CN105896615B - A kind of power station reactive power distribution method based on voltage sensibility - Google Patents

A kind of power station reactive power distribution method based on voltage sensibility Download PDF

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Publication number
CN105896615B
CN105896615B CN201610233100.8A CN201610233100A CN105896615B CN 105896615 B CN105896615 B CN 105896615B CN 201610233100 A CN201610233100 A CN 201610233100A CN 105896615 B CN105896615 B CN 105896615B
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reactive power
voltage
reactive
power
sensitivity
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CN105896615A (en
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张阁
肖静
杨艺云
肖园园
司传涛
梁朔
周杨珺
郭敏
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Electric Power Research Institute of Guangxi Power Grid Co Ltd
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Electric Power Research Institute of Guangxi Power Grid Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/48—Controlling the sharing of the in-phase component
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

The invention discloses a kind of power station reactive power distribution method based on voltage sensibility, it is related to power station Technique of Compensating Capacitance for Reactive field, distribution method is scientific and reasonable, it is ensured that the reactive power compensation of reduction to normal value, validity is high；Greatly reduce the degree of unbalancedness of grid entry point voltage, the powerful guarantee safe operation in power station.Drip irrigation device is：Measure the real-time output voltage of grid entry point；Judge whether Voltage Drop occur；When there is Voltage Drop, calculate real-time voltage and fall value；Adjust the reactive power total amount for needing to compensate；Calculate the sensitivity of reactive power that each generator unit and reactive power compensation device are sent to grid entry point voltage；The ratio for accounting for total sensitivity using sensitivity of the reactive power that each generator unit and reactive power compensator are sent to grid entry point voltage carries out the distribution of reactive power total amount as distribution weight.Present invention is mainly used in reactive power compensation.

Description

A kind of power station reactive power distribution method based on voltage sensibility
Technical field
The present invention relates to power station Technique of Compensating Capacitance for Reactive field, more particularly to a kind of generating based on voltage sensibility Reactive power of standing distribution method.
Background technology
In recent years, photovoltaic generation industry in China's develops rapidly, and the cut-off whole nation of in September, 2015 Photovoltaic generation installed capacity reaches 37950000 kilowatts, the issue of the end of the year of State Council 2014《Energy development strategy action plan》It is proposed：It is total to the year two thousand twenty, photovoltaic generation Installed capacity is up to 100,000,000 kilowatts or so, therefore is directed to photovoltaic power generation technology research, and it is current be somebody's turn to do to promote theCourse of PV Industry The most important thing of art person works.
When running into bad weather（Such as thunderbolt, storm）, Voltage Drop failure can occur for photovoltaic power network.Voltage Drop (sags/dips) refer to that at a time voltage magnitude deviates normal range of operation suddenly, this will make power network output abnormality, nothing Work(power reduces.Solve Voltage Drop failure, i.e. compensating power in the prior art, be on the one hand each by power station itself Generator unit sends reactive power and compensated, and is on the other hand compensated by external reactive power compensator.
Above by the method for each generator unit and the common compensating power of reactive power compensation device, either each hair Electric unit, or reactive power compensation device all simply compensate according to itself reactive power amount of sending unstable in real time, However, because most of Voltage Drop values are unstable and irregular, accordingly, the reactive power amount that need to be compensated every time is not It is stable and irregular, if all simply according to itself when each generator unit and each Voltage Drop failure of reactive power compensation device The reactive power amount of sending unstable in real time compensates, and does not ensure that the reactive power compensation of reduction to normal value；And And Voltage Drop failure can cause a part of or even whole generator unit off-grids, increase grid entry point voltage unbalance factor, seriously Influence the operation of photo-voltaic power generation station；A part of or even whole generator unit off-grids, also make the validity of reactive power compensation more It is difficult to ensure that.
The content of the invention
A kind of power station reactive power distribution method based on voltage sensibility provided by the invention, by calculating each generating Sensitivity of the reactive power that unit and reactive power compensation device are sent to grid entry point voltage, total spirit is accounted for according to respective sensitivity The ratio of sensitivity is distribution weight, carries out the distribution of reactive power amount to be compensated, distribution method is scientific and reasonable, it is ensured that by reduction Reactive power compensation is high to normal value, validity；Greatly reduce the degree of unbalancedness of grid entry point voltage, powerful guarantee power station Safe operation.
