CN105552926A - Reactive power compensation method and system of electric field - Google Patents
Reactive power compensation method and system of electric field Download PDFInfo
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- CN105552926A CN105552926A CN201610004090.0A CN201610004090A CN105552926A CN 105552926 A CN105552926 A CN 105552926A CN 201610004090 A CN201610004090 A CN 201610004090A CN 105552926 A CN105552926 A CN 105552926A
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1807—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators
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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 provides a reactive power compensation method and system of an electric field, which is used for the electric filed using a new energy source to generate power. The method comprises the following steps of acquiring a topological graph of an inputting state and a switching state of each capacitive reactor in the electric field by the system, and acquiring an actual reactive power q0 of a grid-connected point in the electric field and a target reactive power q3 corresponding to the grid-connected point; and adjusting the switching states of a part of capacitive reactors in the electric field and/or adjusting a reactive power q2 output from a reactive power compensation device in the electric field according to a difference value Delta q between the actual reactive power and the target reactive power and a sensitive reactive power section or a capacitive reactive power section where the actual reactive power and the target reactive power are respectively dropped. By the reactive power compensation method and system, the change of the target reactive power can be responded timely, and real-time automatic adjustment of voltage or reactive power of the electric field is achieved.
Description
Technical field
The present invention relates to the power back-off field of new energy electric field, particularly relate to a kind of Non Power Compensation Process and system of electric field.
Background technology
Reactive voltage controls automatically, and (AVC) utilizes network communication and automatic control technology, the busbar voltage instruction that real-time reception homophony issues or idle instruction, automatically carry out real-time tracking to high side bus voltage/idle and regulate and control reactive power compensator to meet homophony requirement.Wind energy turbine set/photovoltaic station is considered as a large sized unit and is presented in face of power network dispatching system by AVC control system, make it that there is adjustability and controllability, be that power network dispatching system realizes the good bridge controlled to wind energy turbine set/photovoltaic station, effectively can improve the receiving ability of electrical network to wind-powered electricity generation/photovoltaic.
Power network dispatching system is to AVC module transmitting order to lower levels, and AVC module calculates the Target of Reactive Power value of reactive power compensator according to the order of the remote measure and communication information of collecting device and dispatching down distributing, and result of calculation is issued module by order is handed down to each reactive power compensator.
The reactive-load compensation equipment that wind energy turbine set and photovoltaic station use comprises: blower fan, inverter, static passive compensation device SVC/SVG and capacitive reactance device.The reactive power compensators such as blower fan, inverter, SVC/SVG belong to continuous compensation device, its fast response time and more accurate, and capacitive reactance device belongs to discrete device, be used alone capacitive reactance device can not exactly by Reactive-power control to desired value.Due to economic cause, still there is the phenomenon using capacitive reactance device to carry out reactive power compensation in part station.Therefore, how by capacitive reactance device and other Continuous Var Compensation device with the use of, become one of problem that everybody pays close attention to.
Summary of the invention
The embodiment of the present invention provides a kind of Non Power Compensation Process and system of electric field, for solve in prior art cannot effectively in conjunction with capacitive reactance device and reactive power compensating apparatus to and the problem that compensates of the reactive power of site.
Based on above-mentioned purpose, the invention provides a kind of Non Power Compensation Process of electric field, comprising: obtain the throwing state of each capacitive reactance device in electric field and cut the topological diagram of state, and obtaining the actual reactive power q of in described electric field and site
0, and correspondence described in and the target reactive power q of site
3; According to the difference DELTA q between described actual reactive power and target reactive power, and described actual reactive power and target reactive power fall into lagging reactive power interval respectively or capacitive reactive power is interval, adjust the switching state of at least part of capacitive reactance device in described electric field and/or adjust the reactive power q that the reactive power compensating apparatus in described electric field exports
2.
Preferably, described according to the difference DELTA q between actual reactive power and target reactive power, and described actual reactive power and target reactive power fall into lagging reactive power interval respectively, or capacitive reactive power is interval, adjust the switching state of at least part of capacitive reactance device in described electric field, and/or the mode adjusting reactive power compensating apparatus described in described electric field comprises following at least one: when actual reactive power and target reactive power all fall into lagging reactive power interval, or when all falling into capacitive reactive power interval, the reactive power q that described reactive power compensating apparatus exports is adjusted according to described difference DELTA q
2, when actual reactive power and target reactive power all fall into lagging reactive power interval or all fall into capacitive reactive power interval, according to formula
determine throwing state to be transferred to the corresponding capacitance device of the state of cutting or the quantity of reactor, and adjusted by determined quantity m, wherein, q is the reactive power of capacitor or reactor.
Preferably, described according to the difference DELTA q between actual reactive power and target reactive power, and described actual reactive power and target reactive power fall into lagging reactive power interval respectively, or capacitive reactive power is interval, adjust the switching state of at least part of capacitive reactance device in described electric field, and/or the mode adjusting reactive power compensating apparatus described in described electric field comprise following any one: when actual reactive power falls into lagging reactive power interval, and target reactive power fall into capacitive reactive power interval time, control all reactors in described electric field and change by the state of throwing the state of cutting into, obtain the actual reactive power q that in current described electric field, generating equipment exports again
1, described reactive power compensating apparatus actual reactive power q
2and described difference DELTA q, and according to formula
determine the capacitors count m that the state of cutting need be transferred to throwing state
c, and by determined quantity m
cadjusted, wherein, q
cfor the reactive power of capacitor, when actual reactive power falls into capacitive reactive power interval and target reactive power falls into lagging reactive power interval, control all capacitors in described electric field and change by the state of throwing the state of cutting into, then obtain the actual reactive power q that in current described electric field, generating equipment exports
1, described reactive power compensating apparatus actual reactive power q
2and described difference DELTA q, and according to formula
determine the reactor quantity m that the state of cutting need be transferred to throwing state
l, and by determined quantity m
ladjusted, wherein, q
lfor the reactive power of reactor.
