CN103474988B - Emergency control optimization method of electrolytic aluminum self-prepared power grid and based on transient state safety and stability - Google Patents
Emergency control optimization method of electrolytic aluminum self-prepared power grid and based on transient state safety and stability Download PDFInfo
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Abstract
The invention belongs to the technical field of power systems and automation of the power systems, and discloses an emergency control optimization method of an electrolytic aluminum self-prepared power grid and based on transient state safety and stability. According to the method, safety and economy are combined, the method is used for making transient safety and stability control measures of the electrolytic aluminum self-prepared power grid, and reference is provided for safety and stability optimization control of an electrolytic aluminum production power supply system through time domain simulation and control cost function establishment.
Description
Technical field
The invention belongs to Power System and its Automation technical field, be specifically related to a kind of electrolytic aluminium based on transient safe and stable and provide electrical network emergency control optimization method for oneself.
Background technology
In recent years, along with the fast development of economy, the high energy-consuming industries such as electrolytic aluminium are fast-developing.Due to the restriction of the factor such as economy, policy, many enterprise power plants for self-supply power to load.Electrolytic aluminium load belongs to one-level important load, requires high to power supply reliability.The safe and stable operation of electrolytic aluminium electric power system is extremely important.
Electrical network provided for oneself by electrolytic aluminium its outstanding feature, if the complete control method according to bulk power grid of its security and stability control is not preferred plan, even there is more serious potential safety hazard.Electrolytic aluminium load carries out direct current supply by current transformer, and general electrolytic aluminium Rectification Power Factor can leave certain for subsequent use, and namely when the specified operation of Electrolytic Aluminum Series, the average power of every platform Rectification Power Factor can lower than the rated power of separate unit Rectification Power Factor.The regulating power of load side should be taken into full account after fault.But Load Regulation ability is subject to again the constraint of its rectifier system.Electrolytic aluminium rectifier system mainly contains two kinds, i.e. thyristor rectifier and diode rectification.For thyristor rectifier mode, fast response time, adjustable range is wide, and after there is disturbance in net, in extremely rapid succession can carry out load and turn band or pressure load, its governing speed can meet the demand of transient stability security control.But for diode rectification mode, governing speed is comparatively slow, and after there is disturbance in net, its governing speed cannot suppress mains breakdown at all, can only by the mode change of load power discretely of excision Rectification Power Factor after fault occurs.Meanwhile, owing to providing electrical network small scale for oneself, in net, generating set quantity is few, and shared by separate unit generating set, power fraction is larger.Sometimes only take single control measure at Generation Side or load side, be difficult to meet power match requirement, easily caused and cut or owe to cut phenomenon, may need to take generating set and load to jointly control measure.Therefore, provide grid structure and the load character of electrical network for oneself for electrolytic aluminium, the control program that electrical network provided for oneself by the applicable electrolytic aluminium of formulation is very necessary.
And decline due to electrolytic aluminium production capacity or stop the situations such as groove, can bring huge loss, excision generating set also needs to pay very large cost.Under the prerequisite meeting fail safe, the control cost that electrical network provided for oneself by electrolytic aluminium should be reduced as far as possible.
Therefore, need a kind of new technical scheme to solve the problem.
Summary of the invention
Goal of the invention: the problem providing safe operation of electric network and economy in order to solve above-mentioned proposition electrolytic aluminium for oneself, the present invention proposes a kind of electrolytic aluminium based on transient safe and stable and provides electrical network emergency control optimization method for oneself, its object is to: the operational mode providing electrical network according to electrolytic aluminium for oneself, model, parameter and forecast failure, in conjunction with electrolytic aluminium load character, pass through time-domain-simulation, find out all feasible transient stability emergency control schemes, then set up and control cost function accordingly, based on control cost function, optimizing is carried out to feasible control program, find out the transient stability emergency control scheme controlling Least-cost.
Technical scheme: in order to realize foregoing invention object, the invention provides the implementation step that electrical network emergency control optimization method provided for oneself by a kind of electrolytic aluminium based on transient safe and stable:
Step 1: provide power grid construction process, model and parameter for oneself according to electrolytic aluminium, in conjunction with typical operation modes, screening forecast failure collection;
Step 2: according to forecast failure type and net Inner electrolysis aluminium load rectifier system, whether can carry out load after judging this fault and turn band, if can band be turned, then first determine that load turns the power distribution method of band, proceed to next step again, if can not band be turned, directly enter next step.Judgement can carry out load turn band and load turn band power determining method as follows:
(1) judge to carry out the method that load turns band: if the electrolytic aluminium load that there is thyristor rectifier mode provided in electrical network for oneself by the electrolytic aluminium studied, and forecast failure is certain thyristor rectifier mode produces part Rectification Power Factor in series and break down, then first will consider that load turns band, load turns band power distribution method as described in (2).
(2) band power determining method is turned as follows:
1) if
Then
Now the power of fault Rectification Power Factor is all undertaken turning band by retaining (n-m) platform Rectification Power Factor run, and post-fault system does not lose load.
2) if
Then
The power being about to retain in net the every platform unit of (n-m) platform Rectification Power Factor run all is increased to its rated power, in this case owing to being subject to the restriction of Rectification Power Factor self rated power, can only turn a part of power of band, still can there is certain load loss in post-fault system.
