CN108832864A - A kind of drainage pumping stations asynchronous motor reactive compensation analysis calculation method - Google Patents
A kind of drainage pumping stations asynchronous motor reactive compensation analysis calculation method Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
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Abstract
The present invention discloses a kind of drainage pumping stations asynchronous motor reactive compensation analysis calculation method, and drainage pumping stations asynchronous motor reactive compensation analysis calculation method includes：The pump shaft power in the pump rotary speed and drainage pumping stations operation range of lift of drainage pumping stations is obtained first, according to pump shaft power maximum in the pump shaft power, and pump rotary speed, determine the rated power of asynchronous motor, rated power factor, rated efficiency, the load factor section of asynchronous motor is calculated again, obtain target power factor range, according to the load factor section of asynchronous motor, rated power, rated power factor, rated efficiency and target power factor range, calculate the reactive compensation capacity range that asynchronous motor needs, determine satisfied reactive compensation capacity.The present invention can analyze drainage pumping stations reactive compensation, and the local compensation value of power factor is obtained according to the amount of capacity of asynchronous motor and the method for operation.
Description
Technical field
The present invention relates to asynchronous motor reactive compensation analysis technical fields, more particularly to a kind of asynchronous electricity in drainage pumping stations
Motivation reactive compensation analysis calculation method.
Background technique
In recent years, with the fast development of urbanization and frequently occurring for extreme weather, urban storm flood is increasingly
Aggravation.To ensure that social safety is steady, Urban disasters reduction moving ability is improved, more and more drainage pumping stations are modified or create.It is asynchronous
Motor is low by high reliablity, maintenance convenience, cost of investment, is used widely in drainage pumping stations.Due to asynchronous electric
Machine is inductive load, needs to consume certain lagging reactive power when operating normally, natural power factor is low, leads to power grid
Power supply quality decline and active loss increase.Therefore, it is necessary to increase reactive power compensator to asynchronous motor to improve function
Rate factor had not only met examination of the power supply department to power factor, but also has reduced the operating cost of user.
The local compensation mode of motor stator side shunt capacitor is typically employed in currently available technology come the row of raising
The power factor of flooded pumping plant asynchronous motor can not analyze drainage pumping stations reactive compensation, can not be according to asynchronous electric
The amount of capacity of machine obtains the local compensation value of satisfied power factor with the method for operation.
Summary of the invention
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of drainage pumping stations asynchronous motors
Reactive compensation analysis calculation method in the prior art can not analyze drainage pumping stations reactive compensation for solving, can not
The problem of local compensation value according to the amount of capacity of asynchronous motor and the method for operation to obtain power factor.
In order to achieve the above objects and other related objects, the present invention provides a kind of drainage pumping stations asynchronous motor reactive compensation
Analysis calculation method, the drainage pumping stations asynchronous motor reactive compensation analysis calculation method include：Obtain the water of drainage pumping stations
Multiple pump shaft power P in revolution speed and drainage pumping stations operation range of lift；According to maximum in the pump shaft power P
Pump shaft power and pump rotary speed determine the rated power P of asynchronous motore, rated power factorRated efficiency ηe；
According to the rated power P of pump shaft power P and asynchronous motor in operation range of lifte, asynchronous motor is calculated
Load factor section [β1,β2], wherein β1Indicate the load factor lower limit of asynchronous motor, β2Indicate the load factor of asynchronous motor
The upper limit；Obtain target power factor rangeWherein,Indicate target power factor lower limit,Indicate mesh
Mark the power factor upper limit；According to the load factor section [β of asynchronous motor1,β2], rated power Pe, rated power factorRated efficiency ηeAnd target power factor rangeCalculate the reactive compensation that asynchronous motor needs
Range of capacity；Within the scope of reactive compensation capacity, satisfied reactive compensation capacity is determined.
As a preferred solution of the present invention, operation lift in the drainage pumping stations includes highest lift, rated lift, most
Low lift.
