CN105244889A - Power distribution network reactive power compensation planning method - Google Patents
Power distribution network reactive power compensation planning method Download PDFInfo
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- CN105244889A CN105244889A CN201510431846.5A CN201510431846A CN105244889A CN 105244889 A CN105244889 A CN 105244889A CN 201510431846 A CN201510431846 A CN 201510431846A CN 105244889 A CN105244889 A CN 105244889A
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Abstract
The present invention relates to a power distribution network reactive power compensation planning method. Through the setting of a reactive power compensation planning target, condition constraint and selected typical region calculation and the expansion to an entire network, the optimal compensation capacity and economic efficiency of reactive power compensation planning are obtained, the network loss is effectively reduced by using the reactive power compensation planning, the reasonable configuration of a reactive power compensation capacity is realized, and the safe and economic operation of a power system is ensured.
Description
Technical field
The present invention relates to a kind of technical field of power distribution network power supply optimization, specifically, is the method for a kind of distribution network var compensation planning.
Background technology
Power distribution network also carries reactive power while carrying active power to power consumer.On the one hand, reactive power is the principal element affecting quality of voltage.When electric network composition and voltage are determined, and active power one timing, voltage loss is mainly relevant with the numerical value of conveying reactive power.On the other hand, power distribution network larger, nearly all load and power distribution network element all need consume reactive power, because China's power distribution network powering area is large, supply terminals is many, although electric network reconstruction for many years makes the quality of power supply be greatly improved, still there is the problem that line end voltage is low, power loss is large in some areas.Traditional empirically or based on project plan comparison, more rough reactive power compensation planning computational methods have been difficult to meet Modern power distribution net to the improvement of quality of voltage and the requirement reducing line loss.
Summary of the invention
Based on the deficiencies in the prior art, the present invention proposes the method for a kind of distribution network var compensation planning, and for power distribution network, the idle object of planning comprises:
Hierarchical and regional balance: layering requires meeting in the rational situation of power factor, each electric pressure reactive power source will with the reactive power reasonable balance that totally consumes in this layer, the flowing of minimizing reactive power between different electric pressure.Reactive Power Control between zones of different in rational level, is avoided Cross transfer and the use of reactive power source by zoning requirements.
Idlely not send: under Smaller load state should being avoided to medium voltage distribution network, oppositely carry reactive power to high voltage distribution network, if necessary, the superfluous capacitive reactive power of part in parallel reactive balance part can be increased; The publicly-owned transformer of low-voltage network should be able to reasonably adjust idle exerting oneself, and prevents from sending reactive power to medium voltage distribution network.
Power factor is qualified: to power distribution network, requires that its main transformer high-pressure side power factor after compensation arrangement drops into reaches setting.
Voltage deviation is qualified: in all powering area of power distribution network, and the permissible variation of voltage magnitude is controlled within the limits prescribed.
Theory wire loss value is qualified: the network loss of whole low and medium voltage distribution network reasonably should be reduced after adding reactive-load compensation equipment.
Before carrying out idle planning, the reactive apparatus investment in select target year and the comprehensive cost of system active power loss are economized as target function most, namely
In formula: B is revised active electricity price; T
maxfor the annual maximum load utilization hours number of the whole network, Y is the service life of compensation equipment;
for the active loss that system under normal condition is total; R is the number of reactive-load compensation equipment to be installed; C
ibe i-th price that may compensate the unit capacity through correction of place compensation equipment: Q
cfor condenser capacity to be installed; S
bfor reference power.
Power constraints is
In formula: P
i, Q
ifor the injection of node i is meritorious, idle; U
i, U
jfor node i, the voltage magnitude of j; G
ij, B
ij, δ
ijbe respectively node i, the conductance between j, susceptance and phase difference of voltage; H represents all node set be directly connected with node i.