Preferably, in described adjustment electric field, the mode of the switching state of at least part of capacitive reactance device comprises: after the reactor quantity determining wanted transition status or capacitors count, estimate respectively according to determined quantity adjust after and the actual reactive power of site and according to determined quantity add institute after 1 adjust after the actual reactive power of also site, selection is wherein close to target reactive power q
3reactive power, and according to the quantity corresponding to selected reactive power, adjust the switching state of corresponding reactor or capacitor.
Preferably, in described adjustment electric field, the mode of the switching state of at least part of capacitive reactance device comprises: when the reactor quantity or capacitors count that will adjust state be more than or equal to can the corresponding reactor of transition status or capacitors count time, by all institute's energy reactor of transition status or the state of capacitor are changed; The part of described capacitive reactance device deficiency is regulated again according to the adjustable reactive power of the residue of described reactive power compensating apparatus.
Based on above-mentioned purpose, the present invention also provides a kind of reactive power compensation system of electric field, comprising: acquisition module, for obtaining the throwing state of each capacitive reactance device in electric field and cutting the topological diagram of state, and obtains the actual reactive power q of in described electric field and site
0, and correspondence described in and the target reactive power q of site
3; Compensating module, for according to the difference DELTA q between described actual reactive power and target reactive power, and described actual reactive power and target reactive power fall into lagging reactive power interval respectively or capacitive reactive power is interval, adjust the switching state of at least part of capacitive reactance device in described electric field and/or adjust the reactive power q that the reactive power compensating apparatus in described electric field exports
2.
Preferably, described compensating module is used for following at least one: when actual reactive power and target reactive power all fall into lagging reactive power interval or all fall into capacitive reactive power interval time, adjust according to described difference DELTA q the reactive power q that described reactive power compensating apparatus exports
2; When actual reactive power and target reactive power all fall into lagging reactive power interval or all fall into capacitive reactive power interval, according to formula
determine throwing state to be transferred to the corresponding capacitance device of the state of cutting or the quantity of reactor, and adjusted by determined quantity m; Wherein, q is the reactive power of capacitor or reactor.
Preferably, described compensating module be used for following any one: when actual reactive power fall into lagging reactive power interval and target reactive power fall into capacitive reactive power interval time, control all reactors in described electric field and change by the state of throwing the state of cutting into, then obtain the actual reactive power q that in current described electric field, generating equipment exports
1, described reactive power compensating apparatus actual reactive power q
2and described difference DELTA q, and according to formula
determine the capacitors count m that the state of cutting need be transferred to throwing state
c, and by determined quantity m
cadjusted, wherein, q
cfor the reactive power of capacitor; When actual reactive power falls into capacitive reactive power interval and target reactive power falls into lagging reactive power interval, control all capacitors in described electric field and change by the state of throwing the state of cutting into, then obtain the actual reactive power q that in current described electric field, generating equipment exports
1, described reactive power compensating apparatus actual reactive power q
2and described difference DELTA q, and according to formula
determine the reactor quantity m that the state of cutting need be transferred to throwing state
l, and by determined quantity m
ladjusted, wherein, q
lfor the reactive power of reactor.
Preferably, described compensating module is used for after the reactor quantity determining wanted transition status or capacitors count, estimate respectively according to determined quantity adjust after and the actual reactive power of site and according to determined quantity add institute after 1 adjust after the actual reactive power of also site, selection is wherein close to target reactive power q
3reactive power, and according to the quantity corresponding to selected reactive power, adjust the switching state of corresponding reactor or capacitor.
Preferably, described compensating module is used for when the reactor quantity or capacitors count that will adjust state are more than or equal to institute's energy corresponding reactor of transition status or capacitors count, whole energy reactor of transition status or the state of capacitor is changed; The part of described capacitive reactance device deficiency is regulated again according to the adjustable reactive power of the residue of described reactive power compensating apparatus.
As mentioned above, the Non Power Compensation Process of electric field of the present invention and system, there is following beneficial effect: the switching state topology figure obtaining the capacitive reactance device in electric field, determine the switching state of each capacitive reactance device, be convenient to accurately control the reactive power compensation in electric field, simultaneously, calculate the difference of actual reactive power and target reactive power, adjust reactive power compensation device and/or capacitive reactance device, the change of target reactive power can be responded in time, realize voltage of electric field or idle automatic adjustment; In addition, to regulate the switching state of capacitive reactance device as coarse adjustment, the adjustment of reactive power compensating apparatus, as the compound mode of thin tuning, can regulate the reactive power that will compensate fast and accurately; Further, estimate the reactive power after the capacitive reactance device adjustment of adjacent quantity, select wherein closer to the capacitive reactance device quantity of target reactive power, ensure to regulate result as far as possible close to desired value.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing the embodiment of the present invention is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the content of the embodiment of the present invention and these accompanying drawings.