As a preferred solution of the present invention, described according to the pump shaft power P run in range of lift and asynchronous
The rated power P of motore, the load factor section [β of asynchronous motor is calculated1,β2] include：The load of asynchronous motor
The calculation formula of rate is β=P/Pe, obtain the load factor section [β of asynchronous motor1,β2], wherein β indicates asynchronous motor
Load factor.
As a preferred solution of the present invention, the target power factor rangeFor [0.9,1.0].
As a preferred solution of the present invention, the target power factor rangeFor [0.92,0.97].
As a preferred solution of the present invention, the target power factor rangeFor [0.9,0.97].
As a preferred solution of the present invention, the load factor section [β according to asynchronous motor1,β2], specified function
Rate Pe, rated power factorRated efficiency ηeAnd target power factor rangeCalculate asynchronous electric
Machine need reactive compensation capacity range include：
Estimate the no-load current of asynchronous motor：
Wherein, I0Indicate the no-load current of asynchronous motor, IeIndicate the rated current of asynchronous motor, k indicates to calculate ginseng
Number,
Calculate the actual consumption active power of asynchronous motor：
Pb=P+ ∑ P=P/ η；
Wherein, PbIndicate the actual consumption active power of asynchronous motor, P=β Pe, the load of β expression asynchronous motor
Rate, ∑ P indicate that the active power loss of asynchronous motor, η indicate the efficiency of asynchronous motor；
Calculate asynchronous motor reactive power Q be：
Q=Q0+β2(Qe-Q0)；
Wherein,UeIndicate the voltage rating of asynchronous motor；
The power-factor angle tangent value of asynchronous motor after calculating reactive compensation：
Wherein,The power-factor angle tangent value of asynchronous motor after indicating reactive compensation, QbIndicate reactive compensation
The reactive power of asynchronous motor afterwards, PbIndicate the actual consumption active power of asynchronous motor, QxIndicate asynchronous motor
Reactive power compensation capacity；
Under the load factor β of asynchronous motor in arbitrary, the power factor after carrying out reactive compensation meets target power factor
RangeThe then power-factor angle tangent value of the asynchronous motor after reactive compensationIt needs to meetI.e.：
Meet under the load factor β of asynchronous motor in arbitrary
Wherein,The power-factor angle tangent value lower limit of asynchronous motor after indicating reactive compensation,Indicate without
The power-factor angle tangent value upper limit of the compensated asynchronous motor of function；
The then reactive power compensation capacity Q of asynchronous motorxMeet：
It enables
Wherein, QUnderfillIndicate the load factor β ∈ [β of asynchronous motor in arbitrary1,β2] in the case where, guarantee power after compensation
Factor is not less than the reactive power compensation flow function of target power factor lower limit；QOverfillIndicate the load of asynchronous motor in arbitrary
Rate β ∈ [β1,β2] in the case where, guarantee that power factor is no more than the reactive power compensation amount of the target power factor upper limit after compensating
Function；
It calculatesIn [β1,β2] on maximum value QUnderfill max,
In [β1,β2] on minimum value QOverfill min,
The reactive compensation capacity range that asynchronous motor needs is QUnderfill max≤Qx≤QOverfill min。
The present invention also provides a kind of storage mediums, are stored with program instruction, and described program instruction is performed in realization
The drainage pumping stations asynchronous motor reactive compensation analysis calculation method stated.
The present invention also provides a kind of electronic equipment, including processor and memory, the memory is stored with program and refers to
It enables, the processor operation program instruction realizes above-mentioned drainage pumping stations asynchronous motor reactive compensation analysis calculation method.
As described above, a kind of drainage pumping stations asynchronous motor reactive compensation analysis calculation method of the invention, has following
Beneficial effect：
1, the present invention determines the parameters of asynchronous motor, including rated power, rated power factor, specified effect first
The load factor section of asynchronous motor is calculated in rate, obtains the target power factor range for meeting grid requirements, finally calculates
The reactive compensation capacity range that asynchronous motor needs.The present invention can analyze drainage pumping stations reactive compensation, Neng Gougen
The local compensation value of power factor is obtained according to the amount of capacity and the method for operation of asynchronous motor.
