CN101325324B - Anti-icing method for overhead wire based on real time operation mode - Google Patents
Anti-icing method for overhead wire based on real time operation mode Download PDFInfo
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- CN101325324B CN101325324B CN2008101039516A CN200810103951A CN101325324B CN 101325324 B CN101325324 B CN 101325324B CN 2008101039516 A CN2008101039516 A CN 2008101039516A CN 200810103951 A CN200810103951 A CN 200810103951A CN 101325324 B CN101325324 B CN 101325324B
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- 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
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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- 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
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
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- Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
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Abstract
The invention relates to a deicing method for an aerial line, which is based on a real-time running mode, and belongs to the automation field of electric power system management. The method comprises the following steps: an electric network power management system is utilized to collect the running states of the electric power system on a real-time basis, and the real-time network topology and real-time current of the power system are obtained through state estimation; on the premise that the system dynamic stability is guaranteed, the power transmission of the line at high icing risk is increased according to the icing condition of the aerial line, so as to utilizing the resistance of the line to produce more heat and thaw ice or prevent the line from icing. The deicing method utilizes the electric network management automation system without the need or with little need of few apparatuses, the cost is low, and the implementation is convenient.
Description
Technical field
The invention belongs to the dispatching automation of electric power systems technical field, relate to a kind of anti-icing method for overhead wire based on real time operation mode.
Background technology
Occurred in the large tracts of land ice damage accident of southern china in 2008 around the Spring Festival, be because on a large scale, high strength, for a long time low temperature, sleet and freezing weather cause a large amount of icing of overhead wire of electrical network, thereby increased the tension force of lead greatly, striden electric force pole tower or rupture of line thereby draw.Because overhead wire is an electric energy transmitting, therefore in transmission, can produce heat.Caloric value when the overhead wire temperature depends on the link tester overcurrent, and under the certain situation of overhead wire resistance, square being directly proportional of overhead wire caloric value and overhead wire electric current.If the transmission current of icing the overhead wire that has a big risk is coagulated in increase, improve the caloric value of these overhead wires, can promote the line temperature of these overhead wires, thus the risk that reduces or avoid overhead wire to ice with fixed attention.
Yet overhead wire increases the dynamic stability level that transmission current may reduce electrical network, if blindly increase the transmission current of overhead wire, will have the danger of system's unstability.Therefore, need a kind of method of research, utilize EMS, under the situation that guarantees power grid security, increase the caloric value of circuit, reduce or avoid circuit to coagulate ice by the real time operation mode that changes electrical network.
EMS (EMS, Energy Management System) is the real-time monitoring of computer and the aid decision-making system of modern power network control centre.Its principle is to utilize high-speed communication network to gather the real-time power network service data, set up the Mathematical Modeling of electrical network, carrying out Generation Control and electric network swim calculates, carrying out power grid security analysis and control decision calculates, utilize result of calculation auxiliary dispatching person decision-making, perhaps directly electrical network is implemented closed-loop control, reach the purpose of power grid security economical operation.
Summary of the invention
The objective of the invention is for solving the ice problem that coagulates of overhead wire, a kind of anti-icing method for overhead wire based on real time operation mode is proposed, utilize energy management system, calculate the safety and stability level of electrical network in real time, under the prerequisite that guarantees electricity net safety stable, by changing the real time operation mode of electrical network, increase and coagulate the through-put power of icing the overhead wire that has a big risk, thereby increase the ice that coagulates that its caloric value reduces or avoid overhead wire.
