CN109713670A - Fault recovery based on three port flexibility multimodes switch controls optimization method - Google Patents
Fault recovery based on three port flexibility multimodes switch controls optimization method Download PDFInfo
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Abstract
The invention discloses a kind of fault recoveries based on three port flexibility multimodes switch to control optimization method, according to system parameter, feeder line load balancing factor maximum minimum with power loss region load power loss amount and the minimum target of via net loss establish each single-goal function, establish multi-goal optimizing function using each objective function normalized value and each target weight vector；It is not powered off with feeder line power-balance, the operation of three port flexibility multimodes switch, three port flexibility multimodes switch maximum capacity and important load as constraint condition, three port flexibility multimode switch load service restoration Optimum Regulation models is made of multi-goal optimizing function and constraint condition；Solving model obtains normal and net side optimal power supply value in three ports, using optimal power supply value as the active power reference value of power control, realize the optimization of fault recovery control, the present invention can be realized power distribution network important load uninterrupted power supply, improve feeder line equilibrium degree and power supply reliability.
Description
Technical field
The present invention relates to fault recoveries in power distribution network to control optimization method, more particularly to is opened based on three port flexibility multimodes
The fault recovery of pass controls optimization method.
Background technique
Currently, power distribution network has the problems such as construction lag, unreasonable structure, limited control measures, and then influence power distribution network
Run flexibility and the feeder load equilibrium degree of control.Flexible multimode switch is able to achieve power distribution network flexible modulation thus causes to close
Note.Flexible multimode switch refers to the electronic power convertor being connected in power distribution network between two and its two or more feeder lines,
Using power electronics new technology, compared with ordinary tap, not only have on and off two states, and it is continuously controllable to increase power
State has both the features such as operational mode flexibility switches, control mode is versatile and flexible.
Flexible multimode switch connects adjacent feeder line, and to provide non-firm power supply connection, power loss event occurs in feeder line
After barrier, flexible multimode switch can restore rapidly the power supply of non-faulting power loss area's important load, realize the self-healing function of power distribution network.By
Power flow between loading condition different on feeder line, radial feeder line is uneven and power loss is high, opens containing flexible multimode
The power distribution network of pass upgrades to closed loop configuration, and the load balancing degrees on feeder line are higher, while also improving power supply reliability.
But the fault recovery based on three port flexibility multimodes switch controls optimization method not disclosed report so far.
Summary of the invention
The present invention is to avoid above-mentioned deficiency of the prior art, and providing one kind can be realized power distribution network important load
Uninterrupted power supply and the higher fault recovery based on three port flexibility multimodes switch of feeder line equilibrium degree control optimization method.
The present invention adopts the following technical scheme that in order to solve the technical problem
The characteristics of the present invention is based on the fault recovery of three port flexibility multimodes switch controls optimization method is by following step
It is rapid to carry out:
Step 1 determines system parameter, line parameter circuit value, load level, three port flexibility multimodes switch including power distribution network
Capacity, the important load that the position of access, three port flexibility multimodes switch account for the ratio of total load, system reference voltage, with
And the operating status of feeder line；
Step 2, according to the system parameter, it is minimum with power loss region load power loss amount, the feeder line load balancing factor is maximum
Single-goal function is established respectively with the minimum target of via net loss, is calculated using analytic hierarchy process (AHP) and is obtained each target weight vector,
Multi-goal optimizing function is established using each target weight vector sum single-goal function normalized value；With feeder line power-balance,
The operation of three port flexibility multimodes switch, three port flexibility multimodes switch maximum capacity and important load do not power off to constrain item
Part is made of three port flexibility multimode switch load service restoration Optimum Regulations the multi-goal optimizing function and constraint condition
Model；
Step 3 obtains three by solving the three ports flexibility multimode switch load service restoration Optimum Regulation model
Normal and net side optimal power supply value, joins using the optimal power supply value as the active power of power control in port
Value is examined, realizes the optimization of fault recovery control.