Fig. 1 is the method flow diagram of an embodiment of the Non Power Compensation Process of electric field of the present invention.
Fig. 2 is the block diagram of an embodiment of the reactive power compensation system of electric field of the present invention.
Embodiment
The technical problem solved for making the present invention, the technical scheme of employing and the technique effect that reaches are clearly, be described in further detail below in conjunction with the technical scheme of accompanying drawing to the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those skilled in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, the invention provides a kind of Non Power Compensation Process of electric field.Wherein, described electric field includes but not limited to: photovoltaic DC field, Wind Power Stations etc.Reactive power compensating apparatus is comprised and also for capacitor and the reactor of compensating power in described electric field.Described reactive power compensating apparatus includes but not limited to: blower fan, inverter, static passive compensation device SVC/SVG etc.Described reactive power compensating apparatus is the summation of above-mentioned each device.Capacitive reactance device is referred to as by described capacitor and reactor, is distributed in as generating equipment etc. needs each equipment place of consume reactive power, each capacitive reactance device to be provided with the switching device for the corresponding capacitive reactance device of ON/OFF.Each described switching device controls by long-range bucking-out system, the throwing state (i.e. conducting state) of current capacitive reactance device/cut state (i.e. off-state) can be provided, corresponding switching state can be switched, to adjust the reactive power of whole electric field again based on the instruction of bucking-out system.Compensation method of the present invention performs primarily of described bucking-out system.Described bucking-out system can be arranged on the control centre of electric field, and with high-level scheduling system communication, for receiving and the target reactive power of site.Specific as follows:
In step sl, described bucking-out system obtains the throwing state of each capacitive reactance device in electric field and cuts the topological diagram of state, and obtains the actual reactive power q of in described electric field and site
0, and correspondence described in and the target reactive power q of site
3.
At this, communicating with each switching device of described bucking-out system timing, to obtain the switching state of each capacitive reactance device, and calculates topology.Equally, described bucking-out system also timing acquisition and the actual reactive power of site.Before receiving new target reactive power, described bucking-out system is monitored with the current target reactive power obtained, and performs step S2, to be compensated in real time.
In step s 2, described bucking-out system is according to the difference DELTA q between described actual reactive power and target reactive power, and described actual reactive power and target reactive power fall into lagging reactive power interval respectively or capacitive reactive power is interval, adjust the switching state of at least part of capacitive reactance device in described electric field and/or adjust the reactive power q that the reactive power compensating apparatus in described electric field exports
2.
In one embodiment, described bucking-out system, by detecting current the exported reactive power of described reactive power compensating apparatus, obtains reactive power compensating apparatus and remains adjustable reactive power q
ad, and at described Δ q < q
adtime, adjust the reactive power q that described reactive power compensating apparatus exports
2, make exported reactive power be q
2+ Δ q.
Such as, described bucking-out system detects actual reactive power q
0with target reactive power q
3all fall into lagging reactive power interval or all fall into capacitive reactive power interval, and obtaining q
3-q
0=Δ q.Described bucking-out system also detects current the exported reactive power q of described reactive power compensating apparatus
2, and the adjustable reactive power q of current residual is obtained according to the maximum reactive power of output of the described reactive power compensating apparatus obtained in advance
ad.As Δ q < q
adtime, described bucking-out system can regulate the adjustable reactive power of residue of each device in described reactive power compensating apparatus successively according to the adjustment order preset ,/decline Δ the q until the actual reactive power exported floats.
At this, the interval that described lagging reactive power interval is less than 0 for reactive power; The interval that described capacitive reactive power interval is greater than 0 for reactive power.
In another embodiment, described bucking-out system, by detecting current the exported reactive power of described reactive power compensating apparatus, obtains reactive power compensating apparatus and remains adjustable reactive power q
ad, and at described Δ q > q
adtime, adjust the switching state of at least part of capacitive reactance device in described electric field.
Particularly, when the actual reactive power that described bucking-out system obtains and target reactive power all fall into lagging reactive power interval or all fall into capacitive reactive power interval, according to formula
determine throwing state to be transferred to the corresponding capacitance device of the state of cutting or the quantity of reactor, and adjusted by determined quantity m; Wherein, q is the reactive power of capacitor or reactor.
Such as, described bucking-out system obtains q
0<0, q
3<0 and the Δ q < 0, the down that obtain
l< | Δ q|, then by formula
integer part in result as the quantity of the reactor that will adjust, and transfers the reactor being in the state of cutting to throwing state according to obtained quantity.Now, q can by q
lreplace, q
lfor the reactive power of reactor, down
lfor the maximum inductive reactive power that reactive power compensating apparatus can be lowered.Q
lbe exemplified as the rated reactive power of capacitor.
And for example, described bucking-out system obtains q
0> 0, q
3> 0 and the Δ q < 0, the down that obtain
c< | Δ q|, then by formula
integer part in result as the quantity of the capacitor that will adjust, and transfers the capacitor being in throwing state to cutting state according to obtained quantity.Now, q can by q
creplace, q
cfor the reactive power value of capacitor, down
cfor the maximum capacitive reactive power that reactive power compensating apparatus can be lowered.Wherein, q
cfor the rated reactive power of capacitor of illustrating.