Be institute's purpose on reaching, method of the present invention may further comprise the steps:
1), determines to want the line set of ice-melt according to the result who coagulates the ice condition condition who ices online observation with fixed attention;
2) utilize the tidal current analysis instrument of energy management system that the overhead wire of wanting ice-melt is selected new power system operating mode respectively according to power network topology and circuit model, in order to adjust former power system operating mode, to increase the transmission current of the overhead wire of wanting ice-melt, concrete adjustment strategy is as follows:
(1) on-load voltage regulation transformer separately makes generation circulation in the electromagnetic looped network in this electromagnetic looped network if the overhead wire of wanting ice-melt in electromagnetic looped network, then utilizes;
(2) if wanting the overhead wire of ice-melt is double loop, then two circuits are inserted different buses at supply side, utilize transformer, shunt reactor, shunt capacitor to make two buses produce voltage difference, in double loop, produce circulation;
(3) be single loop line of bundle conductor if want the circuit model of the overhead wire of ice-melt, then these two bundle conductors are inserted different buses at supply side, utilize transformer, series reactor, series capacitor to make two buses produce voltage difference, in two leads, produce circulation;
(4), then, make it to increase idle transmission at user side installing shunt reactor or shunt capacitor if wanting the overhead wire of ice-melt is single loop line solid conductor;
(5) if want the overhead wire of ice-melt to belong to a trend section, then stop the part circuit in turn, strengthen the power delivery of All other routes;
(6) distribute by regulating different generator outputs and voltage, the transmission current of overhead wire that must ice-melt is increased;
(7) by transfer load, the transmission of electricity path of change of load increases the electric current on must the overhead wire of ice-melt;
(8) if the direct current high tension transmission line, then adopt brownout operation, with bipolar symmetrical operation change in turn bipolar asymmetric or one pole operating multiple or any one, increase current in wire and heating;
3) in deicing processes, utilize online dynamic security analysis program assessment electrical network this moment whether to satisfy the transient stability constraint; If satisfy then set by step 2) in scheduling strategy carry out, if do not satisfy, then revise as follows to described scheduling strategy:
(1) adopts based on the transient stability nargin of transient energy function (TEF) distribution of generator output is readjusted in the sensitivity of each generator output, improve the transient stability level of electrical network; If also do not satisfy the transient stability constraint, then carry out next step;
(2) traversal step 2) in all scheduling strategies, cancellation strategy is one by one adjusted the operational mode of electric network model then, carries out the transient stability of emulation assessment electrical network, till electrical network satisfies scleronomic constraint.
Characteristics of the present invention:
At first the present invention can produce the characteristics of heat according to the overhead wire through-put power, utilize energy management system to obtain the actual operating of electrical network, utilize the tidal current analysis instrument of energy management system to select the feasible circuit of ice-melt that needs of scheme of adjustment operational mode to increase transmission current then, strengthen caloric value.Utilize the online dynamic security analysis software of energy management system simultaneously, calculate the dynamic security level of electrical network in real time, the system of assurance satisfies the transient stability constraint, avoids taking place in the deicing processes the destructive accident of electrical network.
Above characteristics make the inventive method have following advantage:
Make full use of the operation characteristic and the energy management system of electrical network self, by changing the method anti-freezing ice of real time operation mode, it is convenient to implement, small investment.
Description of drawings
Fig. 1 shows an electromagnetic looped network in the electrical network;
Fig. 2 shows to have two transforming plant primary winding diagrams that return outlet;
Fig. 3 shows the transformer station that contains single back line;
Fig. 4 shows contact service area and is subjected to the interconnection section in electricity district.
Embodiment
The present invention proposes to be described in detail as follows in conjunction with the embodiments based on the anti-icing method for overhead wire of real time operation mode:
This implementation method is to utilize the energy management system that is installed in grid dispatching center, and electrical network is carried out real time monitoring, security evaluation; Satisfy in the system of assurance under the prerequisite of transient stability constraint,, increase the transmission current that coagulates the ice shelf ceases to be busy, strengthen caloric value by adjusting operational mode; This method may further comprise the steps:
According to geographical position, the outside weather of overhead wire and the result who coagulates the ice condition condition who ices on-line monitoring system or artificial observation with fixed attention, form the overhead wire line set that needs ice-melt.
Step 2, formation change the scheduling strategy of operation of power networks, need the transmission current and the duration of the circuit of ice-melt with increase:
Utilize automation system for the power network dispatching, obtain the model parameter of real-time power network data and grid equipment, utilize method for estimating state to generate the electric network swim parameter automatically.
Utilize the tidal current analysis instrument of energy management system to select to adjust the scheme of operational mode according to power network topology and circuit model, adopt corresponding scheme to change system operation mode then, need the transmission current of the circuit of ice-melt with increase: concrete adjustment strategy is as follows:
1, on-load voltage regulation transformer separately makes generation circulation in the electromagnetic looped network in this electromagnetic looped network if the overhead wire of wanting ice-melt in electromagnetic looped network, then utilizes; For example, as shown in Figure 1, can be by adjusting the tap gear of transformer 12, make to produce bigger circulation on the circuit 11, thereby increase the transmission current on the circuit.