Wherein, n is the total number of units of Rectification Power Factor of the Electrolytic Aluminum Series of guilty culprit; M is the Rectification Power Factor number of units broken down; P
nSfor the specified operation gross power of the whole serial electrolytic aluminium of guilty culprit; P
nRfor the rated power of every platform Rectification Power Factor average in the Electrolytic Aluminum Series of guilty culprit; P
rincreasefor retaining (n-m) platform Rectification Power Factor power that average every platform unit increases after load turns band run.
Step 3: time-domain-simulation is carried out to forecast failure, the transient stability after assessment forecast failure, if power system transient stability, then terminates, if Transient Instability, then enters next step;
Step 4: formation can be cut, can be pressed load and the set of Ke Qie generating set, form 3 by the production status (can continue to produce aluminium running status, insulation running status or cooling running status) of residue electrolytic aluminium in net after controlling and can cut by cutting, can press load after fault, press load aggregation, residue in net after fault can be cut generating set and can cut generating set set by the ascending arrangement formation of unit output before fault.Can cut, can press load aggregation and Ke Qie generating set set formation method as follows:
(1) according to the running status of residue electrolytic aluminium in net after excision load, to excising or press the load subtracting power to divide into groups, form three and can cut, can press load aggregation, according to different load types, formation method is as follows:
1) if still there is continuous fast tunable load in net internal loading after fault, the i.e. electrolytic aluminium load of thyristor rectifier mode, then the running status change remaining continuously electrolytic aluminium in net after fast tunable load pressing load is divided into and can continues to produce between aluminium running status, insulation running status and the state of cooling three pressure loading zone, L between the pressure loading zone can continuing to produce aluminium running status
c1: (0, P
c1]; L between the pressure loading zone of insulation running status
c2: (P
c1, P
c2]; L between the pressure loading zone of the state of cooling
c3: (P
c2, P
c3].
Wherein, P
c1during for ensureing that residue load power can maintain electrolytic aluminium continuation production aluminium, the maximum continuous fast tunable load power subtracted can be pressed; P
c2during for ensureing that residue load power can make electrolytic aluminium be incubated but not produce aluminium, the maximum continuous fast tunable load power subtracted can be pressed; P
c3for ensureing that living load continues to run, when electrolytic aluminium enters the state of cooling, the maximum continuous fast tunable load power subtracted can be pressed.
2) if there is discontinuous fast tunable load in net internal loading after fault, namely the electrolytic aluminium load of diode rectification mode is adopted, then by retain the discontinuous fast tunable load that runs by remain after excision Rectification Power Factor load state variation be divided into can continue to produce aluminium running status, insulation running status and the state of cooling three can cutting load group, that can continue to produce aluminium running status can cutting load group L
uc1: { P
uc11, P
uc12... P
uc1i; Insulation running status can cutting load group L
uc2: { P
uc21, P
uc22... P
uc2j; The state of cooling can cutting load group L
uc3: { P
uc31, P
uc32... P
uc3k.
Wherein, i, j, k are respectively element number in three combinations; P
uc1r(r=1,2 ..., i) be one group of centrifugal pump, each element all corresponding one maintain that electrolytic aluminium can continue under production run state can cutting load watt level; P
uc1s(s=1,2 ..., j) be one group of centrifugal pump, all corresponding load power size can cut under maintaining electrolytic aluminium keeping warm mode of each element; P
uc1t(t=1,2 ..., k) be one group of centrifugal pump, all corresponding electrolytic aluminium of each element enter the state of cooling but ensure net internally-powered load normal power supply can cutting load watt level.
According to 1) and 2) can obtain between continuous fast tunable load pressure loading zone and discontinuous fast tunable load cutting load group.When net internal loading after fault only has continuous fast tunable load, described to cut, load aggregation can be pressed to be 1) in three deferrable load intervals being formed; When net internal loading after fault only has non-rapid continuously adjustabe load, described to cut, load aggregation can be pressed to be 2) in formed three can cutting load group; When fast tunable load continuous in net internal loading after fault and discontinuous fast tunable load all exist, described to cut, can press between loading zone be 1) in three deferrable loads being formed interval and 2) in three of formation can the corresponding union of cutting load group.
(2) by net after fault, remaining generating set of cutting is by its ascending arrangement of exerting oneself, and formation can cut generating set set.
Step 5: determining can control means priority, and to cutting, can press load and Ke Qie generating set combines, pass through time-domain-simulation, find out and allly meet the cutting of transient stability requirement, press load, cut machine or load and generating set and jointly control scheme, form the set of Transient Stability Control feasible program.Feasible Transient Stability Control scheme searching method is as follows:
(1) the unbalanced power amount △ P=P after calculating forecast failure in electrical network
g-P
l, consider in calculating load turn band after impact.
Wherein △ P is that after fault, net internal power is not weighed instantaneously, P
gfor netting interior generator gross capability instantaneously after fault, P
lfor net internal loading power instantaneously after fault.
(2) based on the size of unbalanced power amount, tentatively determine the control program taked, comprise and cut machine scheme and cut, press load scheme.
(3) determining can control means priority.To cutting, can press in the search procedure of load aggregation, priority orders is as follows: can continue to produce aluminium running status collection > keeping warm mode collection > state of cooling collection.Search for from the set that priority is high, if in high the cutting, load aggregation can be pressed or feasible control program can be looked in it is with the combination can cutting generating set of priority, then only in this priority loads set, search for all feasible programs, the load aggregation no longer entering next priority is searched for; Otherwise search for the cutting of lower priority after the same method, can load aggregation be pressed.