To reach above-mentioned purpose, embodiments of the invention adopt the following technical scheme that：
The present invention provides a kind of power station reactive power distribution method based on voltage sensibility, including：
Measure the real-time output voltage Ua of grid entry point；The grid entry point is that a plurality of current collection circuit output merges section in power station Point.
Judge whether the power station Voltage Drop occurs according to the output voltage Ua and reference voltage Ub in real time：If Ua Not less than Ub, then the power station output is normal, does not occur Voltage Drop；If Ua is less than Ub, there is voltage in the power station Fall, it is necessary to compensating power.
When Voltage Drop occurs in the power station, calculate real-time voltage and fall value Uc, Uc=Ub-Ua.
Adjust out when the real-time voltage falls the reactive power total amount Q that the power station needs compensate when value is Uc.
The power station includes collection electric line L1, L2, L3 ... Li, and the j list that generates electricity is equipped with every collection electric line First P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij, accordingly, each generating The reactance of unit is X11, X12 ... X1j, X21, X22 ... X2j, X31, X32 ... X3j ... Xi1, Xi2 ... Xij；According to formula： Xhk=, calculate the reactance of each generator unit；Wherein, Xhk is k-th of generator unit in the h articles collection electric line Reactance, 1≤h≤i, 1≤k≤j.
Obtain voltage U1, U2, U3 ... the Ui of collection electric line L1, L2, L3 ... the Li；According to formula：Shk=Xhk ÷ Uh, Calculate generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... the P3j ... Pi1, Pi2 ... Pij are sent Sensitivity of the reactive power to the grid entry point voltage；Wherein, Shk is that k-th of generator unit is sent in the h articles collection electric line Sensitivity of the reactive power to the grid entry point voltage, 1≤h≤i, 1≤k≤j.
Obtain reactive power compensator and access the power station voltage USVG, according to formula：SSVG=XSVG÷USVG, described in calculating Sensitivity of the reactive power that reactive power compensator is sent to the grid entry point voltage；Wherein, SSVGFor the reactive power compensator Sensitivity of the reactive power sent to the grid entry point voltage, XSVGFor the reactance of the reactive power compensator.
With each generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... The ratio that sensitivity of the reactive power that Pij and the reactive power compensator are sent to the grid entry point voltage accounts for total sensitivity is Weight is distributed, carries out the reactive power total amount Q distribution：According to formula：Qhk=, with each Generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... the P3j ... Pi1, Pi2 ... Pij send idle Sensitivity of the power to the grid entry point voltage accounts for the ratio of total sensitivity as distribution weight, to each generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij carry out reactive power distribution；According to formula： QSVG=, with the reactive power that the reactive power compensator is sent to the grid entry point voltage Sensitivity account for the ratio of total sensitivity as distribution weight, reactive power distribution is carried out to the reactive power compensator.
With reference to above-mentioned, the power station reactive power distribution method based on voltage sensibility, in addition to：
Obtain each generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij and the reactive power compensator nominal reactive capacity, each generator unit P11, P12 ... P1j is judged respectively, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij and the reactive power compensator are allocated reactive power amount Whether its nominal reactive capacity is exceeded.
If each generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij and the reactive power compensator are allocated reactive power amount without departing from its nominal reactive capacity, then each generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij and the reactive power compensator according to Allocated reactive power amount sends reactive power and compensated；If any one or more generator units or the idle benefit Repay the allocated reactive power amount of device and exceed its nominal reactive capacity, then any one or more generator units or described Reactive power compensator sends reactive power according to its nominal reactive capacity and compensated.
With reference to above-mentioned, the power station reactive power distribution method based on voltage sensibility, in addition to：
Exceed it when any one or more generator units or the reactive power compensator are allocated reactive power amount Nominal reactive capacity, any one or more generator units or the reactive power compensator are according to its nominal reactive capacity When sending reactive power, calculate reactive power power back-off and owe value, corresponding newly-increased reactive power compensation device.
