CN104362641A - Method for configuring power distribution reactive and comprehensive control strategies and optimal capacity - Google Patents
Method for configuring power distribution reactive and comprehensive control strategies and optimal capacity Download PDFInfo
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- CN104362641A CN104362641A CN201410568302.9A CN201410568302A CN104362641A CN 104362641 A CN104362641 A CN 104362641A CN 201410568302 A CN201410568302 A CN 201410568302A CN 104362641 A CN104362641 A CN 104362641A
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- gear
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1864—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein the stepless control of reactive power is obtained by at least one reactive element connected in series with a semiconductor switch
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a method for configuring power distribution reactive and comprehensive control strategies and the optimal capacity. The method includes steps of A, automatically controlling voltage reactive optimal combinations; B, configuring and computing the power distribution reactive control optimal capacity. The method has the advantages that difficulty in voltage reactive control on current power distribution networks is comprehensively considered by the aid of the method, accordingly, the power distribution voltage and reactive and comprehensive control strategies and the reactive optimal capacity of the power distribution networks can be configured, and the power supply ability of the power distribution networks can be improved.
Description
Technical field
The present invention relates to GA for reactive power optimization technology, particularly relate to a kind of distribution reactive comprehensive control strategy and optimum capacity collocation method, be applicable to distribution network voltage and idle Comprehensive Control, optimum capacity configure and power distribution network energy efficiency evaluation.
Background technology
Control that conventional voltage is idle mostly is local and automatically controls, and by monitoring this ground voltage, active power, reactive power, regulates transformer gear or capacitor switch to make voltage and reactive power be positioned at acceptability limit.
At present, nearly all control method and the research of strategy are all only for substation level and above electrical network, little to the research of 10kV and following level Grid.Because distribution network automated, intelligence degree is at present far below power transmission network, monitoring point and controllable dot ratio low, voltage & var control is implemented to power distribution network and there is following difficult point:
1) power distribution network is multi-point and wide-ranging, and load type is various, and available operational monitoring data are less, and the mode amount of calculation that traditional the whole network unified Modeling calculates reaches, and algorithm is complicated, length consuming time.
2) equipment that running status is not good, because itself is uncontrollable or do not meet operation condition, can only improve its running status by the action of adjacent electrical network relevant device.As for No-load changer distribution transforming, during lower voltage limit, its voltage levvl can only be improved by circuit voltage regulator or main transformer pressure regulation.
3), after control command performs, due to the correlation between different electric pressure, regional power grid, easily there is the problem of attending to one thing and lose sight of another.Although lowering voltage as main transformer can by qualified for the distribution transforming Voltage Cortrol of Over High-Limit Voltage, the distribution transforming voltage that simultaneously original voltage may be caused qualified gets over lower limit.
4) device action should, according to local measurement information, also will, according to the coordination request of the superior and the subordinate's electrical network, easily cause device action to vibrate.As low-voltage platform area user's low voltage, voltage is raised in distribution transforming belonging to request, but may cause again the local Over High-Limit Voltage of distribution transforming after raising.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of distribution reactive comprehensive control strategy and optimum capacity collocation method, consider the difficult point that current power distribution network voltage & var control exists, to distribution voltage and idle control integrated control strategy, power distribution network is idle, and optimum capacity is configured, to improve the power supply capacity of power distribution network.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of distribution reactive comprehensive control strategy and optimum capacity collocation method, comprise the steps:
A, the optimum organization of voltage power-less is carried out to the step that automatically controls;
B, the optimum capacity of the idle control of distribution is configured to the step of calculating.
Wherein: when not considering power factor, described steps A comprises:
A1, voltage, idle all qualified, be failure to actuate;
A2, voltage are high, idle qualified, and gear subtracts one grade; When gear on earth, if having capacitor throwing, then cut a group capacitor, otherwise abandon;
High, the idle deficient benefit of A3, voltage, gear subtracts one grade; When gear on earth, then abandon;
Qualified, the idle deficient benefit of A4, voltage, if voltage is less than (U
b+ U
i)/2, then throw a group capacitor;
Low, the idle deficient benefit of A5, voltage, drops into capacitor; If capacitor is thrown entirely, gear rises one grade;
A6, voltage are low, idle qualified, and gear rises one grade; If gear, to top, is abandoned;
A7, voltage are low, without merits and demerits benefit, gear rises one grade; If gear, to top, is abandoned;
A8, voltage is qualified, mend, if voltage is greater than (U without merits and demerits
b+ U
i)/2, and have capacitor in throwing, then cut a group capacitor;
A9, voltage is high, mend without merits and demerits, if capacitor is in throwing, then cuts a group capacitor; If capacitor complete resection, then gear subtracts one grade.
