CN106602578B - A method of it improving power supply and sends type transmitting capacity of the electric wire netting outside - Google Patents
A method of it improving power supply and sends type transmitting capacity of the electric wire netting outside Download PDFInfo
- Publication number
- CN106602578B CN106602578B CN201611191950.2A CN201611191950A CN106602578B CN 106602578 B CN106602578 B CN 106602578B CN 201611191950 A CN201611191950 A CN 201611191950A CN 106602578 B CN106602578 B CN 106602578B
- Authority
- CN
- China
- Prior art keywords
- power
- route
- line
- voltage
- transmission line
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
-
- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
-
- 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
Abstract
A method of it improving power supply and sends type transmitting capacity of the electric wire netting outside, the present invention initially sets up the lossless model under the distribution parameter of long range high voltage overhead line, then exports the active and reactive relationship between route both end voltage, phase angle on transmission line of electricity route；Model is improved again, equivalent electromotive force is added in the sending end and receiving end of transmission line of electricity, it derives the relationship sent receiving-end system equivalence potential and transmission line of electricity voltage, send receiving end short-circuit ratio, obtain the power of system transmission and send receiving end equivalence electromotive force, phase angle difference, send receiving end short-circuit ratio, the relational expression of conveying distance；The power limit of transmission line of electricity actual fed is determined according to the value range of static stability reserve coefficient；Capacitive compensation is carried out to route, obtains the relational expression of compensated transmission power according to the parameter changed after compensation.The present invention has the exchange long range electric energy ability that improves, can determine the remarkable advantage for putting into the optimal series compensation degrees of fixed series compensation device on the route of somewhere.
Description
Technical field
The invention belongs to Operation Technique of Electric Systems field, specially a kind of raising power supply sends type transmitting capacity of the electric wire netting outside
Method.
Background technique
For long-distance transmission line, power transmission line reactance becomes the principal element of limitation route ability to transmit electricity, ability to transmit electricity
Depend primarily on the stability limit of route.The power-angle stability of synchronous generator limits transmission power, transmission distance distance
System, it is necessary to which capacitive compensation is taken to route.At present there is several methods that can be used to improve ability to transmit electricity: one, reinforce power grid construction,
Increase construction route, improve electric network composition.Two, controlled series compensation device is accessed in transmission line of electricity, this method is in a very wide range
It is interior can rapidly, continuously adjusting circuit reactance, the equivalent impedance of transmission line of electricity is effectively reduced, to improve system transmission
Power.Three, on the way or by electric terminals and static reactive generator or Static Var Compensator are connect in power transmission line, according to load need
It wants, dynamic regulation is idle, so that the influence of power transmission line inductive reactance be effectively reduced, while guaranteeing the stability of network system.With
All play the role of compensating conductance in the power system on upper three kinds of theoretical methods, but in practical projects, it is huge due to investing,
Cost performance is not high, does not use generally.Four, fixed series compensation device is put into.The influence of power transmission line inductive reactance can be effectively reduced in this method,
And it invests lower.
Summary of the invention
Present invention aims to solve the deficiencies of the prior art, and provides a kind of a kind of raising power supplys to send type transmitting capacity of the electric wire netting outside
Method, by putting into the capacitor of certain compensativity on the transmission line come the reactance of compensated line itself, to increase route
Transmission limit power.
