferably, measuring unit 42 can be capacitor and inductor test instrunment, and described capacitor and inductor test instrunment is provided with two voltage folders, for being clipped in the two ends of electrical equipment, obtains the voltage of this electrical equipment；Described capacitor and inductor test instrunment is provided with a current clamp, and described current clamp is clipped in described electrical equipment and on the loop of voltage folder composition, obtains the electric current of described electrical equipment.Described capacitor and inductor test instrunment according to the voltage and current of described electrical equipment, can obtain the measured parameter value of described electrical equipment.
Concrete, when reactive power compensator is Shunt Capacitor Unit,
First measures subelement 52, for measuring the voltage and current of each single capacitor, obtains the actual measurement capacitance of each single capacitor；Measure the voltage and current of each separate unit reactor, obtain the actual measurement inductance value of each separate unit reactor；According to the actual measurement capacitance of each single capacitor, obtain the actual measurement capacitance between each string actual measurement capacitance of section in Shunt Capacitor Unit, the actual measurement capacitance of each phase and any two line terminals；
When each string section of Shunt Capacitor Unit is composed in parallel by M single capacitor, the actual measurement capacitance × M of the actual measurement capacitance=single capacitor of each string section in Shunt Capacitor Unit；When Shunt Capacitor Unit often has N*M (M is number in parallel, and N is serial number) single capacitor composition mutually, the actual measurement capacitance of each phase of Shunt Capacitor Unit=(the actual measurement capacitance × M of single capacitor)/N；Actual measurement capacitance between any two line terminals=single-phase actual measurement capacitance/2.
It is understood that when the mode of connection of Shunt Capacitor Unit has single bridge or doube bridge, it is possible to the actual measurement capacitance according to each arm single capacitor, obtain Shunt Capacitor Unit list bridge difference each arm actual measurement capacitance or each arm actual measurement capacitance of Double-bridge difference.
Often there is N*M (M is number in parallel, and N is serial number) single capacitor to consist of example, the actual measurement capacitance × M/N of single bridge difference each arm actual measurement capacitance=(the actual measurement capacitance × M/2 of single capacitor)/(N/2)=single capacitor mutually with Shunt Capacitor Unit；Actual measurement capacitance × the M/N of each arm actual measurement capacitance=(the actual measurement capacitance × M/2 of single capacitor)/(N/4)=2 × single capacitor of Double-bridge difference.
It should be noted is that, the each arm actual measurement capacitance of actual measurement capacitance between the actual measurement capacitance of the shnt capacitor respectively section of string, the actual measurement capacitance of each phase, any two line terminals, single bridge difference each arm actual measurement capacitance or Double-bridge difference, all can pass through to measure the voltage and current at its circuit two ends, place, calculate and obtain its actual measurement capacitance.
When reactive power compensator is shunt reactor group,
Second measures subelement 62, for measuring the voltage and current of each phase in shunt reactor group, obtains the actual measurement inductance value of each phase in shunt reactor group；According to the actual measurement inductance value of each phase, obtain the actual measurement inductance value between any two line terminals；
Actual measurement inductance value between any two line terminals=single-phase actual measurement inductance value/2.
Wherein, can use capacitor and inductor test instrunment that the voltage and current at capacitor and/or reactor two ends is measured, then calculate the actual measurement capacitance obtaining capacitor and/or reactor.
Analytic unit 43, for according to described measured parameter value and described nominal parameter value, obtaining the degree of unbalancedness of described reactive power compensator.
When being embodied as, owing to the composition of reactive power compensator is different, then the acquisition process of its degree of unbalancedness is by different
One, reactive power compensator is Shunt Capacitor Unit
First analyzes subelement 53, for foundation actual measurement capacitance and corresponding rated capacitance, and, survey inductance value and inductance ratings value, obtain the degree of unbalancedness of Shunt Capacitor Unit.