Control variables constraint condition is:
U
gmin≤U
gi≤U
gmax
Q
cmin≤Q
ci≤Q
cmax
T
tmin≤T
ti≤T
tmax
In formula, U
gi, U
gmax, U
gminbe respectively generator terminal voltage and upper limit value and lower limit value thereof, Q
ci, Q
cmax, Q
cminbe respectively capacitive reactive power compensation capacity and upper limit value and lower limit value thereof, T
ti, T
tmax, T
tminbe respectively adjustable transformer tap joint position and upper limit value and lower limit value thereof;
State variable constrain equation is:
Q
gmin≤Q
gi≤Q
gmax
U
cmin≤U
ci≤U
cmax
In formula: Q
gi, Q
gmax, Q
gminbe respectively generator reactive to exert oneself and upper limit value and lower limit value; U
ci, U
cmax, U
cminbe respectively node voltage amplitude and upper limit value and lower limit value thereof.
When idle planning, carry out representative region division according to the impact load value of idle size and electric power networks parameter to electrical network, the method for division is: first to all transformer stations according to synthetic load property sort; And then each type load characteristic is classified according to cable composition.According to synthetic load characteristic, power distribution network is divided into C class, is divided into n class again according to cable composition, whole power distribution network transformer station number is N:
Configuration that transformer station's low-voltage bus bar outlet side is idle extend to whole representative region:
Whole j type load characteristic representative region transformer station idle configuration C
djfor
In formula, S
ijthe idle configuration of the characteristic typical substation low-voltage side of j type load for i circuit types, β
ijnumber for the representative region transformer station with the j type load characteristic curve feature of i circuit types accounts for the ratio of all j type load characteristic transformer stations sum, α
jit is the ratio that the number of the representative region transformer station of all j type load characteristic curve features accounts for overall power distribution network transformer station sum.
Extend to whole power distribution network;
The idle configuration C of the transformer low voltage bus outlet side of whole power distribution network
d
When carrying out reactive power compensation to circuit, the magnitude of voltage of circuit can be caused to change, thus the line loss value of circuit can be changed.
The relative value of the pressure drop of the circuit caused before and after switched capacitor;
In formula, k
cfor penalty coefficient,
k
rXfor line impedance ratio, ctg φ is the cotangent value at load power factor angle, Q
cfor the reactive power of the capacitor of switching, Q
lfor load or burden without work.
Can draw thus, Reactive Power Control is to the impact effect of line drop and penalty coefficient k
c, the cotangent ctg φ at load power factor angle and the impedance ratio k of circuit
rXclosely related.Penalty coefficient is larger, and the relative value of line drop is larger: the impedance ratio of circuit is larger, and the relative value of pressure drop is less; Load power factor is low, and the effect reducing voltage loss is also obvious.When load power factor is determined, by changing the reactive power of switched capacitors, reaching the object reducing line voltage distribution loss, thus the electrical network quality of power supply is increased.
The optimal non-workcompensation capacity of reactive power compensation is:
Q
C＝β
crP
maxtanφ
1
In formula, β
crfor the optimal compensation rate, P
maxfor maximum active power, tan φ
1for user's natural power factor tangent of an angle value before reactive power compensation;
Wherein,
In formula, K
ecfor the economic value of reactive power, K
pfor the economic value (can be recorded by user side) of active power
Wherein, the economic value of reactive power is:
In formula, B is reactive power compensation rate, and S is for compensating front maximum apparent power, sin φ
1for the sine value at natural power factor angle, R is the effective resistance that user arrives between power supply, and U is supply power voltage.
Reactive power compensation planning annual earnings P be the surplus of saving electricity profit deduction depreciation cost Z and maintenance expense W, that is:
P＝(ΔE-E
Q)·β-Z-W
In formula, Δ E is for falling damage electricity; E
qfor the power consumption of capacitor; β is electricity price.
Wherein falling damage electricity Δ E is:
ΔE＝ΔP
max·F·t
In formula, Δ P
maxfor damage power falls in peak load; F is loss factor, is the average power loss in the line loss calculation period and the ratio of maximum load power loss; T is that capacitor puts into operation the time.
