CN105223395B - Reactive energy measurement method for generation of electricity by new energy station - Google Patents
Reactive energy measurement method for generation of electricity by new energy station Download PDFInfo
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- CN105223395B CN105223395B CN201510709263.4A CN201510709263A CN105223395B CN 105223395 B CN105223395 B CN 105223395B CN 201510709263 A CN201510709263 A CN 201510709263A CN 105223395 B CN105223395 B CN 105223395B
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Abstract
The invention provides a kind of reactive energy measurement method for generation of electricity by new energy station, including obtain scope range of the fluctuation of voltage and line power exhaustion range；Calculating meets scope range of the fluctuation of voltage and meets the power factor section of line power exhaustion range；Line power is calculated in overlapping region therebetween minimum optimum power factor is lost；Measure the capacity of idle power and realtime power factor during the work of power station；Compare the relation of realtime power factor and optimum power factor, measure reactive power consumption electricity and reactive-load compensation electricity；The difference between reactive power consumption electricity and reactive-load compensation electricity is calculated, obtains the actual reactive energy at generation of electricity by new energy station.The contribution and local reactive power compensation that rational differentiation power station of the invention is idle to balance system, the foundation of the reactive measurement at generation of electricity by new energy station is provided, the idle output in power station is accurately and efficiently measured, improves the enthusiasm that power station carries out reactive-load compensation, improves the quality of power network electric energy indirectly.
Description
Technical field
The invention belongs to electric energy metrical field, and in particular to a kind of reactive energy measurement side for generation of electricity by new energy station
Method.
Background technology
With the development of national economy and science and technology, people more and more begin to focus on environmental problem.Due to haze, environment
The getting worse of the problems such as pollution, country are also increasing for the input of environmental improvement, environmental protection.Grid-connected power generation system
With its intimate no pollution, the characteristic of zero-emission, the accreditation and favor of country are progressively received.
But with increasing new energy power generation grid-connection, intermittent, randomness and punching possessed by generation of electricity by new energy
Hitting property brings huge challenge to the reliability service of network system and the guarantee of the quality of power supply.Therefore power network not only needs to pay close attention to
The active energy of user is supplied to, also to pay close attention to the reactive energy for having considerable influence to the quality of power supply：If System Reactive Power electric energy
Surplus, then easily cause overtension, not only cause electric energy loss, also increase the spoilage of electrical equipment；But if power network
System Reactive Power electric energy deficiency, will cause line voltage to decline；Cause power network load capacity insufficient when serious, cause whole system to collapse
Burst, partial electric grid off-the-line.
At present, generation of electricity by new energy station typically has two kinds of mode of operations：Pattern of generating electricity by way of merging two or more grid systems and grid-connected use power mode.It is existing
The reactive measurement method to generation of electricity by new energy station by new energy power generation grid-connection System Reactive Power compensation with the benefit idle on the spot of itself
Repay and all include the consumption of grid-connected power generation system own reactive；This method can not sufficiently utilize grid-connected power generation system its own advantages
Power network is reasonably regulated and controled, can not also encourage this kind of Double-Direction User of new energy power generation grid-connection to put into operation the product of reactive-load compensation equipment
Polarity, so as to realize that System Reactive Power balances.
The content of the invention
It is an object of the invention to provide a kind of idle output that can truly reflect generation of electricity by new energy station, can accurately count
Measure the reactive energy measurement method for generation of electricity by new energy station of generation of electricity by new energy station reactive power.
