CN105223395A - For the reactive energy measurement method at generation of electricity by new energy station - Google Patents
For the reactive energy measurement method at generation of electricity by new energy station Download PDFInfo
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- CN105223395A CN105223395A CN201510709263.4A CN201510709263A CN105223395A CN 105223395 A CN105223395 A CN 105223395A CN 201510709263 A CN201510709263 A CN 201510709263A CN 105223395 A CN105223395 A CN 105223395A
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Abstract
The invention provides a kind of reactive energy measurement method for generation of electricity by new energy station, comprise and obtain scope range of the fluctuation of voltage and line power exhaustion range; Calculate the power factor interval meeting scope range of the fluctuation of voltage and meet line power exhaustion range; The optimum power factor that in overlapping region, computational scheme power attenuation is minimum between; The capacity of idle power during work of metering power house and realtime power factor; The relatively relation of realtime power factor and optimum power factor, metering reactive power consumption electricity and reactive-load compensation electricity; Calculate the difference between reactive power consumption electricity and reactive-load compensation electricity, obtain the actual reactive energy at generation of electricity by new energy station.The present invention reasonably distinguishes power house to the idle contribution of balanced system and local reactive power compensation, the foundation of the reactive measurement at generation of electricity by new energy station is provided, measure the idle of power house accurately and efficiently to exert oneself, improve the enthusiasm that reactive-load compensation is carried out in power house, indirectly improve the quality of electrical network electric energy.
Description
Technical field
The invention belongs to electric energy metrical field, be specifically related to a kind of reactive energy measurement method for generation of electricity by new energy station.
Background technology
Along with national economy and scientific and technological development, people more and more start concern for the environment problem.Day by day serious due to the problem such as haze, environmental pollution, country is also increasing for the input of environmental improvement, environmental protection.Grid-connected power generation system is polluted with its near-zero, the characteristic of zero-emission, progressively receives accreditation and the favor of country.
But along with increasing new energy power generation grid-connection, the intermittence that generation of electricity by new energy has, randomness and impact bring huge challenge to the guarantee of the reliability service of network system and the quality of power supply.Therefore electrical network not only needs to pay close attention to the active energy being supplied to user, also the reactive energy quality of power supply being had to considerable influence to be paid close attention to: if System Reactive Power electric energy is superfluous, then easily cause overtension, not only cause electric energy loss, also increase the spoilage of electrical equipment; If but network system reactive energy is not enough, line voltage will be caused to decline; Cause electrical network load capacity not enough time serious, cause whole system to collapse, partial electric grid off-the-line.
At present, generation of electricity by new energy station generally has two kinds of mode of operations: pattern of generating electricity by way of merging two or more grid systems and grid-connected power mode.The existing reactive measurement method to generation of electricity by new energy station is compensated by new energy power generation grid-connection System Reactive Power and the local reactive power compensation of self all includes the consumption of grid-connected power generation system own reactive in; The method cannot utilize grid-connected power generation system its own advantages reasonably to regulate and control electrical network fully, this kind of Double-Direction User of new energy power generation grid-connection also cannot be encouraged to put into operation the enthusiasm of reactive-load compensation equipment, thus cannot realize System Reactive Power balance.
Summary of the invention
The object of the present invention is to provide a kind of truly can reflect generation of electricity by new energy station idlely to exert oneself, can the reactive energy measurement method for generation of electricity by new energy station of accurate-metering 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 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 when grid requirements generates electricity by way of merging two or more grid systems and line power exhaustion range;
S2. the scope range of the fluctuation of voltage that obtains of root step S1 and line power exhaustion range, calculates that the first power factor meeting scope range of the fluctuation of voltage is interval and to meet the second power factor of line power exhaustion range interval respectively;
S3. and second power factor interval interval according to the first power factor of step S2 acquisition, obtains overlapping region between the two, calculates optimum power factor when circuit power attenuation is minimum in overlapping region;
S4. generation of electricity by new energy station capacity of idle power is operationally measured, and realtime power factor during writing task;
S5. the optimum power factor that the realtime power factor and the step S3 that obtain according to step S4 obtain, adds up reactive-load compensation electricity when reactive power consumption electricity when realtime power factor is less than optimum power factor and realtime power factor are greater than optimum power factor;
S6. calculate the difference between reactive power consumption electricity and reactive-load compensation electricity, obtain the actual reactive energy at generation of electricity by new energy station.
