CN106329533A - Series compensation voltage minimization-based dual-power source power distribution looped network power flow control method - Google Patents
Series compensation voltage minimization-based dual-power source power distribution looped network power flow control method Download PDFInfo
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- CN106329533A CN106329533A CN201610839503.7A CN201610839503A CN106329533A CN 106329533 A CN106329533 A CN 106329533A CN 201610839503 A CN201610839503 A CN 201610839503A CN 106329533 A CN106329533 A CN 106329533A
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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Abstract
The present invention discloses a series compensation voltage minimization-based dual-power source power distribution looped network power flow control method. The method includes the following steps that: 1, a dual-power source power distribution looped network power flow control method is constructed; 2, a series compensation voltage minimization-based power flow optimal control strategy is put forward; and 3, inequality constraint conditions are constructed. According to the problem of the unevenness of the output power of two ends of a dual-power source power distribution looped network, a unified power flow controller is used to regulate the output power; the power flow control law of the dual-power source power distribution looped network is analyzed, and the power flow optimal control strategy with load node voltage deviation and loop closing feeder ling power output limits adopted as constraints and series compensation voltage minimization adopted as an objective. As indicated by simulation results, the strategy can balance the active power output of the two sides of the dual-power source power distribution looped network to a certain extent according to an expected goal with constraint conditions satisfied.
Description
Technical field
The present invention relates to a kind of distribution looped network optimal power flow control method based on THE UPFC, particularly to one
Plant and mend, based on string, the dual power supply distribution looped network flow control method that voltage is minimum.
Background technology
Power supply reliability is to weigh the basic index of electric network performance.Traditional power supply reliability only focuses on power failure for a long time
(power off time is more than 3min), along with socioeconomic development, the most will have a power failure in short-term (power off time is less than 3min) is received
Enter power supply reliability intangibles measurement system.How to solve power cut problem, raising power supply reliability in short-term, become intelligent distribution network and grind
The emphasis studied carefully.Distribution feeder fault is one of principal element affecting power supply reliability.Conventional electrical distribution net employing closed loop design,
The power supply mode of open loop operation, even if using the means such as feeder automation still cannot avoid having a power failure in short-term.U.S. Fu Luoli at present
The some electrical power company in the area such as Dazhou City, Singapore, Japan, Hong Kong, Taiwan has used single supply feeder line ring network power supply mode, logical
Cross the protective measures such as outfit guide wire is differential and quickly excise fault, to some extent solve power cut problem in short-term, but still
The power failure that the stoppage in transit such as bus, main transformer causes cannot be avoided.
Different bus or electric substation's feeder line is used to constitute looped network (abbreviation duplicate supply looped network) powering mode reliability the highest, but
Control device is complicated.Traditional employing adjusts the method such as load tap changer, reactive power compensator regulation feeder line exit potential, right
Power flow of ring net is controlled, but the factors such as modulated number of times, seriality, capacity limit, it is difficult to ensure power flowcontrol effect.
THE UPFC (UPFC) has powerful power flowcontrol function, and its applied research is mainly for improving transmission of electricity
Net ability to transmit electricity and system stability；Being limited by economy, UPFC applied research in power distribution network is relatively fewer.The most all
It is to combine power system demand its internal control method is conducted a research, fails to organically combine system with device.Based on UPFC
There is not been reported in the research of the dual power supply distribution looped network power flowcontrol technology of device.Owing to dual power supply distribution looped network is by both end voltage
The many factors impacts such as difference, power load distributing, system impedance, it is understood that there may be bigger circulating power, cause double-end feed to be exerted oneself not
Uniformly inverse probability even occurs, it is necessary to take control measure.
Summary of the invention
It is an object of the invention to: in order to overcome the deficiencies in the prior art, the present invention provides a kind of and mends based on string
The dual power supply distribution looped network flow control method that voltage is minimum, utilizes UPFC to be controlled distribution power flow of ring net, by distributor track
Net power flow regulating requires to combine with UPFC output voltage, ensures that Unified Power Flow controls on the premise of meeting power regulation requirements
The economy of device.
The technical solution adopted in the present invention is: a kind of dual power supply distribution looped network power flowcontrol mending voltage minimum based on string
Method, comprises the steps:
Step one: structure dual power supply distribution looped network flow control method；
Step 2: propose the optimal power flow control strategy minimum based on series compensating voltage；
Step 3: build inequality constraints condition.