Because local provides operation of power networks generating set limited amount for oneself, generating set not assigned priority can be cut, in control program search, consider all control programs of different Unit Combination.
(4) ask for all control programs that can meet electricity net safety stable requirement after fault by time-domain-simulation iteration, form feasible control program set:
1) cut machine or cut, press the single control program of load, based on the priority of generating set or controllable burden, asking for all feasible single combined measure control programs by time-domain-simulation iteration;
2) cut machine and cut, press load to jointly control scheme, consider the machine of cutting and cut, press spatial load forecasting after the power-balance of electrical network and transient stability requirement, carry out cutting machine and cut, press combination optimizing between load, searching for all feasible control programs.This scheme is particularly suitable for cutting machine in employing or cutting, press the single control measure of load to be difficult to search out the situation of feasible solution.
Step 6: set up according to continuous fast tunable Load Regulation cost, discontinuous fast tunable load excision cost and generating set excision cost and control cost function.Control cost computational methods as follows:
(1) spatial load forecasting cost
1) continuous fast tunable Load Regulation cost
Continuous fast tunable Load Regulation cost comprises continuous fast tunable load and turns band cost, pressure load cost and keep the deferrable load run after trouble shooting, come back to the Readjusting cost of specified running status.
A) load turns band cost:
C
L-transfer-total＝P
L-transfer*C
L-transfer
Wherein, C
l-transfer-totalfor continuous fast tunable load turns total cost of band; P
l-transferfor turning the load power of band; C
l-transferfor mean unit power load turns the adjustment expense needed for band.
B) load cost is pressed:
C
L-reduce-total＝(P
L-reduce*C
L-produce*T
L-reduce)+(P
L-state1*(1-η)*C
L-produce*T
L-state1)+(P
L-reduce*C
L-reduce)
Wherein, C
l-reduce-totalfor pressing total cost of load; P
l-reducefor pressure load power; C
l-producefor the Production Gain value of the corresponding electrolytic aluminium of average power; T
l-reducefor the under-capacity operation time; P
l-state1for remaining load power that in continuous fast tunable load, running status changes (remaining load production efficiency in the net namely caused due to pressure load decline or make load enter the part load power of keeping warm mode or the state of cooling) after pressure load; η is the production efficiency remaining load after pressure load; T
l-state1for the running time after continuous fast tunable changing load state; C
l-reducefor pressing the Readjusting cost subtracted needed for unit power load.
C) keep the continuous fast tunable load run after trouble shooting, come back to the Readjusting cost of specified running status:
C
L-reduction＝P
R-L-reduction*C
L-reduction*(n-m)
Wherein, C
l-reductionafter trouble shooting, the total cost of adjustment of specified running status is come back to for retaining the deferrable load run; P
r-L-reductionwhen Rectification Power Factor for reservation operation will get back to specified running status, average every platform unit needs the power of adjustment; C
l-reductionfor the Readjusting cost of Rectification Power Factor mean unit power.
2) discontinuous fast tunable load excision cost
C
L-cut-total＝(P
L-cut*C
L-produce*T
L-cut)+(P
L-state2*(1-η)*C
L-produce*T
L-state2)+C
L-cut-restart
Wherein, C
l-cut-totalfor discontinuous fast tunable load excises total cost; P
l-cutfor cut electrolytic aluminium load power; C
l-producewith described meaning is identical before, i.e. the corresponding Aluminum Electrolysis Production financial value of average power; T
l-cutfor the idle time of cut load; P
l-state2for continuing to keep in the load of operation after excision load, the load power (namely decline owing to causing netting interior residue load production efficiency after cut-out load or make load enter the part load power of keeping warm mode or the state of cooling) that discontinuous fast tunable load production status changes; η is the production efficiency remaining load after cutting load; T
l-state2for the running time after discontinuous fast tunable changing load state; C
l-cut-restartcost is restarted for Rectification Power Factor cut after fault.
(2) generator set control cost is cut
C
G-cut-total＝(P
G-cut*C
G-cut*T
G-cut)+C
G-restart
C
g-cut-totaltotal cost is controlled for cutting machine; P
g-cutfor the generating set power of excising after fault, C
g-cutfor generator mean unit electric energy cuts machine loss, T
g-cutfor the idle time of cut generating set; C
g-restartcost is restarted for cut generating set.
(3) total cost is controlled
C
total＝C
L-transfer-total+C
L-reduce-total+C
L-reduction+C
L-cut-total+C
G-cut-total
Wherein, C
totalfor the total cost of transient stability emergency control.
Step 7: in feasible program set, carries out optimizing to control cost function, finds the feasible program controlling Least-cost, as the optimal control policy occurred under which after this fault.
Relative to prior art, the invention provides a kind of electrolytic aluminium based on transient safe and stable and provide electrical network emergency control optimization method for oneself, and give implementation step.Be characterized in the feature taking into full account electrolytic aluminium load, in conjunction with time-domain-simulation, formulate corresponding transient stability emergency control scheme, control cost can be minimized simultaneously, under the prerequisite meeting fail safe, realize economical operation.
Accompanying drawing explanation
Fig. 1 is the implementing procedure figure that electrical network emergency control optimization method provided for oneself by a kind of electrolytic aluminium based on transient safe and stable.