At this, described bucking-out system is after the switching state of capacitive reactance device having adjusted respective numbers, also may cannot reach target reactive power, then described bucking-out system can continue to reach target reactive power according to the adjustable reactive power of the residue of reactive power compensating apparatus as far as possible.
At this, the mode of described bucking-out system adjustment reactive power compensating apparatus is described aforementioned.Do not repeat them here.
Also have in a kind of mode, when described bucking-out system determine obtained actual reactive power fall into lagging reactive power interval and target reactive power fall into capacitive reactive power interval time, control all reactors in described electric field and change by the state of throwing the state of cutting into, then obtain the actual reactive power q that in current described electric field, generating equipment exports
1, described reactive power compensating apparatus actual reactive power q
2and described difference DELTA q, and according to formula
determine the capacitors count m that the state of cutting need be transferred to throwing state
c, and by determined quantity m
cadjusted, wherein, q
cfor the reactive power of capacitor.
Such as, when described bucking-out system determine obtained actual reactive power fall into lagging reactive power interval and target reactive power fall into capacitive reactive power interval time, described bucking-out system first disconnects all reactors, namely controls all reactors and transfers by the state of throwing the state of cutting to.Obtain the actual reactive power q that in current described electric field, generating equipment exports again
1, described reactive power compensating apparatus actual reactive power q
2and described difference DELTA q, and according to formula
determine the capacitors count m that the state of cutting need be transferred to throwing state
c, and control institute quantification m
ccapacitor transfer throwing state to by the state of cutting.
At this, described bucking-out system can choose the capacitor of institute's quantification according to device action time order and function, and controls its change oneself state.Also the switching state of the capacitor of institute's quantification can be changed according to the priority preset.
In another kind of mode, when the actual reactive power that described bucking-out system obtains falls into capacitive reactive power interval and target reactive power falls into lagging reactive power interval, control all capacitors in described electric field and change by the state of throwing the state of cutting into, then obtain the actual reactive power q that in current described electric field, generating equipment exports
1, described reactive power compensating apparatus actual reactive power q
2and described difference DELTA q, and according to formula
determine the reactor quantity m that the state of cutting need be transferred to throwing state
l, and by determined quantity m
ladjusted, wherein, q
lfor the reactive power of reactor.
Such as, when described bucking-out system determine obtained actual reactive power fall into lagging reactive power interval and target reactive power fall into capacitive reactive power interval time, described bucking-out system first disconnects all capacitors, namely controls all capacitors and transfers by the state of throwing the state of cutting to.Obtain the actual reactive power q that in current described electric field, generating equipment exports again
1, described reactive power compensating apparatus actual reactive power q
2and described difference DELTA q, and according to formula
determine the reactor quantity m that the state of cutting need be transferred to throwing state
l, and control institute quantification m
lreactor transfer throwing state to by the state of cutting.
At this, described bucking-out system can choose the reactor of institute's quantification according to device action time order and function, and controls its change oneself state.Also the switching state of the reactor of institute's quantification can be changed according to the priority preset.
In more complicated actual conditions, adjust corresponding capacitive reactance device according to calculated quantity, and not necessarily can compensate and the actual reactive power of site accurately, also needs to utilize reactive power compensating apparatus to finely tune.Now, quantity calculated in the manner described above adjusts capacitive reactance device, also needs the residue reactive power considering that reactive power compensating apparatus can regulate, and is that the reactive power of also site compensates so that maximum.For this reason, the present invention, when the capacitive reactance device quantity obtaining adjusting according to above-mentioned either type, also performs following steps further:
Described bucking-out system is after the reactor quantity determining wanted transition status or capacitors count, estimate respectively according to determined quantity adjust after and the actual reactive power of site and according to determined quantity add institute after 1 adjust after the actual reactive power of also site, selection is wherein close to target reactive power q
3reactive power, and according to the quantity corresponding to selected reactive power, adjust the switching state of corresponding reactor or capacitor.
Particularly, described bucking-out system is at the reactor quantity m determining to adjust
lafter, estimate respectively according to quantity m
lthe actual reactive power q of the also site after adjustment
0"=q
0-mq
l-q
1-q
2, and estimate according to quantity (m
l+ 1) the actual reactive power q of the also site after adjustment
0'=q
0-(m+1) q
l+ q
ad'.Wherein, estimating according to quantity (m
l+ 1), during the reactive power that the reactor after adjustment exports, described bucking-out system also contemplates the reverse regulating power q of reactive power compensating apparatus
ad' (as idle upper timing q
ad' represent that ability lowered by compensation equipment, as idle lower timing q
ad' represent rise ability, the reactive power exported is greater than 0 for capacitive reactive power, and the reactive power exported is less than 0 for lagging reactive power).Select q again
0' and q
0" in closest to target reactive power q
3reactive power, and according to the quantity corresponding to selected reactive power, adjust the switching state of corresponding reactor.
In like manner can obtain, described bucking-out system is at the capacitors count m determining to adjust
cafter, estimate respectively according to quantity m
cthe actual reactive power q of the also site after adjustment
0"=q
0-mq
c-q
1-q
2, and estimate according to quantity (m
c+ 1) the actual reactive power q of the also site after adjustment
0'=q
0-(m+1) q
c+ q
ad'.Wherein, estimating according to quantity (m
c+ 1), during the reactive power that the capacitor after adjustment exports, described bucking-out system also contemplates the reverse regulating power q of reactive power compensating apparatus
ad' (as idle upper timing q
ad' represent that ability lowered by compensation equipment, as idle lower timing q
ad' represent rise ability, the reactive power exported is greater than 0 for capacitive reactive power, and the reactive power exported is less than 0 for lagging reactive power).Select q again
0' and q
0" in closest to target reactive power q
3reactive power, and according to the quantity corresponding to selected reactive power, adjust the switching state of corresponding capacitor.