In the present invention, the structure dual power supply distribution looped network flow control method in described step one is as follows,
Making the outfan in dual power supply distribution looped network is M, then the complex power of M end output is:
Wherein,For the summation of main feed looped network impedance,ForThe duty values such as the branched line,It isSection main feed looped network
Line impedance,、It is respectivelyEnd withThe busbar voltage of end,For branch's number；
At one end (assuming thatEnd) inject series compensating voltage, then the complex power of this end output is:
When adjusting string and mending voltage, it is assumed that two ends busbar voltage is unaffected, from above formulaEnd series compensating voltage can be straight
Connect the output controlling this end complex power, it may be assumed that
End active power variable quantityWith series compensating voltageBetween relation be:
For convenience of representing, order:
Then have:
WhereinForVertical component,ForHorizontal component,ForEnd active power variable quantity,、For being
Number；As can be seen here, by adjustingWithJust can be adjusted flexiblyEnd active power output.In running process
In, traffic department can be according to the actual setting of exerting oneself of double-end feed, on the premise of eliminating inverse probability, consider two ends electricity
Source capacity, realizes the equalization that feeder line is exerted oneself as far as possible, to improve running efficiency of system.
In the present invention, the optimal power flow control strategy based on series compensating voltage minimum of the proposition in described step 2
For, utilize THE UPFC that distribution power flow of ring net is controlled, distribution looped network power flow regulating is required and Unified Power Flow
Controller output voltage combines, and ensures the economy of THE UPFC on the premise of meeting power regulation requirements as far as possible
Property；Wherein its part in series of THE UPFC output series compensating voltage, the idle and active power of control system, idle
The exchange of power can complete self；Parallel connection part, as current source, mainly balances DC bus-bar voltage, exports for part in series
Active power provides and supports；Compensate power one timing, on the premise of realizing compensating voltage minimum, the coupling of part in series can be saved
Close transformator, directly carry out series compensation, to ensure the economy of THE UPFC；
From the foregoing it will be appreciated thatEnd power adjustmentWithWithThere is relation:
In power adjustmentOne timing is equality constraint；Optimization aim isMinimum, usesRepresent then have:
WhereinFor Lagrange object function,For Lagrangian；
By,,Solve:
Considering static load voltage characteristic, correction further to optimizing control models obtains recurrence formula, it is assumed that static load electricity
Pressure characteristic coefficient is, then have:
WhereinFor the terminal voltage before regulation.
It should be understood that
A. this Controlling model is only with the single-end information amount of THE UPFC installation place, and data acquisition is convenient；
B. single-phase power flowcontrol when this model is applicable to power distribution network three-phase imbalance.
In the present invention, the structure inequality constraints condition of described step 3 kind, under meeting power equation constraints,
Also need to meet following inequality constraints condition:
Wherein,The each load bus voltage in position,、It is respectively load bus voltage bound；、It is respectively
End,The apparent energy of end output,、It is respectivelyEnd,The apparent energy limit of end output.
Use after technique scheme, the invention have the benefit that one that the present invention provides mends voltage based on string
Little dual power supply distribution looped network flow control method, compared to traditional method, the present invention tentatively proposes to utilize UPFC to distributor track
The method that net trend is controlled, requires to combine with UPFC output voltage by distribution looped network power flow regulating, adjusts meeting power
Joint ensures the economy of THE UPFC as far as possible on the premise of requiring.
Accompanying drawing explanation
Fig. 1 dual power supply distribution looped network power flowcontrol equivalent circuit；
Fig. 2 THE UPFC realizes schematic diagram.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is further described.
The technical solution used in the present invention is: a kind of dual power supply distribution looped network power flowcontrol side mending voltage minimum based on string
Method.Comprise the steps:
Step one: structure dual power supply distribution looped network flow control method；
The double-end feed caused for the relatively systemic circulation power that solves existing for dual power supply power distribution network is exerted oneself and uneven is even gone out
Existing inverse probability, must take control measure, will set up phantom based on PSCAD below and carry out calculating reason emulation this control mould of proof
The effectiveness of type.As it is shown in figure 1, model parameter is:,,,,,,,,,,,,,,,；
Static load voltage characteristic coefficient；For preferably verifying the impact on power flowcontrol of the two ends system impedance difference, takeThe internal impedance of end is 0, obtains power difference according to the reality of UPFC installation place is meritorious with presetting to exert oneself, substitutes into formula
In obtain UPFC series compensating voltage, as emulation mould
The voltage input of controllable electric power in type；In order to effectively describe the problem, use unified network model, be divided into 2 kinds of situation checking merits
Rate regulating effect；Set,, during operation with closed ringMeritorious the exerting oneself of end is 0.611
MW,End is meritorious exerts oneself as 3.113MW, two ends are meritorious exert oneself the most unbalanced.
