CN105703373A - Voltage sensitivity-based reactive power distribution system for power station - Google Patents
Voltage sensitivity-based reactive power distribution system for power station Download PDFInfo
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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
- H02J3/12—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
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- 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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Abstract
The invention discloses a voltage sensitivity-based reactive power distribution system for a power station, and relates to the technical field of reactive power compensation of the power station. The distribution method is flexible, scientific and high in validity, and reasonably compensates the reduced reactive power to a normal value; the voltage unbalance of a grid connection point is greatly lowered; and safe operation of a photovoltaic power station is powerfully ensured. According to the scheme, a collection device transmits collected real-time output voltage to a first judgment device, so that the first judgment device carries out judgment according to a reference voltage; when the voltage drops, a setting device sets a to-be-compensated total reactive power corresponding to a real-time voltage drop value; a distribution controller carries out distribution of the total reactive power by calculating the sensitivities of power generation units and a reactive power compensation device to the voltage of the grid connection point according to the ratios of respective sensitivities in the total sensitivity as assignment weights. The voltage sensitivity-based reactive power distribution system for the power station is mainly applied to reactive power compensation of the power station.
Description
Technical field
The present invention relates to Technique of Compensating Capacitance for Reactive field, electric station, particularly relate to a kind of electric station reactive power distribution system based on voltage sensibility。
Background technology
In recent years, China's photovoltaic generation industry develops rapidly, end in JIUYUE, 2015 whole nation photovoltaic generation installed capacity and reach 37,950,000 kilowatts, " energy development Strategic Action Plan " that State Council 2014 will issue the end of the year proposes: to the year two thousand twenty, photovoltaic generation total installation of generating capacity is up to about 100,000,000 kilowatts, therefore being devoted to photovoltaic power generation technology research, promoting theCourse of PV Industry is the most important thing that these those skilled in the art current work。
When running into vile weather (such as thunderbolt, storm), can there is Voltage Drop fault in photovoltaic electrical network。Voltage Drop (sags/dips) refers to that at a time voltage magnitude deviates suddenly normal range of operation, and this will make electrical network output abnormality, and reactive power reduces。Existing electric station reactive power distribution system solves Voltage Drop, compensating power, is send reactive power by each generator unit in electric station self to compensate on the one hand, is compensated by external reactive power compensator on the other hand。
No matter above-mentioned electric station reactive power distribution system is each generator unit in electric station self, or reactive power compensation device is all compensate according to self reactive power amount of sending unstable in real time, but, owing to most of Voltage Drop values are unstable and irregular, accordingly, the reactive power amount that every time need to compensate is unstable and irregular, if being all compensate according to self real-time unstable reactive power amount of sending when each generator unit and each Voltage Drop fault of reactive power compensation device, do not ensure that the reactive power compensation of reduction to normal value；And, Voltage Drop fault can cause a part even all generator unit off-grids, makes grid-connected point voltage degree of unbalancedness increase, has a strong impact on the operation of photo-voltaic power generation station；A part is generator unit off-grid even all, also makes the effectiveness of reactive power compensation more be difficult to ensure that。
Summary of the invention
A kind of electric station reactive power distribution system based on voltage sensibility provided by the invention, the real-time output voltage gathered is sent to the first judgment means by harvester, so that the first judgment means judges according to reference voltage, when there is Voltage Drop, setting device real-time voltage of adjusting out falls the reactive power total amount needing compensation that value is corresponding；Dispensing controller is by calculating each generator unit and the reactive power compensation device sensitivity to grid-connected point voltage, the ratio accounting for total sensitivity according to respective sensitivity is distribution weight, carry out the distribution of reactive power total amount, the flexible science of distribution method, reasonably by the reactive power compensation of reduction to normal value, effectiveness is high；Greatly reduce the degree of unbalancedness of grid-connected point voltage, the powerful guarantee safe operation of photo-voltaic power generation station。
For reaching above-mentioned purpose, embodiments of the invention adopt the following technical scheme that
The present invention provides a kind of electric station reactive power distribution system based on voltage sensibility, including: harvester, the first judgment means, setting device, dispensing controller and reactive power compensator。
Described harvester is connected with the also site of electric station, is used for gathering real-time output voltage Ua, and described real-time output voltage Ua is sent to described first judgment means。