Then, described bucking-out system, after the switching state of adjustment capacitive reactance device, continues the reactive power that adjustment reactive power compensating apparatus exports, to reach described target reactive power q
3.
A kind of limiting case is, in the scheme of the above-mentioned each capacitive reactance device of adjustment, when described bucking-out system to adjust the reactor quantity of state or capacitors count be more than or equal to can the corresponding reactor of transition status or capacitors count time, by all institute's energy reactor of transition status or the state of capacitor are changed; The part of described capacitive reactance device deficiency is regulated again according to the adjustable reactive power of the residue of described reactive power compensating apparatus.
Such as, when the difference DELTA q that described bucking-out system obtains exceeds the scope that capacitive reactance device can adjust, after all capacitive reactance devices adjust according to above-mentioned each scheme by described bucking-out system, the more current actual reactive power q of described reactive power compensating apparatus is obtained
2, and obtain current difference DELTA q ', then compensate current difference Δ q ' according to the remaining adjustable reactive power of described reactive power compensating apparatus.
As shown in Figure 2, the invention provides a kind of reactive power compensation system of electric field.Wherein, described electric field includes but not limited to: photovoltaic DC field, Wind Power Stations etc.Reactive power compensating apparatus is comprised and also for capacitor and the reactor of compensating power in described electric field.Described reactive power compensating apparatus includes but not limited to: blower fan, inverter, static passive compensation device SVC/SVG etc.Described reactive power compensating apparatus is the summation of above-mentioned each device.Capacitive reactance device is referred to as by described capacitor and reactor, is distributed in as generating equipment etc. needs each equipment place of consume reactive power, each capacitive reactance device to be provided with the switching device for the corresponding capacitive reactance device of ON/OFF.Each described switching device controls by long-range bucking-out system, the throwing state (i.e. conducting state) of current capacitive reactance device/cut state (i.e. off-state) can be provided, corresponding switching state can be switched, to adjust the reactive power of whole electric field again based on the instruction of bucking-out system.Bucking-out system of the present invention can be arranged on the control centre of electric field, and with high-level scheduling system communication, for receiving and the target reactive power of site.Specific as follows:
Described bucking-out system 1 comprises: acquisition module 11 and compensating module 12.
Described acquisition module 11 for calculating the throwing state of each capacitive reactance device in electric field and cutting the topological diagram of state, and obtains the actual reactive power q of in described electric field and site
0, and correspondence described in and the target reactive power q of site
3.
At this, communicating with each switching device of described acquisition module 11 timing, to obtain the switching state of each capacitive reactance device, and calculates topological diagram.Equally, described acquisition module 11 goes back acquisition regularly and the actual reactive power of site.Before receiving new target reactive power, described acquisition module 11 is monitored with the current target reactive power obtained, and performs compensating module 12, to be compensated in real time.
Described compensating module 12 is for according to the difference DELTA q between described actual reactive power and target reactive power, and described actual reactive power and target reactive power fall into lagging reactive power interval respectively or capacitive reactive power is interval, adjust the switching state of at least part of capacitive reactance device in described electric field and/or adjust the reactive power q that the reactive power compensating apparatus in described electric field exports
2.
In one embodiment, described acquisition module 11, by detecting current the exported reactive power of described reactive power compensating apparatus, obtains reactive power compensating apparatus and remains adjustable reactive power q
ad, and transfer to described compensating module 12.When described compensating module 12 determines Δ q < q
adtime, adjust the reactive power q that described reactive power compensating apparatus exports
2, make exported reactive power be q
2+ Δ q.
Such as, described acquisition module 11 detects actual reactive power q
0with target reactive power q
3all fall into lagging reactive power interval or all fall into capacitive reactive power interval, and obtaining q
3-q
0=Δ q.Described acquisition module 11 also detects current the exported reactive power q of described reactive power compensating apparatus
2, and the adjustable reactive power q of current residual is obtained according to the maximum reactive power of output of the described reactive power compensating apparatus obtained in advance
ad.When described compensating module 12 determines Δ q < q
adtime, the adjustable reactive power of residue of each device in described reactive power compensating apparatus can be regulated successively according to the adjustment order preset ,/decline Δ the q until the actual reactive power exported floats.
At this, the interval that described lagging reactive power interval is less than 0 for reactive power; The interval that described capacitive reactive power interval is greater than 0 for reactive power.
In another embodiment, described acquisition module 11, by detecting current the exported reactive power of described reactive power compensating apparatus, obtains reactive power compensating apparatus and remains adjustable reactive power q
ad, and determine Δ q > q at described compensating module 12
adtime, adjust the switching state of at least part of capacitive reactance device in described electric field.
Particularly, when described compensating module 12 determines that obtained actual reactive power and target reactive power all fall into lagging reactive power interval or all fall into capacitive reactive power interval, according to formula
determine throwing state to be transferred to the corresponding capacitance device of the state of cutting or the quantity of reactor, and adjusted by determined quantity m; Wherein, q is the rated reactive power of capacitor or reactor.