In dual power supply distribution looped network as shown in Figure 1, the complex power of M end output is:
Wherein,For the summation of main feed looped network impedance,ForThe duty values such as the branched line,It isSection main feed looped network
Line impedance,、It is respectivelyEnd withThe busbar voltage of end,For branch's number；
At one end (assuming thatEnd) inject series compensating voltage, then the complex power of this end output is:
When adjusting string and mending voltage, it is assumed that two ends busbar voltage is unaffected, from above formulaEnd series compensating voltage can be straight
Connect the output controlling this end complex power, it may be assumed that
End active power variable quantityWith series compensating voltageBetween relation be:
For convenience of representing, order:
Then have:
WhereinForVertical component,ForHorizontal component,ForEnd active power variable quantity,、For being
Number；As can be seen here, by adjustingWithJust can be adjusted flexiblyEnd active power output；In running process
In, traffic department can be according to the actual setting of exerting oneself of double-end feed, on the premise of eliminating inverse probability, consider two ends electricity
Source capacity, realizes the equalization that feeder line is exerted oneself as far as possible, to improve running efficiency of system.
Step 2: propose the optimal power flow control strategy minimum based on series compensating voltage；
Utilize THE UPFC that distribution power flow of ring net is controlled, distribution looped network power flow regulating is required and Unified Power Flow
Controller output voltage combines, and ensures the economy of THE UPFC on the premise of meeting power regulation requirements as far as possible
Property.THE UPFC realize principle as in figure 2 it is shown, its part in series output series compensating voltage, the nothing of control system
Merit and active power, the exchange of reactive power can complete self；Parallel connection part is as current source, and main balance dc bus is electric
Pressure, provides for part in series active power of output and supports.Compensate power one timing, on the premise of realizing compensating voltage minimum,
The coupling transformer of part in series can be saved, directly carry out series compensation, to ensure the economy of THE UPFC.
From the foregoing it will be appreciated thatEnd power adjustmentWithWithThere is relation:
In power adjustmentOne timing is equality constraint.Optimization aim isMinimum, usesRepresent.Then have:
WhereinFor Lagrange object function,For Lagrangian.
By,,Solve:
Considering static load voltage characteristic, correction further to optimizing control models obtains recurrence formula, it is assumed that static load electricity
Pressure characteristic coefficient is, then have:
WhereinFor the terminal voltage before regulation.
It should be understood that
A. this Controlling model is only with the single-end information amount of THE UPFC installation place, and data acquisition is convenient；
B. single-phase power flowcontrol when this model is applicable to power distribution network three-phase imbalance.
Step 3: build inequality constraints condition；
Described structure inequality constraints condition, under meeting power equation constraints, also needs to meet following inequality constraints
Condition:
Wherein,The each load bus voltage in position,、It is respectively load bus voltage bound；、It is respectively
End,The apparent energy of end output,、It is respectivelyEnd,The apparent energy limit of end output.
Under the conditions of the voltage constraint calculated according to above-mentioned steps and power output pole limit, segmentation adjusts result as shown in table 1 table 2
(wherein、、、Respectively flow through electric current and the power of THE UPFC).?End utilizes Unified Power Flow control
After device processed adjusts,Meritorious the exerting oneself of end is 1.641 MW,End is meritorious exerts oneself as 2.107MW, and power output in two ends obtains effectively
Equilibrium.?After utilizing THE UPFC to adjust,End is meritorious exerts oneself as 2.070MW,End is meritorious exert oneself into
1.722MW, power output in two ends obtains efficient balance.
Table 1 M side installing THE UPFC adjusts result
Table 2M side installing THE UPFC adjusts result
Table 2(continues) M side installing THE UPFC adjustment result
Above two simulation result shows, utilize THE UPFC no matter forward adjust meritorious exert oneself or reversely adjust have
Merit is exerted oneself, and all can meet power equalization in the case of voltage minimum and adjust target.Power adjusts and is respectively provided with higher regulation essence
Degree, it is contemplated that the undulatory property of actual load, this control accuracy disclosure satisfy that on-the-spot operation needs.This illustrates this optimizing control models
It is effective.
Power flow of ring net regulation is required to organically combine with THE UPFC output voltage by the present invention, ensures unified as far as possible
The economy of flow controller device.On the premise of meeting power flowcontrol requirement, establish string and mend the optimization control that voltage is minimum
Simulation, and obtained consider static load voltage characteristic tide optimization recursion Controlling model, establish variation and
Two ends power output pole limit constraints.This model is not only suitable for three-phase balanced system, is also applied for three-phase unbalance system
Single-phase trend independently controls.Simulation results show, the method can be it is anticipated that trend be controlled by target, and equalizing two ends has
Merit is exerted oneself；And Power Electronic Technique has obtained tremendous development at present, in this phantom, the voltage within 2000V can
To adjust the active power of 1MW, string can be mended coupling transformer the most completely and save, direct series compensation, thus change
It is apt to the economy of device.This model is not only suitable for three-phase balanced system, is also applied for the single-phase trend of three-phase unbalance system
Independent control.