2, drainage pumping stations asynchronous motor reactive compensation analysis calculation method convenience of calculation of the present invention, it is quick, can
It is good depending on changing effect.
Detailed description of the invention
Fig. 1 is shown as the flow diagram of drainage pumping stations asynchronous motor reactive compensation analysis calculation method of the invention.
Fig. 2 is shown as reactive power compensation analytical calculation interface of the invention.
Fig. 3 is shown as the reactive power compensation analysis result figure of certain drainage pumping stations of the invention.
Fig. 4 is shown as the reactive compensation analytical calculation warning prompt result figure of certain drainage pumping stations of the invention.
Component label instructions
S1~S6 step
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.It should be noted that in the absence of conflict, following embodiment and implementation
Feature in example can be combined with each other.
It should be noted that illustrating the basic structure that only the invention is illustrated in a schematic way provided in following embodiment
Think, only shown in schema then with related component in the present invention rather than component count, shape and size when according to actual implementation
Draw, when actual implementation kenel, quantity and the ratio of each component can arbitrarily change for one kind, and its assembly layout kenel
It is likely more complexity.
The present embodiment provides a kind of drainage pumping stations asynchronous motor reactive compensation analysis calculation methods, and the present invention can be to row
Flooded pumping plant reactive compensation is analyzed, and can obtain power factor according to the amount of capacity of asynchronous motor and the method for operation
Local compensation value.
Present embodiments providing a kind of drainage pumping stations asynchronous motor reactive compensation analysis calculation method please specifically join
Fig. 1 is read, the drainage pumping stations asynchronous motor reactive compensation analysis calculation method includes：
Multiple pump shaft power P in S1, the pump rotary speed for obtaining drainage pumping stations and drainage pumping stations operation range of lift；
S2, according to maximum pump shaft power and pump rotary speed in the pump shaft power P, determine the volume of asynchronous motor
Determine power Pe, rated power factorRated efficiency ηe；
S3, according to operation range of lift in pump shaft power P and asynchronous motor rated power Pe, it is calculated
Load factor section [the β of asynchronous motor1,β2], wherein β1Indicate the load factor lower limit of asynchronous motor, β2Indicate asynchronous electric
The load factor upper limit of machine；
S4, target power factor range is obtainedWherein,Indicate target power factor lower limit,
Indicate the target power factor upper limit；
S5, the load factor section [β according to asynchronous motor1,β2], rated power Pe, rated power factorIt is specified
Efficiency etaeAnd target power factor rangeCalculate the reactive compensation capacity range that asynchronous motor needs；
S6, within the scope of reactive compensation capacity, determine satisfied reactive compensation capacity.
Specifically, in the present embodiment, after the reactive compensation capacity range that asynchronous motor needs are calculated, knot
General-purpose capacitor product capacity is closed, a capacitor within the scope of the reactive compensation capacity that the asynchronous motor needs is combined into
Device group, as satisfied reactive compensation capacity, take the smaller value in range as far as possible.
Specifically, in the present embodiment, operation lift in the drainage pumping stations includes highest lift, rated lift, minimum raises
Journey.
Specifically, by taking certain drainage pumping stations as an example, the load factor being likely to occur to the operation of main asynchronous motor is analyzed, should
Drainage pumping stations design discharge is 50m3/ s is unidirectional drainage pumping stations, if 4 silo infusion pumps, single pump designs flow 12.5m3/ s,
Revolving speed is 125r/min, and using upright parallel shaft gear deceleration transmission mode, maximum operational mode is that 4 units are run simultaneously,
Drainage pumping stations feature runs lift referring to table 1.
Table 1：
| Lift | Net lift/m | Total (pumping) head/m |
| Highest lift | 2.68 | 2.98 |
| Rated lift | 1.48 | 1.88 |
| Minimum lift | 0.00 | 0.50 |
According to design specification, maximum that the capacity of land reclamation pump station owner's asynchronous motor should be likely to occur by water drainage water pump operation
Shaft power apolegamy, and there are certain deposit, reserve factor is preferably 1.05~1.10, and drainage pumping stations run the water in range of lift
Pump shaft power P calculation formula isWherein, K is reserve factor；ρ is the density of fluid, unit kN/m3；G is
Acceleration of gravity, unit m/s2；QpFor the flow for the water pump that drains flooded fields, unit m3/s；H is the lift of water drainage water pump, unit m；ηpFor row
The efficiency of excess water pump；ηitFor the efficiency of transmission device.