The characteristics of the present invention is based on the fault recovery of three port flexibility multimodes switch controls optimization method lies also in:
The objective function f with the minimum target of power loss region load power loss amount1It is characterized by formula (1):
f1=maxP3 (1)
P3The switch connected by power loss feeder line flows power, takes outflow to be positive, inflow is negative；
The objective function f for being up to target with the feeder line load balancing factor2It is characterized by formula (2):
αmFor the load factor of non-power loss feeder line m, m=1,2, β be Rate of average load；
The objective function f with the minimum target of via net loss3It is characterized by formula (3):
PnThe switch connected by feeder line n flows power, and outflow is taken to be positive, and inflow is negative, n=1, and 2,3；
Resistance RnFor feeder line n line resistance；U is system reference voltage；
Feeder line n includes power loss feeder line and non-power loss feeder line m；
The multi-goal optimizing function f is characterized by formula (4):
F=max (ω1f1'+ω2f2'-ω3f3') (4)
f1', f2' and f3' correspond as each objective function f1, f2And f3It is transformed into the normalized value of section [0,1]；
ω1, ω2And ω3Respectively correspond to the weight vectors of target.
The characteristics of the present invention is based on the fault recovery of three port flexibility multimodes switch controls optimization method lies also in:
The constraint condition of the feeder line power-balance is characterized by formula (5):
PGm-PLm=Pm (5)
Wherein, PGmFor the electrical power generators power of non-power loss feeder line m, PLmFor the bearing power of non-power loss feeder line m, PmIt is non-
The switch that power loss feeder line m is connected flows power, takes outflow to be positive, inflow is negative；
The constraint condition of the three ports flexibility multimode switch operation is characterized by formula (6):
Wherein, PnThe switch connected by feeder line n flows power, takes outflow to be positive, inflow is negative；
The constraint condition of the three ports flexibility multimode switch maximum capacity is characterized by formula (7):
The switch maximum capacity connected by feeder line n；
The constraint condition that the important load does not power off is characterized by formula (8):
P3≥PL3Inportant (8)
PL3InportantFor the important load power on power loss feeder line.
The characteristics of the present invention is based on the fault recovery of three port flexibility multimodes switch controls optimization method lies also in: being directed to
Fault recovery problem, by each target according to importance divided rank as follows:
Power loss region load power loss amount reflects the effect of load restoration power supply, as the 1st grade target；
The feeder line load balancing factor reflects the effect of power up power supply, as the 2nd grade target；
Via net loss reflects systematic economy operation conditions, as the 3rd grade target；
It is thus determined that the judgment matrix J in the analytic hierarchy process (AHP) is characterized by formula (9):
Each target weight vector ω is obtained according to the judgment matrix J characterized by formula (9)1, ω2And ω3Are as follows:
[ω1,ω2,ω3]=[0.478,0.350,0.172]
The multi-goal optimizing function f obtained using each objective function normalized value of each target weight vector sum is by formula (4) institute
Characterization.
Compared with the prior art, the invention has the advantages that:
1, the present invention is based on the fault recovery control optimization methods of three port flexibility multimodes switch can be realized power distribution network
Important load uninterrupted power supply and feeder line equilibrium degree are higher.
2, the present invention realizes important load power supply by establishing the power loss region the smallest objective function of load power loss amount
Meanwhile reaching the smallest purpose of load power loss amount, feedback is improved by establishing the maximum objective function of the feeder line load balancing factor
Linear load equilibrium degree meets the cost-effectiveness requirement of power distribution network by establishing the smallest objective function of via net loss, is subsequent
Service restoration provides basis.
3, three port flexibility multimodes switch increases power on the basis of having on and off two states in the present invention
Continuous controllable state realizes that trend is mutually helped between each port.
4, the fault recovery control optimization method that the present invention uses, while taking into account feeder line equilibrium degree and cost-effectiveness requirement
Improve power supply reliability.
Detailed description of the invention
Fig. 1 is that the present invention is based on the fault recovery control method flow charts that three port flexibility multimodes switch；
Fig. 2 is three port flexibility multimodes switch access power distribution network schematic diagram in the case of a feeder line power loss；
Fig. 3 is load power loss amount histogram compared with feeder line equilibrium degree optimization front and back.