It will be understood by those skilled in the art that; the degree of unbalancedness of Shunt Capacitor Unit can adopt different parameter characterizations; specifically can be represented by the deviation of measured parameter value Yu nominal parameter, it is also possible to by representing according to the magnitude of voltage of Shunt Capacitor Unit unbalance protection signal or current value.
1, when the deviation according to measured parameter value with nominal parameter value, when obtaining the degree of unbalancedness of Shunt Capacitor Unit, first analyzes subelement 53, is used for:
According to actual measurement capacitance and the rated capacitance of described each single capacitor of each single capacitor, obtain the deviation of described actual measurement capacitance and described rated capacitance；
According to actual measurement inductance value and the inductance ratings value of described each separate unit reactor of described each separate unit reactor, obtain the deviation of described actual measurement inductance value and described inductance ratings value；
According to actual measurement inductance value and the meansigma methods of three-phase actual measurement inductance value of described each separate unit reactor, obtain the deviation of described actual measurement inductance value and the meansigma methods of described three-phase actual measurement inductance value；
According to actual measurement capacitance and the rated capacitance of described each string section of described each string section, obtain the deviation of described actual measurement capacitance and described rated capacitance；
According to actual measurement capacitance and the rated capacitance of described each phase of described each phase, obtain the deviation of described actual measurement capacitance and described rated capacitance.
It is understood that when the mode of connection of Shunt Capacitor Unit has single bridge or doube bridge, it is possible to according to the actual measurement capacitance of each arm and corresponding rated capacitance, obtain the deviation of described actual measurement capacitance and described rated capacitance.
First analyzes subelement 53, it is also possible to for according to the actual measurement capacitance between any two line terminals, obtains the ratio of the minima of actual measurement capacitance between the maximum of actual measurement capacitance between two line terminals and two line terminals.
When each phase in Shunt Capacitor Unit has multiple string section, the ratio of the minima of the maximum of the actual measurement capacitance of string section and the actual measurement capacitance of string section according to the actual measurement capacitance of each string section, can be obtained.
When the mode of connection of Shunt Capacitor Unit has single bridge or doube bridge, the ratio of the minima of the maximum of the actual measurement capacitance of each arm and the actual measurement capacitance of each arm according to the actual measurement capacitance of each arm, can be obtained.
2, when the magnitude of voltage of foundation Shunt Capacitor Unit unbalance protection signal or current value represent the degree of unbalancedness of Shunt Capacitor Unit, first analyzes subelement 53, is used for:
According to the rated voltage of whole group of Shunt Capacitor Unit, the actual measurement capacitance of each phase, each separate unit reactor actual measurement inductance value, obtain the neutral point voltage drift value of Shunt Capacitor Unit；
According to the unbalance protection mode of this neutral point voltage drift value, Shunt Capacitor Unit, and the no-load voltage ratio of the transformer being connected with this Shunt Capacitor Unit, obtain magnitude of voltage or the current value of Shunt Capacitor Unit unbalance protection signal.
Wherein, the rated voltage of whole group of Shunt Capacitor Unit refers to the line voltage of whole group of Shunt Capacitor Unit, according to 1.732 times that line voltage is phase voltage, obtain the specified phase voltage of each phase of Shunt Capacitor Unit, according to the specified phase voltage of each phase, the actual measurement capacitance of each phase, each separate unit reactor actual measurement inductance value, obtain the neutral point voltage drift value of Shunt Capacitor Unit.
Shunt Capacitor Unit, according to different electric pressures, capacity, is configured with the different mode of connection, takes different protected modes.Such as: such as 10kV Shunt Capacitor Unit: take single star-shaped openings triangular voltages protection and phase voltage differential protection two ways at present; 35kV Shunt Capacitor Unit: take single star phase voltage differential protection, single star bridge-type spill current protected mode and double star neutral point unbalanced current protection mode, 110kV Shunt Capacitor Unit: take single star Double-bridge difference current protection mode etc. at present at present.