Embodiment
Below in conjunction with the drawings and specific embodiments, illustrate the present invention further, these embodiments should be understood only be not used in for illustration of the present invention and limit the scope of the invention, after having read the present invention, the amendment of those skilled in the art to the various equivalent form of value of the present invention has all fallen within the application's claims limited range.
As shown in Figure 1, that provide is the implementing procedure figure that electrical network emergency control optimization method provided for oneself by a kind of electrolytic aluminium based on transient safe and stable.
What in Fig. 1, step 1 described is provide power grid construction process, model and parameter for oneself according to electrolytic aluminium, in conjunction with typical operation modes, and screening forecast failure collection.
What in Fig. 1, step 2 described is according to forecast failure type and net Inner electrolysis aluminium load rectifier system, whether can carry out load after judging this fault and turn band, if can band be turned, then first determine that load turns the power distribution method of band, proceed to next step again, if can not band be turned, directly enter next step.Judgement can carry out load turn band and load turn band power determining method as follows:
(1) judge to carry out the method that load turns band: if the electrolytic aluminium load that there is thyristor rectifier mode provided in electrical network for oneself by the electrolytic aluminium studied, and forecast failure is certain thyristor rectifier mode produces part Rectification Power Factor in series and break down, then first will consider that load turns band, load turns band power distribution method as described in (2).
(2) band power determining method is turned as follows:
1) if
Then
Now the power of fault Rectification Power Factor is all undertaken turning band by retaining (n-m) platform Rectification Power Factor run, and post-fault system does not lose load.
2) if
Then
The power being about to retain in net the every platform unit of (n-m) platform Rectification Power Factor run all is increased to its rated power, in this case owing to being subject to the restriction of Rectification Power Factor self rated power, can only turn a part of power of band, still can there is certain load loss in post-fault system.
Wherein, n is the total number of units of Rectification Power Factor of the Electrolytic Aluminum Series of guilty culprit; M is the Rectification Power Factor number of units broken down; P
nSfor the specified operation gross power of the whole serial electrolytic aluminium of guilty culprit; P
nRfor the rated power of every platform Rectification Power Factor average in the Electrolytic Aluminum Series of guilty culprit; P
rincreasefor retaining (n-m) platform Rectification Power Factor power that average every platform unit increases after load turns band run.
What in Fig. 1, step 3 described is carry out time-domain-simulation to forecast failure, and the transient stability after assessment forecast failure, if power system transient stability, then terminates, if Transient Instability, then enter next step.
What in Fig. 1, step 4 described is the formation method of determining can cut, can press load and the set of Ke Qie generating set.Form 3 by the production status (can continue to produce aluminium running status, insulation running status or cooling running status) of residue electrolytic aluminium in net after controlling and can cut cutting, can press load after fault, press load aggregation, residue in net after fault can be cut generating set and can cut generating set set by the ascending arrangement formation of unit output before fault.Can cut, can press load aggregation and Ke Qie generating set set formation method as follows:
(1) according to the running status of residue electrolytic aluminium in net after excision load, to excising or press the load subtracting power to divide into groups, form three and can cut, can press load aggregation, according to different load types, formation method is as follows:
1) if still there is continuous fast tunable load in net internal loading after fault, the i.e. electrolytic aluminium load of thyristor rectifier mode, then the running status change remaining continuously electrolytic aluminium in net after fast tunable load pressing load is divided into and can continues to produce between aluminium running status, insulation running status and the state of cooling three pressure loading zone, L between the pressure loading zone can continuing to produce aluminium running status
c1: (0, P
c1]; L between the pressure loading zone of insulation running status
c2: (P
c1, P
c2]; L between the pressure loading zone of the state of cooling
c3: (P
c2, P
c3].
Wherein, P
c1during for ensureing that residue load power can maintain electrolytic aluminium continuation production aluminium, the maximum continuous fast tunable load power subtracted can be pressed; P
c2during for ensureing that residue load power can make electrolytic aluminium be incubated but not produce aluminium, the maximum continuous fast tunable load power subtracted can be pressed; P
c3for ensureing that living load continues to run, when electrolytic aluminium enters the state of cooling, the maximum continuous fast tunable load power subtracted can be pressed.
2) if there is discontinuous fast tunable load in net internal loading after fault, namely the electrolytic aluminium load of diode rectification mode is adopted, then by retain the discontinuous fast tunable load that runs by remain after excision Rectification Power Factor load state variation be divided into can continue to produce aluminium running status, insulation running status and the state of cooling three can cutting load group, that can continue to produce aluminium running status can cutting load group L
uc1: { P
uc11, P
uc12... P
uc1i; Insulation running status can cutting load group L
uc2: { P
uc21, P
uc22... P
uc2j; The state of cooling can cutting load group L
uc3: { P
uc31, P
uc32... P
uc3k.
Wherein, i, j, k are respectively element number in three combinations; P
uc1r(r=1,2 ..., i) be one group of centrifugal pump, each element all corresponding one maintain that electrolytic aluminium can continue under production run state can cutting load watt level; P
uc1s(s=1,2 ..., j) be one group of centrifugal pump, all corresponding load power size can cut under maintaining electrolytic aluminium keeping warm mode of each element; P
uc1t(t=1,2 ..., k) be one group of centrifugal pump, all corresponding electrolytic aluminium of each element enter the state of cooling but ensure net internally-powered load normal power supply can cutting load watt level.