This reactive energy measurement method for generation of electricity by new energy station provided by the invention, comprises the following steps：
S1. when acquisition generation of electricity by new energy station generates electricity by way of merging two or more grid systems, scope range of the fluctuation of voltage and circuit when grid requirements generate electricity by way of merging two or more grid systems
Power attenuation scope；
S2. the scope range of the fluctuation of voltage and line power exhaustion range that step S1 in root is obtained, calculate meet voltage wave respectively
First power factor section of dynamic scope and the second power factor section for meeting line power exhaustion range；
S3. the first power factor section and the second power factor section obtained according to step S2, acquisition weigh between the two
Folded region, calculates optimum power factor when circuit power attenuation is minimum in overlapping region；
S4. the capacity of idle power of generation of electricity by new energy station at work, and realtime power factor during writing task are measured；
S5. the optimum power factor obtained according to the realtime power factor that step S4 is obtained with step S3, counts real-time work(
It is idle when reactive power consumption electricity and realtime power factor when rate factor is less than optimum power factor are more than optimum power factor
Compensate electricity；
S6. the difference between reactive power consumption electricity and reactive-load compensation electricity is calculated, obtains the actual nothing at generation of electricity by new energy station
Work(electric energy.
Calculating described in step S2 meets the first power factor section of scope range of the fluctuation of voltage, to be carried out using following formula
Calculate：
WhereinFor power factor；IFor corresponding electric current, current potential A；XFor reactance；RFor impedance；UFor the line of transmission
Voltage, unit kV；εFor scope range of the fluctuation of voltage percentage；
The the second power factor section for meeting line power exhaustion range described in step S2, to be carried out at last using following
Calculate：
WhereinFor power factor；PFor the active power of conveying, unit kW；RFor impedance；UFor the line electricity of transmission
Pressure, unit kV；ηFor power swing range percentage；
Power factor described in step S6, to be calculated at last using following：
WhereinFor power factor；PFor the active power of conveying, unit kW；QFor the reactive power for exchange,
Unit is kvar.
Foundation national legislation described in step S6 is charged or compensated, and is specifically comprised the following steps：
1）If reactive power consumption electricity ratio reactive-load compensation electricity is big, according to power factor and national legislation《Power factor is adjusted
Whole electricity charge method》Specified in power factor size, carry out idle charge to power plant according to national legislation；
2）If reactive power consumption electricity ratio reactive-load compensation electricity is small, the regulation according to power plant's online contract is mended to power plant
Repay.
The reactive energy measurement device of a kind of reactive energy measurement method for generation of electricity by new energy station described in application, bag
Include the multifunctional electric energy meter that can store load curve, data electric quantity collector and industrial computer；Multifunctional electric energy meter is used to measure
The electric energy in power station；Data electric quantity collector is used to gather the data of multifunctional electric energy meter and uploads to industrial computer；Industrial computer is adopted
The reactive energy in power station is calculated with the described reactive energy measurement method for generation of electricity by new energy station.
Described reactive energy measurement device, in addition to divide power factor electric energy meter, point power factor electric energy meter is used to remember
Capacity of idle power and power factor when record power factor is less than optimum power factor are more than capacity of idle power during optimum power factor.
The present invention records idle electricity by the optimal power factor of computational theory, and according to optimum power factor by stages
Amount, generation of electricity by new energy the station contribution and on the spot reactive-load compensation to itself idle to balance system are reasonably distinguished；Using conjunction
The metering method sectional of reason is measured and judged to the reactive energy at generation of electricity by new energy station, there is provided the nothing at generation of electricity by new energy station
The foundation of work(metering, can truly reflect the idle output at generation of electricity by new energy station, substantially increase generation of electricity by new energy station and actively close
The reactive-load compensation equipment that puts into operation of reason, optimizes allocation of resources, substantially increases the operation that the quality of power supply is advantageous to power network efficient stable.
Accurate measurement of the present invention, efficiently, can truly reflect the idle output at generation of electricity by new energy station, and can accurately measure new energy
Power station reactive power.
Brief description of the drawings
Fig. 1 is the flow chart of the reactive energy measurement method for generation of electricity by new energy station of the present invention.
Fig. 2 is the functional module of the metering device of the reactive energy measurement method for generation of electricity by new energy station of the present invention
Figure.