The above is only the preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For Yuan, under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (4)
1. the dual power supply distribution looped network flow control method mending voltage minimum based on string, it is characterised in that comprise following step
Rapid:
Step one: structure dual power supply distribution looped network flow control method；
Step 2: propose the optimal power flow control strategy minimum based on series compensating voltage；
Step 3: build inequality constraints condition.
The dual power supply distribution looped network flow control method mending voltage minimum based on string the most according to claim 1, its feature
It is: the structure dual power supply distribution looped network flow control method in described step one is as follows,
Making the outfan in dual power supply distribution looped network is M, then the complex power of M end output is:
Wherein,For the summation of main feed looped network impedance,ForThe duty values such as the branched line,It isSection main feed looped network line
Roadlock resists,、It is respectivelyEnd withThe busbar voltage of end,For branch's number；
At one end (assuming thatEnd) inject series compensating voltage, then the complex power of this end output is:
When adjusting string and mending voltage, it is assumed that two ends busbar voltage is unaffected, from above formulaEnd series compensating voltage can be straight
Connect the output controlling this end complex power, it may be assumed that
End active power variable quantityWith series compensating voltageBetween relation be:
For convenience of representing, order:
Then have:
WhereinForVertical component,ForHorizontal component,ForEnd active power variable quantity,、For coefficient；
As can be seen here, by adjustingWithJust can be adjusted flexiblyEnd active power output.
The dual power supply distribution looped network flow control method mending voltage minimum based on string the most according to claim 1, its feature
It is: the optimal power flow control strategy based on series compensating voltage is minimum that proposes in described step 2 is to utilize Unified Power Flow
Distribution power flow of ring net is controlled by controller, is required and THE UPFC output voltage phase by distribution looped network power flow regulating
In conjunction with, on the premise of meeting power regulation requirements, ensure the economy of THE UPFC as far as possible；Wherein Unified Power Flow control
Its part in series of device processed output series compensating voltage, the idle and active power of control system, the exchange of reactive power self is i.e.
Can complete；Parallel connection part, as current source, mainly balances DC bus-bar voltage, provides for part in series active power of output and props up
Support；Compensate power one timing, on the premise of realizing compensating voltage minimum, the coupling transformer of part in series can be saved, directly
Carry out series compensation, to ensure the economy of THE UPFC；
From the foregoing it will be appreciated thatEnd power adjustmentWithWithThere is relation:
In power adjustmentOne timing is equality constraint；Optimization aim isMinimum, usesRepresent then have:
WhereinFor Lagrange object function,For Lagrangian；
By,,Solve:
Considering static load voltage characteristic, correction further to optimizing control models obtains recurrence formula, it is assumed that static load electricity
Pressure characteristic coefficient is, then have:
WhereinFor the terminal voltage before regulation.
The dual power supply distribution looped network flow control method mending voltage minimum based on string the most according to claim 1, its feature
Be: the structure inequality constraints condition in described step 3, under meeting power equation constraints, also need to meet following not
Equality constraint:
Wherein,The each load bus voltage in position,、It is respectively load bus voltage bound；、It is respectively
End,The apparent energy of end output,、It is respectivelyEnd,The apparent energy limit of end output.
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| WO2013126660A2 (en) * | 2012-02-24 | 2013-08-29 | Board Of Trustees Of Michigan State University | Transformer-less unified power flow controller |
| CN104298421A (en) * | 2014-06-23 | 2015-01-21 | 国家电网公司 | Power distribution network safety control method based on rapid simulation analysis technology |
| CN105119275A (en) * | 2015-08-18 | 2015-12-02 | 河海大学 | An algorithm for electric power system dynamic optimal power flows of a meter and a unified power flow controller |
-
2016
- 2016-09-22 CN CN201610839503.7A patent/CN106329533A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060229767A1 (en) * | 2005-04-08 | 2006-10-12 | Chang Gung University | Method for calculating power flow solution of a power transmission network that includes unified power flow controllers |
| WO2013126660A2 (en) * | 2012-02-24 | 2013-08-29 | Board Of Trustees Of Michigan State University | Transformer-less unified power flow controller |
| CN104298421A (en) * | 2014-06-23 | 2015-01-21 | 国家电网公司 | Power distribution network safety control method based on rapid simulation analysis technology |
| CN105119275A (en) * | 2015-08-18 | 2015-12-02 | 河海大学 | An algorithm for electric power system dynamic optimal power flows of a meter and a unified power flow controller |
Non-Patent Citations (1)
| Title |
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| 仉志华 等: "基于串补电压最小的双电源配电环网潮流优化控制方法", 《电力自动化设备》 * |
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Application publication date: 20170111 |