CN107482641A - With the SVG control methods of intelligent capacitor group cooperating - Google Patents
With the SVG control methods of intelligent capacitor group cooperating Download PDFInfo
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- CN107482641A CN107482641A CN201710142996.3A CN201710142996A CN107482641A CN 107482641 A CN107482641 A CN 107482641A CN 201710142996 A CN201710142996 A CN 201710142996A CN 107482641 A CN107482641 A CN 107482641A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—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
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
-
- 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
- Y02E40/10—Flexible AC transmission systems [FACTS]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Electrical Variables (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The present invention relates to a kind of and intelligent capacitor group cooperating SVG control methods, by in the low-voltage platform area low-voltage circuit head end access in parallel intelligent capacitor group and the SVG, using the SVG control methods with intelligent capacitor group cooperating, SVG compensate low capacity reactive load power, intelligent capacitor be operated in can excess temperature switch-capacitor switching scheme.The SVG of low capacity can be used, taiwan area low-voltage circuit power factor bust problem caused by irredundant electric capacity when intelligent capacitor cuts off excess temperature electric capacity can be effectively avoided in the case where increase is compared with scalp cost, while further increase the life-span of intelligent capacitor.
Description
Technical field
The present invention relates to electronic power convertor technical field, and conjunction work is assembled with intelligent capacitor more particularly to a kind of
The SVG control methods of work.
Background technology
With non-linear electrical equipment in power system, particularly power electronic equipment (such as：Rectifier, frequency control dress
Put) application it is increasingly extensive, the influence to power network is also increasing.Due to most of power electronic equipment power factors compared with
It is low, substantial amounts of reactive power need to be consumed during work, not only increase grid line loss, fast-changing reactive power also results in
Voltage ripple of power network is violent, so as to have influence on the safe operation of power network.In the low-voltage platform area actual motion management of power distribution network,
Either special change taiwan area or public change taiwan area, have strict requirements to the power factor of taiwan area low-voltage circuit head end, with
Reduce the influence of the taiwan area Load on Electric Power Grid.Power factor is improved to meet the requirement of low-voltage platform area operational management, its essence is
Administer reactive power caused by taiwan area low-voltage circuit load.
The reactive power of low-voltage platform area is administered more using in the side of low-voltage circuit head end parallel connection grouping switching capacitor at present
Formula.Grouping switching capacitor is static reactive power compensating equipment, point of traditional grouping switching capacitor based on combination switch
Group electric capacity, in capacitor switching, dash current is excessive, causes that device lifetime is short, faults frequent.It is directed to legacy packets switching electricity
The deficiency of container, intelligent capacitor are controlled using intelligent chip, are realized switch operating passing zero, are eliminated the impact of capacitor switching
Electric current, so as to improve the service life of device.Intelligent capacitor has turned into the first choice of static reactive power compensation, gradually takes
For traditional reactive power compensator.
After the dash current of capacitor switching is eliminated, intelligent capacitor can greatly increase service life, and confining device
The further factor of service life is that the capacitor high temperature put into for a long time causes capacitor to damage.For protective condenser, increase electricity
In the container life-span, the product of capacitor producer is more using the control strategy of excess temperature switch-capacitor at present, that is, the electric capacity excess temperature put into
When, cut off the electric capacity and put into the electric capacity of identical capacity.The premise of the realization of excess temperature switch-capacitor function is that intelligent capacitor is deposited
In redundant capacitor, i.e., with the capacity such as excess temperature electric capacity and the electric capacity that does not put into.When irredundant electric capacity, nothing after the excision of excess temperature electric capacity
The electric capacity input of replacement, low-voltage platform area low-voltage circuit reactive power mutation, power factor bust will be caused.
Static reacance generator (Static Var Generator, SVG) is dynamic reactive power compensation equipment, can be mended
Fast-changing reactive power is repaid, while also possesses the function of compensation three-phase load unbalance.But due to the SVG valencys of Large Copacity
Lattice are high, are also not suitable for that compensation low-voltage platform area reactive power is used alone at present.