The power consumption of capacitor is:
E
Q＝Q
C·T·σ
In formula, Q
cfor reactive compensation capacity; T is that capacitor puts into operation the time; σ is the ratio that reactive-load compensation equipment loss power accounts for compensation capacity.
The detailed process of idle planning is:
The first step: collect actual power distribution network data.Comprising: the impedance of power distribution network every bar branch road, the historical data of each node load and node voltage;
Second step: the historical data analyzing load or burden without work point, obtains the maximum no-power vacancy of network and the maximum synthetic load of each node;
3rd step: the idle configuration optimization model that to set up with network loss and reactive apparatus the smallest investment be target, with power flow equation as constraints, and makes restriction to state variable and control variables;
4th step: establish the maximum synthetic load of each load or burden without work point as initial compensation capacity, obtain the optimal compensation point.
5th step: maximum for compensation point synthetic load is added, and obtain the maximum synthetic load proportion wherein of each point, maximum for network no-power vacancy is given compensation point in this ratio, and as the highest compensation capacity of this point, and the maximum synthetic load of each point is second advanced compensation capacity.
6th step: make matching load curve according to the historical data of determined compensation point, determines other compensation capacities at different levels.
After having planned, carry out reactive power compensation according to electrical network practical operation situation, concrete compensation way is:
(1) carry out the Load flow calculation of minimum mode, determine that initial compensation is counted k.
(2) reactive compensation values of each node is calculated.
(3) point selecting reactive compensation values maximum is this compensation point.
(4) carry out Load flow calculation, obtain this compensation point without work value.
(5) using idle for the calculating of this some compensation capacity as this point.
(6) reactive power compensation is counted, and oneself reaches k, then turn (7) step, otherwise turns (2) step.
(7) carry out Load flow calculation that is minimum, general and maximum mode, and carry out the calculating of rate of qualified voltage.
(8) if rate of qualified voltage is greater than 95%, then turn (9) step, otherwise select voltage minimum point to increase by one group of compensation, and then turn (7) step.
(9) check whether minimum mode has reactive power releasing.If have, whether be less than 10% of load or burden without work, if do not meet, then reduce from the nearest reactive compensation capacity of desired value until meet; When send idle be less than load or burden without work lO% after perform next step.
(10) result of calculation is exported, compensation point, compensation capacity, each point voltage, network loss and rate of qualified voltage thereof etc.
Distribution Ceneralized Benders'Decomposition can reduce network loss effectively, ensures quality of voltage, prevent accident generation or Accident prevention expansion.Avoid the blindness of idle construction, carry out the reasonable disposition that idle work optimization realizes reactive compensation capacity, being not only master plan department and carrying out the indispensable instrument of electric network reactive-load planning construction, is also the very important work ensureing power system security, economical operation and quality supply.Make full use of the own characteristic of power distribution network, in planning, Optimal Reactive Power power supply point, determines compensation capacity, and be in operation reasonable switching reactive power source, has important economic benefit and realistic meaning to the quality of power supply of minimizing electric energy loss, improvement system.
Accompanying drawing explanation
Fig. 1 is the compensation process of the method for distribution network var compensation of the present invention planning.
Embodiment
A method for distribution network var compensation planning, for power distribution network, the idle object of planning comprises:
Hierarchical and regional balance: layering requires meeting in the rational situation of power factor, each electric pressure reactive power source will with the reactive power reasonable balance that totally consumes in this layer, the flowing of minimizing reactive power between different electric pressure.Reactive Power Control between zones of different in rational level, is avoided Cross transfer and the use of reactive power source by zoning requirements.
Idlely not send: under Smaller load state should being avoided to medium voltage distribution network, oppositely carry reactive power to high voltage distribution network, if necessary, the superfluous capacitive reactive power of part in parallel reactive balance part can be increased; The publicly-owned transformer of low-voltage network should be able to reasonably adjust idle exerting oneself, and prevents from sending reactive power to medium voltage distribution network.