2, if wanting the overhead wire of ice-melt is double loop, then can two circuits be inserted different buses at supply side, utilize transformer, shunt reactor, shunt capacitor to make two buses produce voltage difference, in double loop, produce circulation.For example, as shown in Figure 2, open 220kV bar coupler 22, the 110kV bar coupler 23 that closes is adjusted transformer 24 gears then, thereby changes two electric currents that return in the outlet 21.
3, be single loop line of bundle conductor if want the circuit model of the overhead wire of ice-melt, then these two bundle conductors are inserted different buses at supply side, utilize transformer, series reactor, series capacitor to make two buses produce voltage difference, in two leads, produce circulation;
4,, then, make it to increase idle transmission at user side installing shunt reactor or shunt capacitor if wanting the overhead wire of ice-melt is single loop line solid conductor; For example, as Fig. 3, by Closing Switch 32, reactor 33 in the throwing, can strengthen as idle on single time overhead wire 31, thereby increase transmission current.
5, if want the overhead wire of ice-melt to belong to a trend section, then stop the part circuit in turn, strengthen the power delivery of All other routes; For example, as shown in Figure 4,, can strengthen the power delivery of All other routes by cut-offfing part interconnection 41 in turn.
6, distribute by regulating different generator outputs and voltage, the transmission current of overhead wire that must ice-melt is increased;
7, by transfer load, the transmission of electricity path of change of load increases the electric current on must the overhead wire of ice-melt;
If 8 direct current high tension transmission lines, then adopt brownout operation, with bipolar symmetrical operation change in turn bipolar asymmetric or one pole operating multiple or any one, increase current in wire and heating;
Step 3, analog computation scheduling strategy are executed the power system operating mode after the effect, the dynamic security of assessment electrical network.
Scheduling strategy in step 2 is affacted in the electric network model, utilize online dynamic security analysis program assessment electrical network this moment whether to satisfy the transient stability constraint.The transient stability constraint is meant at transient state fault collection F
TIn under the situation that arbitrarily fault takes place, the transient state unstability does not take place in system.Concrete grammar have a learned dissertation published (Guo Qi, Zhang Baiming, Wang Shouxiang. based on the dynamic security analysis system of EMS. Automation of Electric Systems, 2004,28 (8): 57-62)
Step 4, according to the assessment result of previous step, revise scheduling strategy
If find in the previous step assessment, if electrical network satisfies the transient stability constraint, then the scheduling strategy in two carries out ice-melt set by step, and real-time tracking calculates the transient stability level of electrical network, finishes up to ice-melt; If electrical network can not satisfy the transient stability constraint, can handle in two steps so:
(1) distribution of adjustment generator output, the transient stability level of raising system
Because generator self parameter, in electrical network the difference of position and running status, to fault f ∈ F
T, different generator growth pattern is different to the influence of the transient stability nargin of system.The present invention adopts based on the transient stability nargin of transient energy function (TEF) distributions of exerting oneself of generator is readjusted in the sensitivity of each generator output, with the transient stability level of raising system.
Transient stability nargin in the TEF method can be expressed as:
ΔV＝V
U-V
cl
In the formula, V
UBe the transient state energy at unstable equilibrium point place, V
ClThe transient state energy of etching system correspondence during for failure removal, promptly the lasting track of fault is V in failure removal corresponding constantly kinetic energy and potential energy sum
Cl
For a certain fault f, following formula can write out detailed analytical expression, can analyze the sensitivity of each generator injecting power variation to system stability nargin on the expression formula basis:
Wherein, P
MiBe exerting oneself of i platform generator, M
F, iExpression is for fault f, and i platform generator power increases the sensitivity to the stability margin of system.
TEF method and Sensitivity calculation thereof can be referring to pertinent literature (Pai M A.Energy Function Analysis forPower System Stability[M] .Boston, MA, USA:Kluwer Academic Publishers, 1989).It may be noted that M
F, iSymbol when increasing for just representing power, system stability nargin increases; Otherwise then power increases, and nargin reduces.
Can be according to sensitivity M
F, iSize, utilize to increase M
F, iThe processing of big generator reduces M simultaneously
F, iLittle generator output is in the transient stability nargin that keeps sending out for improving system under the prerequisite of balance.
After exerting oneself by regulator generator, system still can not satisfy the transient stability constraint, then enters next step adjustment.