The purpose of the present invention is achieved through the following technical solutions:
A method of it improving power supply and sends type transmitting capacity of the electric wire netting outside, steps are as follows:
Step 1: the lossless model under the distribution parameter of long range high pressure overhead power line is established:
In formula,For line characteristic impedance；For line propagation coefficient；z1、y1Respectively route
Impedance and admittance；U1、I1Respectively route beginning voltage and current；U2、I2Respectively line end voltage and current；L is route
Distance of the starting point to end；
Step 2: simplifying the model in step 1 and establishes voltage, current relationship under per unit value:
Since the resistance of supertension line is often far smaller than reactance, conductance then be can be ignored, so setting in route
Resistance r1=0, conductance g1=0；(1) formula is simplified, is obtained defeated as follows to the circuit voltage relationship under electric line per unit value:
In formula, β=ω/c is phase constant, and ω is angular frequency, and c is the light velocity；J is imaginary unit；u1、i1Respectively mark
Lower value is route beginning voltage and current；u2、i2It is line end voltage and current respectively under per unit value；
Step 3: computing electric power line active power and reactive power:
It can be obtained according to the relationship of power and voltage, electric current on formula (2) and route:
In formula, δ u1With u2Phase angle difference；p2、q2Line end active power and reactive power respectively under per unit value；
p1、q1Route beginning active power and reactive power respectively under per unit value；
Step 4: introducing virtual voltage source model under long transmission line overhead transmission line distributed parameter model, calculates active power:
In formula, SscsAnd SscrThe respectively capacity of short circuit of sending and receiving-end system,Point
Not Wei sending and receiving-end system short-circuit ratio, es, er, δsrRespectively sending equivalence electromotive force and receiving-end system are equivalent
Electromotive force and the phase angle difference of both, P0For the natural power of route；
Step 5: the power limit that can be transmitted on transmission line of electricity is determined；
Since the maximum transmission power on transmission line of electricity has system stability decision, the stability limitation of transmission system
Usually indicated with static stability reserve coefficient；Its value may be expressed as:
Therefore, when the value range of static reserve factor determines, so that it may obtain the power limit of transmission line of electricity conveying
With the relationship of transmission distance and short-circuit ratio；
Step 6: series capacitor compensation is carried out to route, and determines optimal compensation degree；
Assuming that compensativity is ksc, then the transmission power of route after compensating are as follows:
In formula,XCFor the capacitive reactance of series capacitor, XLFor line reactance,
The influence for thereby determining that compensativity system power line road maximum delivery power, determines optimal series compensation degrees.
The present invention is by initially setting up the lossless model under long range high pressure overhead power line distribution parameter, according to the mould
Type exports the active and reactive relationship between route both end voltage, phase angle on transmission line of electricity；Then model is improved,
Equivalent electromotive force is added in the sending end and receiving end of transmission line of electricity, and introduce sending and receiving-end system short-circuit ratio it is general
It reads, derives the relationship sent receiving-end system equivalence potential and transmission line of electricity voltage, send receiving end short-circuit ratio, system further can be obtained
The power of transmission with send receiving end equivalence electromotive force, phase angle difference, the relational expression for sending receiving end short-circuit ratio, conveying distance etc.；Due to transmission of electricity
The limiting value of transmission power is limited by system stability on route, therefore, can be according to the value of static stability reserve coefficient
Range determines the power limit of transmission line of electricity actual fed；Capacitive compensation is carried out to route as needed, can be caused after compensation
The change of line parameter circuit value, the relational expression according to the available compensated transmission power of parameter after changing；Finally according to system
The factors such as stability, voltage class, transmission distance determine optimal compensation degree.
The method that the present invention takes is to improve the effective measures of exchange long range electric energy ability.This method can determine somewhere
The optimal compensation degree of fixed series compensation device is put on area's route, and since it is with good economy, so having preferable
Application prospect.
Detailed description of the invention
Fig. 1 is the schematic illustration of the method for the present invention；
Fig. 2 is distributed parameter model figure under long transmission line；
Fig. 3 is that virtual voltage source model figure is added in Fig. 2 model；
Fig. 4 is Yunnan Nujiang electric network composition；
Fig. 5 is that Fugong-Jianchuan 220KV route adds string to mend front and back transmission power variation；
Fig. 6 is that-Lan Ping 220KV route in Fugong adds string to mend front and back transmission power variation.