Power factor is qualified: to power distribution network, requires that its main transformer high-pressure side power factor after compensation arrangement drops into reaches setting.
Voltage deviation is qualified: in all powering area of power distribution network, and the permissible variation of voltage magnitude is controlled within the limits prescribed.
Theory wire loss value is qualified: the network loss of whole low and medium voltage distribution network reasonably should be reduced after adding reactive-load compensation equipment.
Before carrying out idle planning, the reactive apparatus investment in select target year and the comprehensive cost of system active power loss are economized as target function most, namely
In formula: B is revised active electricity price; T
maxfor the annual maximum load utilization hours number of the whole network, Y is the service life of compensation equipment;
for the active loss that system under normal condition is total; R is the number of reactive-load compensation equipment to be installed; C
ibe i-th price that may compensate the unit capacity through correction of place compensation equipment: Q
cfor condenser capacity to be installed; S
bfor reference power.
Power constraints is
In formula: P
i, Q
ifor the injection of node i is meritorious, idle; U
i, U
jfor node i, the voltage magnitude of j; G
ij, B
ij, δ
ijbe respectively node i, the conductance between j, susceptance and phase difference of voltage; H represents all node set be directly connected with node i.
Control variables constraint condition is:
U
gmin≤U
gi≤U
gmax
Q
cmin≤Q
ci≤Q
cmax
T
tmin≤T
ti≤T
tmax
In formula, U
gi, U
gmax, U
gminbe respectively generator terminal voltage and upper limit value and lower limit value thereof, Q
ci, Q
cmax, Q
cminbe respectively capacitive reactive power compensation capacity and upper limit value and lower limit value thereof, T
ti, T
tmax, T
tminbe respectively adjustable transformer tap joint position and upper limit value and lower limit value thereof;
State variable constrain equation is:
Q
gmin≤Q
gi≤Q
gmax
U
cmin≤U
ci≤U
cmax
In formula: Q
gi, Q
gmax, Q
gminbe respectively generator reactive to exert oneself and upper limit value and lower limit value; U
ci, U
cmax, U
cminbe respectively node voltage amplitude and upper limit value and lower limit value thereof.
When idle planning, carry out representative region division according to the impact load value of idle size and electric power networks parameter to electrical network, the method for division is: first to all transformer stations according to synthetic load property sort; And then each type load characteristic is classified according to cable composition.According to synthetic load characteristic, power distribution network is divided into C class, is divided into n class again according to cable composition, whole power distribution network transformer station number is N:
Configuration that transformer station's low-voltage bus bar outlet side is idle extend to whole representative region:
Whole j type load characteristic representative region transformer station idle configuration C
djfor
In formula, S
ijthe idle configuration of the characteristic typical substation low-voltage side of j type load for i circuit types, β
ijnumber for the representative region transformer station with the j type load characteristic curve feature of i circuit types accounts for the ratio of all j type load characteristic transformer stations sum, α
jit is the ratio that the number of the representative region transformer station of all j type load characteristic curve features accounts for overall power distribution network transformer station sum.
Extend to whole power distribution network
The idle configuration C of the transformer low voltage bus outlet side of whole power distribution network
d;
When carrying out reactive power compensation to circuit, the magnitude of voltage of circuit can be caused to change, thus the line loss value of circuit can be changed.
The relative value of the pressure drop of the circuit caused before and after switched capacitor
In formula, k
cfor penalty coefficient,
k
rXfor line impedance ratio, ctg φ is the cotangent value at load power factor angle, Q
cfor the reactive power of the capacitor of switching, Q
lfor load or burden without work.
Can draw thus, Reactive Power Control is to the impact effect of line drop and penalty coefficient k
c, the cotangent ctg φ at load power factor angle and the impedance ratio k of circuit
rXclosely related.Penalty coefficient is larger, and the relative value of line drop is larger: the impedance ratio of circuit is larger, and the relative value of pressure drop is less; Load power factor is low, and the effect reducing voltage loss is also obvious.When load power factor is determined, by changing the reactive power of switched capacitors, reaching the object reducing line voltage distribution loss, thus the electrical network quality of power supply is increased.