Such as, described compensating module 12 determines obtained q
0< 0, q
3< 0 and the Δ q < 0, the down that obtain
l< | Δ q|, then by formula
integer part in result as the quantity of the reactor that will adjust, and transfers the reactor being in the state of cutting to throwing state according to obtained quantity.Now, q can by q
lreplace, q
lfor the reactive power of reactor, down
lfor the maximum inductive reactive power that reactive power compensating apparatus can be lowered.Q
lbe exemplified as the rated reactive power of capacitor.
And for example, described compensating module 12 determines obtained q
0> 0, q
3> 0 and Δ q<0, down of obtaining
c< | Δ q|, then by formula
integer part in result as the quantity of the capacitor that will adjust, and transfers the capacitor being in throwing state to cutting state according to obtained quantity.Now, q can by q
creplace, q
cfor the reactive power value of capacitor, down
cfor the maximum capacitive reactive power that reactive power compensating apparatus can be lowered.Wherein, q
cfor the rated reactive power of capacitor of illustrating.
At this, described compensating module 12, after the switching state of capacitive reactance device having adjusted respective numbers, also may cannot reach target reactive power, then continue to reach target reactive power according to the adjustable reactive power of the residue of reactive power compensating apparatus.
At this, the mode that described compensating module 12 adjusts reactive power compensating apparatus is described aforementioned.Do not repeat them here.
Also have in a kind of mode, when described compensating module 12 determine obtained actual reactive power fall into lagging reactive power interval and target reactive power fall into capacitive reactive power interval time, control all reactors in described electric field and change by the state of throwing the state of cutting into, then obtain the actual reactive power q that in current described electric field, generating equipment exports
1, described reactive power compensating apparatus actual reactive power q
2and described difference DELTA q, and according to formula
determine the capacitors count m that the state of cutting need be transferred to throwing state
c, and by determined quantity m
cadjusted, wherein, q
cfor the reactive power of capacitor.
Such as, when described compensating module 12 determine obtained actual reactive power fall into lagging reactive power interval and target reactive power fall into capacitive reactive power interval time, described compensating module 12 first disconnects all reactors, namely controls all reactors and transfers by the state of throwing the state of cutting to.Obtain the actual reactive power q that in current described electric field, generating equipment exports again
1, described reactive power compensating apparatus actual reactive power q
2and described difference DELTA q, and according to formula
determine the capacitors count m that the state of cutting need be transferred to throwing state
c, and control institute quantification m
ccapacitor transfer throwing state to by the state of cutting.
At this, described compensating module 12 can choose the capacitor of institute's quantification according to device action time order and function, and controls its change oneself state.Also the switching state of the capacitor of institute's quantification can be changed according to the priority preset.
In another kind of mode, when the actual reactive power that described compensating module 12 obtains falls into capacitive reactive power interval and target reactive power falls into lagging reactive power interval, control all capacitors in described electric field and change by the state of throwing the state of cutting into, then obtain the actual reactive power q that in current described electric field, generating equipment exports
1, described reactive power compensating apparatus actual reactive power q
2and described difference DELTA q, and according to formula
determine the reactor quantity m that the state of cutting need be transferred to throwing state
l, and by determined quantity m
ladjusted, wherein, q
lfor the reactive power of reactor.
Such as, when described compensating module 12 determine obtained actual reactive power fall into lagging reactive power interval and target reactive power fall into capacitive reactive power interval time, described compensating module 12 first disconnects all capacitors, namely controls all capacitors and transfers by the state of throwing the state of cutting to.Obtain the actual reactive power q that in current described electric field, generating equipment exports again
1, described reactive power compensating apparatus actual reactive power q
2and described difference DELTA q, and according to formula
determine the reactor quantity m that the state of cutting need be transferred to throwing state
l, and control institute quantification m
lreactor transfer throwing state to by the state of cutting.
At this, described compensating module 12 can the reactor of random selecting institute quantification, and controls its change oneself state.Also the switching state of the reactor of institute's quantification can be changed according to the priority preset.
In more complicated actual conditions, adjust corresponding capacitive reactance device according to calculated quantity, and not necessarily can compensate and the actual reactive power of site accurately, also needs to utilize reactive power compensating apparatus to finely tune.Now, quantity calculated in the manner described above adjusts capacitive reactance device, also needs the residue reactive power considering that reactive power compensating apparatus can regulate, and is that the reactive power of also site compensates so that maximum.For this reason, the described compensating module 12 in the present invention, when the capacitive reactance device quantity obtaining adjusting according to above-mentioned either type, also performs following steps further:
Described compensating module 12 is after the reactor quantity determining wanted transition status or capacitors count, estimate respectively according to determined quantity adjust after and the actual reactive power of site and according to determined quantity add institute after 1 adjust after the actual reactive power of also site, selection is wherein close to target reactive power q
3reactive power, and according to the quantity corresponding to selected reactive power, adjust the switching state of corresponding reactor or capacitor.