Embodiment
As shown in figure 1, the flow chart of the reactive energy measurement method for generation of electricity by new energy station for the present invention：The present invention
This reactive energy measurement method for generation of electricity by new energy station provided, comprises the following steps：
S1. when acquisition generation of electricity by new energy station generates electricity by way of merging two or more grid systems, scope range of the fluctuation of voltage and circuit when grid requirements generate electricity by way of merging two or more grid systems
Power attenuation scope；
S2. the scope range of the fluctuation of voltage and line power exhaustion range that step S1 in root is obtained, calculate meet voltage wave respectively
First power factor section of dynamic scope and the second power factor section for meeting line power exhaustion range：
Described calculating meets the first power factor section of scope range of the fluctuation of voltage, to be calculated using following formula：
WhereinFor power factor；IFor corresponding electric current, current potential A；XFor reactance；RFor impedance；UFor the line of transmission
Voltage, unit kV；εFor scope range of the fluctuation of voltage percentage；
Described the second power factor section for meeting line power exhaustion range, to be calculated at last using following：
WhereinFor power factor；PFor the active power of conveying, unit kW；RFor impedance；UFor the line electricity of transmission
Pressure, unit kV；ηFor power swing range percentage；
S3. the first power factor section and the second power factor section obtained according to step S2, acquisition weigh between the two
Folded region, calculates optimum power factor when circuit power attenuation is minimum in overlapping region；
S4. the capacity of idle power of generation of electricity by new energy station at work, and realtime power factor during writing task are measured；
S5. the optimum power factor obtained according to the realtime power factor that step S4 is obtained with step S3, counts real-time work(
It is idle when reactive power consumption electricity and realtime power factor when rate factor is less than optimum power factor are more than optimum power factor
Compensate electricity；
S6. calculate the difference between reactive power consumption electricity and reactive-load compensation electricity, and according to the size of difference and power because
Several sizes, charged or compensated according to national legislation：
Power factor is calculated at last using following：
WhereinFor power factor；PFor the active power of conveying, unit kW；QFor the reactive power for exchange,
Unit is kvar.
Charged or compensated according to national legislation, then specifically comprised the following steps：
1）If reactive power consumption electricity ratio reactive-load compensation electricity is big, according to power factor and national legislation《Power factor is adjusted
Whole electricity charge method》Specified in power factor size, carry out idle charge to power plant according to national legislation；
2）If reactive power consumption electricity ratio reactive-load compensation electricity is small, the regulation according to power plant's online contract is mended to power plant
Repay.
As shown in Fig. 2 the work(of the metering device for the reactive energy measurement method for generation of electricity by new energy station of the present invention
Can module map：The multifunctional electric energy meter, point power factor electric energy meter, data electricity that the device includes storing load curve are adopted
Storage and industrial computer；Power factor electric energy meter is divided to be used for capacity of idle power and work(when recording power factor is less than optimum power factor
Rate factor is more than capacity of idle power during optimum power factor；Multifunctional electric energy meter is used for the electric energy for measuring power station；Data electricity
Collector is used to gather the data of multifunctional electric energy meter and point power factor electric energy meter and uploads to industrial computer；Industrial computer uses institute
The reactive energy measurement method for generation of electricity by new energy station stated calculates the reactive energy in power station.
Claims (7)
1. a kind of reactive energy measurement method for generation of electricity by new energy station, comprise the following steps：
S1. when acquisition generation of electricity by new energy station generates electricity by way of merging two or more grid systems, scope range of the fluctuation of voltage and line power when grid requirements generate electricity by way of merging two or more grid systems
Exhaustion range；
S2. the scope range of the fluctuation of voltage and line power exhaustion range that step S1 in root is obtained, calculate meet voltage pulsation model respectively
The the first power factor section enclosed and the second power factor section for meeting line power exhaustion range；
S3. the first power factor section and the second power factor section obtained according to step S2, overlay region between the two is obtained
Domain, calculate optimum power factor when circuit power attenuation is minimum in overlapping region；
S4. the capacity of idle power of generation of electricity by new energy station at work, and realtime power factor during writing task are measured；
S5. the optimum power factor that realtime power factor and the step S3 obtained according to step S4 is obtained, statistics realtime power because
Reactive power consumption electricity and realtime power factor when number is less than optimum power factor are more than reactive-load compensation during optimum power factor
Electricity；
S6. the difference between reactive power consumption electricity and reactive-load compensation electricity is calculated, obtains the idle electricity of reality at generation of electricity by new energy station
Can, and according to the size of difference and the size of power factor, charged or compensated according to national legislation.