Specific embodiment
As shown in Figure 1, the method for the present invention for improving power supply and sending type transmitting capacity of the electric wire netting outside, the specific steps are as follows:
Step 1: voltage, the current relationship under long transmission line overhead transmission line distributed parameter model are established, to long transmission line overhead line
Road is modeled, model such as Fig. 2, and the voltage relationship on transmission line of electricity is as follows:
In formula (1),For line characteristic impedance；For line propagation coefficient；z1、y1Respectively
Line impedance and admittance；U1、I1Respectively route beginning voltage and current；U2、I2Respectively line end voltage and current；L is
Distance of the route starting point to end；
Step 2: simplifying the model in step 1 and establishes voltage, current relationship under per unit value:
Since the resistance of supertension line is often far smaller than reactance, conductance then be can be ignored, so route can be set
In resistance r1=0, conductance g1=0；The characteristic impedance of route and propagation coefficient will be respectively provided with following form:
L in formula1For the inductance of route, C1For the capacitor of route；ω is angular frequency, and j is imaginary unit；
(1) formula formula can be simplified；The voltage rating on line taking road and natural power are as voltage base value and function respectively
Rate base value, that is, take Vβ=Vrated,The circuit voltage relationship that can be obtained under transmission line of electricity per unit value is as follows:
In formula (2), β=ω/c is phase constant, and ω is angular frequency, and c is the light velocity；u1、i1It is line respectively under per unit value
Road beginning voltage and current；u2、i2It Wei be not line end voltage and current under per unit value；
Step 3: computing electric power line active power and reactive power:
Since line end electric current, voltage and power have following relationship:
(3) formula is brought into (2) Shi Ke get:
If δ is u1With u2Phase angle difference, take u2For reference axis, then u1It can also be expressed as following form:
u1=u1cosδ+j·u1sinδ (5)
It is as follows that the active and idle a reference value on route can be obtained according to the corresponding relationship of (4) formula and (5) formula:
It can similarly obtain:
In formula, p2, q2Line end active power and reactive power respectively under per unit value；p1, q1Respectively under per unit value
Route beginning active power and reactive power；
Step 4: introducing virtual voltage source model under long transmission line overhead transmission line distributed parameter model, calculates active power:
Virtual voltage source is added to Fig. 2 institute's representation model, obtains model as shown in Figure 3；
If the capacity of short circuit of sending and receiving-end system is respectively SscsAnd Sscr, the short circuit of sending and receiving-end system
Than being respectively as follows:
Referring to Fig. 3, with u2For reference axis, it can be deduced that sending equivalence potential and phase angle are respectively as follows:
Receiving-end system equivalence potential and phase angle are respectively as follows:
Send the phase angle of receiving-end system are as follows:
In formula, es, δsRespectively sending end equivalence potential and phase angle；er, δrRespectively receiving end equivalence potential and phase angle；
δsrFor the phase angle difference for sending receiving end；
(7) formula, (9) formula substitute into (10) formula, (12) formula obtains:
Due toCompared to usIt is smaller to can be ignored, it can obtain:
(14) formula, (17) formula, (18) formula, which are substituted into (6) formula and carry out simplification, can obtain transmission power formula on transmission line of electricity:
In formula,The respectively capacity of short circuit of sending and receiving-end system；es, er, δsrPoint
It Wei not sending equivalence electromotive force and receiving-end system equivalence electromotive force and the phase angle difference of both；
Step 5: the power limit that can be transmitted on transmission line of electricity is determined:
Since the maximum transmission power on transmission line of electricity has system stability decision, the stability limitation of transmission system
Usually indicated with static stability reserve coefficient；Its value may be expressed as:
Therefore, when the value range of static reserve factor determines, so that it may obtain the power limit of transmission line of electricity conveying
With the relationship of transmission distance and short-circuit ratio；
Step 6: series capacitor compensation is carried out to route, and determines optimal compensation degree:
Assuming that compensativity is ksc, then the transmission power of route after compensating are as follows:
In formula,XCFor the capacitive reactance of series capacitor, XLFor line reactance,
It is possible thereby to determine the influence of compensativity system power line road maximum delivery power；Due to series compensation degrees mistake to be considered
When height will lead to resonance and lead to generator external reactance in capacitive, the warp of self-excitation magnetic phenomenon problem, series compensation device easily occurs
The factors such as Ji property, actual track voltage class, transmission line length can determine that optimal string is mended according to the weight specific gravity of various situations
Degree.
When will lead to resonance since series compensation degrees to be considered are excessively high and leading to generator external reactance in capacitive, easily occur
The factors such as self-excitation magnetic phenomenon problem, the economy of series compensation device, actual track voltage class, transmission line length, can be according to each
The weight specific gravity of kind situation determines optimal series compensation degrees.
It applies the inventive method in the power grid actual electric network structure of Yunnan Nujiang, achieves preferable effect.
According to Yunnan Nujiang power grid 220KV exchange section send outside the limit data and analysis shows, existing electric network composition
Have been unable to meet the demand that transmission line of electricity over the next several years sends power and power grid large size power supply booting plan in future outside.Therefore it needs
Improve the conveying capacity of Yunnan Nujiang power grid section.Extract existing data, process calculation shows that Yunnan Nujiang power grid Fugong
Section sending electrode is limited to 360MW to the north of change；Section sending electrode is limited to 700MW on the south the change of Fugong.
Using Nujiang power grid as model, model such as Fig. 4.