Each operating condition shaft power calculated result of water pump of draining flooded fields is referring to table 2, it is contemplated that the importance and asynchronous electric of drainage pumping stations
The suitable selection standard series of the capacity of machine, asynchronous motor power matched with water drainage water pump are taken as 560kW.
Table 2：
| Operating condition | H | Qp | ηp | ηit | K | P |
| Highest lift operating condition | 2.98 | 8.88 | 0.5638 | 0.97 | 1.10 | 522.1 |
| Rated lift operating condition | 1.88 | 12.50 | 0.7212 | 0.97 | 1.10 | 362.5 |
| Minimum lift operating condition | 0.50 | 16.20 | 0.6051 | 0.97 | 1.10 | 148.9 |
In conjunction with the calculated result of table 2, the load factor range that drainage pumping stations operation is likely to occur is 0.265~0.932, design
Lift operating condition load factor is 0.647.
The rated power P of the pump shaft power P and asynchronous motor according in operation range of lifte, calculate
To the load factor section [β of asynchronous motor1,β2] include：The calculation formula of the load factor of asynchronous motor is β=P/Pe, obtain
Load factor section [the β of asynchronous motor1,β2], wherein the load factor of β expression asynchronous motor.
Grid requirements user side power factor is between 0.9~1.0, therefore the target power factor rangeFor [0.9,1.0].
Specifically, the load factor section [β according to asynchronous motor1,β2], rated power Pe, rated power factorRated efficiency ηeAnd target power factor rangeThe reactive compensation that asynchronous motor needs is calculated to hold
Measuring range includes：
The no-load current of asynchronous motor is estimated according to formula (1)：
Wherein,I0Indicate the no-load current of asynchronous motor, IeIndicate asynchronous motor
Rated current, k indicate calculating parameter；
The actual consumption active power of asynchronous motor is formula (2),
Pb=P+ ∑ P=P/ η (2)
Wherein,∑ P indicates the active power loss of asynchronous motor, P0Indicate asynchronous motor
Unloaded active power loss, ∑ PeIndicate the active power loss when nominal load of asynchronous motor；
The reactive power of asynchronous motor is formula (3),
Q=Q0+β2(Qe-Q0) (3)
Wherein,UeIndicate the voltage rating of asynchronous motor；
The power-factor angle tangent value of asynchronous motor after reactive compensation is formula (4),
Wherein,UeIndicate the voltage rating of asynchronous motor；
The power-factor angle tangent value of asynchronous motor after reactive compensation is formula (5),
Wherein,The power-factor angle tangent value of asynchronous motor after indicating reactive compensation, QbIndicate reactive compensation
The reactive power of asynchronous motor afterwards, PbIndicate the actual consumption active power of asynchronous motor, QxIndicate asynchronous motor
Reactive power compensation capacity；
Under the load factor β of asynchronous motor in arbitrary, the power factor after carrying out reactive compensation meets target power factor
RangeThe then power-factor angle tangent value of the asynchronous motor after reactive compensationIt needs to meetI.e.：
Meet under the load factor β of asynchronous motor in arbitrary
Wherein,The power-factor angle tangent value lower limit of asynchronous motor after indicating reactive compensation,Indicate without
The power-factor angle tangent value upper limit of the compensated asynchronous motor of function；
In order to guarantee compensation effect, takeTherefore
The then reactive power compensation capacity Q of asynchronous motorxMeet：
It enables
Wherein, QUnderfillIn the case where the load factor β for indicating asynchronous motor in arbitrary, power factor is not small after guaranteeing compensation
In the reactive power compensation flow function of target power factor lower limit；QOverfillThe case where indicating the load factor β of asynchronous motor in arbitrary
Under, guarantee that power factor is no more than the reactive power compensation flow function of the target power factor upper limit after compensating；
QUnderfillAnd QOverfillIt is two functions of definition, using load factor β as the quadratic equation with one unknown of variable.