According to 1) and 2) can obtain between continuous fast tunable load pressure loading zone and discontinuous fast tunable load cutting load group.When net internal loading after fault only has continuous fast tunable load, described to cut, load aggregation can be pressed to be 1) in three deferrable load intervals being formed; When net internal loading after fault only has non-rapid continuously adjustabe load, described to cut, load aggregation can be pressed to be 2) in formed three can cutting load group; When fast tunable load continuous in net internal loading after fault and discontinuous fast tunable load all exist, described to cut, can press between loading zone be 1) in three deferrable loads being formed interval and 2) in three of formation can the corresponding union of cutting load group.
(2) by net after fault, remaining generating set of cutting is by its ascending arrangement of exerting oneself, and formation can cut generating set set.
What in Fig. 1, step 5 described is the method forming feasible program set.By determine can control means priority, and carry out feasible control program search in conjunction with time-domain-simulation, form feasible control program set, namely to cutting, can press load and Ke Qie generating set combines, pass through time-domain-simulation, find out and allly meet the cutting of transient stability requirement, press load, cut machine or load and generating set and jointly control scheme, form the set of Transient Stability Control feasible program.Concrete feasible Transient Stability Control scheme searching method is as follows:
(1) the unbalanced power amount △ P=P after calculating forecast failure in electrical network
g-P
l, consider in calculating load turn band after impact.
Wherein △ P is that after fault, net internal power is not weighed instantaneously, P
gfor netting interior generator gross capability instantaneously after fault, P
lfor net internal loading power instantaneously after fault.
(2) based on the size of unbalanced power amount, tentatively determine the control program taked, comprise and cut machine scheme and cut, press load scheme.
(3) determining can control means priority.To cutting, can press in the search procedure of load aggregation, priority orders is as follows: can continue to produce aluminium running status collection > keeping warm mode collection > state of cooling collection.Search for from the set that priority is high, if in high the cutting, load aggregation can be pressed or feasible control program can be looked in it is with the combination can cutting unit of priority, then only in this priority loads set, search for all feasible programs, the load aggregation no longer entering next priority is searched for; Otherwise search for the cutting of lower priority after the same method, can load aggregation be pressed.
Because local provides operation of power networks generating set limited amount for oneself, generating set not assigned priority can be cut, in control program search, consider all control programs that different generating set combines.
(4) ask for all control programs that can meet electricity net safety stable requirement after fault by time-domain-simulation iteration, form feasible control program set.
1) cut machine or cut, press the single control program of load, based on the priority of generating set or controllable burden, asking for all feasible single combined measure control programs by time-domain-simulation iteration;
2) cut machine and cut, press load to jointly control scheme, consider the machine of cutting and cut, press spatial load forecasting after the power-balance of electrical network and transient stability requirement, carry out cutting machine and cut, press combination optimizing between load, searching for all feasible control programs.This scheme is particularly suitable for cutting machine in employing or cutting, press the single control measure of load to be difficult to search out the situation of feasible solution.
What in Fig. 1, step 6 described is the method determining to control cost.Set up according to deferrable load Readjusting cost, non-deferrable load excision cost and generating set excision cost and control cost function.Concrete control cost computational methods are as follows:
(1) spatial load forecasting cost
1) continuous fast tunable Load Regulation cost
Continuous fast tunable Load Regulation cost comprises continuous fast tunable load and turns band cost, pressure load cost and keep the deferrable load run after trouble shooting, come back to the Readjusting cost of specified running status.
A) load turns band cost:
C
L-transfer-total＝P
L-transfer*C
L-transfer
Wherein, C
l-transfer-totalfor continuous fast tunable load turns total cost of band; P
l-transferfor turning the load power of band; C
l-transferfor mean unit power load turns the adjustment expense needed for band.
B) load cost is pressed:
C
L-reduce-total＝(P
L-reduce*C
L-produce*T
L-reduce)+(P
L-state1*(1-η)*C
L-produce*T
L-state1)+(P
L-reduce*C
L-reduce)
Wherein, C
l-reduce-totalfor pressing total cost of load; P
l-reducefor pressure load power; C
l-producefor the Production Gain value of the corresponding electrolytic aluminium of average power; T
l-reducefor the under-capacity operation time; P
l-state1for remaining load power that in continuous fast tunable load, running status changes (remaining load production efficiency in the net namely caused due to pressure load decline or make load enter the part load power of keeping warm mode or the state of cooling) after pressure load; η is the production efficiency remaining load after pressure load; T
l-state1for the running time after continuous fast tunable changing load state; C
l-reducefor pressing the Readjusting cost subtracted needed for unit power load.
C) keep the continuous fast tunable load run after trouble shooting, come back to the Readjusting cost of specified running status:
C
L-reduction＝P
R-L-reduction*C
L-reduction*(n-m)
Wherein, C
l-reductionafter trouble shooting, the total cost of adjustment of specified running status is come back to for retaining the deferrable load run; P
r-L-reductionwhen Rectification Power Factor for reservation operation will get back to specified running status, average every platform unit needs the power of adjustment; C
l-reductionfor the Readjusting cost of Rectification Power Factor mean unit power.