Wherein, electric station is photo-voltaic power generation station, comprises a plurality of current collection circuit L1, L2, L3 ... Li, every described current collection circuit is equipped with j generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij；The reactance of each described generator unit is X11, X12 ... X1j, X21, X22 ... X2j, X31, X32 ... X3j ... Xi1, Xi2 ... Xij。
According to described real-time output voltage Ua and reference voltage Ub, described first judgment means judges whether described electric station Voltage Drop occurs: if Ua is not less than Ub, then the output of described electric station is normal, Voltage Drop does not occur；If Ua is less than Ub, then there is Voltage Drop in described electric station, needs compensating power, and is calculated real-time voltage by computing module and fall value Uc, Uc=Ub-Ua；The described value computing module that falls is connected with setting device, and the described setting device described real-time voltage of acquisition falls value Uc and adjusts out when described real-time voltage falls the reactive power total amount Q that when value is Uc, described electric station needs compensate。
Dispensing controller comprises the first computing unit, the second computing unit, the 3rd computing unit and allocation units；Described first computing unit is according to formula: Xhk=, calculate the reactance of each described generator unit；Wherein, Xhk is the reactance of kth generator unit on the h article current collection circuit, 1≤h≤i, 1≤k≤j；Described second computing unit obtains described current collection circuit L1, L2, L3 ... voltage U1, U2, the U3 of Li ... Ui；According to formula: Shk=Xhk ÷ Uh, calculate described generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... the reactive power that Pij the sends sensitivity to described grid-connected point voltage；Wherein, Shk is the sensitivity to described grid-connected point voltage of reactive power that on the h article current collection circuit, kth generator unit sends, 1≤h≤i, 1≤k≤j；Described 3rd computing unit obtains reactive power compensator and accesses described electric station voltage USVG, according to formula: SSVG=XSVG÷USVG, calculate the sensitivity to described grid-connected point voltage of reactive power that described reactive power compensator sends；Wherein, SSVGThe reactive power sent for the described reactive power compensator sensitivity to described grid-connected point voltage, XSVGReactance for described reactive power compensator；Described allocation units are with each described generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j, ... Pi1, Pi2 ... it is distribution weight that the sensitivity of described grid-connected point voltage is accounted for the ratio of total sensitivity by the reactive power that Pij and described reactive power compensator send, and carries out described reactive power total amount Q distribution: the first allocation units are according to formula: Qhk=With each described generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j, ... Pi1, Pi2 ... it is distribution weight that the sensitivity of described grid-connected point voltage is accounted for the ratio of total sensitivity by the reactive power that Pij sends, to each described generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij carries out reactive power distribution；Second allocation units are according to formula: QSVG=, it is distribution weight that the sensitivity of described grid-connected point voltage is accounted for the ratio of total sensitivity by the reactive power that sends with described reactive power compensator, and described reactive power compensator is carried out reactive power distribution。
In conjunction with above-mentioned, the described electric station reactive power distribution system based on voltage sensibility, also include: the second judgment means and compensation control device。
Second judgment means obtains the allocation result of described first allocation units and each described generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j, ... Pi1, Pi2 ... the nominal reactive capacity of Pij, the allocation result of described second allocation units and the nominal reactive capacity of described reactive power compensator, judge each described generator unit P11, P12 respectively ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... whether Pij and described reactive power compensator are assigned with reactive power amount beyond its nominal reactive capacity；
If each described generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j, ... Pi1, Pi2 ... Pij and described reactive power compensator are assigned with reactive power amount all without departing from its nominal reactive capacity, then described compensation controls device control each described generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij and described reactive power compensator send reactive power and compensate according to being assigned with reactive power amount；
If any one or more described generator units or described reactive power compensator are assigned with reactive power amount beyond its nominal reactive capacity, then described compensation controls device and controls these any one or more described generator units or described reactive power compensator and send reactive power according to its nominal reactive capacity and compensate。
In conjunction with above-mentioned, the described electric station reactive power distribution system based on voltage sensibility, also include: owe value calculation apparatus and standby reactive power compensator。
When any one or more described generator units or described reactive power compensator are assigned with reactive power amount beyond its nominal reactive capacity, when these any one or more described generator units or described reactive power compensator send reactive power according to its nominal reactive capacity, described deficient value calculation apparatus calculates reactive power power back-off and owes value, and standby reactive power compensator is owed value according to described reactive power power back-off and sent reactive power。