Specific implementation method
Referring to Fig. 1, the fault recovery control optimization method in the present embodiment based on three port flexibility multimodes switch is pressed such as
Lower step carries out:
Step 1 determines system parameter, the line parameter circuit value including power distribution network: feeder line resistance RnWith non-power loss feeder line m's
Electrical power generators power PGm；Load level: the bearing power P of non-power loss feeder line mLm, the load factor α of non-power loss feeder line mmAnd it is flat
Equal load factor β；The position of three port flexibility multimodes switch access: three port flexibility multimodes switch connects in power distribution network end；
The capacity of three port flexibility multimodes switch: the switch maximum capacity that feeder line n is connectedImportant load accounts for the ratio of total load
Example: the important load power P on power loss feeder lineL3Inportant；System reference voltage U；And the operating status of feeder line: power loss/non-
Power failure state.
Referring to fig. 2, the three port flexibility multimodes switch of power distribution network connects three feeder lines, respectively feeder line in the present embodiment
1, feeder line 2 and feeder line 3, set feeder line 1 and feeder line 2 is non-power loss feeder line, and feeder line 3 is power loss feeder line；Determine the function of three feeder lines
It is 1m Ω that equivalent resistance, which is lost, in rate, and exchange side filter inductance is 0.5mH, and 1 load of feeder line is the ohmic load of 0.082 Ω,
2 load of feeder line is the ohmic load of 0.1 Ω, and 3 load of feeder line is the ohmic load of 0.1 Ω, and 3 important load of feeder line is the electricity of 1 Ω
Resistance load, the transmission capacity of feeder line 1, feeder line 2 and feeder line 3 are respectively 3.4MVA, 1.7MVA and 1.9MVA, the flexible more shapes in three ports
The rated capacity of state switch is 0.4MVA, and AC system voltage is 380V/50Hz, and the direct current of three port flexibility multimodes switch is female
It is 1000V that line voltage, which controls target, and DC side Support Capacitor is 10000 μ F.
Step 2, foundation system parameter, feeder line load balancing factor maximum minimum with power loss region load power loss amount and net
Network is lost minimum target and establishes single-goal function respectively, wherein power loss region load power loss amount Minimal Realization important load
Load power loss amount is minimum while power supply；Feeder line load balancing factor maximum improves feeder line load balancing degrees；Via net loss is most
The small cost-effectiveness requirement for meeting power distribution network；Since each target importance is different, layer is used according to the importance rate of each target
Fractional analysis, which calculates, obtains each target weight vector, is established using each single-goal function normalized value of each target weight vector sum more
Objective optimization function；It is maximum with feeder line power-balance, the operation of three port flexibility multimodes switch, three port flexibility multimodes switch
Capacity and important load do not power off as constraint condition, and three port flexibility multimodes are made of multi-goal optimizing function and constraint condition
Switch load service restoration Optimum Regulation model.
Step 3 obtains three ports by solving three port flexibility multimode switch load service restoration Optimum Regulation models
In normal and net side optimal power supply value, have using optimal power supply value as power control in matlab emulation experiment
Function value and power reference realizes the optimization of fault recovery control.
In specific implementation, with the objective function f of the minimum target of power loss region load power loss amount1It is characterized by formula (1):
f1=maxP3 (1)
P3The switch connected by power loss feeder line flows power, takes outflow to be positive, inflow is negative.
It is up to the objective function f of target with the feeder line load balancing factor2It is characterized by formula (2):
αmFor the load factor of non-power loss feeder line m, m=1,2, β be Rate of average load.
With the objective function f of the minimum target of via net loss3It is characterized by formula (3):
PnThe switch connected by feeder line n flows power, and outflow is taken to be positive, and inflow is negative, n=1, and 2,3；
Resistance RnFor feeder line n line resistance；U is system reference voltage；Feeder line n includes power loss feeder line and non-power loss feeder line m.
Multi-goal optimizing function f is characterized by formula (4):
F=max (ω1f1'+ω2f2'-ω3f3') (4)
f1', f2' and f3' correspond as each objective function f1, f2And f3It is transformed into the normalized value of section [0,1]；ω1,
ω2And ω3Respectively correspond to the weight vectors of target.