2) discontinuous fast tunable load excision cost
C
L-cut-total＝(P
L-cut*C
L-produce*T
L-cut)+(P
L-state2*(1-η)*C
L-produce*T
L-state2)+C
L-cut-restart
Wherein, C
l-cut-totalfor discontinuous fast tunable load excises total cost; P
l-cutfor cut electrolytic aluminium load power; C
l-producewith described meaning is identical before, i.e. the Production Gain value of the corresponding electrolytic aluminium of mean unit power; T
l-cutfor the idle time of cut load; P
l-state2for continuing to keep in the load of operation after excision load, the load power (namely decline owing to causing netting interior residue load production efficiency after cut-out load or make load enter the part load power of keeping warm mode or the state of cooling) that discontinuous fast tunable load production status changes; η is the production efficiency remaining load after cutting load; T
l-state2for the running time after discontinuous fast tunable changing load state; C
l-cut-restartcost is restarted for Rectification Power Factor cut after fault.
(2) generator set control cost is cut
C
G-cut-total＝(P
G-cut*C
G-cut*T
G-cut)+C
G-restart
C
g-cut-totaltotal cost is controlled for cutting machine; P
g-cutfor the generating set power of excising after fault, C
g-cutfor generator mean unit electric energy cuts machine loss, T
g-cutfor the idle time of cut generating set; C
g-restartcost is restarted for cut generating set.
(3) total cost is controlled
C
total＝C
L-transfer-total+C
L-reduce-total+C
L-reduction+C
L-cut-total+C
G-cut-total
Wherein, C
totalfor the total cost of transient stability emergency control.
What in Fig. 1, step 7 described is in feasible program set, carries out optimizing, find the feasible program controlling Least-cost, as the optimal control policy occurred under which after this fault to control cost function.
In sum, the present invention is that electrical network emergency control optimization method provided for oneself by a kind of electrolytic aluminium based on transient safe and stable.Provide power system operating mode and model parameter for oneself according to electrolytic aluminium, for different load rectifier systems, carry out time-domain-simulation in conjunction with typical operation modes and forecast failure, find out all feasible transient stability emergency control schemes.Set up according to continuous fast tunable Load Regulation cost, discontinuous fast tunable load excision cost and generating set excision cost again and control cost function, according to control cost function, optimizing is carried out to feasible program set, finds out the control program of Least-cost.Contemplated by the invention a kind of electrolytic aluminium based on transient safe and stable and provide electrical network emergency control optimization method for oneself, establish control cost function, optimize the transient stability emergency control method that electrical network provided for oneself by electrolytic aluminium, for its safety, economical operation provide support.
Claims (5)
1. an electrical network emergency control optimization method provided for oneself by the electrolytic aluminium based on transient safe and stable, it is characterized in that: described emergency control optimization method comprises the following steps:
Step 1: provide power grid construction process, model and parameter for oneself according to electrolytic aluminium, screening forecast failure collection;
Step 2: according to forecast failure type and net Inner electrolysis aluminium load rectifier system, whether can carry out load after judging this fault and turn band, if can band be turned, then first determine that load turns the power distribution method of band, proceed to next step again, if can not band be turned, directly enter next step;
Step 3: time-domain-simulation is carried out to forecast failure, the transient stability after assessment forecast failure, if power system transient stability, then terminates, if Transient Instability, then enters next step;
Step 4: formation can be cut, can be pressed load and the set of Ke Qie generating set, form 3 by the production status of residue electrolytic aluminium in net after controlling and can cut by cutting, can press load after fault, press load aggregation, residue in net after fault can be cut generating set and can cut generating set set by the ascending arrangement formation of unit output before fault;
Step 5: determining can control means priority, and to cutting, can press load and Ke Qie generating set combines, pass through time-domain-simulation, find out and allly meet the cutting of transient stability requirement, press load, cut machine or load and generating set and jointly control scheme, form the set of Transient Stability Control feasible program;
Step 6: according to can continuously quick adjustment Load Regulation cost, non-can continuously quick adjustment load excision cost and generating set excision cost set up control cost function;
Step 7: in feasible program set, carries out optimizing to control cost function, finds the feasible program controlling Least-cost, as the optimal control policy occurred under which after this fault.
2. electrical network emergency control optimization method provided for oneself by a kind of electrolytic aluminium based on transient safe and stable according to claim 1, it is characterized in that: can described step 2 judge to carry out load and turn band and load to turn band power determining method as follows:
(1) judge to carry out the method that load turns band: if the electrolytic aluminium load that there is thyristor rectifier mode provided in electrical network for oneself by the electrolytic aluminium studied, and forecast failure is certain thyristor rectifier mode produces part Rectification Power Factor in series and break down, then first will consider that load turns band, load turns band power distribution method as described in (2);
(2) band power determining method is turned as follows:
1) if
Then
Now the power of fault Rectification Power Factor is all undertaken turning band by retaining (n-m) platform Rectification Power Factor run, and post-fault system does not lose load;
2) if
then
the power being about to retain in net the every platform unit of (n-m) platform Rectification Power Factor run all is increased to its rated power, in this case owing to being subject to the restriction of Rectification Power Factor self rated power, can only turn a part of power of band, still can there is certain load loss in post-fault system;
Wherein, n is the total number of units of Rectification Power Factor of the Electrolytic Aluminum Series of guilty culprit; M is the Rectification Power Factor number of units broken down; P
nSfor the specified operation gross power of the whole serial electrolytic aluminium of guilty culprit; P
nRfor the rated power of every platform Rectification Power Factor average in the Electrolytic Aluminum Series of guilty culprit; P
rincreasefor retaining (n-m) platform Rectification Power Factor power that average every platform unit increases after load turns band run.