With reference to above-mentioned, further, including：The power station is photo-voltaic power generation station.
A kind of power station reactive power distribution method based on voltage sensibility provided by the invention, including：Measure grid-connected The real-time output voltage of point；Judge whether Voltage Drop occur；When there is Voltage Drop, calculate real-time voltage and fall value；Adjust Go out to need the reactive power total amount compensated；Reactive power that each generator unit and reactive power compensation device are sent is calculated to grid-connected The sensitivity of point voltage；Accounted for sensitivity of the reactive power that each generator unit and reactive power compensator are sent to grid entry point voltage The ratio of total sensitivity is distribution weight, carries out the distribution of reactive power total amount, compared to prior art, distribution method of the present invention It is scientific and reasonable, it is ensured that the reactive power compensation of reduction to normal value, validity is high；Greatly reduce the injustice of grid entry point voltage Weighing apparatus degree, the powerful guarantee safe operation in power station.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment Accompanying drawing be briefly described.
Fig. 1 is that a kind of power station reactive power distribution method flow based on voltage sensibility is shown in the embodiment of the present invention 1 It is intended to；
Fig. 2 is that a kind of power station reactive power distribution method flow based on voltage sensibility is shown in the embodiment of the present invention 2 It is intended to.
Embodiment
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 carried out clear, complete Site preparation describes.Obviously, described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made Embodiment, belong to the scope of protection of the invention.
Embodiment 1
The embodiment of the present invention provides a kind of power station reactive power distribution method based on voltage sensibility, as shown in figure 1, Including：
101st, the real-time output voltage Ua of grid entry point is measured；The grid entry point is that a plurality of current collection circuit output merges in power station Node.
Wherein, the present embodiment power station is photo-voltaic power generation station, and photo-voltaic power generation station is to rely on solar cell module, utilizes half The electronics property of conductor material, luminous energy is changed into electric energy.
Photo-voltaic power generation station can be divided into off-network photo-voltaic power generation station and grid-connected photovoltaic power generation station, wherein grid-connected photovoltaic power generation station ratio Off-network photo-voltaic power generation station investment low 25%, is supported each other with bulk power grid, improves photovoltaic generation scale.The present embodiment photo-voltaic power generation station For grid-connected photovoltaic power generation station, by the DC signal of each bar current collection circuit output by it is grid-connected, be converted into meeting utility grid will The alternating current asked, is directly accessed public electric wire net.
102nd, judge whether the power station Voltage Drop occurs according to the output voltage Ua and reference voltage Ub in real time.
If the 1021, Ua is not less than Ub, the power station output is normal, does not occur Voltage Drop.
If the 1022, Ua is less than Ub, there is Voltage Drop, needs compensating power in the power station.
Wherein, the reactive power of power network output does not consume electric energy, simply converts electrical energy into another form of energy, such as electricity Magnetic cell establishes magnetic field or capacitor establishes electric energy shared by electric field.Reference voltage Ub is power station rated output voltage, works as reality When output voltage Ua when being less than rated output voltage Ub, then there is Voltage Drop in power station, and the reactive power of power network output reduces, In order to ensure the normal work such as electromagnetic component or capacitor in network system, reactive power compensation need to be carried out.
103rd, when Voltage Drop occurs in the power station, calculate real-time voltage and fall value Uc, Uc=Ub-Ua.
104th, adjust out when the real-time voltage falls the reactive power total amount that the power station needs compensate when value is Uc Q。
Wherein, general adoption rate integral derivative controller is adjusted, and it is that the deviation of regulated variable and rated value is entered Row ratio, the analog regulator for integrating and differentiating.
105th, the power station includes collection electric line L1, L2, L3 ... Li, and j hair is equipped with every collection electric line Electric unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij, it is accordingly, each described The reactance of generator unit is X11, X12 ... X1j, X21, X22 ... X2j, X31, X32 ... X3j ... Xi1, Xi2 ... Xij；According to public affairs Formula：Xhk=, calculate the reactance of each generator unit；Wherein, Xhk is k-th of list that generates electricity in the h articles collection electric line The reactance of member, 1≤h≤i, 1≤k≤j.