In specific implementation, the constraint condition of feeder line power-balance is characterized by formula (5):
PGm-PLm=Pm (5)
Wherein, PGmFor the electrical power generators power of non-power loss feeder line m, PLmFor the bearing power of non-power loss feeder line m, PmIt is non-
The switch that power loss feeder line m is connected flows power, takes outflow to be positive, inflow is negative.
The constraint condition of three port flexibility multimodes switch operation is characterized by formula (6):
Wherein, PnThe switch connected by feeder line n flows power, takes outflow to be positive, inflow is negative；
The constraint condition of three port flexibility multimodes switch maximum capacity is characterized by formula (7):
The switch maximum capacity connected by feeder line n；
The constraint condition that important load does not power off is characterized by formula (8):
P3≥PL3Inportant (8)
PL3InportantFor the important load power on power loss feeder line.
In the present embodiment, for fault recovery problem, by each target according to importance divided rank as follows:
Power loss region load power loss amount reflects the effect of load restoration power supply, as the 1st grade target；Feeder line load balancing
The factor reflects the effect of power up power supply, as the 2nd grade target；Via net loss reflects systematic economy operation conditions, as
3rd grade target.
Analytic hierarchy process (AHP) is the weight determined between each target by being compared to each other two-by-two, each element in judgment matrix J
aijValue be the i-th grade target with respect to the value that compares two-by-two of jth grading index progress importance, wherein aii=1, aij> 0,If taking a12=1, show that the 1st grade target is of equal importance with respect to the 2nd grade target, and a21=1；
If taking a12=2, then show that the 1st grade target is slightly important with respect to the 2nd grade target, thenShow that the 2nd grade target is opposite
1st grade target is slightly secondary；If taking a12=3, then show that the 1st grade target is important with respect to the 2nd grade target, andShow
2nd grade target is secondary with respect to the 1st grade target.It is thus determined that the judgment matrix J in analytic hierarchy process (AHP) is characterized by formula (9):
Matrix disposal, which is carried out, for the judgment matrix J that formula (9) is characterized obtains each target weight vector ω1, ω2And ω3:
Calculate the element product M for obtaining the i-th row of judgment matrix JiAre as follows:
It calculates and obtains Mi3 th Root WiAre as follows:
To vector W1,W2And W3It carries out normalizing and obtains each target weight vector ω of judgment matrix J acquisition1, ω2And ω3Are as follows:
[ω1,ω2,ω3]=[0.478,0.350,0.172]
The multi-goal optimizing function f obtained using each objective function normalized value of each target weight vector sum is by formula (4) institute
Characterization, three port flexibility multimode switch load service restoration Optimum Regulation moulds are made of multi-goal optimizing function and constraint condition
Type.
In specific implementation, powered using three port flexibility multimode switch loads of optimization planning software GAMS Program
Recovery and optimization regulation-control model obtains normal and net side optimal power supply value P in three ports1And P2, with optimal power supply value
As the active power reference value of power control in matlab emulation experiment, the optimization of fault recovery control is realized.
Result after the three port flexibility multimode switch load service restoration Optimum Regulation model optimizations used exists
Emulation experiment is carried out in matlab software, the switch that feeder line 1 is connected in power distribution network is with UdcThe operation of Q control model, feeder line 2 connect
With the operation of PQ control model, the switch that feeder line 3 is connected is run the switch connect with sagging control model；Flexible multimode switch three
Port transmission active-power P1、P2、P30.144MVA, 0.256MVA, -0.4MVA are taken respectively.
Matlab the simulation experiment result, which is shown on power loss feeder line, has 17.5% feeder load to restore electricity, and includes among these
10% important load；The load balancing degrees of non-faulting feeder line optimization front and back are increased to 94.90% by 83.43%, and load is lost
Histogram compared with electricity optimizes front and back with feeder line equilibrium degree is as shown in figure 3, matlab the simulation experiment result explanation is based on three ports
Important load power supply, balanced feeder line load can be effectively ensured in the fault recovery control optimization method of flexible multimode switch.