Described step B comprises:
B1, be the maximum target function as preferred plan using year pure benefit, and set up the Mathematical Modeling of optimization with this;
The master control capacity of B2, power distribution network is Q
ckvar, if expense needed for every kilowatt of capacity is K unit, then total cost is KQ
cunit; As n service life, and when considering that rate of return on investment is i, being then equivalent to the annual expense NF for idle control is:
NF＝KQ
Ci(1+i)
n/[(1+i)
n-1]+Q
Cf+Q
CΔP
Cth
Wherein: f is the maintenance cost (unit: unit/kvar) of every kilowatt of capacity; T is year hours of operation (unit: h); H is total rate of electricity (unit: unit/kwh); Δ P
cfor every kilowatt of control capability power loss value (unit: kw/kvar).
Wherein, when considering power factor, described steps A comprises:
A1 ', voltage, idle all qualified, if power factor is greater than the power factor upper limit of setting, and capacitor is in throwing, then cut a group capacitor;
A2 ', voltage are high, idle qualified, and gear subtracts one grade;
High, the idle deficient benefit of A3 ', voltage, gear subtracts one grade;
Qualified, the idle deficient benefit of A4 ', voltage, if voltage is greater than (U
h+ U
l)/2, and power factor is less than setting power factor lower limit, then subtract one grade; If voltage is less than (U
h+ U
l)/2, and power factor is less than setting power factor lower limit, then throw a group capacitor;
Low, the idle deficient benefit of A5 ', voltage, throws a group capacitor; If capacitor is thrown entirely, gear rises one grade;
A6 ', voltage are low, idle qualified, and gear rises one grade;
A7 ', voltage are low, without merits and demerits benefit, gear rises one grade;
A8 ', voltage is qualified, mend without merits and demerits; If voltage is greater than (U
h+ U
l)/2, gear rises one grade; If voltage is greater than (U
h+ U
l)/2, and have capacitor throwing, cutting a group capacitor;
A9 ', voltage is high, mend without merits and demerits, if capacitor is in throwing, then cuts a group capacitor; Otherwise gear subtracts one grade.
Described step B comprises:
B1, be the maximum target function as preferred plan using year pure benefit, and set up the Mathematical Modeling of optimization with this;
The master control capacity of B2, power distribution network is Q
ckvar, if expense needed for every kilowatt of capacity is K unit, then total cost is KQ
cunit; As n service life, and when considering that rate of return on investment is i, being then equivalent to the annual expense NF for idle control is:
NF＝KQ
Ci(1+i)
n/[(1+i)
n-1]+Q
Cf+Q
CΔP
Cth
Wherein: f is the maintenance cost (unit: unit/kvar) of every kilowatt of capacity; T is year hours of operation (unit: h); H is total rate of electricity (unit: unit/kwh); Δ P
cfor every kilowatt of control capability power loss value (unit: kw/kvar).
Distribution reactive comprehensive control strategy provided by the present invention and optimum capacity collocation method, have the following advantages:
Adopt the present invention, by optimal reactive power allocation, reasonable disposition and throwing, cut distribution reactive power source, the distribution of OPTIMAL REACTIVE POWER power can be realized, reduce power distribution network running wastage, improve rate of qualified voltage, thus improve the power supply capacity of power distribution network.
Accompanying drawing explanation
Fig. 1 is that distribution voltage reactive comprehensive controls nine-zone graph;
Fig. 2 is the optimum capacity configuration computing block diagram of the idle control of distribution.
Embodiment
Below in conjunction with accompanying drawing and embodiments of the invention, distribution reactive comprehensive control strategy of the present invention and optimum capacity collocation method are described in further detail.