106th, voltage U1, U2, U3 ... the Ui of collection electric line L1, L2, L3 ... the Li is obtained；According to formula：Shk=Xhk ÷ Uh, calculate generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... the P3j ... Pi1, Pi2 ... Pij Sensitivity of the reactive power sent to the grid entry point voltage；Wherein, Shk is k-th of generator unit in the h articles collection electric line Sensitivity of the reactive power sent to the grid entry point voltage, 1≤h≤i, 1≤k≤j.
107th, obtain reactive power compensator and access the power station voltage USVG, according to formula：SSVG=XSVG÷USVG, calculate Sensitivity of the reactive power that the reactive power compensator is sent to the grid entry point voltage；Wherein, SSVGFor the reactive-load compensation Sensitivity of the reactive power that device is sent to the grid entry point voltage, XSVGFor the reactance of the reactive power compensator.
108th, with each generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Sensitivity of the reactive power that Pi2 ... Pij and the reactive power compensator are sent to the grid entry point voltage accounts for total sensitivity Ratio is distribution weight, carries out the reactive power total amount Q distribution.
1081st, according to formula：Qhk=, with each described generator unit P11, P12 ... The reactive power that P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij are sent is to the grid entry point voltage Sensitivity account for the ratio of total sensitivity as distribution weight, to each generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij carry out reactive power distribution.
1082nd, according to formula：QSVG=, the nothing that is sent with the reactive power compensator The ratio that sensitivity of the work(power to the grid entry point voltage accounts for total sensitivity is distribution weight, and the reactive power compensator is entered Row reactive power is distributed.
A kind of power station reactive power distribution method based on voltage sensibility provided in an embodiment of the present invention, including：Survey Measure the real-time output voltage of grid entry point；Judge whether Voltage Drop occur；When there is Voltage Drop, calculate real-time voltage and fall Value；Adjust the reactive power total amount for needing to compensate；Calculate the reactive power that each generator unit and reactive power compensation device are sent Sensitivity to grid entry point voltage；With spirit of the reactive power that each generator unit and reactive power compensator are sent to grid entry point voltage The ratio that sensitivity accounts for total sensitivity is distribution weight, the distribution of reactive power total amount is carried out, compared to prior art, the present invention point Method of completing the square is scientific and reasonable, it is ensured that the reactive power compensation of reduction to normal value, validity is high；Greatly reduce grid entry point voltage Degree of unbalancedness, the powerful guarantee safe operation in power station.
Embodiment 2
The embodiment of the present invention provides a kind of power station reactive power distribution method based on voltage sensibility, as shown in Fig. 2 Including：
201st, the real-time output voltage Ua of grid entry point is measured；The grid entry point is that a plurality of current collection circuit output merges in power station Node.
202nd, judge whether the power station Voltage Drop occurs according to the output voltage Ua and reference voltage Ub in real time.
If the 2021, Ua is not less than Ub, the power station output is normal, does not occur Voltage Drop.
If the 2022, Ua is less than Ub, there is Voltage Drop, needs compensating power in the power station.
203rd, when Voltage Drop occurs in the power station, calculate real-time voltage and fall value Uc, Uc=Ub-Ua.
204th, adoption rate integral derivative controller is adjusted out when the real-time voltage falls power station when value is Uc Need the reactive power total amount Q compensated.
205th, the power station includes collection electric line L1, L2, L3 ... Li, and j hair is equipped with every collection electric line Electric unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij, it is accordingly, each described The reactance of generator unit is X11, X12 ... X1j, X21, X22 ... X2j, X31, X32 ... X3j ... Xi1, Xi2 ... Xij；According to public affairs Formula：Xhk=, calculate the reactance of each generator unit；Wherein, Xhk is k-th of list that generates electricity in the h articles collection electric line The reactance of member, 1≤h≤i, 1≤k≤j.
206th, voltage U1, U2, U3 ... the Ui of collection electric line L1, L2, L3 ... the Li is obtained；According to formula：Shk=Xhk ÷ Uh, calculate generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... the P3j ... Pi1, Pi2 ... Pij Sensitivity of the reactive power sent to the grid entry point voltage；Wherein, Shk is k-th of generator unit in the h articles collection electric line Sensitivity of the reactive power sent to the grid entry point voltage, 1≤h≤i, 1≤k≤j.