A kind of electric station reactive power distribution system based on voltage sensibility provided by the invention, including: harvester, first judgment means, setting device, dispensing controller and reactive power compensator, by calculating the sensitivity to grid-connected point voltage of each generator unit and reactive power compensation device, the ratio accounting for total sensitivity according to respective sensitivity is distribution weight, carry out the distribution of reactive power total amount, compared to prior art, the flexible science of distribution method of the present invention, reasonably by the reactive power compensation of reduction to normal value, effectiveness is high；Greatly reduce the degree of unbalancedness of grid-connected point voltage, the powerful guarantee safe operation of photo-voltaic power generation station。
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below the accompanying drawing used required during embodiment is described is briefly described。
Fig. 1 is a kind of electric station reactive power distribution system configuration composition schematic diagram based on voltage sensibility in the embodiment of the present invention 1；
Fig. 2 is a kind of electric station reactive power distribution system configuration composition schematic diagram based on voltage sensibility in the embodiment of the present invention 2。
In figure, 1. electric station, 11. and site, 2. harvester, 3. the first judgment means, 31. computing modules, 4. setting device, 5. dispensing controller, 51. first computing units, 52. second computing units, 53. the 3rd computing unit, 54. allocation units, 541. first allocation units, 542. the second allocation units, 6. reactive power compensator, 7. the second judgment means, 8. compensate and control device, 9. owe value calculation apparatus, 10. standby reactive power compensator。
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described。Obviously, described embodiment is only a part of embodiment of the present invention, rather than whole embodiments。Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention。
Embodiment 1
The present invention provides a kind of electric station reactive power distribution system based on voltage sensibility, as it is shown in figure 1, include: harvester 2, and the first judgment means 3, setting device 4, dispensing controller 5 and reactive power compensator 6。
Described harvester 2 is connected with the also site 11 of electric station 1, is used for gathering real-time output voltage Ua, and described real-time output voltage Ua is sent to described first judgment means 3。
Wherein, electric station 1 comprises a plurality of current collection circuit L1, L2, L3 ... Li, every described current collection circuit is equipped with j generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij；The reactance of each described generator unit is X11, X12 ... X1j, X21, X22 ... X2j, X31, X32 ... X3j ... Xi1, Xi2 ... Xij。
According to described real-time output voltage Ua and reference voltage Ub, described first judgment means 3 judges whether described electric station 1 Voltage Drop occurs: if Ua is not less than Ub, then described electric station 1 exports normally, Voltage Drop does not occur；If Ua is less than Ub, then there is Voltage Drop in described electric station 1, needs compensating power, and is calculated real-time voltage by computing module 31 and fall value Uc, Uc=Ub-Ua；The described value computing module 31 that falls is connected with setting device 4, described setting device 4 obtain described real-time voltage fall value Uc adjust out when described real-time voltage fall value for Uc time described electric station 1 need compensate reactive power total amount Q。
Dispensing controller 5 comprises the first computing unit the 51, second computing unit the 52, the 3rd computing unit 53 and allocation units 54；Described first computing unit 51 is according to formula: Xhk=, calculate the reactance of each described generator unit；Wherein, Xhk is the reactance of kth generator unit on the h article current collection circuit, 1≤h≤i, 1≤k≤j；Described second computing unit 52 obtains described current collection circuit L1, L2, L3 ... voltage U1, U2, the U3 of Li ... Ui；According to formula: Shk=Xhk ÷ Uh, calculate described generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... the reactive power that Pij sends is to described and site 11 voltage sensitivity；Wherein, Shk is that reactive power that on the h article current collection circuit, kth generator unit sends is to described and site 11 voltage sensitivity, 1≤h≤i, 1≤k≤j；Described 3rd computing unit 53 obtains reactive power compensator 6 and accesses described electric station 1 voltage USVG, according to formula: SSVG=XSVG÷USVG, calculate reactive power that described reactive power compensator 6 sends to described and site 11 voltage sensitivity；Wherein, SSVGThe reactive power sent for described reactive power compensator 6 is to described and site 11 voltage sensitivity, XSVGReactance for described reactive power compensator 6；Described allocation units 54 are with each described generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j, ... Pi1, Pi2 ... it is distribution weight that described and site 11 voltage sensitivity is accounted for the ratio of total sensitivity by the reactive power that Pij and described reactive power compensator 6 send, and carries out described reactive power total amount Q distribution: the first allocation units 541 are according to formula: Qhk=With each described generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j, ... Pi1, Pi2 ... it is distribution weight that described and site 11 voltage sensitivity is accounted for the ratio of total sensitivity by the reactive power that Pij sends, to each described generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij carries out reactive power distribution；Second allocation units 542 are according to formula: QSVG=, it is distribution weight that described and site 11 voltage sensitivity is accounted for the ratio of total sensitivity by the reactive power that sends with described reactive power compensator 6, and described reactive power compensator 6 is carried out reactive power distribution。