Claims (4)
1. the fault recovery based on three port flexibility multimodes switch controls optimization method, it is characterized in that carrying out as follows:
Step 1 determines system parameter, line parameter circuit value, load level, the switch access of three port flexibility multimodes including power distribution network
Position, three port flexibility multimodes switch capacity, important load account for the ratio of total load, system reference voltage, Yi Jikui
The operating status of line；
Step 2, according to the system parameter, the feeder line load balancing factor minimum with power loss region load power loss amount be maximum and net
Network is lost minimum target and establishes single-goal function respectively, is calculated using analytic hierarchy process (AHP) and obtains each target weight vector, utilizes
Each target weight vector sum single-goal function normalized value establishes multi-goal optimizing function；With feeder line power-balance, three ends
Mouthful flexible multimode switch operation, three port flexibility multimodes switch maximum capacity and important load do not power off as constraint condition,
Three port flexibility multimode switch load service restoration Optimum Regulation moulds are made of the multi-goal optimizing function and constraint condition
Type；
Step 3 obtains three ports by solving the three ports flexibility multimode switch load service restoration Optimum Regulation model
In normal and net side optimal power supply value, using the optimal power supply value as the active power reference of power control
Value realizes the optimization of fault recovery control.
2. the fault recovery according to claim 1 based on three port flexibility multimodes switch controls optimization method, special
Sign is:
The objective function f with the minimum target of power loss region load power loss amount1It is characterized by formula (1):
f1=max P3 (1)
P3The switch connected by power loss feeder line flows power, takes outflow to be positive, inflow is negative；
The objective function f for being up to target with the feeder line load balancing factor2It is characterized by formula (2):
αmFor the load factor of non-power loss feeder line m, m=1,2, β be Rate of average load；
The objective function f with the minimum target of via net loss3It is characterized by formula (3):
PnThe switch connected by feeder line n flows power, and outflow is taken to be positive, and inflow is negative, n=1, and 2,3；
Resistance RnFor feeder line n line resistance；U is system reference voltage；
Feeder line n includes power loss feeder line and non-power loss feeder line m；
The multi-goal optimizing function f is characterized by formula (4):
F=max (ω1f1'+ω2f2'-ω3f3') (4)
f1', f2' and f3' correspond as each objective function f1, f2And f3It is transformed into the normalized value of section [0,1]；
ω1, ω2And ω3Respectively correspond to the weight vectors of target.
3. the fault recovery according to claim 2 based on three port flexibility multimodes switch controls optimization method, special
Sign is:
The constraint condition of the feeder line power-balance is characterized by formula (5):
PGm-PLm=Pm (5)
Wherein, PGmFor the electrical power generators power of non-power loss feeder line m, PLmFor the bearing power of non-power loss feeder line m, PmFor non-power loss
The switch that feeder line m is connected flows power, takes outflow to be positive, inflow is negative；
The constraint condition of the three ports flexibility multimode switch operation is characterized by formula (6):
Wherein, PnThe switch connected by feeder line n flows power, takes outflow to be positive, inflow is negative；
The constraint condition of the three ports flexibility multimode switch maximum capacity is characterized by formula (7):
The switch maximum capacity connected by feeder line n；
The constraint condition that the important load does not power off is characterized by formula (8):
P3≥PL3Inportant (8)
PL3InportantFor the important load power on power loss feeder line.
4. the fault recovery according to claim 2 or 3 based on three port flexibility multimodes switch controls optimization method,
It is characterized in: for fault recovery problem, by each target according to importance divided rank as follows:
Power loss region load power loss amount reflects the effect of load restoration power supply, as the 1st grade target；
The feeder line load balancing factor reflects the effect of power up power supply, as the 2nd grade target；
Via net loss reflects systematic economy operation conditions, as the 3rd grade target；
It is thus determined that the judgment matrix J in the analytic hierarchy process (AHP) is characterized by formula (9):
Each target weight vector ω is obtained according to the judgment matrix J characterized by formula (9)1, ω2And ω3Are as follows:
[ω1,ω2,ω3]=[0.478,0.350,0.172]；
It is characterized using the multi-goal optimizing function f that each objective function normalized value of each target weight vector sum obtains by formula (4).
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