Case 1
Ability to transmit electricity is improved to the Fugong 220KV~Jianchuan line series capacitor compensation to analyze.Pass through PSD electric system point
Analysis software is emulated, and is had respectively to what can be transmitted on the route of (compensativity 40%) before compensating on the route and after compensation
Function power and reactive power auxiliary service are compared, and as seen in Figure 5, the power limit that compensated route can transmit is
Originally 1.4 times.By following table 1 it can also be seen that compensated reactive loss also declines original 1/2 accordingly, this
It is good to the quality of voltage of route.
1. Fugongs of table-Jianchuan 220KV route adds string to mend front and back power
| Before string is mended (MW) | After string is mended (MW) | |
| Active loss P2 | 1.248 | 8.07 |
| Reactive loss Q2 | 21.78 | 10.19 |
| Charge power Q3 | 14.385 | 11.944 |
Case 2
Ability to transmit electricity is improved to the Fugong 220KV~orchid level ground line series capacitor compensation to analyze.Pass through PSD electric system point
Analysis software is emulated, and is had respectively to what can be transmitted on the route of (compensativity 50%) before compensating on the route and after compensation
Function power and reactive power auxiliary service are compared, as seen in Figure 6, in the power limit that compensated route can transmit
It is upgraded to original 1.6 times.By following table 2 it can also be seen that compensated reactive loss also fall to accordingly it is original
2/3, this is good to the quality of voltage of route
2 Fugong-Lan Ping 220KV route of table adds string to mend front and back power contrast
| Before string is mended (MW) | After string is mended (MW) | |
| Active loss P2’ | 0.813 | 2.26 |
| Reactive loss Q2’ | 24.39 | 16.87 |
| Charge power Q3’ | 14.622 | 11.632 |
Claims (1)
1. a kind of method for improving power supply and sending type transmitting capacity of the electric wire netting outside, which is characterized in that steps are as follows:
Step 1: the lossless model under the distribution parameter of long range high pressure overhead power line is established:
In formula,For line characteristic impedance；For line propagation coefficient；z1、y1Respectively line impedance
And admittance；U1、I1Respectively route beginning voltage and current；U2、I2Respectively line end voltage and current；L is route starting
Hold the distance to end；
Step 2: simplifying the model in step 1 and establishes voltage, current relationship under per unit value:
Since the resistance of supertension line is often far smaller than reactance, conductance then be can be ignored, so setting the electricity in route
Hinder r1=0, conductance g1=0；(1) formula is simplified, is obtained defeated as follows to the circuit voltage relationship under electric line per unit value:
In formula, β=ω/c is phase constant, and ω is angular frequency, and c is the light velocity；J is imaginary unit；u1、i1Respectively under per unit value
For route beginning voltage and current；u2、i2It is line end voltage and current respectively under per unit value；
Step 3: computing electric power line active power and reactive power:
It can be obtained according to the relationship of power and voltage, electric current on formula (2) and route:
In formula, δ u1With u2Phase angle difference；p2、q2Line end active power and reactive power respectively under per unit value；p1、q1
Route beginning active power and reactive power respectively under per unit value；
Step 4: introducing virtual voltage source model under long transmission line overhead transmission line distributed parameter model, calculates active power:
In formula, SscsAnd SscrThe respectively capacity of short circuit of sending and receiving-end system,Respectively
The short-circuit ratio of sending and receiving-end system, es, er, δsrRespectively sending equivalence electromotive force and receiving-end system equivalence is electronic
Gesture and the phase angle difference of both, P0For the natural power of route；
Step 5: the power limit that can be transmitted on transmission line of electricity is determined；
Since the power limit on transmission line of electricity is determined by system stability, the stability of transmission system is limited usually with quiet
State storage of stability indicates；Its value may be expressed as:
Therefore, when the value range of static reserve factor determines, so that it may obtain transmission line of electricity conveying power limit with it is defeated
The relationship of electrical distance and short-circuit ratio；
Step 6: series capacitor compensation is carried out to route, and determines optimal series compensation degrees；
Assuming that series compensation degrees are ksc, then the transmission power of route after compensating are as follows:
In formula,XCFor the capacitive reactance of series capacitor, XLFor line reactance,