A kind of electric station reactive power distribution system based on voltage sensibility provided by the invention, including: the real-time output voltage gathered is sent to the first judgment means by harvester, so that the first judgment means judges according to reference voltage, when there is Voltage Drop, setting device real-time voltage of adjusting out falls the reactive power total amount needing compensation that value is corresponding；Dispensing controller is by calculating each generator unit and the reactive power compensation device sensitivity to grid-connected point voltage, the ratio accounting for total sensitivity according to respective sensitivity is distribution weight, carry out the distribution of reactive power total amount, compared to prior art, the flexible science of distribution method of the present invention, reasonably by the reactive power compensation of reduction to normal value, effectiveness is high；Greatly reduce the degree of unbalancedness of grid-connected point voltage, the powerful guarantee safe operation of photo-voltaic power generation station。
Embodiment 2
A kind of electric station reactive power distribution system based on voltage sensibility of the embodiment of the present invention, as shown in Figure 2, including: harvester 2, first judgment means 3, setting device 4, dispensing controller 5, reactive power compensator 6, second judgment means 7, compensates and controls device 8, owes value calculation apparatus 9 and standby reactive power compensator 10。
Described harvester 2 is connected with the also site 11 of electric station 1, is used for gathering real-time output voltage Ua, and described real-time output voltage Ua is sent to described first judgment means 3。
Wherein, electric station 1 is photo-voltaic power generation station, comprises a plurality of current collection circuit L1, L2, L3 ... Li, every described current collection circuit is equipped with j generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij；The reactance of each described generator unit is X11, X12 ... X1j, X21, X22 ... X2j, X31, X32 ... X3j ... Xi1, Xi2 ... Xij。
According to described real-time output voltage Ua and reference voltage Ub, described first judgment means 3 judges whether described electric station 1 Voltage Drop occurs: if Ua is not less than Ub, then described electric station 1 exports normally, Voltage Drop does not occur；If Ua is less than Ub, then there is Voltage Drop in described electric station 1, needs compensating power, and is calculated real-time voltage by computing module 31 and fall value Uc, Uc=Ub-Ua；The described value computing module 31 that falls is connected with setting device 4, described setting device 4 obtain described real-time voltage fall value Uc adjust out when described real-time voltage fall value for Uc time described electric station 1 need compensate reactive power total amount Q。
Dispensing controller 5 comprises the first computing unit the 51, second computing unit the 52, the 3rd computing unit 53 and allocation units 54；Described first computing unit 51 is according to formula: Xhk=, calculate the reactance of each described generator unit；Wherein, Xhk is the reactance of kth generator unit on the h article current collection circuit, 1≤h≤i, 1≤k≤j；Described second computing unit 52 obtains described current collection circuit L1, L2, L3 ... voltage U1, U2, the U3 of Li ... Ui；According to formula: Shk=Xhk ÷ Uh, calculate described generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... the reactive power that Pij sends is to described and site 11 voltage sensitivity；Wherein, Shk is that reactive power that on the h article current collection circuit, kth generator unit sends is to described and site 11 voltage sensitivity, 1≤h≤i, 1≤k≤j；Described 3rd computing unit 53 obtains reactive power compensator 6 and accesses described electric station 1 voltage USVG, according to formula: SSVG=XSVG÷USVG, calculate reactive power that described reactive power compensator 6 sends to described and site 11 voltage sensitivity；Wherein, SSVG is that the reactive power that sends of described reactive power compensator 6 is to described and site 11 voltage sensitivity, XSVGReactance for described reactive power compensator 6；Described allocation units 54 are with each described generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j, ... Pi1, Pi2 ... it is distribution weight that described and site 11 voltage sensitivity is accounted for the ratio of total sensitivity by the reactive power that Pij and described reactive power compensator 6 send, and carries out described reactive power total amount Q distribution: the first allocation units 541 are according to formula: Qhk=With each described generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j, ... Pi1, Pi2 ... it is distribution weight that described and site 11 voltage sensitivity is accounted for the ratio of total sensitivity by the reactive power that Pij sends, to each described generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij carries out reactive power distribution；Second allocation units 54 are according to formula: QSVG=, it is distribution weight that described and site 11 voltage sensitivity is accounted for the ratio of total sensitivity by the reactive power that sends with described reactive power compensator 6, and described reactive power compensator 6 is carried out reactive power distribution。