The transformer being connected with Shunt Capacitor Unit includes: voltage transformer summation current transformer.When Shunt Capacitor Unit adopts voltage protection mode, adopt voltage transformer, according to rated primary voltage and the rated secondary voltage of voltage transformer, it is thus achieved that the no-load voltage ratio of voltage transformer, now, the unbalance protection signal of Shunt Capacitor Unit is magnitude of voltage；
In like manner, when Shunt Capacitor Unit adopts current protection mode, adopt current transformer, according to rated primary current and the rated secondary current of current transformer, it is thus achieved that the no-load voltage ratio of current transformer, now, the unbalance protection signal of Shunt Capacitor Unit is current value.
Wherein, obtain Shunt Capacitor Unit degree of unbalancedness at the same time it can also be obtain Shunt Capacitor Unit reactance Rate, the reactance Rate of Shunt Capacitor Unit is the reactance value ratio with the capacitor value of Capacitor banks of current-limiting reactor.Select suitable reactance Rate, it is possible to effectively filter out harmonic wave and reduce inrush phenomenon.
Two, reactive power compensator is shunt reactor group
Second analyzes subelement 63, is used for the actual measurement inductance value according to each phase and inductance ratings value, obtains the deviation of actual measurement inductance value and inductance ratings value；According to the meansigma methods of the actual measurement inductance value of each phase and three-phase actual measurement inductance value, obtain the deviation of actual measurement inductance value and the meansigma methods of three-phase actual measurement inductance value.
It will be appreciated by persons skilled in the art that the second analysis subelement 63, it is also possible to according to the actual measurement inductance value between any two line terminals, obtain the ratio of the minima of actual measurement inductance value between the maximum of actual measurement inductance value between two line terminals and two line terminals.
It is understood that obtain electrical equipment nominal parameter at the same time it can also be obtain the model of electrical equipment, factory number and manufacturer, to facilitate the selection to electrical equipment and purchase.
In summary it can be seen, the system of reactive power compensator degree of unbalancedness provided by the invention test, by measured parameter value is carried out conformity calculation with the nominal parameter value obtained in advance, it is thus achieved that the degree of unbalancedness of reactive power compensator, it is achieved that the assessment to reactive power compensator entirety imbalance situation.Therefore, the present invention is no longer dispersion is independent between each measurement data, efficiently solves because the dispersion between each measurement data is independent, it is impossible to the situation that reactive power compensator entirety imbalance situation is estimated.
In this specification, each embodiment adopts the mode gone forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually referring to.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention.The multiple amendment of these embodiments be will be apparent from for those skilled in the art, and generic principles defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention is not intended to be limited to the embodiments shown herein, and is to fit to the widest scope consistent with principles disclosed herein and features of novelty.
Claims (2)
1. the method for a reactive power compensator degree of unbalancedness test, it is characterised in that including:
Obtain the nominal parameter value of the electrical equipment of reactive power compensator；When described reactive power compensator is Shunt Capacitor Unit, described electrical equipment is capacitor and reactor, and described nominal parameter value includes: rated voltage, rated current, rated capacity, rated capacitance and inductance ratings value；When described reactive power compensator is shunt reactor group, described electrical equipment is reactor, and described nominal parameter value includes: rated voltage, rated current, rated capacity and inductance ratings value；
Measure the voltage and current of described electrical equipment, obtain the measured parameter value of described electrical equipment；
According to described measured parameter value and described nominal parameter value, obtain the degree of unbalancedness of described reactive power compensator；