The optimal non-workcompensation capacity of reactive power compensation is
Q
C＝β
crP
maxtanφ
1
In formula, β
crfor the optimal compensation rate, P
maxfor maximum active power, tan φ
1for user's natural power factor tangent of an angle value before reactive power compensation;
Wherein,
In formula, K
ecfor the economic value of reactive power, K
pfor the economic value (can be recorded by user side) of active power
Wherein, the economic value of reactive power is
In formula, B is reactive power compensation rate, and S is for compensating front maximum apparent power, sin φ
1for the sine value at natural power factor angle, R is the effective resistance that user arrives between power supply, and U is supply power voltage.
Reactive power compensation planning annual earnings P be the surplus of saving electricity profit deduction depreciation cost Z and maintenance expense W, that is:
P＝(ΔE-E
Q)·β-Z-W
In formula, Δ E is for falling damage electricity; E
qfor the power consumption of capacitor; β is electricity price.
Wherein falling damage electricity Δ E is
ΔE＝ΔP
max·F·t
In formula, Δ P
maxfor damage power falls in peak load; F is loss factor, is the average power loss in the line loss calculation period and the ratio of maximum load power loss; T is that capacitor puts into operation the time.
The power consumption of capacitor is:
E
Q＝Q
C·T·σ
In formula, Q
cfor reactive compensation capacity; T is that capacitor puts into operation the time; σ is the ratio that reactive-load compensation equipment loss power accounts for compensation capacity.
The detailed process of idle planning is
The first step: collect actual power distribution network data.Comprising: the impedance of power distribution network every bar branch road, the historical data of each node load and node voltage;
Second step: the historical data analyzing load or burden without work point, obtains the maximum no-power vacancy of network and the maximum synthetic load of each node;
3rd step: the idle configuration optimization model that to set up with network loss and reactive apparatus the smallest investment be target, uses trend side
Cheng Zuowei constraints, and restriction is made to state variable and control variables;
4th step: establish the maximum synthetic load of each load or burden without work point as initial compensation capacity, obtain the optimal compensation point.
5th step: maximum for compensation point synthetic load is added, and obtain the maximum synthetic load proportion wherein of each point, maximum for network no-power vacancy is given compensation point in this ratio, and as the highest compensation capacity of this point, and the maximum synthetic load of each point is second advanced compensation capacity.
6th step: make matching load curve according to the historical data of determined compensation point, determines other compensation capacities at different levels.
After having planned, carry out reactive power compensation according to electrical network practical operation situation, concrete compensation way is:
(1) carry out the Load flow calculation of minimum mode, determine that initial compensation is counted k.
(2) reactive compensation values of each node is calculated.
(3) point selecting reactive compensation values maximum is this compensation point.
(4) carry out Load flow calculation, obtain this compensation point without work value.
(5) using idle for the calculating of this some compensation capacity as this point.
(6) reactive power compensation is counted, and oneself reaches k, then turn (7) step, otherwise turns (2) step.
(7) carry out Load flow calculation that is minimum, general and maximum mode, and carry out the calculating of rate of qualified voltage.
(8) if rate of qualified voltage is greater than 95%, then turn (9) step, otherwise select voltage minimum point to increase by one group of compensation,
And then turn (7) step.
(9) check whether minimum mode has reactive power releasing.If have, whether be less than 10% of load or burden without work, if do not meet, then reduce from the nearest reactive compensation capacity of desired value until meet; When send idle be less than load or burden without work lO% after perform next step.
(10) result of calculation is exported, compensation point, compensation capacity, each point voltage, network loss and rate of qualified voltage thereof etc.