Second judgment means 7 obtains the allocation result of described first allocation units 541 and each described generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j, ... Pi1, Pi2 ... the nominal reactive capacity of Pij, the allocation result of described second allocation units 542 and the nominal reactive capacity of described reactive power compensator 6, judge each described generator unit P11, P12 respectively ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... whether Pij and described reactive power compensator 6 are assigned with reactive power amount beyond its nominal reactive capacity。
If each described generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j, ... Pi1, Pi2 ... Pij and described reactive power compensator 6 are assigned with reactive power amount all without departing from its nominal reactive capacity, then the described control device 8 that compensates controls each described generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij and described reactive power compensator 6 send reactive power and compensate according to being assigned with reactive power amount。
If any one or more described generator units or described reactive power compensator 6 are assigned with reactive power amount beyond its nominal reactive capacity, then described compensation controls device 8 and controls these any one or more described generator units or described reactive power compensator 6 sends reactive power according to its nominal reactive capacity and compensates。
When any one or more described generator units or described reactive power compensator 6 are assigned with reactive power amount beyond its nominal reactive capacity, when these any one or more described generator units or described reactive power compensator 6 send reactive power according to its nominal reactive capacity, described deficient value calculation apparatus 9 calculates reactive power power back-off and owes value, standby reactive power compensator 10 is owed value according to described reactive power power back-off and is sent reactive power, namely it is equal that the reactive power value that standby reactive power compensator 10 sends owes value with reactive power power back-off, to guarantee the reactive power compensation that falls to normal value。
A kind of electric station reactive power distribution system based on voltage sensibility provided by the invention, including: the real-time output voltage gathered is sent to the first judgment means by harvester, so that the first judgment means judges according to reference voltage, when there is Voltage Drop, setting device real-time voltage of adjusting out falls the reactive power total amount needing compensation that value is corresponding；Dispensing controller is by calculating each generator unit and the reactive power compensation device sensitivity to grid-connected point voltage, the ratio accounting for total sensitivity according to respective sensitivity is distribution weight, carry out the distribution of reactive power total amount, compared to prior art, the flexible science of distribution method of the present invention, reasonably by the reactive power compensation of reduction to normal value, effectiveness is high；Greatly reduce the degree of unbalancedness of grid-connected point voltage, the powerful guarantee safe operation of photo-voltaic power generation station。
Further, the embodiment of the present invention adds the second judgment means, compensate and control device, owe value calculation apparatus and standby reactive power compensator, when the second judgment means judges that the reactive power amount that any one or more generator unit or reactive power compensator are assigned with exceeds its nominal reactive capacity, compensate and control device and control these any one or more generator units or reactive power compensator and send reactive power according to its specified reactive capability and compensate, owe value calculation apparatus and calculate the deficient value of reactive power power back-off, standby reactive power compensator sends the reactive power amount that value is equal of owing with reactive power power back-off, by the reactive power compensation that falls to normal value, effectiveness of the invention is improve while protection power station facility and reactive power compensator。
The above; being only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any those familiar with the art is in the technical scope that the invention discloses; the change that can readily occur in or replacement, all should be encompassed within protection scope of the present invention。Therefore, protection scope of the present invention should be as the criterion with described scope of the claims。
Claims (4)
1. the electric station reactive power distribution system based on voltage sensibility, it is characterised in that including: harvester (2), the first judgment means (3), setting device (4), dispensing controller (5) and reactive power compensator (6)；
Described harvester (2) is connected with the also site (11) of electric station (1), is used for gathering real-time output voltage Ua, and described real-time output voltage Ua is sent to described first judgment means (3)；Wherein, described electric station (1) comprises a plurality of current collection circuit L1, L2, L3 ... Li, every described current collection circuit is equipped with j generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij；The reactance of each described generator unit is X11, X12 ... X1j, X21, X22 ... X2j, X31, X32 ... X3j ... Xi1, Xi2 ... Xij；