Distribution voltage of the present invention and idle control integrated control strategy, power distribution network is idle, and principle that optimum capacity collocation method follows is:
1) first regulate idle, rear adjustment voltage.Reactive balance is delivery of electrical energy, conversion and the basic condition that normally runs of maintenance electric equipment.Simultaneously from reactive voltage characteristic curve, during load variations, in order to maintain reactive power equilibrium, new reactive balance point will inevitably be formed, cause equipment working voltage to change.Therefore, distribution network voltage is idle, and cooperation control should first regulate idle, rear adjustment voltage.
2) idlely to judge from top to bottom, control from bottom to top.The unsuitable long-distance sand transport of reactive power, for the distribution of reactive power, should carry out according to the principle of in-situ balancing, dispersion compensation, reduces the reactive power that reactive power consumption point absorbs from higher level's electrical network as far as possible, reduces idle flowing in the line.Therefore, idlely should to judge from top to bottom.If higher level's electrical network has the demand of reactive power compensation, first should check subordinate's electric network reactive-load whether in-situ balancing, when subordinate's electrical network cannot meet compensate require, then form the local control command compensated.And the execution of control command should be carried out step by step, so can meet local reactive requirement from bottom to top, idle flowing in electrical network can be reduced again, reduce network loss to greatest extent.
3) voltage judges from bottom to top, controls from top to bottom.Power distribution network low-voltage customer end cannot realize local pressure regulation, and the action of higher level's regulator can only be relied on to realize.The regional on-load voltage regulation distribution transforming of current majority and circuit voltage regulator negligible amounts.Distribution transforming pressure regulation mainly relies on the action of main transformer tap, and the adjustment that namely in 10kV circuit, most voltage does not conform to lattice point all needs upwards to apply for step by step.Therefore, should judge that voltage is the need of adjustment from bottom to top step by step.When carrying out Voltage Cortrol, the action of higher level's voltage adjusting device is comparatively large to subordinate equipment voltage influence, adjusts wide; And subordinate's voltage adjusting device action is very little to higher level equipment voltage influence, adjustment face is narrow, therefore should perform pressure regulation instruction step by step from top to bottom.
Fig. 1 is that distribution voltage reactive comprehensive controls nine-zone graph.Distribution voltage of the present invention and reactive comprehensive control method as follows:
As shown in Figure 1, the operating voltage of distribution, idle parameter can be divided into 0 ~ 8 totally nine regions.Nine-zone graph take voltage as ordinate, and reactive power is abscissa.U in figure
h, U
lbe respectively set distribution voltage upper limit setting value and lower limit setting value, Q
h, Q
lbe then upper limit setting value and the lower limit setting value of delayed reactive power.
The gear ascending, descending being adjusted to distribution transformer of distribution voltage, the control of reactive power is divided into grouping to throw, cut the power capacitor of fixed capacity.To this, the optimum organization of voltage power-less controls to adopt following control method automatically, comprises (when not considering power factor):
Step 11: voltage, idle all qualified, is failure to actuate.
Step 12: voltage is high, idle qualified, and gear subtracts one grade.When gear on earth, if having capacitor throwing, then cut a group capacitor, otherwise abandon.
Here, described throwing, the concept of cutting, represent the on-off (switch, contactor etc.) of control device in reactive power compensation technology; Represent that the operation dropping into part capacitance (by electric capacity place in circuit) or cut-out capacitance (electric capacity and circuit being disconnected) is made in the change along with circuit power rate, its effect is equivalent to operating power Power Factor Controller.
Step 13: high, the idle deficient benefit of voltage, gear subtracts one grade (gear on earth, is abandoned).
Step 14: qualified, the idle deficient benefit of voltage, if voltage is less than (U
h+ U
l)/2, then throw a group capacitor.
Step 15: low, the idle deficient benefit of voltage, drops into capacitor (if capacitor is thrown entirely, gear rises a grade).
Step 16: voltage is low, idle qualified, gear rises one grade (gear is then abandoned to top).
Step 17: voltage is low, without merits and demerits benefit, gear rises one grade (gear is then abandoned to top).
Step 18: voltage is qualified, mend, if voltage is greater than (U without merits and demerits
h+ U
l)/2, and have capacitor in throwing, then cut a group capacitor.