Distribution Ceneralized Benders'Decomposition can reduce network loss effectively, ensures quality of voltage, prevent accident generation or Accident prevention expansion.Avoid the blindness of idle construction, carry out the reasonable disposition that idle work optimization realizes reactive compensation capacity, being not only master plan department and carrying out the indispensable instrument of electric network reactive-load planning construction, is also the very important work ensureing power system security, economical operation and quality supply.Make full use of the own characteristic of power distribution network, in planning, Optimal Reactive Power power supply point, determines compensation capacity, and be in operation reasonable switching reactive power source, has important economic benefit and realistic meaning to the quality of power supply of minimizing electric energy loss, improvement system.
The foregoing is only of the present invention and be preferably not limited to the present invention, obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (6)
1. a method for distribution network var compensation planning, it is characterized in that, the idle object of planning comprises: hierarchical and regional balance, idlely not give, power factor is qualified, voltage deviation is qualified, theory wire loss value is qualified.
2. as the method for the distribution network var compensation planning in claim 1, it is characterized in that, before carrying out idle planning, the reactive apparatus investment in select target year and the comprehensive cost of system active power loss are economized as target function most, namely
In formula: B is revised active electricity price; T
maxfor the annual maximum load utilization hours number of the whole network, Y is the service life of compensation equipment;
for the active loss that system under normal condition is total; R is the number of reactive-load compensation equipment to be installed; C
ibe i-th price that may compensate the unit capacity through correction of place compensation equipment: Q
cfor condenser capacity to be installed; S
bfor reference power.
3., as the method for the distribution network var compensation planning in claim 2, it is characterized in that, power constraints is:
In formula: P
i, Q
ifor the injection of node i is meritorious, idle; U
i, U
jfor node i, the voltage magnitude of j; G
ij, B
ij, δ
ijbe respectively node i, the conductance between j, susceptance and phase difference of voltage; H represents all node set be directly connected with node i;
Control variables constraint condition is:
U
gmin≤U
gi≤U
gmax
Q
cmin≤Q
ci≤Q
cmax
T
tmin≤T
ti≤T
tmax
In formula, U
gi, U
gmax, U
gminbe respectively generator terminal voltage and upper limit value and lower limit value thereof, Q
ci, Q
cmax, Q
cminbe respectively capacitive reactive power compensation capacity and upper limit value and lower limit value thereof, T
ti, T
tmax, T
tminbe respectively adjustable transformer tap joint position and upper limit value and lower limit value thereof;
State variable constrain equation is:
Q
gmin≤Q
gi≤Q
gmax
U
cmin≤U
ci≤U
cmax
In formula: Q
gi, Q
gmax, Q
gminbe respectively generator reactive to exert oneself and upper limit value and lower limit value; U
ci, U
cmax, U
cminbe respectively node voltage amplitude and upper limit value and lower limit value thereof.
4., as the method for the distribution network var compensation planning in claim 3, it is characterized in that, according to synthetic load characteristic, power distribution network is divided into C class, be divided into n class again according to cable composition, whole power distribution network transformer station number is N:
Configuration that transformer station's low-voltage bus bar outlet side is idle extend to whole representative region:
Whole j type load characteristic representative region transformer station idle configuration C
djfor
In formula, S
ijthe idle configuration of the characteristic typical substation low-voltage side of j type load for i circuit types, β
ijnumber for the representative region transformer station with the j type load characteristic curve feature of i circuit types accounts for the ratio of all j type load characteristic transformer stations sum, a
jit is the ratio that the number of the representative region transformer station of all j type load characteristic curve features accounts for overall power distribution network transformer station sum;
Extend to whole power distribution network
The idle configuration C of the transformer low voltage bus outlet side of whole power distribution network
d
The relative value of the pressure drop of the circuit caused before and after switched capacitor
In formula, k
cfor penalty coefficient,
k
rXfor line impedance ratio, ctg φ is the cotangent value at load power factor angle, Q
cfor the reactive power of the capacitor of switching, Q
lfor load or burden without work.