According to described real-time output voltage Ua and reference voltage Ub, described first judgment means (3) judges whether described electric station (1) Voltage Drop occurs: if Ua is not less than Ub, then described electric station (1) output is normal, Voltage Drop does not occur；If Ua is less than Ub, then there is Voltage Drop in described electric station (1), needs compensating power, and is calculated real-time voltage by computing module (31) and fall value Uc, Uc=Ub-Ua；The described value computing module (31) that falls is connected with setting device (4), described setting device (4) obtain described real-time voltage fall value Uc adjust out when described real-time voltage fall value for Uc time described electric station (1) need compensate reactive power total amount Q；
Dispensing controller (5) comprises the first computing unit (51), the second computing unit (52), the 3rd computing unit (53) and allocation units (54)；Described first computing unit (51) is according to formula: Xhk=, calculate the reactance of each described generator unit；Wherein, Xhk is the reactance of kth generator unit on the h article current collection circuit, 1≤h≤i, 1≤k≤j；Described second computing unit (52) obtains described current collection circuit L1, L2, L3 ... voltage U1, U2, the U3 of Li ... Ui；According to formula: Shk=Xhk ÷ Uh, calculate described generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... the reactive power that Pij the sends sensitivity to described and site (11) voltage；Wherein, Shk is the sensitivity to described and site (11) voltage of reactive power that on the h article current collection circuit, kth generator unit sends, 1≤h≤i, 1≤k≤j；Described 3rd computing unit (53) obtains reactive power compensator (6) and accesses described electric station (1) voltage USVG, according to formula: SSVG=XSVG÷USVG, calculate the sensitivity to described and site (11) voltage of reactive power that described reactive power compensator (6) sends；Wherein, SSVGThe reactive power sent for described reactive power compensator (6) sensitivity to described and site (11) voltage, XSVGReactance for described reactive power compensator (6)；Described allocation units (54) are with each described generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j, ... Pi1, Pi2 ... it is distribution weight that the sensitivity of described and site (11) voltage is accounted for the ratio of total sensitivity by the reactive power that Pij and described reactive power compensator (6) send, and carries out described reactive power total amount Q distribution: the first allocation units (541) are according to formula: Qhk=With each described generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j, ... Pi1, Pi2 ... it is distribution weight that the sensitivity of described and site (11) voltage is accounted for the ratio of total sensitivity by the reactive power that Pij sends, to each described generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij carries out reactive power distribution；Second allocation units (542) are according to formula: QSVG=, it is distribution weight that the sensitivity of described and site (11) voltage is accounted for the ratio of total sensitivity by the reactive power that sends with described reactive power compensator (6), and described reactive power compensator (6) is carried out reactive power distribution。
2. the electric station reactive power distribution system based on voltage sensibility according to claim 1, it is characterised in that also include: the second judgment means (7) and compensation control device (8)；
Second judgment means (7) obtains the allocation result of described first allocation units (541) and each described generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j, ... Pi1, Pi2 ... the nominal reactive capacity of Pij, the allocation result of described second allocation units (542) and the nominal reactive capacity of described reactive power compensator (6), judge each described generator unit P11 respectively, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j, ... Pi1, Pi2 ... whether Pij and described reactive power compensator (6) are assigned with reactive power amount beyond its described nominal reactive capacity；
If each described generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j, ... Pi1, Pi2 ... Pij and be assigned with reactive power amount described in described reactive power compensator (6) all without departing from nominal reactive capacity it described, then described compensation controls device (8) and controls each described generator unit P11, P12 ... P1j, P21, P22 ... P2j, P31, P32 ... P3j ... Pi1, Pi2 ... Pij and described reactive power compensator (6) send reactive power compensate according to the described reactive power amount that is assigned with；
If being assigned with reactive power amount described in any one or more described generator units or described reactive power compensator (6) beyond its described nominal reactive capacity, then described compensation controls device (8) and controls these any one or more described generator units or described reactive power compensator (6) sends reactive power according to nominal reactive capacity it described and compensates。
3. the electric station reactive power distribution system based on voltage sensibility according to claim 2, it is characterised in that also include: owe value calculation apparatus (9) and standby reactive power compensator (10)；
When being assigned with reactive power amount described in any one or more described generator units or described reactive power compensator (6) beyond its described nominal reactive capacity, these any one or more described generator units or described reactive power compensator (6) are according to when it described, nominal reactive capacity sends reactive power, described deficient value calculation apparatus (9) calculates reactive power power back-off and owes value, and standby reactive power compensator (10) is owed value according to described reactive power power back-off and sent reactive power。
4. the electric station reactive power distribution system based on voltage sensibility according to claim 1, it is characterised in that including:
Described electric station (1) is photo-voltaic power generation station。
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