Obtain QUnderfill=(Qe-Q0)β2-0.484Pe/ηeβ+Q0In [β1,β2] on maximum value QUnderfill max,
QOverfill=(Qe-Q0)β2-0.251Pe/ηeβ+Q0In [β1,β2] on minimum value QOverfill min,
After making compensationTo load factor β1≤β≤β2Shi Chengli, as long as making QOwe max≤Qx≤QCross min,
Wherein, QOwe maxTake β1≤β≤β2When QUnderfillMaximum value, QCross minTake β1≤β≤β2When QOverfillMinimum value.
If β1≤β≤β2When, QOwe max> QCross min, then illustrate that the local compensation mode of shunt capacitor cannot the row of fully meeting
The service requirement of flooded pumping plant asynchronous motor, at this time it is contemplated that using centralized compensation mode or allowing power factor under extreme operating condition
?In range, if β1≤β≤β2When,It is then to prevent self-excitation overvoltage can
Capacitor is connected in parallel by consideration by fling-cut switch and motor.
The present invention also provides a kind of storage mediums, are stored with program instruction, and described program instruction is performed in realization
The drainage pumping stations asynchronous motor reactive compensation analysis calculation method stated.
A kind of electronic equipment, including processor and memory, the memory are stored with program instruction, the processor fortune
Above-mentioned drainage pumping stations asynchronous motor reactive compensation analysis calculation method is realized in line program instruction.
It is analyzed according to above-mentioned drainage pumping stations reactive compensation, the present invention is based on Matlab_GUI platform, to realize drainage pumping stations different
The calculating process for walking motor reactive compensation analysis calculation method keeps analytical calculation more convenient, quick, and effect of visualization is good.
Based on Matlab_GUI platform, designs drainage pumping stations reactive compensation analytical calculation interface and be detailed in Fig. 2, it is asynchronous in figure
Three motor parameter, pump motor load factor, target power factor panels are input module, reactive compensation calculated result face
Plate is analytical calculation output module, and power factor and load factor relation curve are analytical calculation curve of output.
See Table 3 for details for the nominal parameter of water pump asynchronous motor；
From figure 3, it can be seen that according to 194.707 < QxAfter < 213.816 carries out reactive compensation, the power of motor because
Number meetsIt can be set up when to 0.265≤β of load factor≤0.932.Figure 4, it is seen that working as asynchronous electricity
When motivation load factor is lower than 0.265, it is impossible to be metThe reactive compensation capacity that perseverance is set up, analysis meter
Calculate existing warning prompt.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (9)
1. a kind of drainage pumping stations asynchronous motor reactive compensation analysis calculation method, which is characterized in that the drainage pumping stations are asynchronous
Motor reactive compensation analysis calculation method includes：
Obtain multiple pump shaft power P in the pump rotary speed and drainage pumping stations operation range of lift of drainage pumping stations；
According to maximum pump shaft power and pump rotary speed in the pump shaft power P, the rated power of asynchronous motor is determined
Pe, rated power factorRated efficiency ηe；
According to the rated power P of pump shaft power P and asynchronous motor in operation range of lifte, asynchronous electric is calculated
Load factor section [the β of machine1,β2], wherein β1Indicate the load factor lower limit of asynchronous motor, β2Indicate the load of asynchronous motor
The rate upper limit；
Obtain target power factor rangeWherein,Indicate target power factor lower limit,Indicate target
The power factor upper limit；
According to the load factor section [β of asynchronous motor1,β2], rated power Pe, rated power factorRated efficiency ηe
And target power factor rangeCalculate the reactive compensation capacity range that asynchronous motor needs；
Within the scope of reactive compensation capacity, satisfied reactive compensation capacity is determined.
2. a kind of drainage pumping stations asynchronous motor reactive compensation analysis calculation method according to claim 1, feature exist
In：The drainage pumping stations operation lift includes highest lift, rated lift, minimum lift.