The content of the invention
Based on this, it is necessary to provide it is a kind of with intelligent capacitor group cooperating SVG control methods, effectively using compared with
The SVG of low capacity, intelligent capacitor group is set to work in the switching scheme that redundant capacitor be present, so as to avoid taiwan area low-voltage circuit
The power factor bust problem caused by irredundant electric capacity when intelligent capacitor cuts off excess temperature electric capacity.
A kind of and SVG control methods of intelligent capacitor group cooperating, including step：
All switching scheme combinations of target power factor PF, intelligent capacitor group are obtained, according to intelligent capacitor compensated stage
Number setting need to compensate total reactive power section；
Based on vector detection load positive sequence active-power PLoadAnd reactive power QLoad, calculating reach target power because
Total reactive power value Q that SVG need to compensate with intelligent capacitor during number PF valuesZ, calculation formula such as formula：
According to the Q for calculating gainedZ, judge its place section, select the compensation capacity Q of intelligent capacitorC, and calculate SVG
Reactive-load compensation instruction QSVG, calculation formula such as formula：
QSVG=k (QZ-QC)
Wherein, k is SVG reactive power compensation coefficient.
The above-mentioned and SVG control methods of intelligent capacitor group cooperating, SVG and intelligence are calculated according to target power factor
Can the total reactive power that need to compensate of capacitor bank, reactive power section residing for the interpretation calculated value simultaneously calculates SVG idle benefit
Instruction is repaid, makes the reactive load power of SVG compensation certain capacities, while intelligent capacitor group is the scheme of redundant capacitor to be present
Carry out switching.The SVG control methods make the intelligent capacitor of matched work always work at can excess temperature switch-capacitor throwing
In butt case, so as to avoid taiwan area low-voltage circuit work(caused by irredundant electric capacity when intelligent capacitor cuts off excess temperature electric capacity
Rate factor bust problem.
Brief description of the drawings
Fig. 1 is the reactive power compensation system structure diagram of an example；
Fig. 2 is the SVG control method flow charts with intelligent capacitor group cooperating of the present invention.
Embodiment
The embodiment with the SVG control methods of intelligent capacitor group cooperating of the present invention is illustrated below in conjunction with the accompanying drawings.
With reference to figure 1, Fig. 1 is the reactive power compensation system structure diagram of an example, is contained in figure：1 10kV/400V
Distribution transformer, 1 set of intelligent capacitor group, 1 SVG, low-voltage circuit and taiwan area load, wherein reactive power compensation system is by 1
Cover grouping switching capacitor and 1 SVG composition.
In one embodiment, the distribution transformer low-pressure side (400V) connects the low-voltage circuit；The intelligent capacitor
Device group is in parallel to access the low-voltage circuit head end, and the access point voltage is vC；The current transformer of the intelligent capacitor group
(CT_C) intelligent capacitor group access point downstream electric current i described in Series detectorsLoadC；The SVG is in parallel to access the low-voltage circuit
Head end (access point must be in the downstream of the CT_C), the access point voltage are vSVG；Current transformer (the CT_ of the SVG
SVG) intelligent capacitor group access point downstream electric current i described in Series detectorsLoad；All load collection of the low-voltage circuit access
Always it is the load, wherein the circuit head end is equivalent to a line impedance, its value to the line impedance between the load
For zline。
With reference to figure 2, Fig. 2 is the SVG control method flow charts with intelligent capacitor group cooperating of the present invention, including：
Step (1)：Obtain target power factor PF (Power Factor), all switching scheme groups of intelligent capacitor group
Close, total reactive power section need to be compensated according to the setting of intelligent capacitor offset phases；
In one embodiment, the step (1) can specifically include as follows：
The SVG is by reading the target power factor PF manually set, the intelligent capacitor group institute being manually entered
There is the combination of switching scheme, and total reactive power section need to be compensated according to intelligent capacitor offset phases setting, as rear
The data basis that face step is calculated and judged.