3. electrical network emergency control optimization method provided for oneself by a kind of electrolytic aluminium based on transient safe and stable according to claim 1, it is characterized in that: described step 4 can be cut, can press load aggregation and Ke Qie generating set set formation method as follows:
(1) according to the running status of residue electrolytic aluminium in net after excision load, to excising or press the load subtracting power to divide into groups, form three and can cut, can press load aggregation, according to different load types, formation method is as follows:
1) if still there is continuous fast tunable load in net internal loading after fault, the i.e. electrolytic aluminium load of thyristor rectifier mode, then the running status change remaining continuously electrolytic aluminium in net after fast tunable load pressing load is divided into and can continues to produce between aluminium running status, insulation running status and the state of cooling three pressure loading zone, L between the pressure loading zone can continuing to produce aluminium running status
c1: (0, P
c1]; L between the pressure loading zone of insulation running status
c2: (P
c1, P
c2]; L between the pressure loading zone of the state of cooling
c3: (P
c2, P
c3];
Wherein, P
c1during for ensureing that residue load power can maintain electrolytic aluminium continuation production aluminium, the maximum continuous fast tunable load power subtracted can be pressed; P
c2during for ensureing that residue load power can make electrolytic aluminium be incubated but not produce aluminium, the maximum continuous fast tunable load power subtracted can be pressed; P
c3for ensureing that living load continues to run, when electrolytic aluminium enters the state of cooling, the maximum continuous fast tunable load power subtracted can be pressed;
2) if there is discontinuous fast tunable load in net internal loading after fault, namely the electrolytic aluminium load of diode rectification mode is adopted, then by retain the discontinuous fast tunable load that runs by remain after excision Rectification Power Factor load state variation be divided into can continue to produce aluminium running status, insulation running status and the state of cooling three can cutting load group, that can continue to produce aluminium running status can cutting load group L
uc1: { P
uc11, P
uc12... P
uc1i; Insulation running status can cutting load group L
uc2: { P
uc21, P
uc22... P
uc2j; The state of cooling can cutting load group L
uc3: { P
uc31, P
uc32... P
uc3k;
Wherein, i, j, k be respectively three can element number in cutting load group; P
uc1r(r=1,2 ..., i) be one group of centrifugal pump, each element all corresponding one maintain that electrolytic aluminium can continue under production run state can cutting load watt level; P
uc1s(s=1,2 ..., j) be one group of centrifugal pump, all corresponding load power size can cut under maintaining electrolytic aluminium keeping warm mode of each element; P
uc1t(t=1,2 ..., k) be one group of centrifugal pump, all corresponding electrolytic aluminium of each element enter the state of cooling but ensure net internally-powered load normal power supply can cutting load watt level;
According to 1) and 2) can obtain between continuous fast tunable load pressure loading zone and discontinuous fast tunable load cutting load group; When net internal loading after fault only has continuous fast tunable load, described to cut, load aggregation can be pressed to be 1) in three deferrable load intervals being formed; When net internal loading after fault only has non-rapid continuously adjustabe load, described to cut, load aggregation can be pressed to be 2) in formed three can cutting load group; When fast tunable load continuous in net internal loading after fault and discontinuous fast tunable load all exist, described to cut, can press between loading zone be 1) in three deferrable loads being formed interval and 2) in three of formation can the corresponding union of cutting load group;
(2) by net after fault, remaining generating set of cutting is by its ascending arrangement of exerting oneself, and formation can cut generating set set.
4. electrical network emergency control optimization method provided for oneself by a kind of electrolytic aluminium based on transient safe and stable according to claim 1, it is characterized in that: it is as follows that described step 5 comprises feasible Transient Stability Control scheme searching method:
(1) the unbalanced power amount Δ P=P after calculating forecast failure in electrical network
g-P
l, consider in calculating load turn band after impact;
Wherein Δ P is that after fault, net internal power is not weighed instantaneously, P
gfor netting interior generator gross capability instantaneously after fault, P
lfor net internal loading gross power instantaneously after fault;
(2) based on the size of unbalanced power amount, tentatively determine the control program taked, comprise and cut machine scheme and cut, press load scheme;
(3) determining can control means priority;
To cutting, can press in the search procedure of load aggregation, priority orders is as follows: can continue to produce aluminium running status collection > keeping warm mode collection > state of cooling collection; Search for from the set that priority is high, if in high the cutting, load aggregation can be pressed or feasible control program can be looked in it is with the combination can cutting generating set of priority, then only in this priority loads set, search for all feasible programs, the load aggregation no longer entering next priority is searched for; Otherwise search for the cutting of lower priority after the same method, can load aggregation be pressed;
Because local provides operation of power networks generating set limited amount for oneself, generating set not assigned priority can be cut, in control program search, consider all control programs that different generating set combines;
(4) ask for all control programs that can meet electricity net safety stable requirement after fault by time-domain-simulation iteration, form feasible control program set:
1) cut machine or cut, press the single control program of load, based on the priority of generating set or controllable burden, asking for all feasible single combined measure control programs by time-domain-simulation iteration;
2) cut machine and cut, press load to jointly control scheme, consider the machine of cutting and cut, press spatial load forecasting after the power-balance of electrical network and transient stability requirement, carry out cutting machine and cut, press combination optimizing between load, searching for all feasible control programs; This scheme is adapted at adopting the machine of cutting or cuts, presses the single control measure of load to be difficult to search out the situation of feasible solution.