3. a kind of drainage pumping stations asynchronous motor reactive compensation analysis calculation method according to claim 2, feature exist
In：The rated power P of the pump shaft power P and asynchronous motor according in operation range of lifte, it is calculated asynchronous
Load factor section [the β of motor1,β2] include：
The calculation formula of the load factor of asynchronous motor is β=P/Pe, obtain the load factor section [β of asynchronous motor1,β2],
In, β indicates the load factor of asynchronous motor.
4. a kind of drainage pumping stations asynchronous motor reactive compensation analysis calculation method according to claim 3, feature exist
In：The target power factor rangeFor [0.9,1.0].
5. a kind of drainage pumping stations asynchronous motor reactive compensation analysis calculation method according to claim 4, feature exist
In：The target power factor rangeFor [0.92,0.97].
6. a kind of drainage pumping stations asynchronous motor reactive compensation analysis calculation method according to claim 4, feature exist
In：The target power factor rangeFor [0.9,0.97].
7. a kind of drainage pumping stations asynchronous motor reactive compensation analysis calculation method according to claim 6, feature exist
In：Load factor section [the β according to asynchronous motor1,β2], rated power Pe, rated power factorSpecified effect
Rate ηeAnd target power factor rangeCalculating the reactive compensation capacity range that asynchronous motor needs includes：
Estimate the no-load current of asynchronous motor：
Wherein, I0Indicate the no-load current of asynchronous motor, IeIndicating the rated current of asynchronous motor, k indicates calculating parameter,
Calculate the actual consumption active power of asynchronous motor：
Pb=P+ ∑ P=P/ η；
Wherein, PbIndicate the actual consumption active power of asynchronous motor, P=β Pe, the load factor of β expression asynchronous motor, ∑ P
Indicate that the active power loss of asynchronous motor, η indicate the efficiency of asynchronous motor；
Calculate asynchronous motor reactive power Q be：
Q=Q0+β2(Qe-Q0)；
Wherein,UeIndicate the voltage rating of asynchronous motor；
The power-factor angle tangent value of asynchronous motor after calculating reactive compensation：
Wherein,The power-factor angle tangent value of asynchronous motor after indicating reactive compensation, QbAfter indicating reactive compensation
The reactive power of asynchronous motor, PbIndicate the actual consumption active power of asynchronous motor, QxIndicate the idle of asynchronous motor
Power compensation capacity；
Under the load factor β of asynchronous motor in arbitrary, the power factor after carrying out reactive compensation meets target power factor rangeThe then power-factor angle tangent value of the asynchronous motor after reactive compensationIt needs to meet
I.e.：
Meet under the load factor β of asynchronous motor in arbitrary
Wherein,The power-factor angle tangent value lower limit of asynchronous motor after indicating reactive compensation,Indicate idle benefit
The power-factor angle tangent value upper limit of asynchronous motor after repaying；
The then reactive power compensation capacity Q of asynchronous motorxMeet：
It enables
Wherein, QUnderfillIndicate the load factor β ∈ [β of asynchronous motor in arbitrary1,β2] in the case where, guarantee power factor after compensation
Not less than the reactive power compensation flow function of target power factor lower limit；QOverfillIndicate the load factor β ∈ of asynchronous motor in arbitrary
[β1,β2] in the case where, guarantee that power factor is no more than the reactive power compensation flow function of the target power factor upper limit after compensating；
It calculatesIn [β1,β2] on maximum value QUnderfill max,
In [β1,β2] on minimum value QOverfill min,
The reactive compensation capacity range that asynchronous motor needs is QUnderfill max≤Qx≤QOverfill min。
8. a kind of storage medium, is stored with program instruction, it is characterised in that：Described program instruction is performed realization as right is wanted
It asks 1 to the described in any item drainage pumping stations asynchronous motor reactive compensation analysis calculation methods of claim 7.
9. a kind of electronic equipment, including processor and memory, the memory are stored with program instruction, it is characterised in that：Institute
Processor operation program instruction is stated to realize such as claim 1 to the described in any item drainage pumping stations asynchronous motors of claim 7
Reactive compensation analysis calculation method.
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