Step (2)：Based on vector detection load positive sequence active-power PLoadAnd reactive power QLoad, calculate and reach mesh
Total reactive power value Q that SVG need to compensate with intelligent capacitor when marking power factor PF valuesZ, calculation formula such as formula (3)：
In one embodiment, the step (2) can specifically include as follows：
Line translation is entered to the load current and the SVG access points voltage using fundamental frequency dq conversion, and carries out low pass filtered
Ripple, obtain the d axle DC components I of the load currentLoad_d, q axle DC components ILoad_qWith the d of the SVG access points voltage
Axle DC component VSVG_d, q axle DC components VSVG_q；The load positive sequence active-power P is calculated in real timeLoadAnd reactive power
QLoad, calculation formula such as formula (4)：
Total idle work(that the SVG need to compensate with intelligent capacitor when reaching target power factor PF values is calculated in real time
Rate value QZ, calculation formula such as formula (3).
Step (3)：According to the Q for calculating gainedZ, judge its place section, select the compensation capacity Q of intelligent capacitorC, and
Calculate SVG reactive-load compensation instruction QSVG, calculation formula such as formula (5).
QSVG=k (QZ-QC) (5)
Wherein, k is the reactive power compensation coefficient of the SVG.Coefficient setting allows for the SVG and the intelligence
Can capacitor measurement and result of calculation the problem of there is some difference, to avoid intelligent capacitor from being failure to actuate, the SVG and institute
Q should be slightly less than by stating total reactive power of intelligent capacitor compensationZ, therefore need to be multiplied by compensation system during reactive power compensation instruction calculating
Number k (is less than 0.9~1, need to be finely adjusted as the case may be).
In one embodiment, the step (3) can specifically include as follows：
Total reactive power section need to be compensated according to step (1) setting, judged specifically in which section；According to judgement
The section of gained, it may be determined that the compensation capacity Q of the intelligent capacitorC；Calculate the idle benefit of the SVG in real time according to formula (5)
Repay instruction QSVG, the compensating instruction produces the control pulse of the SVG switching devices after being modulated, with realize the SVG with
Reactive power compensation is carried out with the compensating instruction.
The technical scheme of above-described embodiment, by the low-voltage platform area low-voltage circuit head end access intelligent capacitor in parallel
Device group and the SVG, using the SVG control methods with intelligent capacitor group cooperating, the loads of SVG compensation low capacities without
Work(power, intelligent capacitor be operated in can excess temperature switch-capacitor switching scheme.Due to the SVG only with low capacity, can increase
Because of irredundant electric capacity when avoiding taiwan area low-voltage circuit in the case of adding compared with scalp cost because of intelligent capacitor excision excess temperature electric capacity
Caused power factor bust problem, while further increase the life-span of intelligent capacitor.
In order to further illustrate the control method of the invention put forward, a specific embodiment is described below：
Using system architecture as shown in Figure 1, wherein intelligent capacitor group is by two online benefits of the intelligent capacitor with model
Repay, each one of each intelligent capacitor electric capacity containing 10kVar and 5kVar, target power factor is set to 0.98 (low-voltage platform area power
Factor command is 0.97), using the strategy of excess temperature switch-capacitor.
Understood for the intelligent capacitor group parameter, 7 kinds of compensation capacities of presence of intelligent capacitor and 16 kinds of switching sides
Case, as shown in table 1, capacitor status " 0 " represents not throw wherein in form, and " 1 " represents input.From table 1, except compensation is held
Measure outside for 25kVar and 30kVar, used electric capacity has redundant capacitor in the scheme of remaining compensation capacity, you can realize
Excess temperature switch-capacitor.
The intelligent capacitor group compensation capacity of table 1 and switching scheme
As the supplement of intelligent capacitor, SVG reactive-load compensation limit value should be arranged on 5kVar, set SVG target
Power factor is 0.98.
The positive sequence active power of load is 40kW, reactive power 20kVar, power factor 0.894.
In the present embodiment, it is as follows to propose control method processing by the present invention：
Step (1)：Obtain target power factor PF=0.98；Obtain the combination of intelligent capacitor group switching scheme；According to intelligence
The series setting of energy capacitor compensation need to compensate total reactive power section：[0,5kVar), [5kVar, 10kVar), [10kVar,
15kVar), [15kVar, 20kVar), [20kVar, 25kVar), [25kVar, 30kVar) and [30kVar, 35kVar]；
Step (2)：Detection load positive sequence active-power PLoad=110kW and reactive power QLoad=20kVar, according to formula
(3) Q is calculatedZ=11.9kVar；
Step (3)：According to the Q for calculating gainedZ, judge its section for [10,15kVar), select the benefit of intelligent capacitor
Repay capacity QC=10kVar, and Q is calculated according to formula (5)SVG=1.82kVar, wherein k take 0.96.