5. electrical network emergency control optimization method provided for oneself by a kind of electrolytic aluminium based on transient safe and stable according to claim 2, it is characterized in that: control cost computational methods in described step 6 as follows:
(1) spatial load forecasting cost
1) continuous fast tunable Load Regulation cost
Continuous fast tunable Load Regulation cost comprises continuous fast tunable load and turns band cost, pressure load cost and keep the deferrable load run after trouble shooting, come back to the Readjusting cost of specified running status;
A) load turns band cost:
C
L-transfer-total＝P
L-transfer*C
L-transfer
Wherein, C
l-transfer-totalfor continuous fast tunable load turns total cost of band; P
l-transferfor turning the load power of band; C
l-transferfor mean unit power load turns the adjustment expense needed for band;
B) load cost is pressed:
C
L-reduce-total＝(P
L-reduce*C
L-produce*T
L-reduce)+(P
L-state1*(1-η)*C
L-produce*T
L-state1)+(P
L-reduce*C
L-reduce)
Wherein, C
l-reduce-totalfor pressing total cost of load; P
l-reducefor pressure load power; C
l-producefor the Production Gain value of the corresponding electrolytic aluminium of mean unit power; T
l-reducefor the under-capacity operation time; P
l-state1for remaining the load power that in continuous fast tunable load, running status changes after pressure load; η is the production efficiency remaining load after pressure load; T
l-state1for the running time after continuous fast tunable changing load state; C
l-reducefor pressing the Readjusting cost subtracted needed for unit power load;
C) keep the continuous fast tunable load run after trouble shooting, come back to the Readjusting cost of specified running status:
C
L-reduction＝P
R-L-reduction*C
L-reduction*(n-m)
Wherein, C
l-reductionafter trouble shooting, the total cost of adjustment of specified running status is come back to for retaining the deferrable load run; P
r-L-reductionwhen Rectification Power Factor for reservation operation will get back to specified running status, average every platform unit needs the power of adjustment; C
l-reductionfor the Readjusting cost of Rectification Power Factor mean unit power;
2) discontinuous fast tunable load excision cost
C
L-cut-total＝(P
L-cut*C
L-produce*T
L-cut)+(P
L-state2*(1-η)*C
L-produce*T
L-state2)+C
L-cut-restart
Wherein, C
l-cut-totalfor discontinuous fast tunable load excises total cost; P
l-cutfor cut electrolytic aluminium load power; C
l-producewith described meaning is identical before, i.e. the Production Gain value of the corresponding electrolytic aluminium of mean unit power; T
l-cutfor the idle time of cut load; P
l-state2keep in the load of operation for continuing after excision load, the load power that discontinuous fast tunable load production status changes, namely declines owing to causing netting interior residue load production efficiency after cut-out load or makes load enter the part load power of keeping warm mode or the state of cooling; η is the production efficiency remaining load after cut-out load; T
l-state2for the running time after discontinuous fast tunable changing load state; C
l-cut-restartcost is restarted for Rectification Power Factor cut after fault;
(2) generator set control cost is cut
C
G-cut-total＝(P
G-cut*C
G-cut*T
G-cut)+C
G-restart
C
g-cut-totaltotal cost is controlled for cutting machine; P
g-cutfor the generating set power of excising after fault, C
g-cutfor generator mean unit electric energy cuts machine loss, T
g-cutfor the idle time of cut generating set; C
g-restartcost is restarted for cut generating set;
(3) total cost is controlled
C
total＝C
L-transfer-total+C
L-reduce-total+C
L-reduction+C
L-cut-total+C
G-cut-total
Wherein, C
totalfor the total cost of transient stability emergency control.
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| CN104795816B (en) * | 2015-04-29 | 2017-01-11 | 南京南瑞继保电气有限公司 | Load shedding method based on importance of loads |
| CN107482615B (en) * | 2017-04-06 | 2020-08-11 | 国电南瑞科技股份有限公司 | Control method for high-energy-carrying enterprise power grid after load loss is taken into consideration |
| CN107516904B (en) * | 2017-08-31 | 2020-05-15 | 国电南瑞科技股份有限公司 | Accurate load control method for coping with power supply off-line impact and considering unit adjusting capacity |
| CN108808688B (en) * | 2018-07-04 | 2021-07-02 | 云南电网有限责任公司 | Stable control load shedding method based on electrolytic aluminum control characteristics |
| CN109066726B (en) * | 2018-08-07 | 2021-07-13 | 国电南瑞科技股份有限公司 | Frequency safety emergency coordination optimization control method integrating multiple measures |
| CN110829445B (en) * | 2019-10-18 | 2023-03-24 | 酒泉钢铁(集团)有限责任公司 | Load shedding control method for power supply system of electrolytic aluminum production line |
| CN110912202A (en) * | 2019-11-13 | 2020-03-24 | 酒泉钢铁(集团)有限责任公司 | Safety and stability control method applied to independent power grid |
| CN111341389B (en) * | 2020-03-27 | 2023-03-31 | 国网山东省电力公司电力科学研究院 | Electrolytic aluminum load electric heating characteristic modeling method for direct load control |
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