When described reactive power compensator is Shunt Capacitor Unit, the process of the nominal parameter value of the electrical equipment of described acquisition reactive power compensator includes: obtain rated voltage, rated current and the rated capacity of whole group of described Shunt Capacitor Unit；Obtain the rated voltage of each single capacitor in described Shunt Capacitor Unit, rated current, rated capacity and rated capacitance；And obtain the rated voltage of each separate unit reactor in described Shunt Capacitor Unit, rated current, rated capacity and inductance ratings value；And according to the rated capacitance of described each single capacitor, obtain the rated capacitance of each string section in described Shunt Capacitor Unit and the rated capacitance of each phase；The voltage and current of the described electrical equipment of described measurement, the process of the measured parameter value obtaining described electrical equipment includes: measure the voltage and current of described each single capacitor, obtains the actual measurement capacitance of described each single capacitor；And measure the voltage and current of described each separate unit reactor, obtain the actual measurement inductance value of described each separate unit reactor；And according to the actual measurement capacitance of described each single capacitor, obtain the actual measurement capacitance between each string actual measurement capacitance of section in described Shunt Capacitor Unit, the actual measurement capacitance of each phase and any two line terminals；
When described reactive power compensator is described Shunt Capacitor Unit, following methods is adopted to calculate the degree of unbalancedness of described reactive power compensator: according to actual measurement capacitance and the rated capacitance of described each single capacitor of described each single capacitor, to obtain the deviation of described actual measurement capacitance and described rated capacitance；According to actual measurement inductance value and the inductance ratings value of described each separate unit reactor of described each separate unit reactor, obtain the deviation of described actual measurement inductance value and described inductance ratings value；According to actual measurement inductance value and the meansigma methods of three-phase actual measurement inductance value of described each separate unit reactor, obtain the deviation of described actual measurement inductance value and the meansigma methods of described three-phase actual measurement inductance value；According to actual measurement capacitance and the rated capacitance of described each string section of described each string section, obtain the deviation of described actual measurement capacitance and described rated capacitance；With, according to actual measurement capacitance and the rated capacitance of described each phase of described each phase, obtain the deviation of described actual measurement capacitance and described rated capacitance；Or, following methods is adopted to calculate the degree of unbalancedness of described reactive power compensator: according to the actual measurement inductance value of the rated voltage of whole group of described Shunt Capacitor Unit, the actual measurement capacitance of described each phase and described each separate unit reactor, to obtain the neutral point voltage drift value of described Shunt Capacitor Unit；And according to the unbalance protection mode of described neutral point voltage drift value, described Shunt Capacitor Unit, and the no-load voltage ratio of the transformer being connected with described Shunt Capacitor Unit, obtain magnitude of voltage or the current value of described Shunt Capacitor Unit unbalance protection signal；
When described reactive power compensator is shunt reactor group, the process of the nominal parameter value of the electrical equipment of described acquisition reactive power compensator includes: obtain the rated voltage of described shunt reactor group, rated current, rated capacity and inductance ratings value；The voltage and current of the described electrical equipment of described measurement, the process of the measured parameter value obtaining described electrical equipment includes: measure the voltage and current of each phase in described shunt reactor group, obtains the actual measurement inductance value of each phase in described shunt reactor group；And according to the actual measurement inductance value of described each phase, obtain the actual measurement inductance value between any two line terminals；Described according to described measured parameter value with described nominal parameter value, the process of the degree of unbalancedness obtaining described reactive power compensator includes: according to actual measurement inductance value and the described inductance ratings value of described each phase, obtain described actual measurement inductance value and the deviation of described inductance ratings value；And according to the meansigma methods of the actual measurement inductance value of described each phase and three-phase actual measurement inductance value, obtain the deviation of described actual measurement inductance value and the meansigma methods of described three-phase actual measurement inductance value.