(2) cancellation part scheduling strategy, the transient stability level of raising system
Travel through all scheduling strategies, cancellation is tactful one by one, and the operational mode of adjustment model is carried out emulation assessment power systems, till scleronomic constraint is satisfied in electric power system then.Then, remaining scheduling strategy is affacted actual electric network carry out ice-melt, and the transient stability level of real-time tracking calculating electrical network, finish up to ice-melt.
Claims (1)
1. the anti-icing method for overhead wire based on real time operation mode is characterized in that, utilizes the energy management system that is installed in grid dispatching center, and electrical network is carried out real time monitoring, security evaluation; Satisfy in the system of assurance under the prerequisite of transient stability constraint,, increase the transmission current that coagulates the ice shelf ceases to be busy, strengthen caloric value by adjusting operational mode;
This method may further comprise the steps:
1), determines to want the overhead wire line set of ice-melt according to the result who coagulates the ice condition condition who ices online observation with fixed attention;
2) utilize the tidal current analysis instrument of energy management system that the overhead wire of wanting ice-melt is selected new power system operating mode respectively according to power network topology and circuit model, in order to adjust former power system operating mode, to increase the transmission current of the overhead wire of wanting ice-melt, concrete adjustment strategy is as follows:
(1) on-load voltage regulation transformer separately makes generation circulation in the electromagnetic looped network in this electromagnetic looped network if the overhead wire of wanting ice-melt in electromagnetic looped network, then utilizes;
(2) if wanting the overhead wire of ice-melt is double loop, then two circuits are inserted different buses at supply side, utilize transformer, shunt reactor, shunt capacitor to make two buses produce voltage difference, in double loop, produce circulation;
(3) be single loop line of bundle conductor if want the circuit model of the overhead wire of ice-melt, then these two bundle conductors are inserted different buses at supply side, utilize transformer, series reactor, series capacitor to make two buses produce voltage difference, in two leads, produce circulation;
(4), then, make it to increase idle transmission at user side installing shunt reactor or shunt capacitor if wanting the overhead wire of ice-melt is single loop line solid conductor;
(5) if want the overhead wire of ice-melt to belong to a trend section, then stop the part circuit in turn, strengthen the power delivery of All other routes;
(6) distribute by regulating different generator outputs and voltage, the transmission current of overhead wire that must ice-melt is increased;
(7) by transfer load, the transmission of electricity path of change of load increases the electric current on must the overhead wire of ice-melt;
(8) if the direct current high tension transmission line, then adopt brownout operation, with bipolar symmetrical operation change in turn bipolar asymmetric or one pole operating multiple or any one, increase current in wire and heating;
3) in deicing processes, utilize online dynamic security analysis program assessment electrical network this moment whether to satisfy the transient stability constraint; If satisfy then set by step 2) in scheduling strategy carry out, if do not satisfy, then revise as follows to described scheduling strategy:
(1) adopts based on the transient stability nargin of transient energy function TEF the distribution of generator output is readjusted in the sensitivity of each generator output, improve the transient stability level of electrical network; If also do not satisfy the transient stability constraint, then carry out next step;
(2) traversal step 2) in all scheduling strategies, cancellation strategy is one by one adjusted the operational mode of electric network model then, carries out the transient stability of emulation assessment electrical network, till electrical network satisfies scleronomic constraint.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013141952A3 (en) * | 2012-03-20 | 2013-11-14 | The Boeing Company | Methods and apparatus for anti-icing and deicing power transmissions lines |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101656407B (en) * | 2009-08-18 | 2011-11-09 | 国家电网公司 | Method and device for preventing ice coating in electric transmission line |
| CN103616099A (en) * | 2013-11-25 | 2014-03-05 | 国家电网公司 | Method for detecting optical fiber composite ground wire icing frequency-domain analysis state of electric transmission line |
| CN105656028B (en) * | 2016-01-20 | 2019-04-30 | 国网河北省电力公司电力科学研究院 | A kind of visual display method of the stabilization of power grids nargin based on GIS |
| CN105656042B (en) * | 2016-03-25 | 2019-03-01 | 江苏省电力公司 | The canonical form appraisal procedure of reciprocal effect between a kind of UPFC controller |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013141952A3 (en) * | 2012-03-20 | 2013-11-14 | The Boeing Company | Methods and apparatus for anti-icing and deicing power transmissions lines |
| US9048649B2 (en) | 2012-03-20 | 2015-06-02 | The Boeing Company | Method and apparatus for anti-icing and deicing power transmission lines |
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