The first power factor that calculating described in step S2 meets scope range of the fluctuation of voltage is interval, calculates for adopting following formula:
Wherein
for power factor;
ifor corresponding electric current, current potential is A;
xfor reactance;
rfor impedance;
ufor the line voltage of transmission, unit is kV;
εfor scope range of the fluctuation of voltage number percent;
The second power factor meeting line power exhaustion range described in step S2 is interval, to calculate at last below for adopting:
Wherein
for power factor;
pfor the active power of conveying, unit is kW;
rfor impedance;
ufor the line voltage of transmission, unit is kV;
ηfor power swing range percentage;
Power factor described in step S6, to calculate at last below for adopting:
Wherein
for power factor;
pfor the active power of conveying, unit is kW;
qfor the reactive power for exchanging, unit is kvar.
Foundation national legislation described in step S6 carries out charging or compensating, and specifically comprises the steps:
1) if reactive power consumption electricity ratio reactive-load compensation electricity is large, then according to the size of the power factor specified in power factor and national legislation " power factor adjustment charge way ", idle charge is carried out according to national legislation to power plant;
2) if reactive power consumption electricity ratio reactive-load compensation electricity is little, then the regulation according to power plant's online contract compensates to power plant.
Apply a reactive energy measurement device for the described reactive energy measurement method for generation of electricity by new energy station, comprise multifunctional electric energy meter, data electric quantity collector and the industrial computer that can store load curve; Multifunctional electric energy meter is for measuring the electric energy of power house; Data electric quantity collector is for gathering the data of multifunctional electric energy meter and uploading to industrial computer; The reactive energy measurement method for generation of electricity by new energy station described in industrial computer adopts calculates the reactive energy of power house.
Described reactive energy measurement device, also comprises a point power factor electric energy meter, and point power factor electric energy meter is used for capacity of idle power when capacity of idle power when recording power factor is less than optimum power factor and power factor are greater than optimum power factor.
The present invention, by calculating theoretical best power factor, and according to optimum power factor by stages record capacity of idle power, has reasonably distinguished generation of electricity by new energy station to the idle contribution of balanced system with on the spot to the reactive-load compensation of self; The reactive energy of rational metering method sectional to generation of electricity by new energy station is adopted to measure and judge, the foundation of the reactive measurement at generation of electricity by new energy station is provided, truly can reflect that the idle of generation of electricity by new energy station is exerted oneself, substantially increase generation of electricity by new energy station actively reasonably put into operation reactive-load compensation equipment, optimize allocation of resources, substantially increase the operation that the quality of power supply is conducive to electrical network efficient stable.Accurate measurement of the present invention, efficient, truly can reflect that the idle of generation of electricity by new energy station is exerted oneself, and can accurate-metering generation of electricity by new energy station reactive power.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the reactive energy measurement method for generation of electricity by new energy station of the present invention.
Fig. 2 is the functional block diagram of the measuring apparatus of the reactive energy measurement method for generation of electricity by new energy station of the present invention.
Embodiment
As shown in Figure 1, the process flow diagram for the reactive energy measurement method for generation of electricity by new energy station of the present invention: this reactive energy measurement method for generation of electricity by new energy station provided by the invention, comprises the 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 when grid requirements generates electricity by way of merging two or more grid systems and line power exhaustion range;
S2. the scope range of the fluctuation of voltage that obtains of root step S1 and line power exhaustion range, calculates that the first power factor meeting scope range of the fluctuation of voltage is interval and to meet the second power factor of line power exhaustion range interval respectively:
The first power factor that described calculating meets scope range of the fluctuation of voltage is interval, calculates for adopting following formula:
Wherein
for power factor;
ifor corresponding electric current, current potential is A;
xfor reactance;
rfor impedance;
ufor the line voltage of transmission, unit is kV;
εfor scope range of the fluctuation of voltage number percent;
Described the second power factor meeting line power exhaustion range is interval, to calculate at last below for adopting:
Wherein
for power factor;
pfor the active power of conveying, unit is kW;
rfor impedance;
ufor the line voltage of transmission, unit is kV;
ηfor power swing range percentage;
S3. and second power factor interval interval according to the first power factor of step S2 acquisition, obtains overlapping region between the two, calculates optimum power factor when circuit power attenuation is minimum in overlapping region;
S4. generation of electricity by new energy station capacity of idle power is operationally measured, and realtime power factor during writing task;
S5. the optimum power factor that the realtime power factor and the step S3 that obtain according to step S4 obtain, adds up reactive-load compensation electricity when reactive power consumption electricity when realtime power factor is less than optimum power factor and realtime power factor are greater than optimum power factor;
S6. calculate the difference between reactive power consumption electricity and reactive-load compensation electricity, and according to the size of difference and the size of power factor, carry out charging or compensating according to national legislation:
Power factor calculates below adopting at last:
Wherein
for power factor;
pfor the active power of conveying, unit is kW;
qfor the reactive power for exchanging, unit is kvar.