Step 19: voltage is high, mend without merits and demerits, if capacitor is in throwing, then cuts a group capacitor (capacitor complete resection, gear subtracts a grade).
If consideration power factor, then distribution voltage reactive comprehensive control method, can adopt following steps:
Step 11 ': voltage, idle all qualified, if power factor is greater than the power factor upper limit of setting, and capacitor is in throwing, then cut a group capacitor (otherwise not controlling).
Step 12 ': voltage is high, idle qualified, and gear subtracts one grade (gear on earth, if having capacitor in throwing, is then cut a group capacitor, otherwise abandoned).
Step 13 ': high, the idle deficient benefit of voltage, gear subtracts one grade (gear on earth, is abandoned).
Step 14 ': qualified, the idle deficient benefit of voltage, if voltage is greater than (U
h+ U
l)/2, and power factor is less than setting power factor lower limit, then subtract one grade (if voltage is less than (U
h+ U
l)/2, and power factor is less than setting power factor lower limit, then throw a group capacitor).
Step 15 ': low, the idle deficient benefit of voltage, throw a group capacitor (if capacitor is thrown entirely, gear rises a grade).
Step 16 ': voltage is low, idle qualified, and gear rises one grade (gear is then abandoned to top).
Step 17 ': voltage is low, without merits and demerits benefit, gear rises one grade (gear is then abandoned to top).
Step 18 ': voltage is qualified, mend, if voltage is greater than (U without merits and demerits
h+ U
l)/2, gear rises one grade (if voltage is greater than (U
h+ U
l)/2, and have capacitor throwing, cutting a group capacitor).
Step 19 ': voltage is high, mend without merits and demerits, if capacitor is in throwing, then cuts a group capacitor (otherwise gear subtracts a grade, gear is then abandoned on earth).
Fig. 2 is the optimum capacity configuration computing block diagram of the idle control of distribution.The best configuration process of distribution of the present invention is idle control capability, comprises the steps:
Step 21: in order to determine the preferred plan of the idle control of power distribution network, is the maximum target function as preferred plan using year pure benefit, and sets up the Mathematical Modeling of optimization with this.
Step 22: the master control capacity of known power distribution network is Q
c(kvar), if expense needed for every kilowatt of capacity is K unit, then total cost is KQ
cunit.As n service life, and when considering that rate of return on investment is i, being then equivalent to the annual expense NF for idle control is:
NF＝KQ
Ci(1+i)
n/[(1+i)
n-1]+Q
Cf+Q
CΔP
Cth
Wherein: f is the maintenance cost (unit: unit/kvar) of every kilowatt of capacity; T is year hours of operation (unit: h); H is total rate of electricity (unit: unit/kwh); Δ P
cfor every kilowatt of control capability power loss value (unit: kw/kvar).
When seeking optimum control scheme, the mode that multi-scheme can be adopted to compare is carried out, and the initial scheme selected is the scheme first each POL being configured to control capability, that is:
Q
C＝Q
C1，Q
C2，...，Q
CN
The control capability of node 1 can be removed, that is:
Q
C＝0，Q
C2，...，Q
CN
Can obtain each alternative successively, and a kth scheme control capability should be:
Q
c=0...0 (k individual 0), Q
c (k=1), Q
c (k=2)..., Q
n
According to said method obtain N number of alternative altogether, and calculate respectively the Controlling vertex number of each scheme, control capability, annual cost, the Spring Festival holidays electricity charge, year net earnings and under this control program power distribution network outlet power factor value.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.
Claims (5)
1. distribution reactive comprehensive control strategy and an optimum capacity collocation method, is characterized in that, comprise the steps:
A, the optimum organization of voltage power-less is carried out to the step that automatically controls;
B, the optimum capacity of the idle control of distribution is configured to the step of calculating.