Particularly, described compensating module 12 is at the reactor quantity m determining to adjust
lafter, estimate respectively according to quantity m
lthe actual reactive power q of the also site after adjustment
0"=q
0-mq
l-q
1-q
2, and estimate according to quantity (m
l+ 1) the actual reactive power q of the also site after adjustment
0'=q
0-(m+1) q
l+ q
ad'.Wherein, estimating according to quantity (m
l+ 1), during the reactive power that the reactor after adjustment exports, described compensating module 12 also contemplates the reverse regulating power q of reactive power compensating apparatus
ad' (as idle upper timing q
ad' represent that ability lowered by compensation equipment, as idle lower timing q
ad' represent rise ability, the reactive power exported is greater than 0 for capacitive reactive power, and the reactive power exported is less than 0 for lagging reactive power).Select q again
0' and q
0" in closest to target reactive power q
3reactive power, and according to the quantity corresponding to selected reactive power, adjust the switching state of corresponding reactor.
In like manner can obtain, described compensating module 12 is at the capacitors count m determining to adjust
cafter, estimate respectively according to quantity m
cthe actual reactive power q of the also site after adjustment
0"=q
0-mq
c-q
1-q
2, and estimate according to quantity (m
c+ 1) the actual reactive power q of the also site after adjustment
0'=q
0-(m+1) q
c+ q
ad'.Wherein, estimating according to quantity (m
c+ 1), during the reactive power that the capacitor after adjustment exports, described compensating module 12 also contemplates the reverse regulating power q of reactive power compensating apparatus
ad' (as idle upper timing q
ad' represent that ability lowered by compensation equipment, as idle lower timing q
ad' represent rise ability, the reactive power exported is greater than 0 for capacitive reactive power, and the reactive power exported is less than 0 for lagging reactive power).Select q again
0' and q
0" in closest to target reactive power q
3reactive power, and according to the quantity corresponding to selected reactive power, adjust the switching state of corresponding capacitor.
Then, described bucking-out system, after the switching state of adjustment capacitive reactance device, continues the reactive power that adjustment reactive power compensating apparatus exports, to reach described target reactive power q
3.
A kind of limiting case is, in the scheme of above-mentioned each adjustment capacitive reactance device, when described compensating module 12 to adjust the reactor quantity of state or capacitors count be more than or equal to can the corresponding reactor of transition status or capacitors count time, by all institute's energy reactor of transition status or the state of capacitor are changed; The part of described capacitive reactance device deficiency is regulated again according to the adjustable reactive power of the residue of described reactive power compensating apparatus.
Such as, when the difference DELTA q that described compensating module 12 obtains exceeds the scope that capacitive reactance device can adjust, after all capacitive reactance devices adjust according to above-mentioned each scheme by described compensating module 12, the more current actual reactive power q of described reactive power compensating apparatus is obtained
2, and obtain current difference DELTA q', then compensate current difference Δ q' according to the remaining adjustable reactive power of described reactive power compensating apparatus.
In sum, the present invention, by obtaining the switching state topology figure of the capacitive reactance device in electric field, determine the switching state of each capacitive reactance device, be convenient to accurately control the reactive power compensation in electric field, simultaneously, gather the reactive power of actual consumption and the difference of target reactive power, adjust reactive power compensation and/or capacitive reactance device, the change of target reactive power can be responded in time, realize the automatic adjustment of the real-time generating capacity of electric field; In addition, to regulate the switching state of capacitive reactance device as coarse adjustment, the adjustment of reactive power compensating apparatus, as the compound mode of thin tuning, can regulate the reactive power that will compensate fast and accurately; Further, estimate the reactive power after the capacitive reactance device adjustment of adjacent quantity, select wherein closer to the capacitive reactance device quantity of target reactive power, ensure the accuracy rate regulated.So the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (10)
1. a Non Power Compensation Process for electric field, is characterized in that, comprising:
Obtain the throwing state of each capacitive reactance device in electric field and cut the topological diagram of state, and obtaining the actual reactive power q of in described electric field and site
0, and correspondence described in and the target reactive power q of site
3;
According to the difference DELTA q between described actual reactive power and target reactive power, and described actual reactive power and target reactive power fall into lagging reactive power interval respectively or capacitive reactive power is interval, adjust the switching state of at least part of capacitive reactance device in described electric field and/or adjust the reactive power q that the reactive power compensating apparatus in described electric field exports
2.
2. the Non Power Compensation Process of electric field according to claim 1, it is characterized in that, described according to the difference DELTA q between actual reactive power and target reactive power, and described actual reactive power and target reactive power fall into lagging reactive power interval respectively or capacitive reactive power is interval, the switching state adjusting at least part of capacitive reactance device in described electric field and/or the mode adjusting reactive power compensating apparatus described in described electric field comprise following at least one:
When actual reactive power and target reactive power all fall into lagging reactive power interval or all fall into capacitive reactive power interval time, adjust according to described difference DELTA q the reactive power q that described reactive power compensating apparatus exports
2;
When actual reactive power and target reactive power all fall into lagging reactive power interval or all fall into capacitive reactive power interval, according to formula
determine throwing state to be transferred to the corresponding capacitance device of the state of cutting or the quantity of reactor, and adjusted by determined quantity m; Wherein, q is the rated reactive power of capacitor or reactor.