Carry out charging or compensating according to national legislation, then specifically comprise the steps:
1) if reactive power consumption electricity ratio reactive-load compensation electricity is large, then according to the size of the power factor specified in power factor and national legislation " power factor adjustment charge way ", idle charge is carried out according to national legislation to power plant;
2) if reactive power consumption electricity ratio reactive-load compensation electricity is little, then the regulation according to power plant's online contract compensates to power plant.
As shown in Figure 2, be the functional block diagram of the measuring apparatus of the reactive energy measurement method for generation of electricity by new energy station of the present invention: this device comprises multifunctional electric energy meter, point power factor electric energy meter, data electric quantity collector and the industrial computer that can store load curve; Point power factor electric energy meter is used for capacity of idle power when capacity of idle power when recording power factor is less than optimum power factor and power factor are greater than optimum power factor; Multifunctional electric energy meter is for measuring the electric energy of power house; Data electric quantity collector is for gathering the data of multifunctional electric energy meter and point power factor electric energy meter and uploading to industrial computer; The reactive energy measurement method for generation of electricity by new energy station described in industrial computer adopts calculates the reactive energy of power house.
Claims (7)
1., for the reactive energy measurement method at generation of electricity by new energy station, comprise the 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 when grid requirements generates electricity by way of merging two or more grid systems and line power exhaustion range;
S2. the scope range of the fluctuation of voltage that obtains of root step S1 and line power exhaustion range, calculates that the first power factor meeting scope range of the fluctuation of voltage is interval and to meet the second power factor of line power exhaustion range interval respectively;
S3. and second power factor interval interval according to the first power factor of step S2 acquisition, obtains overlapping region between the two, calculates optimum power factor when circuit power attenuation is minimum in overlapping region;
S4. generation of electricity by new energy station capacity of idle power is operationally measured, and realtime power factor during writing task;
S5. the optimum power factor that the realtime power factor and the step S3 that obtain according to step S4 obtain, adds up reactive-load compensation electricity when reactive power consumption electricity when realtime power factor is less than optimum power factor and realtime power factor are greater than optimum power factor;
S6. calculate the difference between reactive power consumption electricity and reactive-load compensation electricity, obtain the actual reactive energy at generation of electricity by new energy station.
2. the reactive energy measurement method for generation of electricity by new energy station according to claim 1, is characterized in that the calculating described in step S2 meets the first power factor interval of scope range of the fluctuation of voltage, calculating for adopting following formula:
Wherein
for power factor;
ifor corresponding electric current, current potential is A;
xfor reactance;
rfor impedance;
ufor the line voltage of transmission, unit is kV;
εfor scope range of the fluctuation of voltage number percent.
3. the reactive energy measurement method for generation of electricity by new energy station according to claim 1, is characterized in that the second power factor meeting line power exhaustion range described in step S2 is interval, to calculate at last below for adopting:
Wherein
for power factor;
pfor the active power of conveying, unit is kW;
rfor impedance;
ufor the line voltage of transmission, unit is kV;
ηfor power swing range percentage.
4. the reactive energy measurement method for generation of electricity by new energy station according to claim 1, is characterized in that the power factor described in step S6, to calculate at last below for adopting:
Wherein
for power factor;
pfor the active power of conveying, unit is kW;
qfor the reactive power for exchanging, unit is kvar.
5. the reactive energy measurement method for generation of electricity by new energy station according to claim 1, is characterized in that the foundation national legislation described in step S6 carries out charging or compensating, specifically comprises the steps:
1) if reactive power consumption electricity ratio reactive-load compensation electricity is large, then according to the size of the power factor specified in power factor and national legislation " power factor adjustment charge way ", idle charge is carried out according to national legislation to power plant;
2) if reactive power consumption electricity ratio reactive-load compensation electricity is little, then the regulation according to power plant's online contract compensates to power plant.
6. application is according to a reactive energy measurement device for the reactive energy measurement method for generation of electricity by new energy station one of claim 1 ~ 5 Suo Shu, it is characterized in that comprising multifunctional electric energy meter, data electric quantity collector and the industrial computer that can store load curve; Multifunctional electric energy meter is for measuring the electric energy of power house; Data electric quantity collector is for gathering the data of multifunctional electric energy meter and uploading to industrial computer; The reactive energy measurement method for generation of electricity by new energy station described in industrial computer adopts calculates the reactive energy of power house.
7. the reactive energy measurement method for generation of electricity by new energy station according to claim 6, it is characterized in that described reactive energy measurement device, also comprise a point power factor electric energy meter, point power factor electric energy meter is used for capacity of idle power when capacity of idle power when recording power factor is less than optimum power factor and power factor are greater than optimum power factor.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116629641A (en) * | 2023-07-21 | 2023-08-22 | 沈阳嘉越电力数字化产业技术研究院有限公司 | New energy station grid-connected stability assessment method |
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