2. distribution reactive comprehensive control strategy according to claim 1 and optimum capacity collocation method, is characterized in that, when not considering power factor, described steps A comprises:
A1, voltage, idle all qualified, be failure to actuate;
A2, voltage are high, idle qualified, and gear subtracts one grade; When gear on earth, if having capacitor throwing, then cut a group capacitor, otherwise abandon;
High, the idle deficient benefit of A3, voltage, gear subtracts one grade; When gear on earth, then abandon;
Qualified, the idle deficient benefit of A4, voltage, if voltage is less than (U
b+ U
i)/2, then throw a group capacitor;
Low, the idle deficient benefit of A5, voltage, drops into capacitor; If capacitor is thrown entirely, gear rises one grade;
A6, voltage are low, idle qualified, and gear rises one grade; If gear, to top, is abandoned;
A7, voltage are low, without merits and demerits benefit, gear rises one grade; If gear, to top, is abandoned;
A8, voltage is qualified, mend, if voltage is greater than (U without merits and demerits
b+ U
i)/2, and have capacitor in throwing, then cut a group capacitor;
A9, voltage is high, mend without merits and demerits, if capacitor is in throwing, then cuts a group capacitor; If capacitor complete resection, then gear subtracts one grade.
3. distribution reactive comprehensive control strategy according to claim 1 and optimum capacity collocation method, is characterized in that, described step B comprises:
B1, be the maximum target function as preferred plan using year pure benefit, and set up the Mathematical Modeling of optimization with this;
The master control capacity of B2, power distribution network is Q
c kvarif expense needed for every kilowatt of capacity is K unit, then total cost is KQ
cunit; As n service life, and when considering that rate of return on investment is i, being then equivalent to the annual expense NF for idle control is:
NF＝KQ
ci(1+i)
n/[(1+i)
n-1]+Q
cf+Q
cΔP
cth
Wherein: f is the maintenance cost (unit: unit/kvar) of every kilowatt of capacity; T is year hours of operation (unit: h); H is total rate of electricity (unit: unit/kwh); Δ P
cfor every kilowatt of control capability power loss value (unit: kw/kvar).
4. distribution reactive comprehensive control strategy according to claim 1 and optimum capacity collocation method, is characterized in that, when considering power factor, described steps A comprises:
A1 ', voltage, idle all qualified, if power factor is greater than the power factor upper limit of setting, and capacitor is in throwing, then cut a group capacitor;
A2 ', voltage are high, idle qualified, and gear subtracts one grade;
High, the idle deficient benefit of A3 ', voltage, gear subtracts one grade;
Qualified, the idle deficient benefit of A4 ', voltage, if voltage is greater than (U
h+ U
l)/2, and power factor is less than setting power factor lower limit, then subtract one grade; If voltage is less than (U
h+ U
l)/2, and power factor is less than setting power factor lower limit, then throw a group capacitor;
Low, the idle deficient benefit of A5 ', voltage, throws a group capacitor; If capacitor is thrown entirely, gear rises one grade;
A6 ', voltage are low, idle qualified, and gear rises one grade;
A7 ', voltage are low, without merits and demerits benefit, gear rises one grade;
A8 ', voltage is qualified, mend without merits and demerits; If voltage is greater than (U
h+ U
l)/2, gear rises one grade; If voltage is greater than (U
h+ U
l)/2, and have capacitor throwing, cutting a group capacitor;
A9 ', voltage is high, mend without merits and demerits, if capacitor is in throwing, then cuts a group capacitor; Otherwise gear subtracts one grade.
5. distribution reactive comprehensive control strategy according to claim 1 and optimum capacity collocation method, is characterized in that, described step B comprises:
B1, be the maximum target function as preferred plan using year pure benefit, and set up the Mathematical Modeling of optimization with this;
The master control capacity of B2, power distribution network is Q
c kvarif expense needed for every kilowatt of capacity is K unit, then total cost is KQ
cunit; As n service life, and when considering that rate of return on investment is i, being then equivalent to the annual expense NF for idle control is:
NF＝KQ
ci(1+i)
n/[(1+i)
n-1]+Q
cf+Q
cΔP
cth
Wherein: f is the maintenance cost (unit: unit/kvar) of every kilowatt of capacity; T is year hours of operation (unit: h); H is total rate of electricity (unit: unit/kwh); Δ P
cfor every kilowatt of control capability power loss value (unit: kw/kvar).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| Publication number | Publication date |
|---|---|
| CN104362641B (en) | 2017-12-12 |
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