Final SVG compensation 1.82kVar is understood by calculating, intelligent capacitor compensation 10kVar, low-voltage circuit head end power
Factor is：0.9797.
In the above-mentioned technical characteristic illustrated with the embodiment of the SVG control methods of intelligent capacitor group cooperating and its
Beneficial effect suitable for the embodiment of reactive power compensation system, hereby give notice that.
Embodiment described above only expresses embodiments of the present invention, and its description is more specific and detailed, but can not
Therefore it is construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art,
Without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection model of the present invention
Enclose.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (4)
1. a kind of and intelligent capacitor group cooperating SVG control methods, it is characterised in that including step：
Target power factor PF and all switching scheme combinations of intelligent capacitor group are obtained, according to intelligent capacitor group offset phases
Setting need to compensate total reactive power section；
Based on vector detection load positive sequence active-power PLoadAnd reactive power QLoad, calculate and reach target power factor PF
Total reactive power value Q that SVG need to compensate with intelligent capacitor group during valueZ, calculation formula such as formula：
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According to the reactive power value Q for calculating gainedZ, judge section where it, select the compensation capacity Q of intelligent capacitor groupC, and
Calculate SVG reactive-load compensation instruction QSVG, calculation formula such as formula：
QSVG=k (QZ-QC)
Wherein, k is the reactive power compensation coefficient of the SVG.
2. according to claim 1 and intelligent capacitor group cooperating SVG control methods, it is characterised in that
Line translation is entered to load current and SVG access point voltages using fundamental frequency dq conversion, and carries out LPF, is obtained described negative
The d axle DC components I of charged currentLoad_d, q axle DC components ILoad_qWith the d axle DC components of the SVG access points voltage
VSVG_d, q axle DC components VSVG_q；The load positive sequence active-power P is calculated in real timeLoadAnd reactive power QLoad, calculation formula
Such as formula：
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3. according to claim 2 and intelligent capacitor group cooperating SVG control methods, it is characterised in that
Judge reactive power value QZSpecifically in which section that need to compensate total reactive power section, according to judging gained
Section, determine the compensation capacity Q of the intelligent capacitor groupC；Calculate the reactive-load compensation instruction Q of the SVGSVG, the compensation refers to
Order produces the control pulse of the SVG switching devices after being modulated.
4. according to claim 3 and intelligent capacitor group cooperating SVG control methods, it is characterised in that
Calculate the reactive-load compensation instruction Q of the SVGSVGWhen, the value of reactive power compensation coefficient k is to be less than 1 more than 0.9.
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| CN201710142996.3A CN107482641B (en) | 2017-03-10 | 2017-03-10 | SVG control method working with intelligent capacitor bank |
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| CN201710142996.3A CN107482641B (en) | 2017-03-10 | 2017-03-10 | SVG control method working with intelligent capacitor bank |
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| CN109524966A (en) * | 2019-01-04 | 2019-03-26 | 江苏谷峰电力科技股份有限公司 | A kind of New Fusion microgrid filter benefit device |
| CN110516912A (en) * | 2019-07-24 | 2019-11-29 | 长沙恒电聚能电子科技有限公司 | A kind of power distribution station family becomes the recognition methods of relationship |
| CN110707726A (en) * | 2019-12-02 | 2020-01-17 | 国网山东省电力公司电力科学研究院 | Multilayer reactive power compensation method based on large-scale offshore wind power output system |
| CN115347581A (en) * | 2022-10-17 | 2022-11-15 | 石家庄科林物联网科技有限公司 | Hierarchical stepping reactive compensation regulation and control method and system for power distribution area |
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| CN115347581A (en) * | 2022-10-17 | 2022-11-15 | 石家庄科林物联网科技有限公司 | Hierarchical stepping reactive compensation regulation and control method and system for power distribution area |
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|---|---|
| CN107482641B (en) | 2021-01-08 |
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