5., as the method for the distribution network var compensation planning in claim 4, it is characterized in that, the optimal non-workcompensation capacity of reactive power compensation is
In formula, β
crfor the optimal compensation rate, P
maxfor maximum active power, tan φ
1for user's natural power factor tangent of an angle value before reactive power compensation
Wherein,
In formula, k
ecfor the economic value of reactive power, k
pfor the economic value of active power
Wherein, the economic value of reactive power is
In formula, B is reactive power compensation rate, and S is for compensating front maximum apparent power, sin φ
1for the sine value at natural power factor angle, R is the effective resistance that user arrives between power supply, and U is supply power voltage,
Reactive power compensation planning annual earnings P be the surplus of saving electricity profit deduction depreciation cost Z and maintenance expense W, that is:
P＝(ΔE-E
Q)·β-Z-W
In formula, Δ E is for falling damage electricity; E
qfor the power consumption of capacitor; β is electricity price,
Wherein falling damage electricity Δ E is
ΔE＝ΔP
max·F·t
In formula, Δ P
maxfor damage power falls in peak load; F is loss factor, is that the average power in the line loss calculation period loses the ratio with maximum load power loss; T is that capacitor puts into operation the time,
The power consumption of capacitor is:
E
Q＝Q
C·T·σ
In formula, Q
cfor reactive compensation capacity; T is that capacitor puts into operation the time; σ is the ratio that reactive-load compensation equipment loss power accounts for compensation capacity.
6. as the method for the distribution network var compensation planning in claim 5, it is characterized in that, the detailed process of reactive power compensation planning is:
One, collect actual power distribution network data, comprise the impedance of power distribution network every bar branch road, the historical data of each node load and node voltage;
Two, analyze the historical data of load or burden without work point, obtain the maximum no-power vacancy of network and the maximum synthetic load of each node;
Three, the idle configuration optimization model that to set up with network loss and reactive apparatus the smallest investment be target, with power flow equation as constraints, and makes restriction to state variable and control variables;
Four, using the maximum synthetic load of each load or burden without work point as initial compensation capacity, obtain the optimal compensation point,
Five, maximum for compensation point synthetic load is added, and obtain the maximum synthetic load proportion wherein of each point, maximum for network no-power vacancy is given compensation point in this ratio, as the highest compensation capacity of this point, and the maximum synthetic load of each point is second advanced compensation capacity
Six, make matching load curve according to the historical data of determined compensation point, determine other compensation capacities at different levels,
After having planned, carry out reactive power compensation according to electrical network practical operation situation, concrete compensation way is:
1) carry out the Load flow calculation of minimum mode, determine that initial compensation is counted k,
2) reactive compensation values of each node is calculated,
3) point selecting reactive compensation values maximum is this compensation point,
4) carry out Load flow calculation, obtain this compensation point without work value,
5) using idle for the calculating of this some compensation capacity as this point,
6) reactive power compensation is counted, and oneself reaches k, then turn the 7th step, otherwise turns the 2nd step,
7) carry out Load flow calculation that is minimum, general and maximum mode, and carry out the calculating of rate of qualified voltage,
8) if rate of qualified voltage is greater than 95%, then turn the 9th step, otherwise select voltage minimum point to increase by one group of compensation, and then turn the 7th step,
9) check whether minimum mode has reactive power releasing, if having, judge whether be less than load or burden without work 10%, if do not meet, then reduce from the nearest reactive compensation capacity of desired value until meet; When send idle be less than load or burden without work lO% after perform next step,
10) export result of calculation, comprise compensation point, compensation capacity, each point voltage, network loss and rate of qualified voltage thereof.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655174A (en) * | 2017-01-03 | 2017-05-10 | 昆明理工大学 | Comprehensive reconstruction optimization method for power distribution network |
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| CN110994631A (en) * | 2019-12-13 | 2020-04-10 | 国网北京市电力公司 | Power grid gateway power factor calculation method and device and electronic equipment |
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| CN116865287A (en) * | 2023-08-31 | 2023-10-10 | 广东电网有限责任公司肇庆供电局 | Power distribution network voltage reactive compensation adjustment method, device, equipment and storage medium |
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