207th, obtain reactive power compensator and access the power station voltage USVG, according to formula：SSVG=XSVG÷USVG, calculate Sensitivity of the reactive power that the reactive power compensator is sent to the grid entry point voltage；Wherein, SSVGFor the reactive-load compensation Sensitivity of the reactive power that device is sent to the grid entry point voltage, XSVGFor the reactance of the reactive power compensator.
208th, with each generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Sensitivity of the reactive power that Pi2 ... Pij and the reactive power compensator are sent to the grid entry point voltage accounts for total sensitivity Ratio is distribution weight, carries out the reactive power total amount Q distribution.
2081st, according to formula：Qhk=, with each described generator unit P11, P12 ... The reactive power that P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij are sent is to the grid entry point voltage Sensitivity account for the ratio of total sensitivity as distribution weight, to each generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij carry out reactive power distribution.
2082nd, according to formula：QSVG=, the nothing that is sent with the reactive power compensator The ratio that sensitivity of the work(power to the grid entry point voltage accounts for total sensitivity is distribution weight, and the reactive power compensator is entered Row reactive power is distributed.
209th, obtain each generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij and the reactive power compensator nominal reactive capacity, each generator unit P11, P12 ... P1j is judged respectively, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij and the reactive power compensator are allocated reactive power amount Whether its nominal reactive capacity is exceeded.
If the 2091st, each generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij and the reactive power compensator are allocated reactive power amount without departing from its nominal reactive capacity, then each generating Unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij and the reactive power compensator Reactive power is sent according to allocated reactive power amount to compensate.
The 2092nd, if any one or more generator units or the reactive power compensator are allocated reactive power amount and surpassed Go out its nominal reactive capacity, then any one or more generator units or the reactive power compensator are according to its specified nothing Power capacity amount sends reactive power and compensated.
210th, surpass when any one or more generator units or the reactive power compensator are allocated reactive power amount Go out its nominal reactive capacity, any one or more generator units or the reactive power compensator are according to its nominal reactive When capacity sends reactive power, calculate reactive power power back-off and owe value, corresponding newly-increased reactive power compensation device.
Wherein, the reactive power value that newly-increased reactive power compensation device is sent is equal with the deficient value of reactive power power back-off, It so can ensure that the reactive power compensation that will fall to normal value.
A kind of power station reactive power distribution method based on voltage sensibility provided in an embodiment of the present invention, including:Survey Measure the real-time output voltage of grid entry point；Judge whether Voltage Drop occur；When there is Voltage Drop, calculate real-time voltage and fall Value；Adjust the reactive power total amount for needing to compensate；Calculate the reactive power that each generator unit and reactive power compensation device are sent Sensitivity to grid entry point voltage；With spirit of the reactive power that each generator unit and reactive power compensator are sent to grid entry point voltage The ratio that sensitivity accounts for total sensitivity is distribution weight, the distribution of reactive power total amount is carried out, compared to prior art, the present invention point Method of completing the square is scientific and reasonable, it is ensured that the reactive power compensation of reduction to normal value, validity is high；Greatly reduce grid entry point voltage Degree of unbalancedness, the powerful guarantee safe operation in power station.
Further, the reactive power allocated by judging each generator unit and reactive power compensator of the embodiment of the present invention Whether amount exceeds its nominal reactive capacity, beyond when according to its specified reactive capability send reactive power, make each generator unit Worked with reactive power compensation device in rated load, reduce each equipment loss, extend each equipment life；And calculate reality When reactive power compensation owe value, corresponding newly-increased reactive power compensation device, ensure reactive power compensation to normal value, further Improve effectiveness of the invention.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any Those familiar with the art the invention discloses technical scope in, the change or replacement that can readily occur in, all should It is included within the scope of the present invention.Therefore, protection scope of the present invention should using the scope of the claims as It is accurate.