3. the Non Power Compensation Process of electric field according to claim 1, it is characterized in that, described according to the difference DELTA q between actual reactive power and target reactive power, and described actual reactive power and target reactive power fall into lagging reactive power interval respectively or capacitive reactive power is interval, the switching state adjusting at least part of capacitive reactance device in described electric field and/or the mode adjusting reactive power compensating apparatus described in described electric field comprise following any one:
When actual reactive power falls into lagging reactive power interval and target reactive power falls into capacitive reactive power interval, control all reactors in described electric field and change by the state of throwing the state of cutting into, then obtain the actual reactive power q that in current described electric field, generating equipment exports
1, described reactive power compensating apparatus actual reactive power q
2and described difference DELTA q, and according to formula
determine the capacitors count m that the state of cutting need be transferred to throwing state
c, and by determined quantity m
cadjusted, wherein, q
cfor the rated reactive power of capacitor;
When actual reactive power falls into capacitive reactive power interval and target reactive power falls into lagging reactive power interval, control all capacitors in described electric field and change by the state of throwing the state of cutting into, then obtain the actual reactive power q that in current described electric field, generating equipment exports
1, described reactive power compensating apparatus actual reactive power q
2and described difference DELTA q, and according to formula
determine the reactor quantity m that the state of cutting need be transferred to throwing state
l, and by determined quantity m
ladjusted, wherein, q
lfor the rated reactive power of reactor.
4. the Non Power Compensation Process of the electric field according to Claims 2 or 3, is characterized in that, in described adjustment electric field, the mode of the switching state of at least part of capacitive reactance device comprises:
After the reactor quantity determining wanted transition status or capacitors count, estimate respectively according to determined quantity adjust after and the actual reactive power of site and according to determined quantity add institute after 1 adjust after the actual reactive power of also site, selection is wherein close to target reactive power q
3reactive power, and according to the quantity corresponding to selected reactive power, adjust the switching state of corresponding reactor or capacitor.
5. the Non Power Compensation Process of electric field according to claim 1, is characterized in that, in described adjustment electric field, the mode of the switching state of at least part of capacitive reactance device comprises:
When the reactor quantity or capacitors count that will adjust state be more than or equal to can the corresponding reactor of transition status or capacitors count time, by all institute's energy reactor of transition status or the state of capacitor are changed; The part of described capacitive reactance device deficiency is regulated again according to the adjustable reactive power of the residue of described reactive power compensating apparatus.
6. a reactive power compensation system for electric field, is characterized in that, comprising:
Acquisition module, for obtaining the throwing state of each capacitive reactance device in electric field and cutting the topological diagram of state, and obtains the actual reactive power q of in described electric field and site
0, and correspondence described in and the target reactive power q of site
3;
Compensating module, for according to the difference DELTA q between described actual reactive power and target reactive power, and described actual reactive power and target reactive power fall into lagging reactive power interval respectively or capacitive reactive power is interval, adjust the switching state of at least part of capacitive reactance device in described electric field and/or adjust the reactive power q that the reactive power compensating apparatus in described electric field exports
2.
7. the reactive power compensation system of electric field according to claim 6, is characterized in that, described compensating module is used for following at least one:
When actual reactive power and target reactive power all fall into lagging reactive power interval or all fall into capacitive reactive power interval time, adjust according to described difference DELTA q the reactive power q that described reactive power compensating apparatus exports
2;
When actual reactive power and target reactive power all fall into lagging reactive power interval or all fall into capacitive reactive power interval, according to formula
determine throwing state to be transferred to the corresponding capacitance device of the state of cutting or the quantity of reactor, and adjusted by determined quantity m; Wherein, q is the reactive power of capacitor or reactor.
8. the reactive power compensation system of electric field according to claim 6, is characterized in that, described compensating module be used for following any one:
When actual reactive power falls into lagging reactive power interval and target reactive power falls into capacitive reactive power interval, control all reactors in described electric field and change by the state of throwing the state of cutting into, then obtain the actual reactive power q that in current described electric field, generating equipment exports
1, described reactive power compensating apparatus actual reactive power q
2and described difference DELTA q, and according to formula
determine the capacitors count m that the state of cutting need be transferred to throwing state
c, and by determined quantity m
cadjusted, wherein, q
cfor the rated reactive power of capacitor;
When actual reactive power falls into capacitive reactive power interval and target reactive power falls into lagging reactive power interval, control all capacitors in described electric field and change by the state of throwing the state of cutting into, then obtain the actual reactive power q that in current described electric field, generating equipment exports
1, described reactive power compensating apparatus actual reactive power q
2and described difference DELTA q, and according to formula
determine the reactor quantity m that the state of cutting need be transferred to throwing state
l, and by determined quantity m
ladjusted, wherein, q
lfor the rated reactive power of reactor.
9. the reactive power compensation system of the electric field according to claim 7 or 8, it is characterized in that, described compensating module is used for after the reactor quantity determining wanted transition status or capacitors count, estimate respectively according to determined quantity adjust after and the actual reactive power of site and according to determined quantity add institute after 1 adjust after the actual reactive power of also site, selection is wherein close to target reactive power q
3reactive power, and according to the quantity corresponding to selected reactive power, adjust the switching state of corresponding reactor or capacitor.
10. the reactive power compensation system of electric field according to claim 6, it is characterized in that, described compensating module is used for when the reactor quantity or capacitors count that will adjust state are more than or equal to institute's energy corresponding reactor of transition status or capacitors count, whole energy reactor of transition status or the state of capacitor is changed; The part of described capacitive reactance device deficiency is regulated again according to the adjustable reactive power of the residue of described reactive power compensating apparatus.
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