2. the reactive energy measurement method according to claim 1 for generation of electricity by new energy station, it is characterised in that step S2
Described calculating meets the first power factor section of scope range of the fluctuation of voltage, to be calculated using following formula：
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<mi>R</mi>
<mo>&PlusMinus;</mo>
<msqrt>
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<mi>I</mi>
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</msup>
<mo>+</mo>
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<mi>R</mi>
<mn>2</mn>
</msup>
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<mi>I</mi>
<mn>2</mn>
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<mn>2</mn>
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<mi>&epsiv;</mi>
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<mi>X</mi>
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</msqrt>
<mo>)</mo>
</mrow>
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Wherein cos φ are power factor；I is corresponding electric current, current potential A；X is reactance；R is impedance；U is the line electricity of transmission
Pressure, unit kV；ε is scope range of the fluctuation of voltage percentage.
3. the reactive energy measurement method according to claim 1 for generation of electricity by new energy station, it is characterised in that step S2
Described the second power factor section for meeting line power exhaustion range, to be calculated using following formula：
<mrow>
<mi>c</mi>
<mi>o</mi>
<mi>s</mi>
<mi>&phi;</mi>
<mo>=</mo>
<mo>&PlusMinus;</mo>
<msqrt>
<mfrac>
<mrow>
<mi>P</mi>
<mo>&times;</mo>
<mi>R</mi>
</mrow>
<mrow>
<msup>
<mi>U</mi>
<mn>2</mn>
</msup>
<mi>&eta;</mi>
</mrow>
</mfrac>
</msqrt>
</mrow>
Wherein cos φ are power factor；P be conveying active power, unit kW；R is impedance；U is the line voltage of transmission, single
Position is kV；η is power swing range percentage.
4. the reactive energy measurement method according to claim 1 for generation of electricity by new energy station, it is characterised in that step S6
Described power factor, to be calculated using following formula：
<mrow>
<mi>c</mi>
<mi>o</mi>
<mi>s</mi>
<mi>&phi;</mi>
<mo>=</mo>
<mfrac>
<mi>P</mi>
<msqrt>
<mrow>
<msup>
<mi>P</mi>
<mn>2</mn>
</msup>
<mo>+</mo>
<msup>
<mi>Q</mi>
<mn>2</mn>
</msup>
</mrow>
</msqrt>
</mfrac>
</mrow>
Wherein cos φ are power factor；P be conveying active power, unit kW；Q is reactive power for exchange, unit
For kvar.
5. the reactive energy measurement method according to claim 1 for generation of electricity by new energy station, it is characterised in that step S6
Described foundation national legislation is charged or compensated, and is specifically comprised the following steps：
If 1) reactive power consumption electricity ratio reactive-load compensation electricity is big, according to power factor and national legislation《Power factor adjustment electricity
Take method》Specified in power factor size, carry out idle charge to power plant according to national legislation；
If 2) reactive power consumption electricity ratio reactive-load compensation electricity is small, the regulation according to power plant's online contract compensates to power plant.
6. a kind of reactive energy measurement method for generation of electricity by new energy station of application according to one of Claims 1 to 5
Reactive energy measurement device, it is characterised in that multifunctional electric energy meter, data electric quantity collector including load curve can be stored
And industrial computer；Multifunctional electric energy meter is used for the electric energy for measuring power station；Data electric quantity collector is used to gather multifunctional electric energy meter
Data and upload to industrial computer；Industrial computer uses the described reactive energy measurement method for generation of electricity by new energy station to calculate hair
The reactive energy in power station.
7. the reactive energy measurement dress of the reactive energy measurement method according to claim 6 for generation of electricity by new energy station
Put, it is characterised in that described reactive energy measurement device, in addition to divide power factor electric energy meter, divide power factor electric energy meter to use
It is idle when capacity of idle power and power factor when recording power factor is less than optimum power factor are more than optimum power factor
Electricity.
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