Claims (4)

  1. A kind of 1. power station reactive power distribution method based on voltage sensibility, it is characterised in that including：
    Measure the real-time output voltage Ua of grid entry point；The grid entry point is a plurality of current collection circuit output merge node in power station；
    Judge whether the power station Voltage Drop occurs according to the output voltage Ua and reference voltage Ub in real time：If Ua is not small In Ub, then the power station output is normal, does not occur Voltage Drop；If Ua is less than Ub, there is Voltage Drop in the power station, Need compensating power；
    When Voltage Drop occurs in the power station, calculate real-time voltage and fall value Uc, Uc=Ub-Ua；
    Adjust out when the real-time voltage falls the reactive power total amount Q that the power station needs compensate when value is Uc；
    The power station includes collection electric line L1, L2, L3 ... Li, and j generator unit is equipped with every collection electric line P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij, corresponding, each list that generates electricity The reactance of member is X11, X12 ... X1j, X21, X22 ... X2j, X31, X32 ... X3j ... Xi1, Xi2 ... Xij；According to formula：Xhk =, calculate the reactance of each generator unit；Wherein, Xhk is the electricity of k-th of generator unit in the h articles collection electric line It is anti-, 1≤h≤i, 1≤k≤j；
    Obtain voltage U1, U2, U3 ... the Ui of collection electric line L1, L2, L3 ... the Li；According to formula：Shk=Xhk ÷ Uh, calculate Generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... the P3j ... Pi1, Pi2 ... Pij send idle Sensitivity of the power to grid entry point voltage；Wherein, Shk is the reactive power that k-th of generator unit is sent in the h articles collection electric line Sensitivity to the grid entry point voltage, 1≤h≤i, 1≤k≤j；
    Obtain reactive power compensator access power station voltage USVG, according to formula：SSVG=XSVG÷USVG, calculate the reactive-load compensation Sensitivity of the reactive power that device is sent to the grid entry point voltage；Wherein, SSVGThe nothing sent for the reactive power compensator Sensitivity of the work(power to the grid entry point voltage, XSVGFor the reactance of the reactive power compensator；
    With each generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij and The ratio that sensitivity of the reactive power that the reactive power compensator is sent to the grid entry point voltage accounts for total sensitivity is distribution Weight, carry out the reactive power total amount Q distribution：According to formula：Qhk=, with each described The reactive power that generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij are sent The ratio that sensitivity to the grid entry point voltage accounts for total sensitivity is distribution weight, to each described generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij carry out reactive power distribution；According to formula：QSVG=, with spirit of the reactive power that the reactive power compensator is sent to the grid entry point voltage The ratio that sensitivity accounts for total sensitivity is distribution weight, and reactive power distribution is carried out to the reactive power compensator.
  2. 2. the power station reactive power distribution method according to claim 1 based on voltage sensibility, it is characterised in that also Including：
    Obtain each generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij With the nominal reactive capacity of the reactive power compensator, each generator unit P11, P12 ... the P1j, P21, P22 ... are judged respectively P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij and the reactive power compensator are allocated whether reactive power amount exceeds it The nominal reactive capacity；
    If each generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij and Reactive power amount is allocated described in the reactive power compensator without departing from nominal reactive capacity its described, then each generating is single First P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij and the reactive power compensator are pressed Reactive power is sent according to the allocated reactive power amount to compensate；If any one or more generator units or described Reactive power amount is allocated described in reactive power compensator and exceeds its described nominal reactive capacity, then this is any one or more described Generator unit or the reactive power compensator send reactive power according to nominal reactive capacity its described and compensated.
  3. 3. the power station reactive power distribution method according to claim 2 based on voltage sensibility, it is characterised in that also Including：
    Exceed it when being allocated reactive power amount described in any one or more generator units or the reactive power compensator The nominal reactive capacity, any one or more generator units or the reactive power compensator are according to specified its described When reactive capability sends reactive power, calculate reactive power power back-off and owe value, corresponding newly-increased reactive power compensation device.
  4. 4. the power station reactive power distribution method according to claim 1 based on voltage sensibility, it is characterised in that bag Include：
    The power station is photo-voltaic power generation station.
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