2. the system of a reactive power compensator degree of unbalancedness test, it is characterised in that including:
Acquiring unit, for obtaining the nominal parameter value of the electrical equipment of reactive power compensator；When described reactive power compensator is Shunt Capacitor Unit, described electrical equipment is capacitor and reactor, and described nominal parameter value includes: rated voltage, rated current, rated capacity, rated capacitance and inductance ratings value；When described reactive power compensator is shunt reactor group, described electrical equipment is reactor, and described nominal parameter value includes: rated voltage, rated current, rated capacity and inductance ratings value；
Measuring unit, for measuring the voltage and current of described electrical equipment, obtains the measured parameter value of described electrical equipment；
Analytic unit, for according to described measured parameter value and described nominal parameter value, obtaining the degree of unbalancedness of described reactive power compensator；Wherein, when described reactive power compensator is Shunt Capacitor Unit; the degree of unbalancedness of described reactive power compensator represents especially by the deviation of measured parameter value Yu nominal parameter, or by representing according to the magnitude of voltage of Shunt Capacitor Unit unbalance protection signal or current value；
When described reactive power compensator is Shunt Capacitor Unit, described acquiring unit includes the first acquisition subelement, and described measuring unit includes the first measurement subelement, and described analytic unit includes the first analysis subelement；
Described first obtains subelement, for obtaining rated voltage, rated current and the rated capacity of whole group of described Shunt Capacitor Unit；The rated voltage of each single capacitor, rated current, rated capacity and rated capacitance；And the rated voltage of each separate unit reactor, rated current, rated capacity and inductance ratings value；And according to the rated capacitance of described each single capacitor, obtain the rated capacitance of each string section in described Shunt Capacitor Unit and the rated capacitance of each phase；
Described first measures subelement, for measuring the voltage and current of described each single capacitor, obtains the actual measurement capacitance of described each single capacitor；And measure the voltage and current of described each separate unit reactor, obtain the actual measurement inductance value of described each separate unit reactor；And according to the actual measurement capacitance of described each single capacitor, obtain the actual measurement capacitance between each string actual measurement capacitance of section in described Shunt Capacitor Unit, the actual measurement capacitance of each phase and any two line terminals；
Described first analyzes subelement, for adopting following methods to calculate the degree of unbalancedness of described reactive power compensator: according to actual measurement capacitance and the rated capacitance of described each single capacitor of described each single capacitor, obtain the deviation of described actual measurement capacitance and described rated capacitance；According to actual measurement inductance value and the inductance ratings value of described each separate unit reactor of described each separate unit reactor, obtain the deviation of described actual measurement inductance value and described inductance ratings value；According to actual measurement inductance value and the meansigma methods of three-phase actual measurement inductance value of described each separate unit reactor, obtain the deviation of described actual measurement inductance value and the meansigma methods of described three-phase actual measurement inductance value；According to actual measurement capacitance and the rated capacitance of described each string section of described each string section, obtain the deviation of described actual measurement capacitance and described rated capacitance；With, according to actual measurement capacitance and the rated capacitance of described each phase of described each phase, obtain the deviation of described actual measurement capacitance and described rated capacitance；Or, following methods is adopted to calculate the degree of unbalancedness of described reactive power compensator: according to the actual measurement inductance value of the rated voltage of whole group of described Shunt Capacitor Unit, the actual measurement capacitance of described each phase and described each separate unit reactor, to obtain the neutral point voltage drift value of described Shunt Capacitor Unit；And according to the unbalance protection mode of described neutral point voltage drift value, described Shunt Capacitor Unit, and the no-load voltage ratio of the transformer being connected with described Shunt Capacitor Unit, obtain magnitude of voltage or the current value of described Shunt Capacitor Unit unbalance protection signal；
When described reactive power compensator is shunt reactor group, described acquiring unit includes the second acquisition subelement, and described measuring unit includes the second measurement subelement, and described analytic unit includes the second analysis subelement；
Described second obtains subelement, for obtaining the rated voltage of described shunt reactor group, rated current, rated capacity and inductance ratings value；
Described second measures subelement, for measuring the voltage and current of each phase in described shunt reactor group, obtains the actual measurement inductance value of each phase in described shunt reactor group；And according to the actual measurement inductance value of described each phase, obtain the actual measurement inductance value between any two line terminals；
Described second analyzes subelement, is used for the actual measurement inductance value according to described each phase and described inductance ratings value, obtains described actual measurement inductance value and the deviation of described inductance ratings value；And according to the meansigma methods of the actual measurement inductance value of described each phase and three-phase actual measurement inductance value, obtain the deviation of described actual measurement inductance value and the meansigma methods of described three-phase actual measurement inductance value.
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