The influence for thereby determining that series compensation degrees system power line road power limit, determines optimal series compensation degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611191950.2A CN106602578B (en) | 2016-12-21 | 2016-12-21 | A method of it improving power supply and sends type transmitting capacity of the electric wire netting outside |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611191950.2A CN106602578B (en) | 2016-12-21 | 2016-12-21 | A method of it improving power supply and sends type transmitting capacity of the electric wire netting outside |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106602578A CN106602578A (en) | 2017-04-26 |
| CN106602578B true CN106602578B (en) | 2019-02-22 |
Family
ID=58600398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611191950.2A Active CN106602578B (en) | 2016-12-21 | 2016-12-21 | A method of it improving power supply and sends type transmitting capacity of the electric wire netting outside |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106602578B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109031000B (en) * | 2018-08-03 | 2019-08-16 | 贵州电网有限责任公司电网规划研究中心 | A kind of method and system based on non-faulting disturbance In situ Measurement grid short circuit capacity |
| CN108896852B (en) * | 2018-08-03 | 2020-08-04 | 贵州电网有限责任公司电网规划研究中心 | Online measurement method and system for short circuit capacity of public access point |
| CN112467880B (en) * | 2020-11-19 | 2023-01-31 | 西安热工研究院有限公司 | Device and method for limiting maximum boost of head end of black-start sending-out line |
| CN114188937A (en) * | 2021-11-16 | 2022-03-15 | 国网青海省电力公司果洛供电公司 | Distribution line self-adaptive impedance matching method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2418079B (en) * | 2004-09-10 | 2007-12-12 | Areva T & D Uk Ltd | Convertible high voltage direct current installation |
| CN102904242B (en) * | 2012-10-25 | 2015-04-15 | 华北电力大学 | Method for improving stability of doubly-indeed DC system |
| JP6253258B2 (en) * | 2013-05-24 | 2017-12-27 | 株式会社東芝 | Power converter |
-
2016
- 2016-12-21 CN CN201611191950.2A patent/CN106602578B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN106602578A (en) | 2017-04-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106602578B (en) | A method of it improving power supply and sends type transmitting capacity of the electric wire netting outside | |
| CN107017646B (en) | Doubly-fed fan subsynchronous oscillation suppression method based on virtual impedance control | |
| CN111799813B (en) | Marine wind farm reactive power optimization configuration method considering reactive power regulation of wind turbine generator | |
| CN104868500A (en) | Method for parallel operation control suitable to be used for microgrid inverter | |
| CN100550568C (en) | Harmonic wave dynamic managing and reactive-load dynamic compensation compound control method and implement device thereof | |
| CN103515967B (en) | The collocation method of Reactive Compensation in Wind Farm | |
| CN102025152B (en) | Electric energy quality evaluation method of electrified railway accessed power system | |
| Saha et al. | Performance analysis and comparison of various FACTS devices in power system | |
| CN106549402B (en) | The method of TCSC inhibition AC/DC parallel operating system sub-synchronous oscillation | |
| CN104113059A (en) | Node current injection method-based modeling method of unified power flow controller | |
| CN104538988B (en) | Voltage stability regulating system for distributed power connection and control method thereof | |
| CN106410817B (en) | A kind of tractive power supply system negative phase-sequence is idle and voltage fluctuation complex optimum compensation method | |
| WO2022068146A1 (en) | Method for controlling micro-grid grid-connected inverter using dynamic droop coefficient | |
| CN106602576B (en) | Voltage powerless control system and control method based on static reactive voltage compensation | |
| CN108306334A (en) | Idle work optimization strategy inside wind power plant based on particle swarm optimization algorithm | |
| CN102496940B (en) | Method and device for cable current-carrying capacity reactive compensation | |
| CN105071397B (en) | The coordination reactive voltage control method for the polymorphic type reactive-load compensation equipment that wind-powered electricity generation is sent outside | |
| CN102231572A (en) | Method and system for power supply by extracting energy from ultrahigh voltage and extra-high voltage alternating current transmission lines | |
| CN112039105A (en) | Alternating current power grid frequency oscillation suppression method for high-voltage direct current transmission line interconnection | |
| CN104377711B (en) | A kind of dynamic reactive compensating method | |
| CN105790284A (en) | Reactive compensation control system and reactive compensation control method based on fuzzy control | |
| CN102055197B (en) | Method for establishing controllable serial compensation linearized model | |
| CN103036235B (en) | Electric railway electricity quality comprehensive treatment method based on electricity analysis program (ETAP) | |
| CN107039988A (en) | AC distribution net series compensation device adaptability teaching and Optimal Configuration Method | |
| CN112186816A (en) | Method for improving dynamic performance of photovoltaic microgrid by using novel droop reactive compensation control |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |